org.opencms.file.collectors.ComparatorInverter Maven / Gradle / Ivy
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/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* For further information about Alkacon Software GmbH & Co. KG, please see the
* company website: http://www.alkacon.com
*
* For further information about OpenCms, please see the
* project website: http://www.opencms.org
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.opencms.file.collectors;
import org.opencms.file.I_CmsResource;
import java.util.Comparator;
/**
* Wrapper around a comparator that inverts comparison results which may e.g. be
* used to invert sort orders.
*
* This is used to create {@link java.util.SortedSet}
instances that may
* sort in different order (ascending vs. descending).
*
*
*
* Internal comparator result
* Transformed result
*
*
* -1
* +1
*
*
* 0
* 0
*
*
* +1
* -1
*
*
*
*
* @since 7.0.3
*
*/
public final class ComparatorInverter implements Comparator {
/** The comparator to invert. */
private Comparator m_delegate;
/**
* Creates a comparator that will invert the result of the given comparator.
*
*
* @param toInvert the comparator to invert results of
*/
public ComparatorInverter(Comparator toInvert) {
m_delegate = toInvert;
}
/**
* @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
*/
public int compare(I_CmsResource o1, I_CmsResource o2) {
int result = m_delegate.compare(o1, o2);
return -result;
}
}