/*
    * 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.
   */
  public class JDOMAttributePointer extends NodePointer {
  
      private static final long serialVersionUID = 8896050354479644028L;
  
      /** JDOM Attribute. */
      private final Attribute attribute;
  
      /**
       * Create a JDOMAttributePointer.
       *
       * @param parent NodePointer parent.
       * @param attribute   JDOM Attribute.
       */
      public JDOMAttributePointer(final NodePointer parent, final Attribute attribute) {
          super(parent);
          this.attribute = attribute;
      }
  
      @Override
      public String asPath() {
          final StringBuilder buffer = new StringBuilder();
          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();
      }
  
      @Override
      public int compareChildNodePointers(final NodePointer pointer1, final NodePointer pointer2) {
          // Won't happen - attributes don't have children
          return 0;
      }
  
      @Override
      public boolean equals(final Object object) {
          return object == this || object instanceof JDOMAttributePointer && ((JDOMAttributePointer) object).attribute == attribute;
      }
  
      @Override
      public Object getBaseValue() {
          return attribute;
      }
  
      @Override
      public Object getImmediateNode() {
          return attribute;
      }
  
      @Override
      public int getLength() {
          return 1;
      }
  
      @Override
      public QName getName() {
          return new QName(JDOMNodePointer.getPrefix(attribute), JDOMNodePointer.getLocalName(attribute));
      }
  
      @Override
      public String getNamespaceURI() {
          String uri = attribute.getNamespaceURI();
          if (uri != null && uri.isEmpty()) {
              uri = null;
          }
          return uri;
      }
  
     @Override
     public Object getValue() {
         return attribute.getValue();
     }
 
     @Override
     public int hashCode() {
         return System.identityHashCode(attribute);
     }
 
     @Override
     public boolean isActual() {
         return true;
     }
 
     @Override
     public boolean isCollection() {
         return false;
     }
 
     @Override
     public boolean isLeaf() {
         return true;
     }
 
     @Override
     public void remove() {
         attribute.getParent().removeAttribute(attribute);
     }
 
     @Override
     public void setValue(final Object value) {
         attribute.setValue((String) TypeUtils.convert(value, String.class));
     }
 }