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<li><a href="#method-i-predicate">#predicate</a></li>
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<h1 class="class">Redland::Statement</h1>
<div id="description" class="description">
<p><a href="../Redland.html">Redland</a> <a href="Statement.html">Statement</a> (triple class). The main means of manipulating statements is by the subject,predicate,and object properties</p>
<pre>
require 'rdf'
Statement creation from nodes
statement1 = Statement.new(node1,node2,node3)
statement2 = Statement.new(:statement=>statement)
if statement2.resource?
puts "statement2.subject has uri #{statement2.subject.uri}"
</pre></div>
<!-- description -->
<div id="5Buntitled-5D" class="documentation-section"><!-- Attributes -->
<div id="attribute-method-details" class="method-section section">
<h3 class="section-header">Attributes</h3>
<div id="statement-attribute-method" class="method-detail"><a name="statement" id="statement"></a>
<div class="method-heading attribute-method-heading"><span class="method-name">statement</span><span class="attribute-access-type">[R]</span></div>
<div class="method-description">
<p>the internal librdf statement</p>
</div>
</div>
</div>
<!-- attribute-method-details -->
<!-- Methods -->
<div id="public-class-method-details" class="method-section section">
<h3 class="section-header">Public Class Methods</h3>
<div id="create_finalizer-method" class="method-detail"><a name="method-c-create_finalizer" id="method-c-create_finalizer"></a>
<div class="method-heading"><span class="method-name">create_finalizer</span><span class="method-args">(statement)</span> <span class="method-click-advice">click to toggle source</span></div>
<div class="method-description">
<p>You shouldn't use this. Used internally for cleanup.</p>
<div class="method-source-code" id="create_finalizer-source">
<pre>
<span class="ruby-comment"># File rdf/redland/statement.rb, line 70</span>
<span class="ruby-keyword">def</span> <span class="ruby-constant">Statement</span>.<span class="ruby-identifier">create_finalizer</span>(<span class="ruby-identifier">statement</span>)
<span class="ruby-identifier">proc</span> {<span class="ruby-operator">|</span><span class="ruby-identifier">id</span><span class="ruby-operator">|</span> <span class="ruby-constant">Redland</span><span class="ruby-operator">::</span><span class="ruby-identifier">librdf_free_statement</span>(<span class="ruby-identifier">statement</span>) }
<span class="ruby-keyword">end</span>
</pre></div>
<!-- create_finalizer-source --></div>
</div>
<!-- create_finalizer-method -->
<div id="new-method" class="method-detail"><a name="method-c-new" id="method-c-new"></a>
<div class="method-heading"><span class="method-name">new</span><span class="method-args">(subject=nil,predicate=nil,object=nil,model=nil)</span> <span class="method-click-advice">click to toggle source</span></div>
<div class="method-description">
<p>create a new <a href="Statement.html">Statement</a> with subject,predicate,and object the subject, predicate, and objects can be of class String or <a href="Uri.html">Uri</a>.</p>
<div class="method-source-code" id="new-source">
<pre>
<span class="ruby-comment"># File rdf/redland/statement.rb, line 25</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">initialize</span>(<span class="ruby-identifier">subject</span>=<span class="ruby-keyword">nil</span>,<span class="ruby-identifier">predicate</span>=<span class="ruby-keyword">nil</span>,<span class="ruby-identifier">object</span>=<span class="ruby-keyword">nil</span>,<span class="ruby-identifier">model</span>=<span class="ruby-keyword">nil</span>)
<span class="ruby-ivar">@model</span> = <span class="ruby-identifier">model</span>
<span class="ruby-keyword">if</span> <span class="ruby-identifier">subject</span>.<span class="ruby-identifier">class</span> <span class="ruby-operator">==</span> <span class="ruby-constant">Hash</span>
<span class="ruby-keyword">if</span> <span class="ruby-identifier">subject</span>.<span class="ruby-identifier">key?</span>(<span class="ruby-value">:from_object</span>)
<span class="ruby-ivar">@statement</span> = <span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_new_statement_from_statement</span>(<span class="ruby-identifier">subject</span>[<span class="ruby-value">:from_object</span>])
<span class="ruby-ivar">@model</span> = <span class="ruby-identifier">subject</span>[<span class="ruby-value">:model</span>]
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">else</span>
<span class="ruby-keyword">unless</span> <span class="ruby-identifier">subject</span>
<span class="ruby-identifier">s</span> = <span class="ruby-keyword">nil</span>
<span class="ruby-keyword">else</span>
<span class="ruby-keyword">if</span> (<span class="ruby-identifier">subject</span>.<span class="ruby-identifier">class</span> <span class="ruby-operator">==</span> <span class="ruby-constant">Uri</span>)<span class="ruby-operator">||</span> (<span class="ruby-identifier">subject</span>.<span class="ruby-identifier">class</span> <span class="ruby-operator">==</span> <span class="ruby-constant">String</span>)
<span class="ruby-identifier">subject</span> = <span class="ruby-constant">Node</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">subject</span>)
<span class="ruby-keyword">end</span>
<span class="ruby-identifier">s</span> = <span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_new_node_from_node</span>(<span class="ruby-identifier">subject</span>.<span class="ruby-identifier">node</span>)
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">unless</span> <span class="ruby-identifier">predicate</span>
<span class="ruby-identifier">p</span> = <span class="ruby-keyword">nil</span>
<span class="ruby-keyword">else</span>
<span class="ruby-keyword">if</span> (<span class="ruby-identifier">predicate</span>.<span class="ruby-identifier">class</span> <span class="ruby-operator">==</span> <span class="ruby-constant">Uri</span>) <span class="ruby-operator">||</span> (<span class="ruby-identifier">predicate</span>.<span class="ruby-identifier">class</span> <span class="ruby-operator">==</span> <span class="ruby-constant">String</span>)
<span class="ruby-identifier">predicate</span> = <span class="ruby-constant">Node</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">predicate</span>)
<span class="ruby-keyword">end</span>
<span class="ruby-identifier">p</span> = <span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_new_node_from_node</span>(<span class="ruby-identifier">predicate</span>.<span class="ruby-identifier">node</span>)
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">unless</span> <span class="ruby-identifier">object</span>
<span class="ruby-identifier">o</span> = <span class="ruby-keyword">nil</span>
<span class="ruby-keyword">else</span>
<span class="ruby-keyword">if</span> (<span class="ruby-identifier">object</span>.<span class="ruby-identifier">class</span> <span class="ruby-operator">==</span> <span class="ruby-constant">Uri</span>) <span class="ruby-operator">||</span> (<span class="ruby-identifier">object</span>.<span class="ruby-identifier">class</span> <span class="ruby-operator">==</span> <span class="ruby-constant">String</span>)
<span class="ruby-identifier">object</span> = <span class="ruby-constant">Node</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">object</span>)
<span class="ruby-keyword">end</span>
<span class="ruby-identifier">o</span> = <span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_new_node_from_node</span>(<span class="ruby-identifier">object</span>.<span class="ruby-identifier">node</span>)
<span class="ruby-keyword">end</span>
<span class="ruby-ivar">@statement</span> = <span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_new_statement_from_nodes</span>(<span class="ruby-identifier">$world</span>.<span class="ruby-identifier">world</span>,<span class="ruby-identifier">s</span>,<span class="ruby-identifier">p</span>,<span class="ruby-identifier">o</span>)
<span class="ruby-keyword">end</span>
<span class="ruby-identifier">raise</span> <span class="ruby-constant">RedlandError</span>.<span class="ruby-identifier">new</span>(<span class="ruby-string">"Statement construction failed"</span>) <span class="ruby-keyword">if</span> <span class="ruby-operator">!</span><span class="ruby-ivar">@statement</span>
<span class="ruby-constant">ObjectSpace</span>.<span class="ruby-identifier">define_finalizer</span>(<span class="ruby-keyword">self</span>,<span class="ruby-constant">Statement</span>.<span class="ruby-identifier">create_finalizer</span>(<span class="ruby-ivar">@statement</span>))
<span class="ruby-keyword">end</span>
</pre></div>
<!-- new-source --></div>
</div>
<!-- new-method --></div>
<!-- public-class-method-details -->
<div id="public-instance-method-details" class="method-section section">
<h3 class="section-header">Public Instance Methods</h3>
<div id="3D-3D-method" class="method-detail"><a name="method-i-3D-3D" id="method-i-3D-3D"></a>
<div class="method-heading"><span class="method-name">==</span><span class="method-args">(other)</span> <span class="method-click-advice">click to toggle source</span></div>
<div class="method-description">
<p>Equivalency. Only works for comparing two Statements</p>
<div class="method-source-code" id="3D-3D-source">
<pre>
<span class="ruby-comment"># File rdf/redland/statement.rb, line 140</span>
<span class="ruby-keyword">def</span> <span class="ruby-operator">==</span>(<span class="ruby-identifier">other</span>)
<span class="ruby-keyword">return</span> (<span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_statement_equals</span>(<span class="ruby-keyword">self</span>.<span class="ruby-identifier">statement</span>,<span class="ruby-identifier">other</span>.<span class="ruby-identifier">statement</span>) <span class="ruby-operator">!=</span> <span class="ruby-value">0</span>)
<span class="ruby-keyword">end</span>
</pre></div>
<!-- 3D-3D-source --></div>
</div>
<!-- 3D-3D-method -->
<div id="object-method" class="method-detail"><a name="method-i-object" id="method-i-object"></a>
<div class="method-heading"><span class="method-name">object</span><span class="method-args">()</span> <span class="method-click-advice">click to toggle source</span></div>
<div class="method-description">
<p>return the object of the statement triple. The return value is either a <a href="Literal.html">Literal</a> or <a href="Resource.html">Resource</a> depending if object returned from the store is literal or not</p>
<div class="method-source-code" id="object-source">
<pre>
<span class="ruby-comment"># File rdf/redland/statement.rb, line 94</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">object</span>()
<span class="ruby-identifier">object_node</span> = <span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_statement_get_object</span>(<span class="ruby-keyword">self</span>.<span class="ruby-identifier">statement</span>)
<span class="ruby-keyword">return</span> <span class="ruby-constant">Literal</span>.<span class="ruby-identifier">from_node</span>(<span class="ruby-identifier">object_node</span>) <span class="ruby-keyword">if</span> <span class="ruby-identifier">is_literal?</span>(<span class="ruby-identifier">object_node</span>)
<span class="ruby-keyword">return</span> <span class="ruby-constant">Resource</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">object_node</span>,<span class="ruby-ivar">@model</span>)
<span class="ruby-keyword">end</span>
</pre></div>
<!-- object-source --></div>
</div>
<!-- object-method -->
<div id="object-3D-method" class="method-detail"><a name="method-i-object-3D" id="method-i-object-3D"></a>
<div class="method-heading"><span class="method-name">object=</span><span class="method-args">(value)</span> <span class="method-click-advice">click to toggle source</span></div>
<div class="method-description">
<p>set the object of the statement</p>
<div class="method-source-code" id="object-3D-source">
<pre>
<span class="ruby-comment"># File rdf/redland/statement.rb, line 111</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">object=</span>(<span class="ruby-identifier">value</span>)
<span class="ruby-keyword">if</span> <span class="ruby-identifier">value</span>
<span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_statement_set_object</span>(<span class="ruby-keyword">self</span>.<span class="ruby-identifier">statement</span>,
<span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_new_node_from_node</span>(<span class="ruby-identifier">value</span>.<span class="ruby-identifier">node</span>))
<span class="ruby-keyword">else</span>
<span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_statement_set_object</span>(<span class="ruby-keyword">self</span>.<span class="ruby-identifier">statement</span>, <span class="ruby-keyword">nil</span>)
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span>
</pre></div>
<!-- object-3D-source --></div>
</div>
<!-- object-3D-method -->
<div id="predicate-method" class="method-detail"><a name="method-i-predicate" id="method-i-predicate"></a>
<div class="method-heading"><span class="method-name">predicate</span><span class="method-args">()</span> <span class="method-click-advice">click to toggle source</span></div>
<div class="method-description">
<p>return the predicate of the statement triple.</p>
<div class="method-source-code" id="predicate-source">
<pre>
<span class="ruby-comment"># File rdf/redland/statement.rb, line 87</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">predicate</span>()
<span class="ruby-keyword">return</span> <span class="ruby-identifier">wrap_node</span>(<span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_statement_get_predicate</span>(<span class="ruby-keyword">self</span>.<span class="ruby-identifier">statement</span>))
<span class="ruby-keyword">end</span>
</pre></div>
<!-- predicate-source --></div>
</div>
<!-- predicate-method -->
<div id="predicate-3D-method" class="method-detail"><a name="method-i-predicate-3D" id="method-i-predicate-3D"></a>
<div class="method-heading"><span class="method-name">predicate=</span><span class="method-args">(value)</span> <span class="method-click-advice">click to toggle source</span></div>
<div class="method-description">
<p>set the predicate of the statement</p>
<div class="method-source-code" id="predicate-3D-source">
<pre>
<span class="ruby-comment"># File rdf/redland/statement.rb, line 121</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">predicate=</span>(<span class="ruby-identifier">value</span>)
<span class="ruby-keyword">if</span> <span class="ruby-identifier">value</span>
<span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_statement_set_predicate</span>(<span class="ruby-keyword">self</span>.<span class="ruby-identifier">statement</span>,
<span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_new_node_from_node</span>(<span class="ruby-identifier">value</span>.<span class="ruby-identifier">node</span>))
<span class="ruby-keyword">else</span>
<span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_statement_set_predicate</span>(<span class="ruby-keyword">self</span>.<span class="ruby-identifier">statement</span>, <span class="ruby-keyword">nil</span>)
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span>
</pre></div>
<!-- predicate-3D-source --></div>
</div>
<!-- predicate-3D-method -->
<div id="subject-method" class="method-detail"><a name="method-i-subject" id="method-i-subject"></a>
<div class="method-heading"><span class="method-name">subject</span><span class="method-args">()</span> <span class="method-click-advice">click to toggle source</span></div>
<div class="method-description">
<p>return the subject of the statement triple. The subject is of class <a href="Resource.html">Resource</a></p>
<div class="method-source-code" id="subject-source">
<pre>
<span class="ruby-comment"># File rdf/redland/statement.rb, line 82</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">subject</span>()
<span class="ruby-keyword">return</span> <span class="ruby-constant">Resource</span>.<span class="ruby-identifier">new</span>(<span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_statement_get_subject</span>(<span class="ruby-keyword">self</span>.<span class="ruby-identifier">statement</span>),<span class="ruby-ivar">@model</span>)
<span class="ruby-keyword">end</span>
</pre></div>
<!-- subject-source --></div>
</div>
<!-- subject-method -->
<div id="subject-3D-method" class="method-detail"><a name="method-i-subject-3D" id="method-i-subject-3D"></a>
<div class="method-heading"><span class="method-name">subject=</span><span class="method-args">(value)</span> <span class="method-click-advice">click to toggle source</span></div>
<div class="method-description">
<p>set the subject of the statement</p>
<div class="method-source-code" id="subject-3D-source">
<pre>
<span class="ruby-comment"># File rdf/redland/statement.rb, line 101</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">subject=</span>(<span class="ruby-identifier">value</span>)
<span class="ruby-keyword">if</span> <span class="ruby-identifier">value</span>
<span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_statement_set_subject</span>(<span class="ruby-keyword">self</span>.<span class="ruby-identifier">statement</span>,
<span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_new_node_from_node</span>(<span class="ruby-identifier">value</span>.<span class="ruby-identifier">node</span>))
<span class="ruby-keyword">else</span>
<span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_statement_set_subject</span>(<span class="ruby-keyword">self</span>.<span class="ruby-identifier">statement</span>, <span class="ruby-keyword">nil</span>)
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span>
</pre></div>
<!-- subject-3D-source --></div>
</div>
<!-- subject-3D-method -->
<div id="to_s-method" class="method-detail"><a name="method-i-to_s" id="method-i-to_s"></a>
<div class="method-heading"><span class="method-name">to_s</span><span class="method-args">()</span> <span class="method-click-advice">click to toggle source</span></div>
<div class="method-description">
<p>Convert this <a href="Statement.html">Statement</a> to a string</p>
<div class="method-source-code" id="to_s-source">
<pre>
<span class="ruby-comment"># File rdf/redland/statement.rb, line 131</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">to_s</span>()
<span class="ruby-keyword">unless</span> <span class="ruby-keyword">self</span>.<span class="ruby-identifier">statement</span>
<span class="ruby-identifier">raise</span> <span class="ruby-constant">RedlandError</span>.<span class="ruby-identifier">new</span>(<span class="ruby-string">"Statement is invalid"</span>)
<span class="ruby-keyword">else</span>
<span class="ruby-keyword">return</span> <span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_statement_to_string</span>(<span class="ruby-keyword">self</span>.<span class="ruby-identifier">statement</span>)
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span>
</pre></div>
<!-- to_s-source --></div>
</div>
<!-- to_s-method --></div>
<!-- public-instance-method-details --></div>
<!-- 5Buntitled-5D --></div>
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