/*
    * 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.bean;
   
  import java.util.AbstractList;
  
  import org.dom4j.Attribute;
  import org.dom4j.QName;
  
  /***
   * <p>
   * <code>BeanAttributeList</code> implements a list of Attributes which are
   * the properties of a JavaBean.
   * </p>
   * 
   * @author <a href="mailto:james.strachan@metastuff.com">James Strachan </a>
   * @version $Revision: 1.9 $
   */
  public class BeanAttributeList extends AbstractList {
      /*** The BeanElement that this */
      private BeanElement parent;
  
      /*** The BeanElement that this */
      private BeanMetaData beanMetaData;
  
      /*** The attributes */
      private BeanAttribute[] attributes;
  
      public BeanAttributeList(BeanElement parent, BeanMetaData beanMetaData) {
          this.parent = parent;
          this.beanMetaData = beanMetaData;
          this.attributes = new BeanAttribute[beanMetaData.attributeCount()];
      }
  
      public BeanAttributeList(BeanElement parent) {
          this.parent = parent;
  
          Object data = parent.getData();
          Class beanClass = (data != null) ? data.getClass() : null;
          this.beanMetaData = BeanMetaData.get(beanClass);
          this.attributes = new BeanAttribute[beanMetaData.attributeCount()];
      }
  
      public Attribute attribute(String name) {
          int index = beanMetaData.getIndex(name);
  
          return attribute(index);
      }
  
      public Attribute attribute(QName qname) {
          int index = beanMetaData.getIndex(qname);
  
          return attribute(index);
      }
  
      public BeanAttribute attribute(int index) {
          if ((index >= 0) && (index <= attributes.length)) {
              BeanAttribute attribute = attributes[index];
  
              if (attribute == null) {
                  attribute = createAttribute(parent, index);
                  attributes[index] = attribute;
              }
  
              return attribute;
          }
  
          return null;
      }
  
      public BeanElement getParent() {
          return parent;
      }
  
      public QName getQName(int index) {
          return beanMetaData.getQName(index);
      }
  
      public Object getData(int index) {
          return beanMetaData.getData(index, parent.getData());
      }
  
      public void setData(int index, Object data) {
          beanMetaData.setData(index, parent.getData(), data);
      }
  
      // List interface
      // -------------------------------------------------------------------------
      public int size() {
          return attributes.length;
      }
  
      public Object get(int index) {
          BeanAttribute attribute = attributes[index];
 
         if (attribute == null) {
             attribute = createAttribute(parent, index);
             attributes[index] = attribute;
         }
 
         return attribute;
     }
 
     public boolean add(Object object) {
         throw new UnsupportedOperationException("add(Object) unsupported");
     }
 
     public void add(int index, Object object) {
         throw new UnsupportedOperationException("add(int,Object) unsupported");
     }
 
     public Object set(int index, Object object) {
         throw new UnsupportedOperationException("set(int,Object) unsupported");
     }
 
     public boolean remove(Object object) {
         return false;
     }
 
     public Object remove(int index) {
         BeanAttribute attribute = (BeanAttribute) get(index);
         Object oldValue = attribute.getValue();
         attribute.setValue(null);
 
         return oldValue;
     }
 
     public void clear() {
         for (int i = 0, size = attributes.length; i < size; i++) {
             BeanAttribute attribute = attributes[i];
 
             if (attribute != null) {
                 attribute.setValue(null);
             }
         }
     }
 
     // Implementation methods
     // -------------------------------------------------------------------------
     protected BeanAttribute createAttribute(BeanElement element, int index) {
         return new BeanAttribute(this, index);
     }
 }
 
 /*
  * 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.
  */