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

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     javax.xml.xpath 
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<h2 class="title" title="Interface XPathFunctionResolver">Interface XPathFunctionResolver</h2>
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<hr/> <br/> <pre>public interface <span class="typeNameLabel">XPathFunctionResolver</span></pre>
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<p> <span><code>XPathFunctionResolver</code>提供访问一组用户定义的<code>XPathFunction</code>秒。</span> </p>
<p> <span>XPath函数通过名称和空间来解决。</span> <span>XPath内置函数不需要解析器，解析器<strong><em>不能</em></strong>用于覆盖这些函数。</span> </p>
<p> <span>特别地，解析器仅被称为另一命名空间中的函数（具有明确前缀的函数）。</span> <span>这意味着您不能使用<code>XPathFunctionResolver</code>来实现像<a href="http://www.w3.org/TR/xmldsig-core/">XML-Signature Syntax and Processing</a>这样的<a href="http://www.w3.org/TR/xmldsig-core/">规范</a> ，它将XPath 1.0的功能库扩展到相同的命名空间中。</span> <span>这是解析器设计的结果。</span> </p>
<p> <span>如果您希望实现其他内置函数，则必须直接扩展底层实现。</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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<span class="seeLabel">另请参见：</span>
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<a href="http://www.w3.org/TR/xpath#corelib">XML Path Language (XPath) Version 1.0, Core Function Library</a>
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<!-- --> </a> <h3>方法摘要</h3>
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<td class="colFirst"><code><a href="../../../javax/xml/xpath/XPathFunction.html" title="interface in javax.xml.xpath">XPathFunction</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/xml/xpath/XPathFunctionResolver.html#resolveFunction-javax.xml.namespace.QName-int-">resolveFunction</a></span>(<a href="../../../javax/xml/namespace/QName.html" title="class in javax.xml.namespace">QName</a> functionName, int arity)</code>
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              在一组可用函数中查找一个函数。 
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<li class="blockList"> <h4>resolveFunction</h4> <pre><a href="../../../javax/xml/xpath/XPathFunction.html" title="interface in javax.xml.xpath">XPathFunction</a> resolveFunction(<a href="../../../javax/xml/namespace/QName.html" title="class in javax.xml.namespace">QName</a> functionName,
                              int arity)</pre>
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<p> <span>在一组可用函数中查找一个函数。</span> </p>
<p> <span>如果<code>functionName</code>或<code>arity</code>是<code>null</code> ，则抛出一个<code>NullPointerException</code> 。</span> </p>
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<span class="paramLabel">参数</span>
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<code>functionName</code> - 函数名。 
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<code>arity</code> - 返回函数必须接受的参数数。 
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<span class="returnLabel">结果</span>
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             该功能或 
            <code>null</code>如果没有功能命名为 
            <code>functionName</code>与 
            <code>arity</code>参数存在。 
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<span class="throwsLabel">异常</span>
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<code><a href="../../../java/lang/NullPointerException.html" title="class in java.lang">NullPointerException</a></code> - 如果 
            <code>functionName</code>或 
            <code>arity</code>是 
            <code>null</code> 。 
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