dtmnodeproxy.java

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/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
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 * 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. 
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 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
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 * 4. The names "Xalan" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
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 * 5. Products derived from this software may not be called "Apache",
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 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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 * 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 Apache Software Foundation and was
 * originally based on software copyright (c) 1999, Lotus
 * Development Corporation., http://www.lotus.com.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
package org.apache.xml.dtm.ref;

import org.w3c.dom.*;
import org.apache.xml.dtm.*;
import org.apache.xml.dtm.Axis;

/**
 * <meta name="usage" content="internal"/>
 * <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 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.
   */
  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;
  }

  /**
   *
   * @return
   * @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.
   *
   * @return
   */
  public final String getTarget()
  {
    return dtm.getNodeName(node);
  }  // getTarget():String

  /**
   *
   * @return
   * @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);
  }

  /**
   *
   * @return
   * @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);
  }

  /**
   *
   * @return
   *
   * @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);
  }

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

  /**
   *
   * @return
   * @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);
  }

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

    int newnode = dtm.getParent(node);

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

  /**
   *
   * @return
   * @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 DTMNodeList(dtm,node);

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

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

    int newnode = dtm.getFirstChild(node);

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

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

    int newnode = dtm.getLastChild(node);

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

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

    int newnode = dtm.getPreviousSibling(node);

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

  /**
   *
   * @return
   * @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;

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

    return new DTMNamedNodeMap(dtm, node);
  }

  /**
   * Method hasAttribute
   *
   *
   * @param name
   *
   * (hasAttribute) @return
   */