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<h2 title="Class SumFunction" class="title">Class SumFunction</h2>
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<li>java.lang.Object</li>
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<li>org.jaxen.function.SumFunction</li>
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<pre>public class <span class="typeNameLabel">SumFunction</span>
extends java.lang.Object
implements <a href="../../../org/jaxen/Function.html" title="interface in org.jaxen">Function</a></pre>
<div class="block"><p><b>4.4</b> <code><i>number</i> sum(<i>node-set</i>)</code> </p>
<blockquote src="http://www.w3.org/TR/xpath#function-sum">
The sum function returns the sum, for each node in the argument node-set,
of the result of converting the string-values of the node to a number.
</blockquote></div>
<dl>
<dt><span class="simpleTagLabel">Author:</span></dt>
<dd>bob mcwhirter (bob @ werken.com)</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="http://www.w3.org/TR/xpath#function-sum" target="_top">Section 4.4 of the XPath Specification</a></dd>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../org/jaxen/function/SumFunction.html#SumFunction--">SumFunction</a></span>()</code>
<div class="block">Create a new <code>SumFunction</code> object.</div>
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<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/jaxen/function/SumFunction.html#call-org.jaxen.Context-java.util.List-">call</a></span>(<a href="../../../org/jaxen/Context.html" title="class in org.jaxen">Context</a> context,
java.util.List args)</code>
<div class="block">Returns the sum of its arguments.</div>
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<td class="colFirst"><code>static java.lang.Double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/jaxen/function/SumFunction.html#evaluate-java.lang.Object-org.jaxen.Navigator-">evaluate</a></span>(java.lang.Object obj,
<a href="../../../org/jaxen/Navigator.html" title="interface in org.jaxen">Navigator</a> nav)</code>
<div class="block">Returns the sum of the items in a list.</div>
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<pre>public SumFunction()</pre>
<div class="block">Create a new <code>SumFunction</code> object.</div>
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<h4>call</h4>
<pre>public java.lang.Object call(<a href="../../../org/jaxen/Context.html" title="class in org.jaxen">Context</a> context,
java.util.List args)
throws <a href="../../../org/jaxen/FunctionCallException.html" title="class in org.jaxen">FunctionCallException</a></pre>
<div class="block">Returns the sum of its arguments.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../org/jaxen/Function.html#call-org.jaxen.Context-java.util.List-">call</a></code> in interface <code><a href="../../../org/jaxen/Function.html" title="interface in org.jaxen">Function</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>context</code> - the context at the point in the
expression when the function is called</dd>
<dd><code>args</code> - a list that contains exactly one item, also a <code>List</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a <code>Double</code> containing the sum of the items in <code>args.get(0)</code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../org/jaxen/FunctionCallException.html" title="class in org.jaxen">FunctionCallException</a></code> - if <code>args</code> has more or less than one item;
or if the first argument is not a <code>List</code></dd>
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<h4>evaluate</h4>
<pre>public static java.lang.Double evaluate(java.lang.Object obj,
<a href="../../../org/jaxen/Navigator.html" title="interface in org.jaxen">Navigator</a> nav)
throws <a href="../../../org/jaxen/FunctionCallException.html" title="class in org.jaxen">FunctionCallException</a></pre>
<div class="block">Returns the sum of the items in a list.
If necessary, each item in the list is first converted to a <code>Double</code>
as if by the XPath <code>number()</code> function.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>obj</code> - a <code>List</code> of numbers to be summed</dd>
<dd><code>nav</code> - ignored</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the sum of the list</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../org/jaxen/FunctionCallException.html" title="class in org.jaxen">FunctionCallException</a></code> - if <code>obj</code> is not a <code>List</code></dd>
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