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Types that extend and augment the Java Collections Framework.
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/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2003-2004 The Apache Software Foundation.  All rights
 * reserved.
 *
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 * modification, are permitted provided that the following conditions
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 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
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 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowledgement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgement may appear in the software itself,
 *    if and wherever such third-party acknowledgements normally appear.
 *
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 * SUCH DAMAGE.
 * ====================================================================
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 * This software consists of voluntary contributions made by many
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 */
package org.apache.commons.collections.set;

import java.util.Comparator;
import java.util.SortedSet;

import org.apache.commons.collections.Transformer;

/**
 * Decorates another SortedSet 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 21:43:14 $
 * 
 * @author Stephen Colebourne
 */
public class TransformedSortedSet extends TransformedSet implements SortedSet {

    /**
     * Factory method to create a transforming sorted set.
     * 

     * If there are any elements already in the set being decorated, they
     * are NOT transformed.
     * 
     * @param set  the set to decorate, must not be null
     * @param transformer  the transformer to use for conversion, must not be null
     * @throws IllegalArgumentException if set or transformer is null
     */
    public static SortedSet decorate(SortedSet set, Transformer transformer) {
        return new TransformedSortedSet(set, transformer);
    }
    
    //-----------------------------------------------------------------------
    /**
     * Constructor that wraps (not copies).
     * 
     * If there are any elements already in the set being decorated, they
     * are NOT transformed.
     * 
     * @param set  the set to decorate, must not be null
     * @param transformer  the transformer to use for conversion, must not be null
     * @throws IllegalArgumentException if set or transformer is null
     */
    protected TransformedSortedSet(SortedSet set, Transformer transformer) {
        super(set, transformer);
    }

    /**
     * Gets the decorated set.
     * 
     * @return the decorated set
     */
    protected SortedSet getSortedSet() {
        return (SortedSet) collection;
    }

    //-----------------------------------------------------------------------
    public Object first() {
        return getSortedSet().first();
    }

    public Object last() {
        return getSortedSet().last();
    }

    public Comparator comparator() {
        return getSortedSet().comparator();
    }

    //-----------------------------------------------------------------------
    public SortedSet subSet(Object fromElement, Object toElement) {
        SortedSet set = getSortedSet().subSet(fromElement, toElement);
        return new TransformedSortedSet(set, transformer);
    }

    public SortedSet headSet(Object toElement) {
        SortedSet set = getSortedSet().headSet(toElement);
        return new TransformedSortedSet(set, transformer);
    }

    public SortedSet tailSet(Object fromElement) {
        SortedSet set = getSortedSet().tailSet(fromElement);
        return new TransformedSortedSet(set, transformer);
    }

}