/*
    * 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.
   */
  package org.apache.commons.jxpath.ri.model.jdom;
  
  import org.apache.commons.jxpath.ri.QName;
  import org.apache.commons.jxpath.ri.model.NodePointer;
  import org.apache.commons.jxpath.util.TypeUtils;
  import org.jdom.Attribute;
  
  /**
   * A Pointer that points to a DOM node.
   *
   * @author Dmitri Plotnikov
   * @version $Revision: 652884 $ $Date: 2008-05-02 22:02:00 +0200 (Fr, 02 Mai 2008) $
   */
  public class JDOMAttributePointer extends NodePointer {
      private Attribute attr;
  
      private static final long serialVersionUID = 8896050354479644028L;
  
      /**
       * Create a JDOMAttributePointer.
       * @param parent NodePointer parent
       * @param attr JDOM Attribute
       */
      public JDOMAttributePointer(NodePointer parent, Attribute attr) {
          super(parent);
          this.attr = attr;
      }
  
      public QName getName() {
          return new QName(
              JDOMNodePointer.getPrefix(attr),
              JDOMNodePointer.getLocalName(attr));
      }
  
      public String getNamespaceURI() {
          String uri = attr.getNamespaceURI();
          if (uri != null && uri.equals("")) {
              uri = null;
          }
          return uri;
      }
  
      public Object getValue() {
          return attr.getValue();
      }
  
      public Object getBaseValue() {
          return attr;
      }
  
      public boolean isCollection() {
          return false;
      }
  
      public int getLength() {
          return 1;
      }
  
      public Object getImmediateNode() {
          return attr;
      }
  
      public boolean isActual() {
          return true;
      }
  
      public boolean isLeaf() {
          return true;
      }
  
      public void setValue(Object value) {
          attr.setValue((String) TypeUtils.convert(value, String.class));
      }
  
      public void remove() {
          attr.getParent().removeAttribute(attr);
      }
  
      public String asPath() {
          StringBuffer buffer = new StringBuffer();
          if (parent != null) {
              buffer.append(parent.asPath());
              if (buffer.length() == 0
                 || buffer.charAt(buffer.length() - 1) != '/') {
                 buffer.append('/');
             }
         }
         buffer.append('@');
         buffer.append(getName());
         return buffer.toString();
     }
 
     public int hashCode() {
         return System.identityHashCode(attr);
     }
 
     public boolean equals(Object object) {
         return object == this || object instanceof JDOMAttributePointer
                 && ((JDOMAttributePointer) object).attr == attr;
     }
 
     public int compareChildNodePointers(
             NodePointer pointer1,
             NodePointer pointer2) {
         // Won't happen - attributes don't have children
         return 0;
     }
 }