/*
* $Header: /cvsroot/jaxen/jaxen/src/java/main/org/jaxen/dom4j/DocumentNavigator.java,v 1.24 2003/06/29 23:22:56 ssanders Exp $
* $Revision: 1.24 $
* $Date: 2003/06/29 23:22:56 $
*
* ====================================================================
*
* Copyright (C) 2000-2002 bob mcwhirter & James Strachan.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions, and the disclaimer that follows
* these conditions in the documentation and/or other materials
* provided with the distribution.
*
* 3. The name "Jaxen" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact license@jaxen.org.
*
* 4. Products derived from this software may not be called "Jaxen", nor
* may "Jaxen" appear in their name, without prior written permission
* from the Jaxen Project Management (pm@jaxen.org).
*
* In addition, we request (but do not require) that you include in the
* end-user documentation provided with the redistribution and/or in the
* software itself an acknowledgement equivalent to the following:
* "This product includes software developed by the
* Jaxen Project (http://www.jaxen.org/)."
* Alternatively, the acknowledgment may be graphical using the logos
* available at http://www.jaxen.org/
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* ====================================================================
* This software consists of voluntary contributions made by many
* individuals on behalf of the Jaxen Project and was originally
* created by bob mcwhirter <bob@werken.com> and
* James Strachan <jstrachan@apache.org>. For more information on the
* Jaxen Project, please see <http://www.jaxen.org/>.
*
* $Id: DocumentNavigator.java,v 1.24 2003/06/29 23:22:56 ssanders Exp $
*/
package org.jaxen.dom4j;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import org.dom4j.Attribute;
import org.dom4j.Branch;
import org.dom4j.CDATA;
import org.dom4j.Comment;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.Namespace;
import org.dom4j.Node;
import org.dom4j.ProcessingInstruction;
import org.dom4j.Text;
import org.dom4j.io.SAXReader;
import org.jaxen.DefaultNavigator;
import org.jaxen.FunctionCallException;
import org.jaxen.XPath;
import org.jaxen.Navigator;
import org.jaxen.util.SingleObjectIterator;
/** Interface for navigating around the EXML object model.
*
* <p>
* This class is not intended for direct usage, but is
* used by the Jaxen engine during evaluation.
* </p>
*
* @see XPath
*
* @author <a href="mailto:bob@werken.com">bob mcwhirter</a>
*/
public class DocumentNavigator extends DefaultNavigator
{
private transient SAXReader reader;
/** Singleton implementation.
*/
private static class Singleton
{
/** Singleton instance.
*/
private static DocumentNavigator instance = new DocumentNavigator();
}
/** Retrieve the singleton instance of this <code>DocumentNavigator</code>.
*/
public static Navigator getInstance()
{
return Singleton.instance;
}
public boolean isElement(Object obj)
{
return obj instanceof Element;
}
public boolean isComment(Object obj)
{
return obj instanceof Comment;
}
public boolean isText(Object obj)
{
return ( obj instanceof Text
||
obj instanceof CDATA );
}
public boolean isAttribute(Object obj)
{
return obj instanceof Attribute;
}
public boolean isProcessingInstruction(Object obj)
{
return obj instanceof ProcessingInstruction;
}
public boolean isDocument(Object obj)
{
return obj instanceof Document;
}
public boolean isNamespace(Object obj)
{
return obj instanceof Namespace;
}
public String getElementName(Object obj)
{
Element elem = (Element) obj;
return elem.getName();
}
public String getElementNamespaceUri(Object obj)
{
Element elem = (Element) obj;
String uri = elem.getNamespaceURI();
if ( uri != null && uri.length() == 0 )
return null;
else
return uri;
}
public String getElementQName(Object obj)
{
Element elem = (Element) obj;
return elem.getQualifiedName();
}
public String getAttributeName(Object obj)
{
Attribute attr = (Attribute) obj;
return attr.getName();
}
public String getAttributeNamespaceUri(Object obj)
{
Attribute attr = (Attribute) obj;
String uri = attr.getNamespaceURI();
if ( uri != null && uri.length() == 0 )
return null;
else
return uri;
}
public String getAttributeQName(Object obj)
{
Attribute attr = (Attribute) obj;
return attr.getQualifiedName();
}
public Iterator getChildAxisIterator(Object contextNode)
{
if ( contextNode instanceof Branch )
{
Branch node = (Branch) contextNode;
return node.nodeIterator();
}
return null;
}
public Iterator getParentAxisIterator(Object contextNode)
{
if ( contextNode instanceof Document )
{
return new SingleObjectIterator( contextNode );
}
Node node = (Node) contextNode;
Object parent = node.getParent();
if ( parent == null )
{
parent = node.getDocument();
}
return new SingleObjectIterator( parent );
}
public Iterator getAttributeAxisIterator(Object contextNode)
{
if ( ! ( contextNode instanceof Element ) )
{
return null;
}
Element elem = (Element) contextNode;
return elem.attributeIterator();
}
public Iterator getNamespaceAxisIterator(Object contextNode)
{
if ( ! ( contextNode instanceof Element ) )
{
return null;
}
Element element = (Element) contextNode;
List nsList = new ArrayList();
HashSet prefixes = new HashSet();
for ( Element context = element; context != null; context = context.getParent() ) {
List declaredNS = context.declaredNamespaces();
for ( Iterator iter = declaredNS.iterator(); iter.hasNext(); )
{
Namespace namespace = (Namespace) iter.next();
String prefix = namespace.getPrefix();
if ( ! prefixes.contains( prefix ) ) {
prefixes.add( prefix );
nsList.add( namespace.asXPathResult( element ) );
}
}
}
nsList.add( Namespace.XML_NAMESPACE.asXPathResult( element ) );
return nsList.iterator();
}
public Object getDocumentNode(Object contextNode)
{
if ( contextNode instanceof Document )
{
return contextNode;
}
else if ( contextNode instanceof Node )
{
Node node = (Node) contextNode;
return node.getDocument();
}
return null;
}
/** Returns a parsed form of the given xpath string, which will be suitable
* for queries on DOM4J documents.
*/
public XPath parseXPath (String xpath) throws org.jaxen.saxpath.SAXPathException
{
return new Dom4jXPath(xpath);
}
public Object getParentNode(Object contextNode)
{
if ( contextNode instanceof Node )
{
Node node = (Node) contextNode;
Object answer = node.getParent();
if ( answer == null )
{
answer = node.getDocument();
if ( answer == null )
{
answer = node;
}
}
return answer;
}
return null;
}
public String getTextStringValue(Object obj)
{
return getNodeStringValue( (Node) obj );
}
public String getElementStringValue(Object obj)
{
return getNodeStringValue( (Node) obj );
}
public String getAttributeStringValue(Object obj)
{
return getNodeStringValue( (Node) obj );
}
private String getNodeStringValue(Node node)
{
return node.getStringValue();
}
public String getNamespaceStringValue(Object obj)
{
Namespace ns = (Namespace) obj;
return ns.getURI();
}
public String getNamespacePrefix(Object obj)
{
Namespace ns = (Namespace) obj;
return ns.getPrefix();
}
public String getCommentStringValue(Object obj)
{
Comment cmt = (Comment) obj;
return cmt.getText();
}
public String translateNamespacePrefixToUri(String prefix, Object context)
{
Element element = null;
if ( context instanceof Element )
{
element = (Element) context;
}
else if ( context instanceof Node )
{
Node node = (Node) context;
element = node.getParent();
}
if ( element != null )
{
Namespace namespace = element.getNamespaceForPrefix( prefix );
if ( namespace != null )
{
return namespace.getURI();
}
}
return null;
}
public short getNodeType(Object node)
{
if ( node instanceof Node )
{
return ((Node) node).getNodeType();
}
return 0;
}
public Object getDocument(String uri) throws FunctionCallException
{
try
{
return getSAXReader().read( uri );
}
catch (DocumentException e)
{
throw new FunctionCallException("Failed to parse document for URI: " + uri, e);
}
}
public String getProcessingInstructionTarget(Object obj)
{
ProcessingInstruction pi = (ProcessingInstruction) obj;
return pi.getTarget();
}
public String getProcessingInstructionData(Object obj)
{
ProcessingInstruction pi = (ProcessingInstruction) obj;
return pi.getText();
}
// Properties
//-------------------------------------------------------------------------
public SAXReader getSAXReader()
{
if ( reader == null )
{
reader = new SAXReader();
reader.setMergeAdjacentText( true );
}
return reader;
}
public void setSAXReader(SAXReader reader)
{
this.reader = reader;
}
}