code: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements. See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership. The ASF licenses this file
   * to you 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.
   */
  /*
   * $Id$
   */
  package org.apache.xml.utils;
  
  import java.io.Serializable;
  
  import org.xml.sax.Attributes;
  import org.xml.sax.helpers.AttributesImpl;
  
  /**
   * Mutable version of AttributesImpl.
   * @xsl.usage advanced
   */
  public class MutableAttrListImpl extends AttributesImpl
          implements Serializable
  {
      static final long serialVersionUID = 6289452013442934470L;
  
  /**
   * Construct a new, empty AttributesImpl object.
   */
  
  public MutableAttrListImpl()
    {
      super();
    }
  
    /**
     * Copy an existing Attributes object.
     *
     * <p>This constructor is especially useful inside a start
     * element event.</p>
     *
     * @param atts The existing Attributes object.
     */
    public MutableAttrListImpl(Attributes atts)
    {
      super(atts);
    }
  
    /**
     * Add an attribute to the end of the list.
     *
     * <p>For the sake of speed, this method does no checking
     * to see if the attribute is already in the list: that is
     * the responsibility of the application.</p>
     *
     * @param uri The Namespace URI, or the empty string if
     *        none is available or Namespace processing is not
     *        being performed.
     * @param localName The local name, or the empty string if
     *        Namespace processing is not being performed.
     * @param qName The qualified (prefixed) name, or the empty string
     *        if qualified names are not available.
     * @param type The attribute type as a string.
     * @param value The attribute value.
     */
    public void addAttribute(String uri, String localName, String qName,
                             String type, String value)
    {
  
      if (null == uri)
        uri = "";
  
      // getIndex(qName) seems to be more reliable than getIndex(uri, localName), 
      // in the case of the xmlns attribute anyway.
      int index = this.getIndex(qName);
      // int index = this.getIndex(uri, localName);
     
      // System.out.println("MutableAttrListImpl#addAttribute: "+uri+":"+localName+", "+index+", "+qName+", "+this);
  
      if (index >= 0)
        this.setAttribute(index, uri, localName, qName, type, value);
      else
        super.addAttribute(uri, localName, qName, type, value);
    }
  
    /**
     * Add the contents of the attribute list to this list.
     *
     * @param atts List of attributes to add to this list
     */
    public void addAttributes(Attributes atts)
    {
  
      int nAtts = atts.getLength();
  
      for (int i = 0; i < nAtts; i++)
      {
        String uri = atts.getURI(i);
  
        if (null == uri)
          uri = "";
  
        String localName = atts.getLocalName(i);
        String qname = atts.getQName(i);
        int index = this.getIndex(uri, localName);
        // System.out.println("MutableAttrListImpl#addAttributes: "+uri+":"+localName+", "+index+", "+atts.getQName(i)+", "+this);
        if (index >= 0)
          this.setAttribute(index, uri, localName, qname, atts.getType(i),
                            atts.getValue(i));
        else
          addAttribute(uri, localName, qname, atts.getType(i),
                       atts.getValue(i));
      }
    }
  
    /**
     * Return true if list contains the given (raw) attribute name.
     *
     * @param name Raw name of attribute to look for 
     *
     * @return true if an attribute is found with this name
     */
    public boolean contains(String name)
    {
      return getValue(name) != null;
    }
  }
  
  // end of MutableAttrListImpl.java
  