dtmnodeproxy.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: DTMNodeProxy.java,v 
 */
package com.sun.org.apache.xml.internal.dtm.ref;

import java.util.Vector;

import com.sun.org.apache.xml.internal.dtm.DTM;
import com.sun.org.apache.xml.internal.dtm.DTMDOMException;
import com.sun.org.apache.xpath.internal.NodeSet;

import org.w3c.dom.Attr;
import org.w3c.dom.CDATASection;
import org.w3c.dom.Comment;
import org.w3c.dom.DOMException;
import org.w3c.dom.DOMImplementation;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentFragment;
import org.w3c.dom.DocumentType;
import org.w3c.dom.Element;
import org.w3c.dom.EntityReference;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.ProcessingInstruction;
import org.w3c.dom.Text;

import org.w3c.dom.UserDataHandler;
import org.w3c.dom.DOMConfiguration;
import org.w3c.dom.TypeInfo;

/**
 * <code>DTMNodeProxy</code> presents a DOM Node API front-end to the DTM model.
 * <p>
 * It does _not_ attempt to address the "node identity" question; no effort
 * is made to prevent the creation of multiple proxies referring to a single
 * DTM node. Users can create a mechanism for managing this, or relinquish the
 * use of "==" and use the .sameNodeAs() mechanism, which is under
 * consideration for future versions of the DOM.
 * <p>
 * DTMNodeProxy may be subclassed further to present specific DOM node types.
 *
 * @see org.w3c.dom
 */
public class DTMNodeProxy
  implements Node, Document, Text, Element, Attr,
                   ProcessingInstruction, Comment, DocumentFragment
{

  /** The DTM for this node. */
  public DTM dtm;

  /** The DTM node handle. */
  int node;
  
  /** The return value as Empty String. */
  private static final String EMPTYSTRING = "";
        
  /** The DOMImplementation object */
  static final DOMImplementation implementation=new DTMNodeProxyImplementation();

  /**
   * Create a DTMNodeProxy Node representing a specific Node in a DTM
   *
   * @param dtm The DTM Reference, must be non-null.
   * @param node The DTM node handle.
   */
  public DTMNodeProxy(DTM dtm, int node)
  {
    this.dtm = dtm;
    this.node = node;
  }

  /**
   * NON-DOM: Return the DTM model
   *
   * @return The DTM that this proxy is a representative for.
   */
  public final DTM getDTM()
  {
    return dtm;
  }

  /**
   * NON-DOM: Return the DTM node number
   *
   * @return The DTM node handle.
   */
  public final int getDTMNodeNumber()
  {
    return node;
  }

  /**
   * Test for equality based on node number.
   *
   * @param node A DTM node proxy reference.
   *
   * @return true if the given node has the same handle as this node.
   */
  public final boolean equals(Node node)
  {

    try
    {
      DTMNodeProxy dtmp = (DTMNodeProxy) node;

      // return (dtmp.node == this.node);
      // Patch attributed to Gary L Peskin <[e-mail]>
      return (dtmp.node == this.node) && (dtmp.dtm == this.dtm);
    }
    catch (ClassCastException cce)
    {
      return false;
    }
  }

  /**
   * Test for equality based on node number.
   *
   * @param node A DTM node proxy reference.
   *
   * @return true if the given node has the same handle as this node.
   */
  public final boolean equals(Object node)
  {

    try
    {

      // DTMNodeProxy dtmp = (DTMNodeProxy)node;
      // return (dtmp.node == this.node);
      // Patch attributed to Gary L Peskin <[e-mail]>
      return equals((Node) node);
    }
    catch (ClassCastException cce)
    {
      return false;
    }
  }

  /**
   * FUTURE DOM: Test node identity, in lieu of Node==Node
   *
   * @param other
   *
   * @return true if the given node has the same handle as this node.
   */
  public final boolean sameNodeAs(Node other)
  {

    if (!(other instanceof DTMNodeProxy))
      return false;

    DTMNodeProxy that = (DTMNodeProxy) other;

    return this.dtm == that.dtm && this.node == that.node;
  }

  /**
   *
   * 
   * @see org.w3c.dom.Node
   */
  public final String getNodeName()
  {
    return dtm.getNodeName(node);
  }

  /**
   * A PI's "target" states what processor channel the PI's data
   * should be directed to. It is defined differently in HTML and XML.
   * <p>
   * In XML, a PI's "target" is the first (whitespace-delimited) token
   * following the "<?" token that begins the PI.
   * <p>
   * In HTML, target is always null.
   * <p>
   * Note that getNodeName is aliased to getTarget.
   *
   * 
   */
  public final String getTarget()
  {
    return dtm.getNodeName(node);
  }  // getTarget():String

  /**
   *
   * 
   * @see org.w3c.dom.Node as of DOM Level 2
   */
  public final String getLocalName()
  {
    return dtm.getLocalName(node);
  }

  /**
   * @return The prefix for this node.
   * @see org.w3c.dom.Node as of DOM Level 2
   */
  public final String getPrefix()
  {
    return dtm.getPrefix(node);
  }

  /**
   *
   * @param prefix
   *
   * @throws DOMException
   * @see org.w3c.dom.Node as of DOM Level 2 -- DTMNodeProxy is read-only
   */
  public final void setPrefix(String prefix) throws DOMException
  {
    throw new DTMDOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR);
  }

  /**
   *
   * 
   * @see org.w3c.dom.Node as of DOM Level 2
   */
  public final String getNamespaceURI()
  {
    return dtm.getNamespaceURI(node);
  }

  /** Ask whether we support a given DOM feature.
   * In fact, we do not _fully_ support any DOM feature -- we're a
   * read-only subset -- so arguably we should always return false.
   * Or we could say that we support DOM Core Level 2 but all nodes
   * are read-only. Unclear which answer is least misleading.
   * 
   * NON-DOM method. This was present in early drafts of DOM Level 2,
   * but was renamed isSupported. It's present here only because it's
   * cheap, harmless, and might help some poor fool who is still trying
   * to use an early Working Draft of the DOM.
   *
   * @param feature
   * @param version
   *
   * @return false
   */
  public final boolean supports(String feature, String version)
  {
    return implementation.hasFeature(feature,version);
    //throw new DTMDOMException(DOMException.NOT_SUPPORTED_ERR);
  }

  /** Ask whether we support a given DOM feature.
   * In fact, we do not _fully_ support any DOM feature -- we're a
   * read-only subset -- so arguably we should always return false.
   *
   * @param feature
   * @param version
   *
   * @return false
   * @see org.w3c.dom.Node as of DOM Level 2
   */
  public final boolean isSupported(String feature, String version)
  {
    return implementation.hasFeature(feature,version);
    // throw new DTMDOMException(DOMException.NOT_SUPPORTED_ERR);
  }

  /**
   *
   * 
   *
   * @throws DOMException
   * @see org.w3c.dom.Node
   */
  public final String getNodeValue() throws DOMException
  {
    return dtm.getNodeValue(node);
  }
  
  /**
   * @return The string value of the node
   * 
   * @throws DOMException
   */
  public final String getStringValue() throws DOMException
  {
  	return dtm.getStringValue(node).toString();
  }

  /**
   *
   * @param nodeValue
   *
   * @throws DOMException
   * @see org.w3c.dom.Node -- DTMNodeProxy is read-only
   */
  public final void setNodeValue(String nodeValue) throws DOMException
  {
    throw new DTMDOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR);
  }

  /**
   *
   * 
   * @see org.w3c.dom.Node
   */
  public final short getNodeType()
  {
    return (short) dtm.getNodeType(node);
  }

  /**
   *
   * 
   * @see org.w3c.dom.Node
   */
  public final Node getParentNode()
  {

    if (getNodeType() == Node.ATTRIBUTE_NODE)
      return null;

    int newnode = dtm.getParent(node);

    return (newnode == DTM.NULL) ? null : dtm.getNode(newnode);
  }

  /**
   *
   * 
   * @see org.w3c.dom.Node
   */
  public final Node getOwnerNode()
  {

    int newnode = dtm.getParent(node);

    return (newnode == DTM.NULL) ? null : dtm.getNode(newnode);
  }

  /**
   *
   * 
   * @see org.w3c.dom.Node
   */
  public final NodeList getChildNodes()
  {
                
    // Annoyingly, AxisIterators do not currently implement DTMIterator, so
    // we can't just wap DTMNodeList around an Axis.CHILD iterator.
    // Instead, we've created a special-case operating mode for that object.
    return new DTMChildIterNodeList(dtm,node);

    // throw new DTMDOMException(DOMException.NOT_SUPPORTED_ERR);
  }

  /**
   *
   * 
   * @see org.w3c.dom.Node
   */
  public final Node getFirstChild()
  {

    int newnode = dtm.getFirstChild(node);

    return (newnode == DTM.NULL) ? null : dtm.getNode(newnode);
  }

  /**
   *
   * 
   * @see org.w3c.dom.Node
   */
  public final Node getLastChild()
  {

    int newnode = dtm.getLastChild(node);

    return (newnode == DTM.NULL) ? null : dtm.getNode(newnode);
  }

  /**
   *
   * 
   * @see org.w3c.dom.Node
   */
  public final Node getPreviousSibling()
  {

    int newnode = dtm.getPreviousSibling(node);

    return (newnode == DTM.NULL) ? null : dtm.getNode(newnode);
  }

  /**
   *
   * 
   * @see org.w3c.dom.Node
   */
  public final Node getNextSibling()
  {

    // Attr's Next is defined at DTM level, but not at DOM level.
    if (dtm.getNodeType(node) == Node.ATTRIBUTE_NODE)
      return null;

    int newnode = dtm.getNextSibling(node);

    return (newnode == DTM.NULL) ? null : dtm.getNode(newnode);
  }

  // DTMNamedNodeMap m_attrs;

  /**
   *
   * 
   * @see org.w3c.dom.Node
   */
  public final NamedNodeMap getAttributes()
  {

    return new DTMNamedNodeMap(dtm, node);
  }

  /**
   * Method hasAttribute
   *
   *
   * @param name
   *
   */
  public boolean hasAttribute(String name)
  {
    return DTM.NULL != dtm.getAttributeNode(node,null,name);
  }

  /**
   * Method hasAttributeNS
   *
   *
   * @param namespaceURI
   * @param localName
   *
   *
   */
  public boolean hasAttributeNS(String namespaceURI, String localName)
  {
    return DTM.NULL != dtm.getAttributeNode(node,namespaceURI,localName);