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XPathFactory
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SUMMARY: NESTED | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD>
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javax.xml.xpath</FONT>
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Class XPathFactory</H2>
<PRE>
java.lang.Object
<IMG SRC="../../../resources/inherit.gif" ALT="extended by"><B>javax.xml.xpath.XPathFactory</B>
</PRE>
<HR>
<DL>
<DT>public abstract class <B>XPathFactory</B><DT>extends java.lang.Object</DL>
<P>
<p>An <code>XPathFactory</code> instance can be used to create
<A HREF="../../../javax/xml/xpath/XPath.html" title="interface in javax.xml.xpath"><CODE>XPath</CODE></A> objects.</p>
<p>See <A HREF="../../../javax/xml/xpath/XPathFactory.html#newInstance(java.lang.String)"><CODE>newInstance(String uri)</CODE></A> for lookup mechanism.</p>
<P>
<P>
<DL>
<DT><B>Since:</B></DT>
<DD>1.5</DD>
</DL>
<HR>
<P>
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<CODE>static java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/xml/xpath/XPathFactory.html#DEFAULT_OBJECT_MODEL_URI">DEFAULT_OBJECT_MODEL_URI</A></B></CODE>
<BR>
Default Object Model URI.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/xml/xpath/XPathFactory.html#DEFAULT_PROPERTY_NAME">DEFAULT_PROPERTY_NAME</A></B></CODE>
<BR>
The default property name according to the JAXP spec.</TD>
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<CODE>protected </CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/xml/xpath/XPathFactory.html#XPathFactory()">XPathFactory</A></B>()</CODE>
<BR>
Protected constructor as <A HREF="../../../javax/xml/xpath/XPathFactory.html#newInstance()"><CODE>newInstance()</CODE></A> or <A HREF="../../../javax/xml/xpath/XPathFactory.html#newInstance(java.lang.String)"><CODE>newInstance(String uri)</CODE></A>
should be used to create a new instance of an <code>XPathFactory</code>.</TD>
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<CODE>abstract boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/xml/xpath/XPathFactory.html#getFeature(java.lang.String)">getFeature</A></B>(java.lang.String name)</CODE>
<BR>
Get the state of the named feature.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>abstract boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/xml/xpath/XPathFactory.html#isObjectModelSupported(java.lang.String)">isObjectModelSupported</A></B>(java.lang.String objectModel)</CODE>
<BR>
Is specified object model supported by this <code>XPathFactory</code>?</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="../../../javax/xml/xpath/XPathFactory.html" title="class in javax.xml.xpath">XPathFactory</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/xml/xpath/XPathFactory.html#newInstance()">newInstance</A></B>()</CODE>
<BR>
Get a new <code>XPathFactory</code> instance using the default object model,
<A HREF="../../../javax/xml/xpath/XPathFactory.html#DEFAULT_OBJECT_MODEL_URI"><CODE>DEFAULT_OBJECT_MODEL_URI</CODE></A>,
the W3C DOM.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="../../../javax/xml/xpath/XPathFactory.html" title="class in javax.xml.xpath">XPathFactory</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/xml/xpath/XPathFactory.html#newInstance(java.lang.String)">newInstance</A></B>(java.lang.String uri)</CODE>
<BR>
Get a new <code>XPathFactory</code> instance using the specified object model.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>abstract <A HREF="../../../javax/xml/xpath/XPath.html" title="interface in javax.xml.xpath">XPath</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/xml/xpath/XPathFactory.html#newXPath()">newXPath</A></B>()</CODE>
<BR>
Return a new <code>XPath</code> using the underlying object
model determined when the <code>XPathFactory</code> was instantiated.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>abstract void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/xml/xpath/XPathFactory.html#setFeature(java.lang.String, boolean)">setFeature</A></B>(java.lang.String name,
boolean value)</CODE>
<BR>
Set a feature for this <code>XPathFactory</code> and <code>XPath</code>s created by this factory.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>abstract void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/xml/xpath/XPathFactory.html#setXPathFunctionResolver(javax.xml.xpath.XPathFunctionResolver)">setXPathFunctionResolver</A></B>(<A HREF="../../../javax/xml/xpath/XPathFunctionResolver.html" title="interface in javax.xml.xpath">XPathFunctionResolver</A> resolver)</CODE>
<BR>
Establish a default function resolver.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>abstract void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/xml/xpath/XPathFactory.html#setXPathVariableResolver(javax.xml.xpath.XPathVariableResolver)">setXPathVariableResolver</A></B>(<A HREF="../../../javax/xml/xpath/XPathVariableResolver.html" title="interface in javax.xml.xpath">XPathVariableResolver</A> resolver)</CODE>
<BR>
Establish a default variable resolver.</TD>
</TR>
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<TD><B>Methods inherited from class java.lang.Object</B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
</TR>
</TABLE>
<P>
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<B>Field Detail</B></FONT></TD>
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</TABLE>
<A NAME="DEFAULT_PROPERTY_NAME"><!-- --></A><H3>
DEFAULT_PROPERTY_NAME</H3>
<PRE>
public static final java.lang.String <B>DEFAULT_PROPERTY_NAME</B></PRE>
<DL>
<DD><p>The default property name according to the JAXP spec.</p>
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../constant-values.html#javax.xml.xpath.XPathFactory.DEFAULT_PROPERTY_NAME">Constant Field Values</A></DL>
</DL>
<HR>
<A NAME="DEFAULT_OBJECT_MODEL_URI"><!-- --></A><H3>
DEFAULT_OBJECT_MODEL_URI</H3>
<PRE>
public static final java.lang.String <B>DEFAULT_OBJECT_MODEL_URI</B></PRE>
<DL>
<DD><p>Default Object Model URI.</p>
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../constant-values.html#javax.xml.xpath.XPathFactory.DEFAULT_OBJECT_MODEL_URI">Constant Field Values</A></DL>
</DL>
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<A NAME="constructor_detail"><!-- --></A>
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<B>Constructor Detail</B></FONT></TD>
</TR>
</TABLE>
<A NAME="XPathFactory()"><!-- --></A><H3>
XPathFactory</H3>
<PRE>
protected <B>XPathFactory</B>()</PRE>
<DL>
<DD><p>Protected constructor as <A HREF="../../../javax/xml/xpath/XPathFactory.html#newInstance()"><CODE>newInstance()</CODE></A> or <A HREF="../../../javax/xml/xpath/XPathFactory.html#newInstance(java.lang.String)"><CODE>newInstance(String uri)</CODE></A>
should be used to create a new instance of an <code>XPathFactory</code>.</p>
<P>
</DL>
<!-- ============ METHOD DETAIL ========== -->
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<A NAME="newInstance()"><!-- --></A><H3>
newInstance</H3>
<PRE>
public static final <A HREF="../../../javax/xml/xpath/XPathFactory.html" title="class in javax.xml.xpath">XPathFactory</A> <B>newInstance</B>()</PRE>
<DL>
<DD><p>Get a new <code>XPathFactory</code> instance using the default object model,
<A HREF="../../../javax/xml/xpath/XPathFactory.html#DEFAULT_OBJECT_MODEL_URI"><CODE>DEFAULT_OBJECT_MODEL_URI</CODE></A>,
the W3C DOM.</p>
<p>This method is functionally equivalent to:</p>
<pre>
newInstance(DEFAULT_OBJECT_MODEL_URI)
</pre>
<p>Since the implementation for the W3C DOM is always available, this method will never fail.</p>
<P>
<DD><DL>
<DT><B>Returns:</B><DD>Instance of an <code>XPathFactory</code>.</DL>
</DD>
</DL>
<HR>
<A NAME="newInstance(java.lang.String)"><!-- --></A><H3>
newInstance</H3>
<PRE>
public static final <A HREF="../../../javax/xml/xpath/XPathFactory.html" title="class in javax.xml.xpath">XPathFactory</A> <B>newInstance</B>(java.lang.String uri)
throws <A HREF="../../../javax/xml/xpath/XPathFactoryConfigurationException.html" title="class in javax.xml.xpath">XPathFactoryConfigurationException</A></PRE>
<DL>
<DD><p>Get a new <code>XPathFactory</code> instance using the specified object model.</p>
<p>To find a <code>XPathFactory</code> object,
this method looks the following places in the following order where "the class loader" refers to the context class loader:</p>
<ol>
<li>
If the system property <A HREF="../../../javax/xml/xpath/XPathFactory.html#DEFAULT_PROPERTY_NAME"><CODE>DEFAULT_PROPERTY_NAME</CODE></A> + ":uri" is present,
where uri is the parameter to this method, then its value is read as a class name.
The method will try to create a new instance of this class by using the class loader,
and returns it if it is successfully created.
</li>
<li>
${java.home}/lib/jaxp.properties is read and the value associated with the key being the system property above is looked for.
If present, the value is processed just like above.
</li>
<li>
The class loader is asked for service provider provider-configuration files matching <code>javax.xml.xpath.XPathFactory</code>
in the resource directory META-INF/services.
See the JAR File Specification for file format and parsing rules.
Each potential service provider is required to implement the method:
<pre>
<A HREF="../../../javax/xml/xpath/XPathFactory.html#isObjectModelSupported(java.lang.String)"><CODE>isObjectModelSupported(String objectModel)</CODE></A>
</pre>
The first service provider found in class loader order that supports the specified object model is returned.
</li>
<li>
Platform default <code>XPathFactory</code> is located in a platform specific way.
There must be a platform default XPathFactory for the W3C DOM, i.e. <A HREF="../../../javax/xml/xpath/XPathFactory.html#DEFAULT_OBJECT_MODEL_URI"><CODE>DEFAULT_OBJECT_MODEL_URI</CODE></A>.
</li>
</ol>
<p>If everything fails, an <code>XPathFactoryConfigurationException</code> will be thrown.</p>
<p>Tip for Trouble-shooting:</p>
<p>See <CODE>Properties.load(java.io.InputStream)</CODE> for exactly how a property file is parsed.
In particular, colons ':' need to be escaped in a property file, so make sure the URIs are properly escaped in it.
For example:</p>
<pre>
http\://java.sun.com/jaxp/xpath/dom=org.acme.DomXPathFactory
</pre>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>uri</CODE> - Identifies the underlying object model.
The specification only defines the URI <A HREF="../../../javax/xml/xpath/XPathFactory.html#DEFAULT_OBJECT_MODEL_URI"><CODE>DEFAULT_OBJECT_MODEL_URI</CODE></A>,
<code>http://java.sun.com/jaxp/xpath/dom</code> for the W3C DOM,
the org.w3c.dom package, and implementations are free to introduce other URIs for other object models.
<DT><B>Returns:</B><DD>Instance of an <code>XPathFactory</code>.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../javax/xml/xpath/XPathFactoryConfigurationException.html" title="class in javax.xml.xpath">XPathFactoryConfigurationException</A></CODE> - If the specified object model is unavailable.
<DD><CODE>java.lang.NullPointerException</CODE> - If <code>uri</code> is <code>null</code>.
<DD><CODE>java.lang.IllegalArgumentException</CODE> - If <code>uri.length() == 0</code>.</DL>
</DD>
</DL>
<HR>
<A NAME="isObjectModelSupported(java.lang.String)"><!-- --></A><H3>
isObjectModelSupported</H3>
<PRE>
public abstract boolean <B>isObjectModelSupported</B>(java.lang.String objectModel)</PRE>
<DL>
<DD><p>Is specified object model supported by this <code>XPathFactory</code>?</p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>objectModel</CODE> - Specifies the object model which the returned <code>XPathFactory</code> will understand.
<DT><B>Returns:</B><DD><code>true</code> if <code>XPathFactory</code> supports <code>objectModel</code>, else <code>false</code>.
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - If <code>objectModel</code> is <code>null</code>.
<DD><CODE>java.lang.IllegalArgumentException</CODE> - If <code>objectModel.length() == 0</code>.</DL>
</DD>
</DL>
<HR>
<A NAME="setFeature(java.lang.String, boolean)"><!-- --></A><H3>
setFeature</H3>
<PRE>
public abstract void <B>setFeature</B>(java.lang.String name,
boolean value)
throws <A HREF="../../../javax/xml/xpath/XPathFactoryConfigurationException.html" title="class in javax.xml.xpath">XPathFactoryConfigurationException</A></PRE>
<DL>
<DD><p>Set a feature for this <code>XPathFactory</code> and <code>XPath</code>s created by this factory.</p>
<p>
Feature names are fully qualified <CODE>URI</CODE>s.
Implementations may define their own features.
An <A HREF="../../../javax/xml/xpath/XPathFactoryConfigurationException.html" title="class in javax.xml.xpath"><CODE>XPathFactoryConfigurationException</CODE></A> is thrown if this <code>XPathFactory</code> or the <code>XPath</code>s
it creates cannot support the feature.
It is possible for an <code>XPathFactory</code> to expose a feature value but be unable to change its state.
</p>
<p>
All implementations are required to support the <A HREF="../../../javax/xml/XMLConstants.html#FEATURE_SECURE_PROCESSING"><CODE>XMLConstants.FEATURE_SECURE_PROCESSING</CODE></A> feature.
When the feature is <code>true</code>, any reference to an external function is an error.
Under these conditions, the implementation must not call the <A HREF="../../../javax/xml/xpath/XPathFunctionResolver.html" title="interface in javax.xml.xpath"><CODE>XPathFunctionResolver</CODE></A>
and must throw an <A HREF="../../../javax/xml/xpath/XPathFunctionException.html" title="class in javax.xml.xpath"><CODE>XPathFunctionException</CODE></A>.
</p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - Feature name.<DD><CODE>value</CODE> - Is feature state <code>true</code> or <code>false</code>.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../javax/xml/xpath/XPathFactoryConfigurationException.html" title="class in javax.xml.xpath">XPathFactoryConfigurationException</A></CODE> - if this <code>XPathFactory</code> or the <code>XPath</code>s
it creates cannot support this feature.
<DD><CODE>java.lang.NullPointerException</CODE> - if <code>name</code> is <code>null</code>.</DL>
</DD>
</DL>
<HR>
<A NAME="getFeature(java.lang.String)"><!-- --></A><H3>
getFeature</H3>
<PRE>
public abstract boolean <B>getFeature</B>(java.lang.String name)
throws <A HREF="../../../javax/xml/xpath/XPathFactoryConfigurationException.html" title="class in javax.xml.xpath">XPathFactoryConfigurationException</A></PRE>
<DL>
<DD><p>Get the state of the named feature.</p>
<p>
Feature names are fully qualified <CODE>URI</CODE>s.
Implementations may define their own features.
An <A HREF="../../../javax/xml/xpath/XPathFactoryConfigurationException.html" title="class in javax.xml.xpath"><CODE>XPathFactoryConfigurationException</CODE></A> is thrown if this <code>XPathFactory</code> or the <code>XPath</code>s
it creates cannot support the feature.
It is possible for an <code>XPathFactory</code> to expose a feature value but be unable to change its state.
</p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - Feature name.
<DT><B>Returns:</B><DD>State of the named feature.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../javax/xml/xpath/XPathFactoryConfigurationException.html" title="class in javax.xml.xpath">XPathFactoryConfigurationException</A></CODE> - if this <code>XPathFactory</code> or the <code>XPath</code>s
it creates cannot support this feature.
<DD><CODE>java.lang.NullPointerException</CODE> - if <code>name</code> is <code>null</code>.</DL>
</DD>
</DL>
<HR>
<A NAME="setXPathVariableResolver(javax.xml.xpath.XPathVariableResolver)"><!-- --></A><H3>
setXPathVariableResolver</H3>
<PRE>
public abstract void <B>setXPathVariableResolver</B>(<A HREF="../../../javax/xml/xpath/XPathVariableResolver.html" title="interface in javax.xml.xpath">XPathVariableResolver</A> resolver)</PRE>
<DL>
<DD><p>Establish a default variable resolver.</p>
<p>Any <code>XPath</code> objects constructed from this factory will use
the specified resolver by default.</p>
<p>A <code>NullPointerException</code> is thrown if <code>resolver</code> is <code>null</code>.</p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>resolver</CODE> - Variable resolver.
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - If <code>resolver</code> is <code>null</code>.</DL>
</DD>
</DL>
<HR>
<A NAME="setXPathFunctionResolver(javax.xml.xpath.XPathFunctionResolver)"><!-- --></A><H3>
setXPathFunctionResolver</H3>
<PRE>
public abstract void <B>setXPathFunctionResolver</B>(<A HREF="../../../javax/xml/xpath/XPathFunctionResolver.html" title="interface in javax.xml.xpath">XPathFunctionResolver</A> resolver)</PRE>
<DL>
<DD><p>Establish a default function resolver.</p>
<p>Any <code>XPath</code> objects constructed from this factory will use
the specified resolver by default.</p>
<p>A <code>NullPointerException</code> is thrown if <code>resolver</code> is <code>null</code>.</p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>resolver</CODE> - XPath function resolver.
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - If <code>resolver</code> is <code>null</code>.</DL>
</DD>
</DL>
<HR>
<A NAME="newXPath()"><!-- --></A><H3>
newXPath</H3>
<PRE>
public abstract <A HREF="../../../javax/xml/xpath/XPath.html" title="interface in javax.xml.xpath">XPath</A> <B>newXPath</B>()</PRE>
<DL>
<DD><p>Return a new <code>XPath</code> using the underlying object
model determined when the <code>XPathFactory</code> was instantiated.</p>
<P>
<DD><DL>
<DT><B>Returns:</B><DD>New instance of an <code>XPath</code>.</DL>
</DD>
</DL>
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