Dépôt officiel du code source de l'ERP OpenConcerto

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 2011-2019 OpenConcerto, by ILM Informatique. All rights reserved.
 * 
 * The contents of this file are subject to the terms of the GNU General Public License Version 3
 * only ("GPL"). You may not use this file except in compliance with the License. You can obtain a
 * copy of the License at http://www.gnu.org/licenses/gpl-3.0.html See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each file.
 */
 
 package org.openconcerto.utils;

import org.openconcerto.utils.cc.ITransformer;

import java.util.Comparator;

/**
 * A comparator that transforms before comparing.
 * 
 * @author Sylvain
 * 
 * @param <E> the type of the objects before being transformed.
 */
public class TransformedComparator<E> implements Comparator<E> {

    private final Comparator<E> comp;

    public <T extends Comparable<T>> TransformedComparator(final ITransformer<E, T> transf) {
        this(transf, Comparator.naturalOrder());
    }

    public <T> TransformedComparator(final ITransformer<E, T> transf, final Comparator<T> comp) {
        super();
        this.comp = (o1, o2) -> (comp.compare(transf.transformChecked(o1), transf.transformChecked(o2)));
    }

    @Override
    public int compare(E o1, E o2) {
        return this.comp.compare(o1, o2);
    }
}