cvs commit: xml-xerces/java/src/org/apache/xerces/validators/schema EquivClassComparator.java

[er...@locus.apache.org]

ericye      00/07/13 20:57:11

  Added:       java/src/org/apache/xerces/validators/schema
                        EquivClassComparator.java
  Log:
  Added full equivClass support in Content Models and validation
  --ericye
  
  Revision  Changes    Path
  1.1                  xml-xerces/java/src/org/apache/xerces/validators/schema/EquivClassComparator.java
  
  Index: EquivClassComparator.java
  ===================================================================
  
  /*
   * The Apache Software License, Version 1.1
   *
   *
   * Copyright (c) 2000 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 "Xerces" 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 apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache",
   *    nor may "Apache" appear in their name, without prior written
   *    permission of the Apache Software Foundation.
   *
   * 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,
   * 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 Apache Software Foundation and was
   * originally based on software copyright (c) 1999, International
   * Business Machines, Inc., http://www.apache.org.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   */
  package org.apache.xerces.validators.schema;
  
  import org.apache.xerces.utils.QName;
  import org.apache.xerces.utils.StringPool;
  import org.apache.xerces.validators.common.GrammarResolver;
  
  import org.xml.sax.SAXException;
  
  import java.lang.ClassCastException;
  /* 
   * @author Eric Ye
   *         
   * @see    
   *
   * @version $Id: EquivClassComparator.java,v 1.1 2000/07/14 03:57:10 ericye Exp $
   */
  
  public class EquivClassComparator {
  
      // constants
      private final int TOP_LEVEL_SCOPE = -1;
  
      // private data members
      private StringPool fStringPool = null;
      private GrammarResolver fGrammarResolver = null;
  
      // constructors
      private EquivClassComparator(){
          // can never be instantiated without passing in a GrammarResolver.
      }
      public  EquivClassComparator(GrammarResolver grammarResolver, StringPool stringPool){
          fGrammarResolver = grammarResolver;
          fStringPool = stringPool;
      }
  
      //public methods
      public boolean isEquivalentTo(QName aElement, QName examplar) throws Exception{
          if (aElement.localpart==examplar.localpart && aElement.uri==examplar.uri ) {
              return true;
          }
  
          if (fGrammarResolver == null || fStringPool == null) {
              throw new SAXException("Try to check equivalency by equivClass, but no GrammarResolver is defined");
          }
  
          int count = 16; // 16 is the limit of times for which we'll check the equivClass transitively.
          int uriIndex = aElement.uri;
          int localpartIndex = aElement.localpart;
          String uri = fStringPool.toString(aElement.uri);
          String localpart = fStringPool.toString(aElement.localpart);
  
          while (count >= 0) {
              if(uri==null) {
                  return false;
              }
              SchemaGrammar sGrammar = null;
              try {
                  sGrammar = (SchemaGrammar) fGrammarResolver.getGrammar(uri);
              }
              catch ( ClassCastException ce) {
                  //since the returen Grammar is not a SchemaGrammar, bail out
                  return false;
              }
              if(sGrammar == null) return false;
  
              int elementIndex = sGrammar.getElementDeclIndex(uriIndex, localpartIndex, TOP_LEVEL_SCOPE);
              //System.out.println("----------equivClassFullName : " + uriIndex+","+localpartIndex+","+elementIndex);
              if (elementIndex == -1) {
                  return false;
              }
  
              String equivClassFullName = sGrammar.getElementDeclEquivClassElementFullName(elementIndex);
              //System.out.println("----------equivClassFullName : " + equivClassFullName);
              if (equivClassFullName==null) {
                  return false;
              }
  
              int commaAt = equivClassFullName.indexOf(","); 
              uri = "";
              localpart = equivClassFullName;
              if (  commaAt >= 0  ) {
                  if (commaAt > 0 ) {
                      uri = equivClassFullName.substring(0,commaAt);
                  }
                  localpart = equivClassFullName.substring(commaAt+1);
              }
              uriIndex = fStringPool.addSymbol(uri);
              localpartIndex = fStringPool.addSymbol(localpart);
  
              if (uriIndex == examplar.uri && localpartIndex == examplar.localpart) {
                  return true;
              }
  
              count--;
          }
  
          return false;
      }
  }