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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>Redland RDF Language Bindings - Ruby RDoc - Class: Redland::Query</title>
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<h1 class="class">Redland::Query</h1>
<div id="description" class="description">
<p>This class provides query language support for RDF models either via an adaptor class or direct by persistant storage.</p>
</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="query-attribute-method" class="method-detail"><a name="query" id="query"></a>
<div class="method-heading attribute-method-heading"><span class="method-name">query</span><span class="attribute-access-type">[R]</span></div>
<div class="method-description"></div>
</div>
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<!-- 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">(query)</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/query.rb, line 36</span>
<span class="ruby-keyword">def</span> <span class="ruby-constant">Query</span>.<span class="ruby-identifier">create_finalizer</span>(<span class="ruby-identifier">query</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">#$log_final.info "closing query"</span>
    <span class="ruby-constant">Redland</span><span class="ruby-operator">::</span><span class="ruby-identifier">librdf_free_query</span>(<span class="ruby-identifier">query</span>)
  }
<span class="ruby-keyword">end</span>
</pre></div>
<!-- create_finalizer-source --></div>
</div>
<!-- create_finalizer-method -->
<div id="new-method" class="method-detail"><a name="method-c-new" id="method-c-new"></a>
<div class="method-heading"><span class="method-name">new</span><span class="method-args">(query,language=nil,uri=nil,base_uri=nil)</span> <span class="method-click-advice">click to toggle source</span></div>
<div class="method-description">
<p>Constructor - create a new <a href="Query.html">Query</a> object query - the query string language - the name of the query language uri - the URI identifying the query language</p>
<div class="method-source-code" id="new-source">
<pre>
<span class="ruby-comment"># File rdf/redland/query.rb, line 17</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">initialize</span>(<span class="ruby-identifier">query</span>,<span class="ruby-identifier">language</span>=<span class="ruby-keyword">nil</span>,<span class="ruby-identifier">uri</span>=<span class="ruby-keyword">nil</span>,<span class="ruby-identifier">base_uri</span>=<span class="ruby-keyword">nil</span>)
  <span class="ruby-ivar">@language</span> = <span class="ruby-identifier">language</span>
  <span class="ruby-ivar">@uri</span> = <span class="ruby-identifier">uri</span>
  <span class="ruby-ivar">@query</span> = <span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_new_query</span>(<span class="ruby-identifier">$world</span>.<span class="ruby-identifier">world</span>,<span class="ruby-identifier">language</span>,<span class="ruby-identifier">uri</span>,<span class="ruby-identifier">query</span>,<span class="ruby-identifier">base_uri</span>)
  <span class="ruby-keyword">return</span> <span class="ruby-keyword">nil</span> <span class="ruby-keyword">if</span> <span class="ruby-keyword">not</span> <span class="ruby-ivar">@query</span>
  <span class="ruby-constant">ObjectSpace</span>.<span class="ruby-identifier">define_finalizer</span>(<span class="ruby-keyword">self</span>,<span class="ruby-constant">Query</span>.<span class="ruby-identifier">create_finalizer</span>(<span class="ruby-ivar">@query</span>))
<span class="ruby-keyword">end</span>
</pre></div>
<!-- new-source --></div>
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<!-- 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="execute-method" class="method-detail"><a name="method-i-execute" id="method-i-execute"></a>
<div class="method-heading"><span class="method-name">execute</span><span class="method-args">(model)</span> <span class="method-click-advice">click to toggle source</span></div>
<div class="method-description">
<p>Execute a query on a model</p>
<div class="method-source-code" id="execute-source">
<pre>
<span class="ruby-comment"># File rdf/redland/query.rb, line 26</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">execute</span>(<span class="ruby-identifier">model</span>)
  <span class="ruby-identifier">results</span>=<span class="ruby-constant">Redland</span>.<span class="ruby-identifier">librdf_query_execute</span>(<span class="ruby-ivar">@query</span>,<span class="ruby-identifier">model</span>.<span class="ruby-identifier">model</span>)
  <span class="ruby-keyword">if</span> <span class="ruby-keyword">not</span> <span class="ruby-identifier">results</span>
    <span class="ruby-keyword">return</span> <span class="ruby-keyword">nil</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-keyword">return</span> <span class="ruby-constant">QueryResults</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">results</span>)
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span>
</pre></div>
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