/*
* Copyright 2003-2004 The Apache Software Foundation
*
* Licensed 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.collections.buffer;
import org.apache.commons.collections.Buffer;
import org.apache.commons.collections.Transformer;
import org.apache.commons.collections.collection.TransformedCollection;
/**
* Decorates another <code>Buffer</code> to transform objects that are added.
* <p>
* The add methods are affected by this class.
* Thus objects must be removed or searched for using their transformed form.
* For example, if the transformation converts Strings to Integers, you must
* use the Integer form to remove objects.
* <p>
* This class is Serializable from Commons Collections 3.1.
*
* @since Commons Collections 3.0
* @version $Revision: 155406 $ $Date: 2005-02-26 12:55:26 +0000 (Sat, 26 Feb 2005) $
*
* @author Stephen Colebourne
*/
public class TransformedBuffer extends TransformedCollection implements Buffer {
/** Serialization version */
private static final long serialVersionUID = -7901091318986132033L;
/**
* Factory method to create a transforming buffer.
* <p>
* If there are any elements already in the buffer being decorated, they
* are NOT transformed.
*
* @param buffer the buffer to decorate, must not be null
* @param transformer the transformer to use for conversion, must not be null
* @return a new transformed Buffer
* @throws IllegalArgumentException if buffer or transformer is null
*/
public static Buffer decorate(Buffer buffer, Transformer transformer) {
return new TransformedBuffer(buffer, transformer);
}
//-----------------------------------------------------------------------
/**
* Constructor that wraps (not copies).
* <p>
* If there are any elements already in the buffer being decorated, they
* are NOT transformed.
*
* @param buffer the buffer to decorate, must not be null
* @param transformer the transformer to use for conversion, must not be null
* @throws IllegalArgumentException if buffer or transformer is null
*/
protected TransformedBuffer(Buffer buffer, Transformer transformer) {
super(buffer, transformer);
}
/**
* Gets the decorated buffer.
*
* @return the decorated buffer
*/
protected Buffer getBuffer() {
return (Buffer) collection;
}
//-----------------------------------------------------------------------
public Object get() {
return getBuffer().get();
}
public Object remove() {
return getBuffer().remove();
}
}