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<h1 class="class">Redland::NodeIterator</h1>
<div id="description" class="description">
<p>The iterator provides a generic way to receive a sequence of values (order may or may not be import) from objects, usually generated on demand.</p>
</div>
<!-- description -->
<div id="5Buntitled-5D" class="documentation-section"><!-- 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">(iterator)</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/stream.rb, line 114</span>
<span class="ruby-keyword">def</span> <span class="ruby-constant">NodeIterator</span>.<span class="ruby-identifier">create_finalizer</span>(<span class="ruby-identifier">iterator</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-comment"># "Finalizer on #{id}"</span>
<span class="ruby-comment">#puts "closing iterator"</span>
<span class="ruby-constant">Redland</span><span class="ruby-operator">::</span><span class="ruby-identifier">librdf_free_iterator</span>(<span class="ruby-identifier">iterator</span>)
}
<span class="ruby-keyword">end</span>
</pre></div>
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<div id="new-method" class="method-detail"><a name="method-c-new" id="method-c-new"></a>
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<div class="method-description">
<div class="method-source-code" id="new-source">
<pre>
<span class="ruby-comment"># File rdf/redland/stream.rb, line 82</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">initialize</span>(<span class="ruby-identifier">object</span>,<span class="ruby-identifier">model</span>=<span class="ruby-keyword">nil</span>,<span class="ruby-identifier">creator2</span>=<span class="ruby-keyword">nil</span>,<span class="ruby-identifier">creator3</span>=<span class="ruby-keyword">nil</span>)
<span class="ruby-ivar">@iterator</span> = <span class="ruby-identifier">object</span>
<span class="ruby-ivar">@model</span> = <span class="ruby-identifier">model</span>
<span class="ruby-ivar">@creator2</span> = <span class="ruby-identifier">creator2</span>
<span class="ruby-ivar">@creator3</span> = <span class="ruby-identifier">creator3</span>
<span class="ruby-comment"># Test if the iterator has finished</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">end?</span>()
<span class="ruby-keyword">return</span> (<span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_iterator_end</span>(<span class="ruby-ivar">@iterator</span>) <span class="ruby-operator">!=</span> <span class="ruby-value">0</span>)
<span class="ruby-keyword">end</span>
<span class="ruby-comment"># Get the current object from the iterator</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">current</span>
<span class="ruby-identifier">my_node</span> = <span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_iterator_get_object</span>(<span class="ruby-ivar">@iterator</span>)
<span class="ruby-keyword">if</span> <span class="ruby-identifier">my_node</span> <span class="ruby-operator">==</span> <span class="ruby-string">"NULL"</span> <span class="ruby-keyword">or</span> <span class="ruby-identifier">my_node</span> <span class="ruby-operator">==</span> <span class="ruby-keyword">nil</span>
<span class="ruby-keyword">return</span> <span class="ruby-keyword">nil</span>
<span class="ruby-keyword">elsif</span> <span class="ruby-identifier">is_literal?</span>(<span class="ruby-identifier">my_node</span>)
<span class="ruby-keyword">return</span> <span class="ruby-constant">Literal</span>.<span class="ruby-identifier">from_node</span>(<span class="ruby-identifier">my_node</span>)
<span class="ruby-keyword">else</span>
<span class="ruby-keyword">return</span> <span class="ruby-constant">Resource</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">my_node</span>,<span class="ruby-ivar">@model</span>)
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span>
<span class="ruby-comment"># Move to the next iterator element</span>
<span class="ruby-keyword">def</span> <span class="ruby-keyword">next</span>()
<span class="ruby-identifier">my_node</span>=<span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_iterator_next</span>(<span class="ruby-ivar">@iterator</span>)
<span class="ruby-keyword">end</span>
<span class="ruby-constant">ObjectSpace</span>.<span class="ruby-identifier">define_finalizer</span>(<span class="ruby-keyword">self</span>,<span class="ruby-constant">NodeIterator</span>.<span class="ruby-identifier">create_finalizer</span>(<span class="ruby-ivar">@iterator</span>))
<span class="ruby-keyword">end</span>
</pre></div>
<!-- new-source --></div>
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<!-- new-method --></div>
<!-- public-class-method-details -->
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<h3 class="section-header">Public Instance Methods</h3>
<div id="current-method" class="method-detail"><a name="method-i-current" id="method-i-current"></a>
<div class="method-heading"><span class="method-name">current</span><span class="method-args">()</span> <span class="method-click-advice">click to toggle source</span></div>
<div class="method-description">
<p>Get the current object from the iterator</p>
<div class="method-source-code" id="current-source">
<pre>
<span class="ruby-comment"># File rdf/redland/stream.rb, line 94</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">current</span>
<span class="ruby-identifier">my_node</span> = <span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_iterator_get_object</span>(<span class="ruby-ivar">@iterator</span>)
<span class="ruby-keyword">if</span> <span class="ruby-identifier">my_node</span> <span class="ruby-operator">==</span> <span class="ruby-string">"NULL"</span> <span class="ruby-keyword">or</span> <span class="ruby-identifier">my_node</span> <span class="ruby-operator">==</span> <span class="ruby-keyword">nil</span>
<span class="ruby-keyword">return</span> <span class="ruby-keyword">nil</span>
<span class="ruby-keyword">elsif</span> <span class="ruby-identifier">is_literal?</span>(<span class="ruby-identifier">my_node</span>)
<span class="ruby-keyword">return</span> <span class="ruby-constant">Literal</span>.<span class="ruby-identifier">from_node</span>(<span class="ruby-identifier">my_node</span>)
<span class="ruby-keyword">else</span>
<span class="ruby-keyword">return</span> <span class="ruby-constant">Resource</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">my_node</span>,<span class="ruby-ivar">@model</span>)
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span>
</pre></div>
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<div id="end-3F-method" class="method-detail"><a name="method-i-end-3F" id="method-i-end-3F"></a>
<div class="method-heading"><span class="method-name">end?</span><span class="method-args">()</span> <span class="method-click-advice">click to toggle source</span></div>
<div class="method-description">
<p>Test if the iterator has finished</p>
<div class="method-source-code" id="end-3F-source">
<pre>
<span class="ruby-comment"># File rdf/redland/stream.rb, line 89</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">end?</span>()
<span class="ruby-keyword">return</span> (<span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_iterator_end</span>(<span class="ruby-ivar">@iterator</span>) <span class="ruby-operator">!=</span> <span class="ruby-value">0</span>)
<span class="ruby-keyword">end</span>
</pre></div>
<!-- end-3F-source --></div>
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<!-- end-3F-method -->
<div id="next-method" class="method-detail"><a name="method-i-next" id="method-i-next"></a>
<div class="method-heading"><span class="method-name">next</span><span class="method-args">()</span> <span class="method-click-advice">click to toggle source</span></div>
<div class="method-description">
<p>Move to the next iterator element</p>
<div class="method-source-code" id="next-source">
<pre>
<span class="ruby-comment"># File rdf/redland/stream.rb, line 106</span>
<span class="ruby-keyword">def</span> <span class="ruby-keyword">next</span>()
<span class="ruby-identifier">my_node</span>=<span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_iterator_next</span>(<span class="ruby-ivar">@iterator</span>)
<span class="ruby-keyword">end</span>
</pre></div>
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