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<div class="subTitle">org.jaxen.function</div>
<h2 title="Class NumberFunction" class="title">Class NumberFunction</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
<li>
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<li>org.jaxen.function.NumberFunction</li>
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<pre>public class <span class="typeNameLabel">NumberFunction</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> number(<i>object</i>)</code>
<blockquote src="http://www.w3.org/TR/xpath#function-number">
<p>
The <b>number</b> function converts
its argument to a number as follows:
</p>
<ul>
<li>
<p>
a string that consists of optional whitespace followed by an optional
minus sign followed by a <a href="#NT-Number">Number</a> followed by
whitespace is converted to the IEEE 754 number that is nearest
(according to the IEEE 754 round-to-nearest rule) to the mathematical
value represented by the string; any other string is converted to NaN
</p>
</li>
<li>
<p>
boolean true is converted to 1; boolean false is converted to 0
</p>
</li>
<li>
<p>
a node-set is first converted to a string as if by a call to the <b><a
href="http://www.w3.org/TR/xpath#function-string" target="_top">string</a></b> function and then converted
in the same way as a string argument
</p>
</li>
<li>
<p>
an object of a type other than the four basic types is converted to a
number in a way that is dependent on that type
</p>
</li>
</ul>
<p>
If the argument is omitted, it defaults to a node-set with the
context node as its only member.
</p>
<blockquote> <b>NOTE: </b>The <b>number</b>
function should not be used for conversion of numeric data occurring
in an element in an XML document unless the element is of a type that
represents numeric data in a language-neutral format (which would
typically be transformed into a language-specific format for
presentation to a user). In addition, the <b>number</b> function cannot be used
unless the language-neutral format used by the element is consistent
with the XPath syntax for a <a href="http://www.w3.org/TR/xpath#NT-Number">Number</a>.</blockquote>
</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-number"
target="_top">Section 4.4 of the XPath Specification</a></dd>
</dl>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../org/jaxen/function/NumberFunction.html#NumberFunction--">NumberFunction</a></span>()</code>
<div class="block">Create a new <code>NumberFunction</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/NumberFunction.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 number value of <code>args.get(0)</code>,
or the number value of the context node if <code>args</code>
is empty.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>static java.lang.Double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/jaxen/function/NumberFunction.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 number value of <code>obj</code>.</div>
</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/jaxen/function/NumberFunction.html#isNaN-double-">isNaN</a></span>(double val)</code>
<div class="block">Determines whether the argument is not a number (NaN) as defined
by IEEE 754.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/jaxen/function/NumberFunction.html#isNaN-java.lang.Double-">isNaN</a></span>(java.lang.Double val)</code>
<div class="block">Determines whether the argument is not a number (NaN) as defined
by IEEE 754.</div>
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<h3>Methods inherited from class java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<h4>NumberFunction</h4>
<pre>public NumberFunction()</pre>
<div class="block">Create a new <code>NumberFunction</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 number value of <code>args.get(0)</code>,
or the number value of the context node if <code>args</code>
is empty.</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 containing the single item to be converted to a
<code>Double</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a <code>Double</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 than one item</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)</pre>
<div class="block">Returns the number value of <code>obj</code>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>obj</code> - the object to be converted to a number</dd>
<dd><code>nav</code> - the <code>Navigator</code> used to calculate the string-value
of node-sets</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a <code>Double</code></dd>
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<pre>public static boolean isNaN(double val)</pre>
<div class="block">Determines whether the argument is not a number (NaN) as defined
by IEEE 754.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>val</code> - the double to test</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the value is NaN, false otherwise</dd>
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<pre>public static boolean isNaN(java.lang.Double val)</pre>
<div class="block">Determines whether the argument is not a number (NaN) as defined
by IEEE 754.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>val</code> - the <code>Double</code> to test</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the value is NaN, false otherwise</dd>
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