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<h2 title="Class Query" class="title">Class Query</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
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<ul class="inheritance">
<li>org.jpl7.Query</li>
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<dt>All Implemented Interfaces:</dt>
<dd>java.lang.Iterable<java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>>, java.util.Iterator<java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>></dd>
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<pre>public class <span class="typeNameLabel">Query</span>
extends java.lang.Object
implements java.lang.Iterable<java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>>, java.util.Iterator<java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>></pre>
<div class="block">A Query instance is created by an application in order to query the Prolog
database (or to invoke a built-in predicate). It is initialised with a
Compound (or Atom) denoting the goal which is to be called, and also contains
assorted private state relating to solutions. In some future version, it may
contain details of the module in which the goal is to be called.
<p>
A Query is either open or closed: when closed, it has no connection to the
Prolog system; when open, it is linked to an active goal within a Prolog
engine.
<p>
The Query class implements the Enumeration interface, through which one can
obtain successive solutions. The Enumeration hasMoreElements() method returns
true if the call or redo succeeded (otherwise false), and if the call or redo
did succeed, the nextElement() method returns a Map representing variable
bindings; the elements in the Map are Terms, indexed by the (String) names of
the Variables with which they are associated. For example, if <i>p(a)</i> and
<i>p(b)</i> are facts in the Prolog database, then the following is
equivalent to printing all the solutions to the Prolog query <i>p(X)</i>:
<pre>
Variable X = new Variable("X");
Term arg[] = { X };
Query q = new Query("p", arg);
while (q.hasMoreElements()) {
Term bound_to_x = ((Map) q.nextElement()).get("X");
System.out.println(bound_to_x);
}
</pre>
Make sure to close the Query (using the close() method) if you do not need
any further solutions which it may have. It is safe (although redundant) to
close a Query whose solutions are already exhausted, or which is already
closed.
To obtain just one solution from a Query, use the oneSolution() method.
To obtain all solutions, use the allSolutions() method.
To obtain at most N solutions, use the nSolutions() method.
To determine merely whether the Query is provable, use the hasSolution()
method (i.e. has at least one solution).
<hr>
Copyright (C) 2007 Paul Singleton
<p>
Copyright (C) 1998 Fred Dushin
<p>
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
<ol>
<li>Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
<li>Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
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<caption><span>Fields</span><span class="tabEnd"> </span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
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<tr class="altColor">
<td class="colFirst"><code>protected java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#contextModule">contextModule</a></span></code> </td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected <a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#goal_">goal_</a></span></code>
<div class="block">the Compound or Atom (but not Dict, Float, Integer or Variable)
corresponding to the goal of this Query</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#hostModule">hostModule</a></span></code> </td>
</tr>
</table>
</li>
</ul>
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<h3>Constructor Summary</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation">
<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#Query-java.lang.String-">Query</a></span>(java.lang.String text)</code>
<div class="block">This constructor builds a Query from the given Prolog source text, "as is".</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#Query-java.lang.String-org.jpl7.Term-">Query</a></span>(java.lang.String text,
<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a> arg)</code> </td>
</tr>
<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#Query-java.lang.String-org.jpl7.Term:A-">Query</a></span>(java.lang.String text,
<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>[] args)</code>
<div class="block">If text denotes an atom, this constructor is shorthand for
new Query(new Compound(name,args)).</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#Query-org.jpl7.Term-">Query</a></span>(<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a> t)</code>
<div class="block">This constructor creates a Query whose goal is the specified Term.</div>
</td>
</tr>
</table>
</li>
</ul>
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<h3>Method Summary</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span><span id="t6" class="tableTab"><span><a href="javascript:show(32);">Deprecated Methods</a></span><span class="tabEnd"> </span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code>java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#allSolutions--">allSolutions</a></span>()</code>
<div class="block">calls the Query's goal to exhaustion and returns an array of zero or more
Maps of zero or more variablename-to-term bindings (each Map represents a
solution, in the order in which they were found).</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>static java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#allSolutions-java.lang.String-">allSolutions</a></span>(java.lang.String text)</code>
<div class="block">This static method creates a Query from the given Prolog source text
fragment, calls it to exhaustion, and returns an array of zero or more
Maps of zero or more variablename-to-term bindings (each Map represents a
solution, in the order in which they were found).</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>static java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#allSolutions-java.lang.String-org.jpl7.Term:A-">allSolutions</a></span>(java.lang.String text,
<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>[] params)</code>
<div class="block">If text denotes (in traditional Prolog source syntax) a term containing N
questionmark (?) symbols and there are N accompanying Term params, this
static method replaces each questionmark symbol by its respective param,
calls the resulting goal to exhaustion, and returns an array of zero or
more Maps of zero or more variablename-to-term bindings (each Map
represents a solution, in the order in which they were found).</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>static java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#allSolutions-org.jpl7.Term-">allSolutions</a></span>(<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a> goal)</code>
<div class="block">This static method creates a Query whose goal is the given Term, calls it
to exhaustion, and returns an array of zero or more Maps of zero or more
variablename-to-term bindings (each Map represents a solution, in the
order in which they were found).</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#close--">close</a></span>()</code>
<div class="block">This method can be used to close an open query before its solutions are
exhausted.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#getContext--">getContext</a></span>()</code>
<div class="block">Returns the context module for this Query</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#getEngine--">getEngine</a></span>()</code>
<div class="block">Returns the engine attached to this query</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#getSolution--">getSolution</a></span>()</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>
<div class="block"><span class="deprecationComment">use nextSolution()</span></div>
</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#getSolutionWithVarNames--">getSolutionWithVarNames</a></span>()</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span> </div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#getSubstWithNameVars--">getSubstWithNameVars</a></span>()</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span> </div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#goal--">goal</a></span>()</code>
<div class="block">Returns the Term (Atom or Compound) which is the goal of this Query</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#hasMoreElements--">hasMoreElements</a></span>()</code>
<div class="block">This method implements part of the java.util.Enumeration interface.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#hasMoreSolutions--">hasMoreSolutions</a></span>()</code>
<div class="block">This method returns true if JPL was able to initiate a "call" of this
Query within a Prolog engine.</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#hasNext--">hasNext</a></span>()</code>
<div class="block">This method is required by Iterator interface
It is a wrapper for <a href="../../org/jpl7/Query.html#hasMoreSolutions--"><code>hasMoreSolutions()</code></a></div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#hasSolution--">hasSolution</a></span>()</code>
<div class="block">This method will attempt to call this Query's goal within an available
Prolog engine.</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#hasSolution-java.lang.String-">hasSolution</a></span>(java.lang.String text)</code>
<div class="block">This static method creates a Query from the given Prolog source text and
calls it at most once, returning true if a solution was found, else
false.</div>
</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#hasSolution-java.lang.String-org.jpl7.Term:A-">hasSolution</a></span>(java.lang.String text,
<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>[] params)</code>
<div class="block">If text denotes (in traditional Prolog source syntax) a term containing N
questionmark (?) symbols and there are N params, each questionmark symbol
is replaced by its corresponding arg to provide the new Query's goal: the
resulting Query is called as described above.</div>
</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#hasSolution-org.jpl7.Term-">hasSolution</a></span>(<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a> goal)</code>
<div class="block">This static method creates a Query (whose goal is the specified Term) and
calls it at most once, returning true if a solution was found, else
false.</div>
</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#isOpen--">isOpen</a></span>()</code>
<div class="block">Whether the query is open.</div>
</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code>java.util.Iterator<java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#iterator--">iterator</a></span>()</code>
<div class="block">This method is required by Iterator interface
a Query is its own Iterator</div>
</td>
</tr>
<tr id="i20" class="altColor">
<td class="colFirst"><code>java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#next--">next</a></span>()</code>
<div class="block">This method is required by Iterator interface
It is a wrapper for <a href="../../org/jpl7/Query.html#nextSolution--"><code>nextSolution()</code></a></div>
</td>
</tr>
<tr id="i21" class="rowColor">
<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#nextElement--">nextElement</a></span>()</code>
<div class="block">This method implements part of the java.util.Enumeration interface.</div>
</td>
</tr>
<tr id="i22" class="altColor">
<td class="colFirst"><code>java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#nextSolution--">nextSolution</a></span>()</code>
<div class="block">This method returns a java.util.Map, which represents a binding from the
names of query variables to terms within the next solution.</div>
</td>
</tr>
<tr id="i23" class="rowColor">
<td class="colFirst"><code>java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#nSolutions-long-">nSolutions</a></span>(long n)</code>
<div class="block">calls the Query's goal to exhaustion or until N solutions are found,
whichever is sooner, and returns an array containing (as possibly empty
Maps of variablename-to-term bindings) every found solution (in the order
in which they were found).</div>
</td>
</tr>
<tr id="i24" class="altColor">
<td class="colFirst"><code>static java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#nSolutions-java.lang.String-long-">nSolutions</a></span>(java.lang.String text,
long n)</code>
<div class="block">This static method creates a Query from the given Prolog source text
fragment, calls it to exhaustion or until N solutions are found,
whichever is sooner, and returns an array containing (as possibly empty
Maps of variablename-to-term bindings) every found solution (in the order
in which they were found).</div>
</td>
</tr>
<tr id="i25" class="rowColor">
<td class="colFirst"><code>static java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#nSolutions-java.lang.String-org.jpl7.Term:A-long-">nSolutions</a></span>(java.lang.String text,
<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>[] params,
long n)</code>
<div class="block">If text denotes (in traditional Prolog source syntax) a term containing N
questionmark (?) symbols and there are N accompanying params, this static
method replaces each questionmark symbol by its respective param, calls
the resulting goal to exhaustion or until N solutions are found,
whichever is sooner, and returns an array containing (as possibly empty
Maps of variablename-to-term bindings) every found solution (in the order
in which they were found).</div>
</td>
</tr>
<tr id="i26" class="altColor">
<td class="colFirst"><code>static java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#nSolutions-org.jpl7.Term-long-">nSolutions</a></span>(<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a> goal,
long n)</code>
<div class="block">This static method creates a Query whose goal is the given Term, calls it
to exhaustion or until N solutions are found, whichever is sooner, and
returns an array containing (as possibly empty Maps of
variablename-to-term bindings) every found solution (in the order in
which they were found).</div>
</td>
</tr>
<tr id="i27" class="rowColor">
<td class="colFirst"><code>java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#oneSolution--">oneSolution</a></span>()</code>
<div class="block">Returns the first solution, if any, as a (possibly empty) Map of
variablename-to-term bindings, else null.</div>
</td>
</tr>
<tr id="i28" class="altColor">
<td class="colFirst"><code>static java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#oneSolution-java.lang.String-">oneSolution</a></span>(java.lang.String text)</code>
<div class="block">This static method creates a Query from the given Prolog source text
fragment, and calls it at most once, returning the first solution, if
there is one, as a (possibly empty) Map, else null.</div>
</td>
</tr>
<tr id="i29" class="rowColor">
<td class="colFirst"><code>static java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#oneSolution-java.lang.String-org.jpl7.Term:A-">oneSolution</a></span>(java.lang.String text,
<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>[] params)</code>
<div class="block">If text denotes (in traditional Prolog source syntax) a term containing N
questionmark (?) symbols and there are N params, each questionmark symbol
is replaced by its respective param to provide the goal of this query:
the resulting goal is then called (at most once) and the first solution,
if there is one, is returned as a (possibly empty) Map, else null.</div>
</td>
</tr>
<tr id="i30" class="altColor">
<td class="colFirst"><code>static java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#oneSolution-org.jpl7.Term-">oneSolution</a></span>(<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a> goal)</code>
<div class="block">This static method creates a Query (whose goal is the specified Term) and
calls it at most once, returning the first solution, if there is one, as
a (possibly empty) Map, else null.</div>
</td>
</tr>
<tr id="i31" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#open--">open</a></span>()</code>
<div class="block">This method returns true if JPL was able to initiate a "call" of this
Query within the Prolog engine.</div>
</td>
</tr>
<tr id="i32" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#remove--">remove</a></span>()</code>
<div class="block">This method (required by Iterator interface) is a no-op</div>
</td>
</tr>
<tr id="i33" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#reset--">reset</a></span>()</code>
<div class="block">Reset the query to its start: closed and no solution found so far.</div>
</td>
</tr>
<tr id="i34" class="altColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jpl7/Query.html#toString--">toString</a></span>()</code>
<div class="block">Returns a crude String representation of a Query.</div>
</td>
</tr>
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<h3>Methods inherited from class java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait</code></li>
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<h3>Methods inherited from interface java.lang.Iterable</h3>
<code>forEach, spliterator</code></li>
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<h3>Methods inherited from interface java.util.Iterator</h3>
<code>forEachRemaining</code></li>
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<h3>Field Detail</h3>
<a name="goal_">
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<h4>goal_</h4>
<pre>protected final <a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a> goal_</pre>
<div class="block">the Compound or Atom (but not Dict, Float, Integer or Variable)
corresponding to the goal of this Query</div>
</li>
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<h4>hostModule</h4>
<pre>protected final java.lang.String hostModule</pre>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../constant-values.html#org.jpl7.Query.hostModule">Constant Field Values</a></dd>
</dl>
</li>
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<h4>contextModule</h4>
<pre>protected final java.lang.String contextModule</pre>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../constant-values.html#org.jpl7.Query.contextModule">Constant Field Values</a></dd>
</dl>
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<h4>Query</h4>
<pre>public Query(<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a> t)</pre>
<div class="block">This constructor creates a Query whose goal is the specified Term. The
Query is initially closed. <b>NB</b> Creating an instance of the Query
class does not result in a call to a Prolog engine. <b>NB</b> The goal
can be a Compound or an Atom (Atom extends Compound), but cannot be an
instance of jpl.Float, jpl.Integer or jpl.Variable.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>t</code> - the goal of this Query; must be Atom or Compound</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../org/jpl7/JPLException.html" title="class in org.jpl7">JPLException</a></code> - if term provided is not of right sort Atom or Compound</dd>
</dl>
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<pre>public Query(java.lang.String text)</pre>
<div class="block">This constructor builds a Query from the given Prolog source text, "as is".
Throws PrologException containing error(syntax_error(_),_) if text is invalid.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>text</code> - the complete Prolog source text of this Query</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../org/jpl7/PrologException.html" title="class in org.jpl7">PrologException</a></code> - containing error(syntax_error(_),_) if text is invalid as a term.</dd>
<dd><code><a href="../../org/jpl7/JPLException.html" title="class in org.jpl7">JPLException</a></code> - if term provided is not of right sort Atom or Compound</dd>
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<pre>public Query(java.lang.String text,
<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>[] args)</pre>
<div class="block">If text denotes an atom, this constructor is shorthand for
new Query(new Compound(name,args)).
If text denotes a term containing N placehholder symbols ? and there are N args,
each ? is replaced by its corresponding arg to provide the new Query's goal.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>text</code> - the name of the principal functor of this Query's goal</dd>
<dd><code>args</code> - the arguments of this Query's goal</dd>
</dl>
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<pre>public Query(java.lang.String text,
<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a> arg)</pre>
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<h3>Method Detail</h3>
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<pre>public final <a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a> goal()</pre>
<div class="block">Returns the Term (Atom or Compound) which is the goal of this Query</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a Term representing the goal of this Query</dd>
</dl>
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<pre>public final java.lang.String getContext()</pre>
<div class="block">Returns the context module for this Query</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a String representing the context in which the goal will be run</dd>
</dl>
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<pre>public java.util.Iterator<java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>> iterator()</pre>
<div class="block">This method is required by Iterator interface
a Query is its own Iterator</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>iterator</code> in interface <code>java.lang.Iterable<java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>></code></dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><code>Iterable.iterator()</code></dd>
</dl>
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<pre>public boolean hasNext()</pre>
<div class="block">This method is required by Iterator interface
It is a wrapper for <a href="../../org/jpl7/Query.html#hasMoreSolutions--"><code>hasMoreSolutions()</code></a></div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>hasNext</code> in interface <code>java.util.Iterator<java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>></code></dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><code>Iterator.hasNext()</code></dd>
</dl>
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<pre>public java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>> next()</pre>
<div class="block">This method is required by Iterator interface
It is a wrapper for <a href="../../org/jpl7/Query.html#nextSolution--"><code>nextSolution()</code></a></div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>next</code> in interface <code>java.util.Iterator<java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>></code></dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><code>Iterator.next()</code></dd>
</dl>
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<pre>public void remove()</pre>
<div class="block">This method (required by Iterator interface) is a no-op</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>remove</code> in interface <code>java.util.Iterator<java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>></code></dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><code>Iterator.remove()</code></dd>
</dl>
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<pre>public final boolean hasMoreElements()</pre>
<div class="block">This method implements part of the java.util.Enumeration interface.
It is a wrapper for <a href="../../org/jpl7/Query.html#hasMoreSolutions--"><code>hasMoreSolutions()</code></a>.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the Prolog query yields a (or another) solution, else
false.</dd>
</dl>
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<pre>public final java.lang.Object nextElement()</pre>
<div class="block">This method implements part of the java.util.Enumeration interface.
It is a wrapper for <a href="../../org/jpl7/Query.html#nextSolution--"><code>nextSolution()</code></a>
<p></div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A Map representing a substitution.</dd>
</dl>
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<pre>public final boolean isOpen()</pre>
<div class="block">Whether the query is open.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the query is open, otherwise false.</dd>
</dl>
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<pre>public final long getEngine()</pre>
<div class="block">Returns the engine attached to this query</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a long number representing the id of the SWI Prolog engine used in this query</dd>
</dl>
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<pre>public final boolean hasMoreSolutions()</pre>
<div class="block">This method returns true if JPL was able to initiate a "call" of this
Query within a Prolog engine. It is designed to be used with the
nextSolution() method to retrieve one or more substitutions in the form
of Maps. To iterate through all the solutions to a Query, for example,
one might write
<pre>
Query q = // obtain Query reference
while (q.hasMoreSolutions()) {
Map solution = q.nextSolution();
// process solution...
}
</pre></div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the Prolog query succeeds; otherwise false.</dd>
</dl>
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<pre>public final void open()</pre>
<div class="block">This method returns true if JPL was able to initiate a "call" of this
Query within the Prolog engine. It is designed to be used with the
getSolution() and close() methods to retrieve one or more substitutions
in the form of Maps.
<pre>
Query q = // obtain Query reference
Map soln;
q.open();
while ((soln = q.getSolution()) != null) {
// process solution...
}
</pre>
<p>
If this method is called on an already-open Query, or if the query cannot
be set up for whatever reason, then a JPLException will be thrown.</div>
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<h4>reset</h4>
<pre>public final void reset()</pre>
<div class="block">Reset the query to its start: closed and no solution found so far. This will allow a query to re-start</div>
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<pre>@Deprecated
public final java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>> getSolution()</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span> <span class="deprecationComment">use nextSolution()</span></div>
<div class="block">Returns the next solution of the query</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the binding representing the next solution</dd>
</dl>
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<pre>@Deprecated
public final java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>> getSubstWithNameVars()</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span> </div>
<div class="block">Used to be used only by Utils.textToTerm but code has been integrated there already</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a substituion from variable names to terms</dd>
</dl>
</li>
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<pre>public final java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>> nextSolution()</pre>
<div class="block">This method returns a java.util.Map, which represents a binding from the
names of query variables to terms within the next solution.
<p>
For example, if a Query has an occurrence of a jpl.Variable, say, named
"X", one can obtain the Term bound to "X" in the solution by looking up
"X" in the Map.
<pre>
Variable x = new Variable("X");
Query q = // obtain Query reference (with x in the Term array)
while (q.hasMoreSolutions()) {
Map solution = q.nextSolution();
// make t the Term bound to "X" in the solution
Term t = (Term) solution.get("X");
// ...
}
</pre>
Programmers should be careful to call this method after checking that
there is indeed a solution, via method hasMoreSolutions().</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A Map representing a substitution of the next solution.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../org/jpl7/JPLException.html" title="class in org.jpl7">JPLException</a></code> - if Query is not open.</dd>
<dd><code>java.util.NoSuchElementException</code> - if there are no more new solutions.</dd>
</dl>
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<pre>@Deprecated
public final java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>> getSolutionWithVarNames()</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span> </div>
<div class="block">Deprecated. Used to be used only in the context of Term.textToTerm() but a better solution has been
implemented there and hence does not require this difficult method anymore. Left it for reference.
This is called with query
atom_to_term(Atom, Term, Bindings) https://www.swi-prolog.org/pldoc/doc_for?object=atom_to_term/3
and we aim to return the Term version of Atom but with the name of the variables inside, not thir anonymous _
references. To do so we extract the names from Bindings and we plugged them into the Term
So, we assume the last argument of the current querry is a Binding list of the form [Name=Var,..], that is a
list containing variable names to actual Prolog variable references, like ['S'=_4518, 'P'=_4520].
E.g., atom_to_term('hello(a, X, Y)', T, B)
T = hello(a, _1, _2)
B = [ 'X' = _1, 'Y' = _2]
The whole point is to return a JPL Term but having NAMED variables, that is
returning the Compound Term hello(a, X, Y) where X and Y are JPL Variables (with names "X" and "Y")</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a Term with the variables with names</dd>
</dl>
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<pre>public final void close()</pre>
<div class="block">This method can be used to close an open query before its solutions are
exhausted. It is called automatically when solutions are exhausted.
Calling close() on an already closed Query has no effect.
<p>
Here is one way to get the first three solutions to a Query:
<pre>
Query q = new Query(predicate, args);
Map<String, Term> sub1 = q.nextSolution();
Map<String, Term> sub2 = q.nextSolution();
Map<String, Term> sub3 = q.nextSolution();
q.close();
</pre></div>
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<pre>public final java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>[] allSolutions()</pre>
<div class="block">calls the Query's goal to exhaustion and returns an array of zero or more
Maps of zero or more variablename-to-term bindings (each Map represents a
solution, in the order in which they were found).</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an array of zero or more Maps of zero or more
variablename-to-term bindings (each Map represents a solution, in
the order in which they were found) <b>NB</b> in JPL 1.0.1, this
method (inconsistently) returned null when a Query had no
solutions; in JPL 2.x onwards it returns an empty array (thus the
length of the array is, in every case, the quantity of
solutions).
<p>
<b>NB</b> in JPL 1.0.1, bindings were keyed (awkwardly) by
Variable instances; in JPL 2.x onwards they are keyed by the
(String) names of variables, which is consistent with the Term
type being just a concrete syntax for terms (and hence queries).</dd>
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<pre>public static final java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>[] allSolutions(<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a> goal)</pre>
<div class="block">This static method creates a Query whose goal is the given Term, calls it
to exhaustion, and returns an array of zero or more Maps of zero or more
variablename-to-term bindings (each Map represents a solution, in the
order in which they were found). Throws JPLException if goal is neither a
jpl.Atom nor a jpl.Compound.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>goal</code> - the goal of this Query</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an array of zero or more Maps of zero or more
variablename-to-term bindings (each Map represents a solution, in
the order in which they were found)</dd>
</dl>
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<pre>public static final java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>[] allSolutions(java.lang.String text)</pre>
<div class="block">This static method creates a Query from the given Prolog source text
fragment, calls it to exhaustion, and returns an array of zero or more
Maps of zero or more variablename-to-term bindings (each Map represents a
solution, in the order in which they were found). Throws PrologException
containing error(syntax_error(_),_) if text is invalid.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>text</code> - a Prolog source text fragment denoting a goal</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an array of zero or more Maps of zero or more
variablename-to-term bindings (each Map represents a solution, in
the order in which they were found)</dd>
</dl>
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<pre>public static final java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>[] allSolutions(java.lang.String text,
<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>[] params)</pre>
<div class="block">If text denotes (in traditional Prolog source syntax) a term containing N
questionmark (?) symbols and there are N accompanying Term params, this
static method replaces each questionmark symbol by its respective param,
calls the resulting goal to exhaustion, and returns an array of zero or
more Maps of zero or more variablename-to-term bindings (each Map
represents a solution, in the order in which they were found).
Otherwise, if text denotes an atom, this static method creates a Query
where text is the name of the goal and params are the args; the resulting
goal is then called as above. This letter mode is redundant, deprecated
(informally), and retained only for backward compatibility.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>text</code> - the Prolog source text of a goal, in which questionmarks are
regarded as substitutible parameters</dd>
<dd><code>params</code> - terms to be substituted for the respective questionmarks in
the query text</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an array of zero or more Maps of zero or more
variablename-to-term bindings (each Map represents a solution, in
the order in which they were found)</dd>
</dl>
</li>
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<pre>public final java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>[] nSolutions(long n)</pre>
<div class="block">calls the Query's goal to exhaustion or until N solutions are found,
whichever is sooner, and returns an array containing (as possibly empty
Maps of variablename-to-term bindings) every found solution (in the order
in which they were found).</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>n</code> - the number of solutions to cover</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an array of Maps (possibly none), each of which is a solution (in
the order in which they were found) of the Query; at most 'n'
solutions will be found and returned. <b>NB</b> in JPL 1.0.1,
this method (inconsistently) returned null when a Query had no
solutions; in JPL 2.x onwards it returns an empty array (thus the
length of the array is, in every case, the quantity of
solutions).
<p>
<b>NB</b> in JPL 1.0.1, bindings were keyed (awkwardly) by
Variable instances; in JPL 2.x onwards they are keyed by the
(String) names of variables, which is consistent with the Term
type being just a concrete syntax for terms (and hence queries).</dd>
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<pre>public static final java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>[] nSolutions(<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a> goal,
long n)</pre>
<div class="block">This static method creates a Query whose goal is the given Term, calls it
to exhaustion or until N solutions are found, whichever is sooner, and
returns an array containing (as possibly empty Maps of
variablename-to-term bindings) every found solution (in the order in
which they were found). Throws JPLException if goal is neither a jpl.Atom
nor a jpl.Compound.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>goal</code> - the goal of this Query</dd>
<dd><code>n</code> - the number of solutions to cover</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an array of up to the the first n binding solutions</dd>
</dl>
</li>
</ul>
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<pre>public static final java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>[] nSolutions(java.lang.String text,
long n)</pre>
<div class="block">This static method creates a Query from the given Prolog source text
fragment, calls it to exhaustion or until N solutions are found,
whichever is sooner, and returns an array containing (as possibly empty
Maps of variablename-to-term bindings) every found solution (in the order
in which they were found). Throws PrologException containing
error(syntax_error(_),_) if text is invalid.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>text</code> - a Prolog source text fragment denoting a goal</dd>
<dd><code>n</code> - the number of solutions to cover</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an array of up to the the first n binding solutions</dd>
</dl>
</li>
</ul>
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<pre>public static final java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>>[] nSolutions(java.lang.String text,
<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>[] params,
long n)</pre>
<div class="block">If text denotes (in traditional Prolog source syntax) a term containing N
questionmark (?) symbols and there are N accompanying params, this static
method replaces each questionmark symbol by its respective param, calls
the resulting goal to exhaustion or until N solutions are found,
whichever is sooner, and returns an array containing (as possibly empty
Maps of variablename-to-term bindings) every found solution (in the order
in which they were found).
Otherwise, if text denotes an atom, this static method creates a Query
where text is the name of the goal and params are the args; the resulting
goal is then called as above. This latter mode is redundant, deprecated
(informally), and retained only for backward compatibility.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>text</code> - the Prolog source text of a goal, in which questionmarks are
regarded as substitutible parameters</dd>
<dd><code>params</code> - terms to be substituted for the respective questionmarks in
the query text</dd>
<dd><code>n</code> - the number of solutions to cover</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an array of up to the the first n binding solutions</dd>
</dl>
</li>
</ul>
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<pre>public final java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>> oneSolution()</pre>
<div class="block">Returns the first solution, if any, as a (possibly empty) Map of
variablename-to-term bindings, else null.
This method will throw a JPLException if this Query is already open (and
the Query will remain open as before). Otherwise, upon return, the Query
will be closed.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the first solution, if the query has one, as a (possibly empty)
Map. If the return value is null, this means that the Query has
no solutions.</dd>
</dl>
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</ul>
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<pre>public static final java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>> oneSolution(<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a> goal)</pre>
<div class="block">This static method creates a Query (whose goal is the specified Term) and
calls it at most once, returning the first solution, if there is one, as
a (possibly empty) Map, else null. The goal can be a jpl.Atom or a
jpl.Compound, but cannot be an instance of jpl.Float, jpl.Integer or
jpl.Variable.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>goal</code> - the goal of this Query</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>binding of the first solution</dd>
</dl>
</li>
</ul>
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<pre>public static final java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>> oneSolution(java.lang.String text)</pre>
<div class="block">This static method creates a Query from the given Prolog source text
fragment, and calls it at most once, returning the first solution, if
there is one, as a (possibly empty) Map, else null. Throws
PrologException containing error(syntax_error(_),_) if text is invalid.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>text</code> - a Prolog source text fragment denoting a goal</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>binding of the first solution</dd>
</dl>
</li>
</ul>
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<pre>public static final java.util.Map<java.lang.String,<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>> oneSolution(java.lang.String text,
<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>[] params)</pre>
<div class="block">If text denotes (in traditional Prolog source syntax) a term containing N
questionmark (?) symbols and there are N params, each questionmark symbol
is replaced by its respective param to provide the goal of this query:
the resulting goal is then called (at most once) and the first solution,
if there is one, is returned as a (possibly empty) Map, else null.
Otherwise, if text denotes an atom, this static method creates a Query
where text is the name of the goal and params are the args; the resulting
goal is then called as above. This latter mode is redundant, deprecated
(informally), and retained only for backward compatibility.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>text</code> - the Prolog source text of a goal, in which questionmarks are
regarded as substitutible parameters</dd>
<dd><code>params</code> - terms to be substituted for the respective questionmarks in
the query text</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>binding of the first solution</dd>
</dl>
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<pre>public final boolean hasSolution()</pre>
<div class="block">This method will attempt to call this Query's goal within an available
Prolog engine.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the provability of the Query, i.e. 'true' if it has at least one
solution, 'false' if the call fails without finding a solution.
<p>
Only the first solution (if there is one) will be found; any
bindings will be discarded, and the Query will be closed.
<p>
This method will throw a JPLException if this Query is already
open.</dd>
</dl>
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<pre>public static final boolean hasSolution(<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a> goal)</pre>
<div class="block">This static method creates a Query (whose goal is the specified Term) and
calls it at most once, returning true if a solution was found, else
false. The goal can be a jpl.Atom or a jpl.Compound, but cannot be an
instance of jpl.Float, jpl.Integer or jpl.Variable.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>goal</code> - the goal of this Query</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true iff the query can be proved</dd>
</dl>
</li>
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<pre>public static final boolean hasSolution(java.lang.String text)</pre>
<div class="block">This static method creates a Query from the given Prolog source text and
calls it at most once, returning true if a solution was found, else
false. Throws PrologException containing error(syntax_error(_),_) if text
is invalid.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>text</code> - the goal of this Query, as Prolog source text</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true iff the query can be proved</dd>
</dl>
</li>
</ul>
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<pre>public static final boolean hasSolution(java.lang.String text,
<a href="../../org/jpl7/Term.html" title="class in org.jpl7">Term</a>[] params)</pre>
<div class="block">If text denotes (in traditional Prolog source syntax) a term containing N
questionmark (?) symbols and there are N params, each questionmark symbol
is replaced by its corresponding arg to provide the new Query's goal: the
resulting Query is called as described above.
Otherwise, if text denotes an atom, this static method creates a Query
where text is the name of its goal and args are its args; it then calls
this goal (at most once) and returns true if a solution was found, else
false. This latter mode is redundant, deprecated (informally), and
retained only for backward compatibility.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>text</code> - the Prolog source text of a goal, in which questionmarks are
regarded as substitutible parameters</dd>
<dd><code>params</code> - terms to be substituted for the respective questionmarks in
the query text</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true iff the query can be proved</dd>
</dl>
</li>
</ul>
<a name="toString--">
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<h4>toString</h4>
<pre>public java.lang.String toString()</pre>
<div class="block">Returns a crude String representation of a Query.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code>toString</code> in class <code>java.lang.Object</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a crude String representation of a Query</dd>
</dl>
</li>
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