nodetest.java

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/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 1999 The Apache Software Foundation.  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 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.
 *
 * 4. The names "Xalan" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written 
 *    permission, please contact [e-mail].
 *
 * 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
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * 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 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.xpath.patterns;

import java.util.Vector;

import javax.xml.transform.TransformerException;
import org.apache.xml.dtm.DTM;
import org.apache.xml.dtm.DTMFilter;
import org.apache.xml.dtm.ref.ExpandedNameTable;
import org.apache.xpath.Expression;
import org.apache.xpath.ExpressionOwner;
import org.apache.xpath.XPath;
import org.apache.xpath.XPathContext;
import org.apache.xpath.XPathVisitor;
import org.apache.xpath.objects.XNumber;
import org.apache.xpath.objects.XObject;

/**
 * <meta name="usage" content="advanced"/>
 * This is the basic node test class for both match patterns and location path
 * steps.
 */
public class NodeTest extends Expression
{

  /**
   * The namespace or local name for node tests with a wildcard.
   *  @see <a href="http://www.w3.org/TR/xpath#NT-NameTest">the XPath NameTest production.</a> 
   */
  public static final String WILD = "*";

  /**
   * The URL to pass to the Node#supports method, to see if the
   * DOM has already been stripped of whitespace nodes. 
   */
  public static final String SUPPORTS_PRE_STRIPPING =
    "http://xml.apache.org/xpath/features/whitespace-pre-stripping";

  /**
   * This attribute determines which node types are accepted.
   * @serial
   */
  protected int m_whatToShow;

  /**
   * Special bitmap for match patterns starting with a function.
   * Make sure this does not conflict with {@link org.w3c.dom.traversal.NodeFilter}.
   */
  public static final int SHOW_BYFUNCTION = 0x00010000;

  /**
   * This attribute determines which node types are accepted.
   * These constants are defined in the {@link org.w3c.dom.traversal.NodeFilter}
   * interface.
   *
   * @return bitset mainly defined in {@link org.w3c.dom.traversal.NodeFilter}.
   */
  public int getWhatToShow()
  {
    return m_whatToShow;
  }
  
  /**
   * This attribute determines which node types are accepted.
   * These constants are defined in the {@link org.w3c.dom.traversal.NodeFilter}
   * interface.
   *
   * @param what bitset mainly defined in {@link org.w3c.dom.traversal.NodeFilter}.
   */
  public void setWhatToShow(int what)
  {
    m_whatToShow = what;
  }

  /**
   * The namespace to be tested for, which may be null.
   *  @serial 
   */
  String m_namespace;

  /**
   * Return the namespace to be tested.
   *
   * @return The namespace to be tested for, or {@link #WILD}, or null.
   */
  public String getNamespace()
  {
    return m_namespace;
  }

  /**
   * Set the namespace to be tested.
   *
   * @param ns The namespace to be tested for, or {@link #WILD}, or null.
   */
  public void setNamespace(String ns)
  {
    m_namespace = ns;
  }

  /**
   * The local name to be tested for.
   *  @serial 
   */
  protected String m_name;

  /**
   * Return the local name to be tested.
   *
   * @return the local name to be tested, or {@link #WILD}, or an empty string.
   */
  public String getLocalName()
  {
    return (null == m_name) ? "" : m_name;
  }

  /**
   * Set the local name to be tested.
   *
   * @param name the local name to be tested, or {@link #WILD}, or an empty string.
   */
  public void setLocalName(String name)
  {
    m_name = name;
  }

  /**
   * Statically calculated score for this test.  One of
   *  {@link #SCORE_NODETEST},
   *  {@link #SCORE_NONE},
   *  {@link #SCORE_NSWILD},
   *  {@link #SCORE_QNAME}, or
   *  {@link #SCORE_OTHER}.
   *  @serial
   */
  XNumber m_score;

  /**
   * The match score if the pattern consists of just a NodeTest.
   *  @see <a href="http://www.w3.org/TR/xslt#conflict">XSLT Specification - 5.5 Conflict Resolution for Template Rules</a> 
   */
  public static final XNumber SCORE_NODETEST =
    new XNumber(XPath.MATCH_SCORE_NODETEST);

  /**
   * The match score if the pattern pattern has the form NCName:*.
   *  @see <a href="http://www.w3.org/TR/xslt#conflict">XSLT Specification - 5.5 Conflict Resolution for Template Rules</a> 
   */
  public static final XNumber SCORE_NSWILD =
    new XNumber(XPath.MATCH_SCORE_NSWILD);

  /**
   * The match score if the pattern has the form
   * of a QName optionally preceded by an @ character.
   *  @see <a href="http://www.w3.org/TR/xslt#conflict">XSLT Specification - 5.5 Conflict Resolution for Template Rules</a> 
   */
  public static final XNumber SCORE_QNAME =
    new XNumber(XPath.MATCH_SCORE_QNAME);

  /**
   * The match score if the pattern consists of something
   * other than just a NodeTest or just a qname.
   *  @see <a href="http://www.w3.org/TR/xslt#conflict">XSLT Specification - 5.5 Conflict Resolution for Template Rules</a> 
   */
  public static final XNumber SCORE_OTHER =
    new XNumber(XPath.MATCH_SCORE_OTHER);

  /**
   * The match score if no match is made.
   *  @see <a href="http://www.w3.org/TR/xslt#conflict">XSLT Specification - 5.5 Conflict Resolution for Template Rules</a> 
   */
  public static final XNumber SCORE_NONE =
    new XNumber(XPath.MATCH_SCORE_NONE);

  /**
   * Construct an NodeTest that tests for namespaces and node names.
   *
   *
   * @param whatToShow Bit set defined mainly by {@link org.w3c.dom.traversal.NodeFilter}.
   * @param namespace The namespace to be tested.
   * @param name The local name to be tested.
   */
  public NodeTest(int whatToShow, String namespace, String name)
  {
    initNodeTest(whatToShow, namespace, name);
  }

  /**
   * Construct an NodeTest that doesn't test for node names.
   *
   *
   * @param whatToShow Bit set defined mainly by {@link org.w3c.dom.traversal.NodeFilter}.
   */
  public NodeTest(int whatToShow)
  {
    initNodeTest(whatToShow);
  }
  
  /**
   * @see Expression#deepEquals(Expression)
   */
  public boolean deepEquals(Expression expr)
  {
  	if(!isSameClass(expr))
  		return false;
  		
  	NodeTest nt = (NodeTest)expr;

  	if(null != nt.m_name)
  	{
  		if(null == m_name)
  			return false;
  		else if(!nt.m_name.equals(m_name))
  			return false;
  	}
  	else if(null != m_name)
  		return false;

  	if(null != nt.m_namespace)
  	{
  		if(null == m_namespace)
  			return false;
  		else if(!nt.m_namespace.equals(m_namespace))
  			return false;
  	}
  	else if(null != m_namespace)
  		return false;
  		  		
  	if(m_whatToShow != nt.m_whatToShow)
  		return false;
  		
  	if(m_isTotallyWild != nt.m_isTotallyWild)
  		return false;

	return true;
  }

  /**
   * Null argument constructor.
   */
  public NodeTest(){}

  /**
   * Initialize this node test by setting the whatToShow property, and
   * calculating the score that this test will return if a test succeeds.
   *
   *
   * @param whatToShow Bit set defined mainly by {@link org.w3c.dom.traversal.NodeFilter}.
   */
  public void initNodeTest(int whatToShow)
  {

    m_whatToShow = whatToShow;

    calcScore();
  }

  /**
   * Initialize this node test by setting the whatToShow property and the
   * namespace and local name, and
   * calculating the score that this test will return if a test succeeds.
   *
   *
   * @param whatToShow Bit set defined mainly by {@link org.w3c.dom.traversal.NodeFilter}.
   * @param namespace The namespace to be tested.
   * @param name The local name to be tested.
   */
  public void initNodeTest(int whatToShow, String namespace, String name)
  {

    m_whatToShow = whatToShow;
    m_namespace = namespace;
    m_name = name;

    calcScore();
  }

  /**
   * True if this test has a null namespace and a local name of {@link #WILD}.
   *  @serial 
   */
  private boolean m_isTotallyWild;
  
  /**
   * Get the static score for this node test.
   * @return Should be one of the SCORE_XXX constants.
   */
  public XNumber getStaticScore()
  {
    return m_score;
  }
  
  /**
   * Set the static score for this node test.
   * @param score Should be one of the SCORE_XXX constants.
   */
  public void setStaticScore(XNumber score)
  {
    m_score = score;
  }

  /**
   * Static calc of match score.
   */
  protected void calcScore()
  {

    if ((m_namespace == null) && (m_name == null))
      m_score = SCORE_NODETEST;
    else if (((m_namespace == WILD) || (m_namespace == null))
             && (m_name == WILD))