dom2dtmdefaultnamespacedeclarationnode.java

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/*
 * Copyright 1999-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * $Id: DOM2DTMdefaultNamespaceDeclarationNode.java,v 1.2.4.1 2005/09/15 08:15:11 suresh_emailid Exp $
 */

package com.sun.org.apache.xml.internal.dtm.ref.dom2dtm;

import com.sun.org.apache.xml.internal.dtm.DTMException;

import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.TypeInfo;
import org.w3c.dom.UserDataHandler;
import org.w3c.dom.DOMException;

/** This is a kluge to let us shove a declaration for xml: into the
 * DOM2DTM model.  Basically, it creates a proxy node in DOM space to
 * carry the additional information. This is _NOT_ a full DOM
 * implementation, and shouldn't be one since it sits alongside the
 * DOM rather than becoming part of the DOM model.
 * 
 * (This used to be an internal class within DOM2DTM. Moved out because
 * I need to perform an instanceof operation on it to support a temporary
 * workaround in DTMManagerDefault.)
 * 
 * %REVIEW% What if the DOM2DTM was built around a DocumentFragment and
 * there isn't a single root element? I think this fails that case...
 * 
 * %REVIEW% An alternative solution would be to create the node _only_
 * in DTM space, but given how DOM2DTM is currently written I think
 * this is simplest.
 * */
public class DOM2DTMdefaultNamespaceDeclarationNode implements Attr,TypeInfo
{
  final String NOT_SUPPORTED_ERR="Unsupported operation on pseudonode";
  
  Element pseudoparent;
  String prefix,uri,nodename;
  int handle;
  DOM2DTMdefaultNamespaceDeclarationNode(Element pseudoparent,String prefix,String uri,int handle)
  {
    this.pseudoparent=pseudoparent;
    this.prefix=prefix;
    this.uri=uri;
    this.handle=handle;
    this.nodename="xmlns:"+prefix;
  }
  public String getNodeName() {return nodename;}
  public String getName() {return nodename;}
  public String getNamespaceURI() {return "http://www.w3.org/2000/xmlns/";}
  public String getPrefix() {return prefix;}
  public String getLocalName() {return prefix;}
  public String getNodeValue() {return uri;}
  public String getValue() {return uri;}
  public Element getOwnerElement() {return pseudoparent;}
  
  public boolean isSupported(String feature, String version) {return false;}
  public boolean hasChildNodes() {return false;}
  public boolean hasAttributes() {return false;}
  public Node getParentNode() {return null;}
  public Node getFirstChild() {return null;}
  public Node getLastChild() {return null;}
  public Node getPreviousSibling() {return null;}
  public Node getNextSibling() {return null;}
  public boolean getSpecified() {return false;}
  public void normalize() {return;}
  public NodeList getChildNodes() {return null;}
  public NamedNodeMap getAttributes() {return null;}
  public short getNodeType() {return Node.ATTRIBUTE_NODE;}
  public void setNodeValue(String value) {throw new DTMException(NOT_SUPPORTED_ERR);}
  public void setValue(String value) {throw new DTMException(NOT_SUPPORTED_ERR);}
  public void setPrefix(String value) {throw new DTMException(NOT_SUPPORTED_ERR);}
  public Node insertBefore(Node a, Node b) {throw new DTMException(NOT_SUPPORTED_ERR);}
  public Node replaceChild(Node a, Node b) {throw new DTMException(NOT_SUPPORTED_ERR);}
  public Node appendChild(Node a) {throw new DTMException(NOT_SUPPORTED_ERR);}
  public Node removeChild(Node a) {throw new DTMException(NOT_SUPPORTED_ERR);}
  public Document getOwnerDocument() {return pseudoparent.getOwnerDocument();}
  public Node cloneNode(boolean deep) {throw new DTMException(NOT_SUPPORTED_ERR);}
	
    /** Non-DOM method, part of the temporary kluge
     * %REVIEW% This would be a pruning problem, but since it will always be
     * added to the root element and we prune on elements, we shouldn't have 
     * to worry.
     */
    public int getHandleOfNode()		
    {
        return handle;
    }

    //RAMESH: PENDING=> Add proper implementation for the below DOM L3 additions

    /**
     * @see org.w3c.dom.TypeInfo#getTypeName()
     */
    public String getTypeName() {return null; }
     
    /**
     * @see org.w3c.dom.TypeInfo#getTypeNamespace()
     */
    public String getTypeNamespace() { return null;}
    
    /**
     * @see or.gw3c.dom.TypeInfo#isDerivedFrom(String,String,int)
     */
    public boolean isDerivedFrom( String ns, String localName, int derivationMethod ) {
        return false;
    }

    public TypeInfo getSchemaTypeInfo() { return this; }
    
    public boolean isId( ) { return false; }

    /**
     * Associate an object to a key on this node. The object can later be
     * retrieved from this node by calling <code>getUserData</code> with the
     * same key.
     * @param key The key to associate the object to.
     * @param data The object to associate to the given key, or
     *   <code>null</code> to remove any existing association to that key.
     * @param handler The handler to associate to that key, or
     *   <code>null</code>.
     * @return Returns the <code>DOMObject</code> previously associated to
     *   the given key on this node, or <code>null</code> if there was none.
     * @since DOM Level 3
     */
    public Object setUserData(String key,
                              Object data,
                              UserDataHandler handler) {
        return getOwnerDocument().setUserData( key, data, handler);
    }

    /**
     * Retrieves the object associated to a key on a this node. The object
     * must first have been set to this node by calling
     * <code>setUserData</code> with the same key.
     * @param key The key the object is associated to.
     * @return Returns the <code>DOMObject</code> associated to the given key
     *   on this node, or <code>null</code> if there was none.
     * @since DOM Level 3
     */
    public Object getUserData(String key) {
        return getOwnerDocument().getUserData( key);
    } 

    /**
     *  This method returns a specialized object which implements the
     * specialized APIs of the specified feature and version. The
     * specialized object may also be obtained by using binding-specific
     * casting methods but is not necessarily expected to, as discussed in Mixed DOM implementations.
     * @param feature The name of the feature requested (case-insensitive).
     * @param version  This is the version number of the feature to test. If
     *   the version is <code>null</code> or the empty string, supporting
     *   any version of the feature will cause the method to return an
     *   object that supports at least one version of the feature.
     * @return  Returns an object which implements the specialized APIs of
     *   the specified feature and version, if any, or <code>null</code> if
     *   there is no object which implements interfaces associated with that
     *   feature. If the <code>DOMObject</code> returned by this method
     *   implements the <code>Node</code> interface, it must delegate to the
     *   primary core <code>Node</code> and not return results inconsistent
     *   with the primary core <code>Node</code> such as attributes,
     *   childNodes, etc.
     * @since DOM Level 3
     */
    public Object getFeature(String feature, String version) {
        // we don't have any alternate node, either this node does the job
        // or we don't have anything that does
        return isSupported(feature, version) ? this : null;
    }

    /**
     * Tests whether two nodes are equal.
     * <br>This method tests for equality of nodes, not sameness (i.e.,
     * whether the two nodes are references to the same object) which can be
     * tested with <code>Node.isSameNode</code>. All nodes that are the same
     * will also be equal, though the reverse may not be true.
     * <br>Two nodes are equal if and only if the following conditions are
     * satisfied: The two nodes are of the same type.The following string
     * attributes are equal: <code>nodeName</code>, <code>localName</code>,
     * <code>namespaceURI</code>, <code>prefix</code>, <code>nodeValue</code>
     * , <code>baseURI</code>. This is: they are both <code>null</code>, or
     * they have the same length and are character for character identical.
     * The <code>attributes</code> <code>NamedNodeMaps</code> are equal.
     * This is: they are both <code>null</code>, or they have the same
     * length and for each node that exists in one map there is a node that
     * exists in the other map and is equal, although not necessarily at the
     * same index.The <code>childNodes</code> <code>NodeLists</code> are
     * equal. This is: they are both <code>null</code>, or they have the
     * same length and contain equal nodes at the same index. This is true
     * for <code>Attr</code> nodes as for any other type of node. Note that
     * normalization can affect equality; to avoid this, nodes should be
     * normalized before being compared.
     * <br>For two <code>DocumentType</code> nodes to be equal, the following
     * conditions must also be satisfied: The following string attributes
     * are equal: <code>publicId</code>, <code>systemId</code>,
     * <code>internalSubset</code>.The <code>entities</code>
     * <code>NamedNodeMaps</code> are equal.The <code>notations</code>
     * <code>NamedNodeMaps</code> are equal.
     * <br>On the other hand, the following do not affect equality: the
     * <code>ownerDocument</code> attribute, the <code>specified</code>
     * attribute for <code>Attr</code> nodes, the
     * <code>isWhitespaceInElementContent</code> attribute for
     * <code>Text</code> nodes, as well as any user data or event listeners
     * registered on the nodes.
     * @param arg The node to compare equality with.
     * @param deep If <code>true</code>, recursively compare the subtrees; if
     *   <code>false</code>, compare only the nodes themselves (and its
     *   attributes, if it is an <code>Element</code>).
     * @return If the nodes, and possibly subtrees are equal,
     *   <code>true</code> otherwise <code>false</code>.
     * @since DOM Level 3
     */
    public boolean isEqualNode(Node arg) {
        if (arg == this) {
            return true;
        }
        if (arg.getNodeType() != getNodeType()) {
            return false;
        }
        // in theory nodeName can't be null but better be careful
        // who knows what other implementations may be doing?...
        if (getNodeName() == null) {
            if (arg.getNodeName() != null) {
                return false;
            }
        }
        else if (!getNodeName().equals(arg.getNodeName())) {
            return false;
        }

        if (getLocalName() == null) {
            if (arg.getLocalName() != null) {
                return false;
            }
        }
        else if (!getLocalName().equals(arg.getLocalName())) {
            return false;
        }

        if (getNamespaceURI() == null) {
            if (arg.getNamespaceURI() != null) {
                return false;
            }
        }
        else if (!getNamespaceURI().equals(arg.getNamespaceURI())) {
            return false;
        }

        if (getPrefix() == null) {
            if (arg.getPrefix() != null) {
                return false;
            }
        }
        else if (!getPrefix().equals(arg.getPrefix())) {
            return false;
        }

        if (getNodeValue() == null) {
            if (arg.getNodeValue() != null) {
                return false;
            }
        }
        else if (!getNodeValue().equals(arg.getNodeValue())) {
            return false;
        }
    /*
        if (getBaseURI() == null) {
            if (((NodeImpl) arg).getBaseURI() != null) {
                return false;
            }
        }
        else if (!getBaseURI().equals(((NodeImpl) arg).getBaseURI())) {
            return false;
        }
*/

             return true;
    }

    /**
     * DOM Level 3 - Experimental:
     * Look up the namespace URI associated to the given prefix, starting from this node.
     * Use lookupNamespaceURI(null) to lookup the default namespace
     *
     * @param namespaceURI
     * @return th URI for the namespace
     * @since DOM Level 3
     */
    public String lookupNamespaceURI(String specifiedPrefix) {
        short type = this.getNodeType();
        switch (type) {
        case Node.ELEMENT_NODE : {

                String namespace = this.getNamespaceURI();
                String prefix = this.getPrefix();
                if (namespace !=null) {
                    // REVISIT: is it possible that prefix is empty string?
                    if (specifiedPrefix== null && prefix==specifiedPrefix) {
                        // looking for default namespace
                        return namespace;
                    } else if (prefix != null && prefix.equals(specifiedPrefix)) {
                        // non default namespace
                        return namespace;
                    }
                }
                if (this.hasAttributes()) {
                    NamedNodeMap map = this.getAttributes();
                    int length = map.getLength();
                    for (int i=0;i<length;i++) {
                        Node attr = map.item(i);
                        String attrPrefix = attr.getPrefix();
                        String value = attr.getNodeValue();
                        namespace = attr.getNamespaceURI();
                        if (namespace !=null && namespace.equals("http://www.w3.org/2000/xmlns/")) {
                            // at this point we are dealing with DOM Level 2 nodes only
                            if (specifiedPrefix == null &&
                                attr.getNodeName().equals("xmlns")) {
                                // default namespace
                                return value;
                            } else if (attrPrefix !=null &&
                                       attrPrefix.equals("xmlns") &&