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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 Buffer
to transform objects that are added.
*
* 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.
*
* @since Commons Collections 3.0
* @version $Revision: 1.2 $ $Date: 2004/01/14 21:43:08 $
*
* @author Stephen Colebourne
*/
public class TransformedBuffer extends TransformedCollection implements Buffer {
/**
* Factory method to create a transforming buffer.
*
* 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
*/
public static Buffer decorate(Buffer buffer, Transformer transformer) {
return new TransformedBuffer(buffer, transformer);
}
//-----------------------------------------------------------------------
/**
* Constructor that wraps (not copies).
*
* 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();
}
}