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<h2 title="Interface VariableContext" class="title">Interface VariableContext</h2>
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<dd><a href="../../org/jaxen/SimpleVariableContext.html" title="class in org.jaxen">SimpleVariableContext</a></dd>
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<pre>public interface <span class="typeNameLabel">VariableContext</span></pre>
<div class="block">Resolves variable bindings within an XPath expression.
<p>
Variables within an XPath expression are denoted using
notation such as <code>$varName</code> or
<code>$nsPrefix:varName</code>, and may
refer to a <code>Boolean</code>, <code>Double</code>, <code>String</code>,
node-set (<code>List</code>) or individual XML node.
</p>
<p>
When a variable is bound to a node-set, the
actual Java object returned should be a <code>java.util.List</code>
containing XML nodes from the object-model (e.g. dom4j, JDOM, DOM, etc.)
being used with the XPath.
</p>
<p>
A variable may validly be assigned the <code>null</code> value,
but an unbound variable (one that this context does not know about)
should cause an <a href="../../org/jaxen/UnresolvableException.html" title="class in org.jaxen"><code>UnresolvableException</code></a> to be thrown.
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<p>
Implementations of this interface should implement <code>Serializable</code>.
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<dt><span class="simpleTagLabel">Author:</span></dt>
<dd><a href="mailto:bob@werken.com">bob mcwhirter</a>, <a href="mailto:jstrachan@apache.org">James Strachan</a></dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../org/jaxen/SimpleVariableContext.html" title="class in org.jaxen"><code>SimpleVariableContext</code></a>,
<a href="../../org/jaxen/NamespaceContext.html" title="interface in org.jaxen"><code>NamespaceContext</code></a></dd>
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<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../org/jaxen/VariableContext.html#getVariableValue-java.lang.String-java.lang.String-java.lang.String-">getVariableValue</a></span>(java.lang.String namespaceURI,
java.lang.String prefix,
java.lang.String localName)</code>
<div class="block">An implementation should return the value of an XPath variable
based on the namespace URI and local name of the variable-reference
expression.</div>
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<h4>getVariableValue</h4>
<pre>java.lang.Object getVariableValue(java.lang.String namespaceURI,
java.lang.String prefix,
java.lang.String localName)
throws <a href="../../org/jaxen/UnresolvableException.html" title="class in org.jaxen">UnresolvableException</a></pre>
<div class="block">An implementation should return the value of an XPath variable
based on the namespace URI and local name of the variable-reference
expression.
<p>
It must not use the prefix parameter to select a variable,
because a prefix could be bound to any namespace; the prefix parameter
could be used in debugging output or other generated information.
The prefix may otherwise be ignored.
</p></div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>namespaceURI</code> - the namespace URI to which the prefix parameter
is bound in the XPath expression. If the variable
reference expression had no prefix, the namespace
URI is <code>null</code>.</dd>
<dd><code>prefix</code> - the prefix that was used in the variable reference
expression; this value is ignored and has no effect</dd>
<dd><code>localName</code> - the local name of the variable-reference
expression. If there is no prefix, then this is
the whole name of the variable.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the variable's value (which can be <code>null</code>)</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../org/jaxen/UnresolvableException.html" title="class in org.jaxen">UnresolvableException</a></code> - when the variable cannot be resolved</dd>
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