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.xalan.xsltc.compiler;
  
  /**
   * @author Jacek Ambroziak
   * @author Santiago Pericas-Geertsen
   * @author Morten Jorgensen
   */
  final class QName {
      private final String _localname;
      private String _prefix;
      private String _namespace;
      private String _stringRep;
      private int    _hashCode;
  
      public QName(String namespace, String prefix, String localname) {
  	_namespace = namespace;
  	_prefix    = prefix;
  	_localname = localname;
  
  	_stringRep = 
  	    (namespace != null && !namespace.equals(Constants.EMPTYSTRING)) ?
  	    (namespace + ':' + localname) : localname;
  
  	_hashCode  = _stringRep.hashCode() + 19; // cached for speed
      }
  
      public void clearNamespace() {
  	_namespace = Constants.EMPTYSTRING;
      }
  
      public String toString() {
  	return _stringRep;
      }
  
      public String getStringRep() {
  	return _stringRep;
      }
  
      public boolean equals(Object other) {
  	return (this == other)
  	           || (other instanceof QName
  	                   && _stringRep.equals(((QName) other).getStringRep()));
      }
  
      public String getLocalPart() {
  	return _localname;
      }
  
      public String getNamespace() {
  	return _namespace;
      }
  
      public String getPrefix() {
  	return _prefix;
      }
  
      public int hashCode() {
  	return _hashCode;
      }
  
      public String dump() {
  	return "QName: " + _namespace + "(" + _prefix + "):" + _localname;
      }
  }
  