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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 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 org.openconcerto.utils.cc.Transformer;
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import java.util.Comparator;
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import org.apache.commons.collections.ComparatorUtils;
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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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* @param <T> the type of the objects after being transformed.
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*/
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public class TransformedComparator<E, T> implements Comparator<E> {
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public static final <T> TransformedComparator<T, T> from(final Comparator<T> comp) {
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return new TransformedComparator<T, T>(Transformer.<T> nopTransformer(), comp);
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}
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private final ITransformer<E, T> transf;
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private final Comparator<T> comp;
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@SuppressWarnings("unchecked")
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public TransformedComparator(final ITransformer<E, T> transf) {
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this(transf, ComparatorUtils.NATURAL_COMPARATOR);
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}
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public TransformedComparator(final ITransformer<E, T> transf, final Comparator<T> comp) {
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super();
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this.transf = transf;
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this.comp = comp;
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}
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public int compare(E o1, E o2) {
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return this.comp.compare(this.transf.transformChecked(o1), this.transf.transformChecked(o2));
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}
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}
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