OpenConcerto

Dépôt officiel du code source de l'ERP OpenConcerto
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svn://code.openconcerto.org/openconcerto

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/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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 *
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 * Copyright 2011-2019 OpenConcerto, by ILM Informatique. All rights reserved.
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 *
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 * The contents of this file are subject to the terms of the GNU General Public License Version 3
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 * only ("GPL"). You may not use this file except in compliance with the License. You can obtain a
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 * copy of the License at http://www.gnu.org/licenses/gpl-3.0.html See the License for the specific
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 * language governing permissions and limitations under the License.
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 *
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 * When distributing the software, include this License Header Notice in each file.
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 */
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 package org.openconcerto.utils;
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import org.openconcerto.utils.cc.ITransformer;
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import java.util.Comparator;
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/**
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 * A comparator that transforms before comparing.
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 *
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 * @author Sylvain
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 *
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 * @param <E> the type of the objects before being transformed.
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 */
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public class TransformedComparator<E> implements Comparator<E> {
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    private final Comparator<E> comp;
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    public <T extends Comparable<T>> TransformedComparator(final ITransformer<E, T> transf) {
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        this(transf, Comparator.naturalOrder());
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    }
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    public <T> TransformedComparator(final ITransformer<E, T> transf, final Comparator<T> comp) {
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        super();
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        this.comp = (o1, o2) -> (comp.compare(transf.transformChecked(o1), transf.transformChecked(o2)));
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    }
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    @Override
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    public int compare(E o1, E o2) {
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        return this.comp.compare(o1, o2);
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    }
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}