/*
    * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
    *
    * This software is open source.
    * See the bottom of this file for the licence.
    */
   
   package org.dom4j.tree;
   
  import java.io.IOException;
  import java.io.Writer;
  
  import org.dom4j.Attribute;
  import org.dom4j.Element;
  import org.dom4j.Namespace;
  import org.dom4j.Node;
  import org.dom4j.Visitor;
  
  /***
   * <p>
   * <code>AbstractNamespace</code> is an abstract base class for tree
   * implementors to use for implementation inheritence.
   * </p>
   * 
   * @author <a href="mailto:jstrachan@apache.org">James Strachan </a>
   * @version $Revision: 1.21 $
   */
  public abstract class AbstractAttribute extends AbstractNode implements
          Attribute {
      public short getNodeType() {
          return ATTRIBUTE_NODE;
      }
  
      public void setNamespace(Namespace namespace) {
          String msg = "This Attribute is read only and cannot be changed";
          throw new UnsupportedOperationException(msg);
      }
  
      public String getText() {
          return getValue();
      }
  
      public void setText(String text) {
          setValue(text);
      }
  
      public void setValue(String value) {
          String msg = "This Attribute is read only and cannot be changed";
          throw new UnsupportedOperationException(msg);
      }
  
      public Object getData() {
          return getValue();
      }
  
      public void setData(Object data) {
          setValue((data == null) ? null : data.toString());
      }
  
      public String toString() {
          return super.toString() + " [Attribute: name " + getQualifiedName()
                  + " value \"" + getValue() + "\"]";
      }
  
      public String asXML() {
          return getQualifiedName() + "=\"" + getValue() + "\"";
      }
  
      public void write(Writer writer) throws IOException {
          writer.write(getQualifiedName());
          writer.write("=\"");
          writer.write(getValue());
          writer.write("\"");
      }
  
      public void accept(Visitor visitor) {
          visitor.visit(this);
      }
  
      // QName methods
      public Namespace getNamespace() {
          return getQName().getNamespace();
      }
  
      public String getName() {
          return getQName().getName();
      }
  
      public String getNamespacePrefix() {
          return getQName().getNamespacePrefix();
      }
  
      public String getNamespaceURI() {
          return getQName().getNamespaceURI();
      }
  
      public String getQualifiedName() {
          return getQName().getQualifiedName();
      }
 
     public String getPath(Element context) {
         StringBuffer result = new StringBuffer();
 
         Element parent = getParent();
 
         if ((parent != null) && (parent != context)) {
             result.append(parent.getPath(context));
             result.append("/");
         }
 
         result.append("@");
 
         String uri = getNamespaceURI();
         String prefix = getNamespacePrefix();
 
         if ((uri == null) || (uri.length() == 0) || (prefix == null)
                 || (prefix.length() == 0)) {
             result.append(getName());
         } else {
             result.append(getQualifiedName());
         }
 
         return result.toString();
     }
 
     public String getUniquePath(Element context) {
         StringBuffer result = new StringBuffer();
 
         Element parent = getParent();
 
         if ((parent != null) && (parent != context)) {
             result.append(parent.getUniquePath(context));
             result.append("/");
         }
 
         result.append("@");
 
         String uri = getNamespaceURI();
         String prefix = getNamespacePrefix();
 
         if ((uri == null) || (uri.length() == 0) || (prefix == null)
                 || (prefix.length() == 0)) {
             result.append(getName());
         } else {
             result.append(getQualifiedName());
         }
 
         return result.toString();
     }
 
     protected Node createXPathResult(Element parent) {
         return new DefaultAttribute(parent, getQName(), getValue());
     }
 }
 
 /*
  * Redistribution and use of this software and associated documentation
  * ("Software"), with or without modification, are permitted provided that the
  * following conditions are met:
  * 
  * 1. Redistributions of source code must retain copyright statements and
  * notices. Redistributions must also contain a copy of this document.
  * 
  * 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 name "DOM4J" must not be used to endorse or promote products derived
  * from this Software without prior written permission of MetaStuff, Ltd. For
  * written permission, please contact dom4j-info@metastuff.com.
  * 
  * 4. Products derived from this Software may not be called "DOM4J" nor may
  * "DOM4J" appear in their names without prior written permission of MetaStuff,
  * Ltd. DOM4J is a registered trademark of MetaStuff, Ltd.
  * 
  * 5. Due credit should be given to the DOM4J Project - http://www.dom4j.org
  * 
  * THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS ``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 METASTUFF, LTD. 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.
  * 
  * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
  */