beanattributelist.java

Java的面向对象数据库系统的源代码

/*
 * Copyright 2001 (C) MetaStuff, Ltd. All Rights Reserved.
 *
 * This software is open source.
 * See the bottom of this file for the licence.
 *
 * $Id: BeanAttributeList.java,v 1.3 2003/11/02 18:04:59 per_nyfelt Exp $
 */

package org.dom4j.bean;

import org.dom4j.Attribute;
import org.dom4j.QName;

import java.util.AbstractList;

/** <p><code>BeanAttributeList</code> implements a list of Attributes
  * which are the properties of a JavaBean.</p>
  *
  * @author <a href="mailto:[e-mail]">James Strachan</a>
  * @version $Revision: 1.3 $
  */
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(int, Object) is not supported" );
    }

    public void add(int index, Object object) {
        throw new UnsupportedOperationException( "add(int, Object) is not supported" );
    }

    public Object set(int index, Object object) {
        throw new UnsupportedOperationException( "set(int, Object) is not supported" );
    }

    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 parent, 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 [e-mail].
 *
 * 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://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 (C) MetaStuff, Ltd. All Rights Reserved.
 *
 * $Id: BeanAttributeList.java,v 1.3 2003/11/02 18:04:59 per_nyfelt Exp $
 */