uTools-Manuals/docs/java/javax/xml/xpath/XPathVariableResolver.html

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     javax.xml.xpath 
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<h2 class="title" title="Interface XPathVariableResolver">Interface XPathVariableResolver</h2>
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<hr/> <br/> <pre>public interface <span class="typeNameLabel">XPathVariableResolver</span></pre>
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<p> <span><code>XPathVariableResolver</code>提供对用户定义的XPath变量集的访问。</span> </p>
<p> <span><code>XPathVariableResolver</code>和XPath评估程序必须遵守不能由API直接实施的合同。</span> <span>虽然变量可以是可变的，即，一个应用程序可能希望评估相同的XPath表达式不止一次具有不同的变量值，在评价任何单个XPath表达式的过程中，一个变量的值<strong><em>不能</em></strong>改变。</span> </p>
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<span class="simpleTagLabel">从以下版本开始：</span>
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         1.5 
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<td class="colFirst"><code><a href="../../../java/lang/Object.html" title="class in java.lang">Object</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/xml/xpath/XPathVariableResolver.html#resolveVariable-javax.xml.namespace.QName-">resolveVariable</a></span>(<a href="../../../javax/xml/namespace/QName.html" title="class in javax.xml.namespace">QName</a> variableName)</code>
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              在可用变量集中找到一个变量。 
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<li class="blockList"> <h4>resolveVariable</h4> <pre><a href="../../../java/lang/Object.html" title="class in java.lang">Object</a> resolveVariable(<a href="../../../javax/xml/namespace/QName.html" title="class in javax.xml.namespace">QName</a> variableName)</pre>
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<p> <span>在可用变量集中找到一个变量。</span> </p>
<p> <span>如果<code>variableName</code>是<code>null</code> ，那么抛出一个<code>NullPointerException</code> 。</span> </p>
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<span class="paramLabel">参数</span>
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<code>variableName</code> - 变量名称的 
            <code>QName</code> 。 
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<span class="returnLabel">结果</span>
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<span>变量值，或<code>null</code>如果没有名为<code>variableName</code>变量存在。</span>
<span>返回的值必须是适合于底层对象模型的类型。</span>
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<code><a href="../../../java/lang/NullPointerException.html" title="class in java.lang">NullPointerException</a></code> - If 
            <code>variableName</code> is 
            <code>null</code>. 
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