File: PathExpression.html

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<TITLE>
PathExpression
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com.icl.saxon.expr</FONT>
<BR>
Class PathExpression</H2>
<PRE>
java.lang.Object
  <IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../../com/icl/saxon/expr/Expression.html" title="class in com.icl.saxon.expr">com.icl.saxon.expr.Expression</A>
      <IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html" title="class in com.icl.saxon.expr">com.icl.saxon.expr.NodeSetExpression</A>
          <IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><B>com.icl.saxon.expr.PathExpression</B>
</PRE>
<HR>
<DL>
<DT>public class <B>PathExpression</B><DT>extends <A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html" title="class in com.icl.saxon.expr">NodeSetExpression</A></DL>

<P>
An expression that establishes a set of nodes by following relationships between nodes
 in the document. Specifically, it consists of a start expression which defines a set of
 nodes, and a Step which defines a relationship to be followed from those nodes to create
 a new set of nodes.
<P>

<P>
<HR>

<P>
<!-- ======== NESTED CLASS SUMMARY ======== -->


<!-- =========== FIELD SUMMARY =========== -->

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<B>Field Summary</B></FONT></TD>
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&nbsp;<A NAME="fields_inherited_from_class_com.icl.saxon.expr.Expression"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TD><B>Fields inherited from class com.icl.saxon.expr.<A HREF="../../../../com/icl/saxon/expr/Expression.html" title="class in com.icl.saxon.expr">Expression</A></B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../com/icl/saxon/expr/Expression.html#staticContext">staticContext</A></CODE></TD>
</TR>
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&nbsp;
<!-- ======== CONSTRUCTOR SUMMARY ======== -->

<A NAME="constructor_summary"><!-- --></A>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../com/icl/saxon/expr/PathExpression.html#PathExpression(com.icl.saxon.expr.Expression, com.icl.saxon.expr.Step)">PathExpression</A></B>(<A HREF="../../../../com/icl/saxon/expr/Expression.html" title="class in com.icl.saxon.expr">Expression</A>&nbsp;start,
               <A HREF="../../../../com/icl/saxon/expr/Step.html" title="class in com.icl.saxon.expr">Step</A>&nbsp;step)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Constructor</TD>
</TR>
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&nbsp;
<!-- ========== METHOD SUMMARY =========== -->

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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/icl/saxon/expr/PathExpression.html#display(int)">display</A></B>(int&nbsp;level)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Diagnostic print of expression structure</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../com/icl/saxon/om/NodeEnumeration.html" title="interface in com.icl.saxon.om">NodeEnumeration</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/icl/saxon/expr/PathExpression.html#enumerate(com.icl.saxon.Context, boolean)">enumerate</A></B>(<A HREF="../../../../com/icl/saxon/Context.html" title="class in com.icl.saxon">Context</A>&nbsp;context,
          boolean&nbsp;sort)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Evaluate the path-expression in a given context to return a NodeSet</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/icl/saxon/expr/PathExpression.html#getDependencies()">getDependencies</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Determine which aspects of the context the expression depends on.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/icl/saxon/expr/PathExpression.html#isContextDocumentNodeSet()">isContextDocumentNodeSet</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Determine, in the case of an expression whose data type is Value.NODESET,
 whether all the nodes in the node-set are guaranteed to come from the same
 document as the context node.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../com/icl/saxon/expr/Expression.html" title="class in com.icl.saxon.expr">Expression</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/icl/saxon/expr/PathExpression.html#reduce(int, com.icl.saxon.Context)">reduce</A></B>(int&nbsp;dep,
       <A HREF="../../../../com/icl/saxon/Context.html" title="class in com.icl.saxon">Context</A>&nbsp;context)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Perform a partial evaluation of the expression, by eliminating specified dependencies
 on the context.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../com/icl/saxon/expr/Expression.html" title="class in com.icl.saxon.expr">Expression</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/icl/saxon/expr/PathExpression.html#simplify()">simplify</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Simplify an expression</TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_com.icl.saxon.expr.NodeSetExpression"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TD><B>Methods inherited from class com.icl.saxon.expr.<A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html" title="class in com.icl.saxon.expr">NodeSetExpression</A></B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html#evaluate(com.icl.saxon.Context)">evaluate</A>, <A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html#evaluateAsBoolean(com.icl.saxon.Context)">evaluateAsBoolean</A>, <A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html#evaluateAsNodeSet(com.icl.saxon.Context)">evaluateAsNodeSet</A>, <A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html#evaluateAsString(com.icl.saxon.Context)">evaluateAsString</A>, <A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html#getDataType()">getDataType</A>, <A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html#outputStringValue(com.icl.saxon.output.Outputter, com.icl.saxon.Context)">outputStringValue</A>, <A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html#selectFirst(com.icl.saxon.Context)">selectFirst</A></CODE></TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_com.icl.saxon.expr.Expression"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TD><B>Methods inherited from class com.icl.saxon.expr.<A HREF="../../../../com/icl/saxon/expr/Expression.html" title="class in com.icl.saxon.expr">Expression</A></B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../com/icl/saxon/expr/Expression.html#containsReferences()">containsReferences</A>, <A HREF="../../../../com/icl/saxon/expr/Expression.html#evaluateAsNumber(com.icl.saxon.Context)">evaluateAsNumber</A>, <A HREF="../../../../com/icl/saxon/expr/Expression.html#getStaticContext()">getStaticContext</A>, <A HREF="../../../../com/icl/saxon/expr/Expression.html#indent(int)">indent</A>, <A HREF="../../../../com/icl/saxon/expr/Expression.html#make(java.lang.String, com.icl.saxon.expr.StaticContext)">make</A>, <A HREF="../../../../com/icl/saxon/expr/Expression.html#setStaticContext(com.icl.saxon.expr.StaticContext)">setStaticContext</A>, <A HREF="../../../../com/icl/saxon/expr/Expression.html#usesCurrent()">usesCurrent</A></CODE></TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TD><B>Methods inherited from class java.lang.Object</B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
</TR>
</TABLE>
&nbsp;
<P>

<!-- ============ FIELD DETAIL =========== -->


<!-- ========= CONSTRUCTOR DETAIL ======== -->

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<B>Constructor Detail</B></FONT></TD>
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</TABLE>

<A NAME="PathExpression(com.icl.saxon.expr.Expression, com.icl.saxon.expr.Step)"><!-- --></A><H3>
PathExpression</H3>
<PRE>
public <B>PathExpression</B>(<A HREF="../../../../com/icl/saxon/expr/Expression.html" title="class in com.icl.saxon.expr">Expression</A>&nbsp;start,
                      <A HREF="../../../../com/icl/saxon/expr/Step.html" title="class in com.icl.saxon.expr">Step</A>&nbsp;step)</PRE>
<DL>
<DD>Constructor
<P>
<DT><B>Parameters:</B><DD><CODE>start</CODE> - A node-set expression denoting the absolute or relative set of nodes from which the
 navigation path should start.<DD><CODE>step</CODE> - The step to be followed from each node in the start expression to yield a new
 node-set</DL>

<!-- ============ METHOD DETAIL ========== -->

<A NAME="method_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<B>Method Detail</B></FONT></TD>
</TR>
</TABLE>

<A NAME="simplify()"><!-- --></A><H3>
simplify</H3>
<PRE>
public <A HREF="../../../../com/icl/saxon/expr/Expression.html" title="class in com.icl.saxon.expr">Expression</A> <B>simplify</B>()
                    throws <A HREF="../../../../com/icl/saxon/expr/XPathException.html" title="class in com.icl.saxon.expr">XPathException</A></PRE>
<DL>
<DD>Simplify an expression
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../com/icl/saxon/expr/Expression.html#simplify()">simplify</A></CODE> in class <CODE><A HREF="../../../../com/icl/saxon/expr/Expression.html" title="class in com.icl.saxon.expr">Expression</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the simplified expression
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../com/icl/saxon/expr/XPathException.html" title="class in com.icl.saxon.expr">XPathException</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="getDependencies()"><!-- --></A><H3>
getDependencies</H3>
<PRE>
public int <B>getDependencies</B>()</PRE>
<DL>
<DD>Determine which aspects of the context the expression depends on. The result is
 a bitwise-or'ed value composed from constants such as Context.VARIABLES and
 Context.CURRENT_NODE
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../com/icl/saxon/expr/Expression.html#getDependencies()">getDependencies</A></CODE> in class <CODE><A HREF="../../../../com/icl/saxon/expr/Expression.html" title="class in com.icl.saxon.expr">Expression</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="isContextDocumentNodeSet()"><!-- --></A><H3>
isContextDocumentNodeSet</H3>
<PRE>
public boolean <B>isContextDocumentNodeSet</B>()</PRE>
<DL>
<DD>Determine, in the case of an expression whose data type is Value.NODESET,
 whether all the nodes in the node-set are guaranteed to come from the same
 document as the context node. Used for optimization.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../com/icl/saxon/expr/Expression.html#isContextDocumentNodeSet()">isContextDocumentNodeSet</A></CODE> in class <CODE><A HREF="../../../../com/icl/saxon/expr/Expression.html" title="class in com.icl.saxon.expr">Expression</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="reduce(int, com.icl.saxon.Context)"><!-- --></A><H3>
reduce</H3>
<PRE>
public <A HREF="../../../../com/icl/saxon/expr/Expression.html" title="class in com.icl.saxon.expr">Expression</A> <B>reduce</B>(int&nbsp;dep,
                         <A HREF="../../../../com/icl/saxon/Context.html" title="class in com.icl.saxon">Context</A>&nbsp;context)
                  throws <A HREF="../../../../com/icl/saxon/expr/XPathException.html" title="class in com.icl.saxon.expr">XPathException</A></PRE>
<DL>
<DD>Perform a partial evaluation of the expression, by eliminating specified dependencies
 on the context.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../com/icl/saxon/expr/Expression.html#reduce(int, com.icl.saxon.Context)">reduce</A></CODE> in class <CODE><A HREF="../../../../com/icl/saxon/expr/Expression.html" title="class in com.icl.saxon.expr">Expression</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>dep</CODE> - The dependencies to be removed<DD><CODE>context</CODE> - The context to be used for the partial evaluation
<DT><B>Returns:</B><DD>a new expression that does not have any of the specified
 dependencies
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../com/icl/saxon/expr/XPathException.html" title="class in com.icl.saxon.expr">XPathException</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="enumerate(com.icl.saxon.Context, boolean)"><!-- --></A><H3>
enumerate</H3>
<PRE>
public <A HREF="../../../../com/icl/saxon/om/NodeEnumeration.html" title="interface in com.icl.saxon.om">NodeEnumeration</A> <B>enumerate</B>(<A HREF="../../../../com/icl/saxon/Context.html" title="class in com.icl.saxon">Context</A>&nbsp;context,
                                 boolean&nbsp;sort)
                          throws <A HREF="../../../../com/icl/saxon/expr/XPathException.html" title="class in com.icl.saxon.expr">XPathException</A></PRE>
<DL>
<DD>Evaluate the path-expression in a given context to return a NodeSet
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html#enumerate(com.icl.saxon.Context, boolean)">enumerate</A></CODE> in class <CODE><A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html" title="class in com.icl.saxon.expr">NodeSetExpression</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>context</CODE> - the evaluation context<DD><CODE>sort</CODE> - true if the returned nodes must be in document order
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../com/icl/saxon/expr/XPathException.html" title="class in com.icl.saxon.expr">XPathException</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="display(int)"><!-- --></A><H3>
display</H3>
<PRE>
public void <B>display</B>(int&nbsp;level)</PRE>
<DL>
<DD>Diagnostic print of expression structure
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../com/icl/saxon/expr/Expression.html#display(int)">display</A></CODE> in class <CODE><A HREF="../../../../com/icl/saxon/expr/Expression.html" title="class in com.icl.saxon.expr">Expression</A></CODE></DL>
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