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// $Id: XPathFactoryImpl.java,v 1.11 2010-11-01 04:35:16 joehw Exp $
package com.sun.org.apache.xpath.internal.jaxp;
import com.sun.org.apache.xpath.internal.res.XPATHErrorResources;
import com.sun.org.apache.xalan.internal.res.XSLMessages;
import javax.xml.XMLConstants;
import javax.xml.xpath.XPathFactory;
import javax.xml.xpath.XPathFactoryConfigurationException;
import javax.xml.xpath.XPathFunctionResolver;
import javax.xml.xpath.XPathVariableResolver;
/**
* The XPathFactory builds XPaths.
*
* @version $Revision: 1.11 $
* @author Ramesh Mandava
*/
public class XPathFactoryImpl extends XPathFactory {
/**
* Name of class as a constant to use for debugging.
*/
private static final String CLASS_NAME = "XPathFactoryImpl";
/**
*XPathFunctionResolver for this XPathFactory and created XPaths.
*/
private XPathFunctionResolver xPathFunctionResolver = null;
/**
* XPathVariableResolver for this XPathFactory and created XPaths
*/
private XPathVariableResolver xPathVariableResolver = null;
/**
* State of secure processing feature.
*/
private boolean _isNotSecureProcessing = true;
/**
* State of secure mode.
*/
private boolean _isSecureMode = false;
/**
* javax.xml.xpath.XPathFactory implementation.
*/
public XPathFactoryImpl() {
if (System.getSecurityManager() != null) {
_isSecureMode = true;
_isNotSecureProcessing = false;
}
}
/**
* Is specified object model supported by this
* XPathFactory?
*
* @param objectModel Specifies the object model which the returned
* XPathFactory will understand.
*
* @return true if XPathFactory supports
* objectModel, else false.
*
* @throws NullPointerException If objectModel is null.
* @throws IllegalArgumentException If objectModel.length() == 0.
*/
public boolean isObjectModelSupported(String objectModel) {
if (objectModel == null) {
String fmsg = XSLMessages.createXPATHMessage(
XPATHErrorResources.ER_OBJECT_MODEL_NULL,
new Object[] { this.getClass().getName() } );
throw new NullPointerException( fmsg );
}
if (objectModel.length() == 0) {
String fmsg = XSLMessages.createXPATHMessage(
XPATHErrorResources.ER_OBJECT_MODEL_EMPTY,
new Object[] { this.getClass().getName() } );
throw new IllegalArgumentException( fmsg );
}
// know how to support default object model, W3C DOM
if (objectModel.equals(XPathFactory.DEFAULT_OBJECT_MODEL_URI)) {
return true;
}
// don't know how to support anything else
return false;
}
/**
* Returns a new XPath object using the underlying
* object model determined when the factory was instantiated.
*
* @return New XPath
*/
public javax.xml.xpath.XPath newXPath() {
return new com.sun.org.apache.xpath.internal.jaxp.XPathImpl(
xPathVariableResolver, xPathFunctionResolver,
!_isNotSecureProcessing );
}
/**
* Set a feature for this XPathFactory and
* XPaths created by this factory.
*
*
* Feature names are fully qualified {@link java.net.URI}s.
* Implementations may define their own features.
* An {@link XPathFactoryConfigurationException} is thrown if this
* XPathFactory or the XPaths
* it creates cannot support the feature.
* It is possible for an XPathFactory to expose a feature
* value but be unable to change its state.
*
*
* See {@link javax.xml.xpath.XPathFactory} for full documentation
* of specific features.
*
* @param name Feature name.
* @param value Is feature state true or false.
*
* @throws XPathFactoryConfigurationException if this
* XPathFactory or the XPaths
* it creates cannot support this feature.
* @throws NullPointerException if name is
* null.
*/
public void setFeature(String name, boolean value)
throws XPathFactoryConfigurationException {
// feature name cannot be null
if (name == null) {
String fmsg = XSLMessages.createXPATHMessage(
XPATHErrorResources.ER_FEATURE_NAME_NULL,
new Object[] { CLASS_NAME, new Boolean( value) } );
throw new NullPointerException( fmsg );
}
// secure processing?
if (name.equals(XMLConstants.FEATURE_SECURE_PROCESSING)) {
if ((_isSecureMode) && (!value)) {
String fmsg = XSLMessages.createXPATHMessage(
XPATHErrorResources.ER_SECUREPROCESSING_FEATURE,
new Object[] { name, CLASS_NAME, new Boolean(value) } );
throw new XPathFactoryConfigurationException( fmsg );
}
_isNotSecureProcessing = !value;
// all done processing feature
return;
}
// unknown feature
String fmsg = XSLMessages.createXPATHMessage(
XPATHErrorResources.ER_FEATURE_UNKNOWN,
new Object[] { name, CLASS_NAME, new Boolean(value) } );
throw new XPathFactoryConfigurationException( fmsg );
}
/**
* Get the state of the named feature.
*
*
* Feature names are fully qualified {@link java.net.URI}s.
* Implementations may define their own features.
* An {@link XPathFactoryConfigurationException} is thrown if this
* XPathFactory or the XPaths
* it creates cannot support the feature.
* It is possible for an XPathFactory to expose a feature
* value but be unable to change its state.
*
*
* @param name Feature name.
*
* @return State of the named feature.
*
* @throws XPathFactoryConfigurationException if this
* XPathFactory or the XPaths
* it creates cannot support this feature.
* @throws NullPointerException if name is
* null.
*/
public boolean getFeature(String name)
throws XPathFactoryConfigurationException {
// feature name cannot be null
if (name == null) {
String fmsg = XSLMessages.createXPATHMessage(
XPATHErrorResources.ER_GETTING_NULL_FEATURE,
new Object[] { CLASS_NAME } );
throw new NullPointerException( fmsg );
}
// secure processing?
if (name.equals(XMLConstants.FEATURE_SECURE_PROCESSING)) {
return !_isNotSecureProcessing;
}
// unknown feature
String fmsg = XSLMessages.createXPATHMessage(
XPATHErrorResources.ER_GETTING_UNKNOWN_FEATURE,
new Object[] { name, CLASS_NAME } );
throw new XPathFactoryConfigurationException( fmsg );
}
/**
* Establish a default function resolver.
*
* Any XPath objects constructed from this factory will use
* the specified resolver by default.
*
* A NullPointerException is thrown if
* resolver is null.
*
* @param resolver XPath function resolver.
*
* @throws NullPointerException If resolver is
* null.
*/
public void setXPathFunctionResolver(XPathFunctionResolver resolver) {
// resolver cannot be null
if (resolver == null) {
String fmsg = XSLMessages.createXPATHMessage(
XPATHErrorResources.ER_NULL_XPATH_FUNCTION_RESOLVER,
new Object[] { CLASS_NAME } );
throw new NullPointerException( fmsg );
}
xPathFunctionResolver = resolver;
}
/**
* Establish a default variable resolver.
*
* Any XPath objects constructed from this factory will use
* the specified resolver by default.
*
* A NullPointerException is thrown if resolver is null.
*
* @param resolver Variable resolver.
*
* @throws NullPointerException If resolver is
* null.
*/
public void setXPathVariableResolver(XPathVariableResolver resolver) {
// resolver cannot be null
if (resolver == null) {
String fmsg = XSLMessages.createXPATHMessage(
XPATHErrorResources.ER_NULL_XPATH_VARIABLE_RESOLVER,
new Object[] { CLASS_NAME } );
throw new NullPointerException( fmsg );
}
xPathVariableResolver = resolver;
}
}