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/*
* Copyright (C) 2003-2014 Paolo Boldi and Sebastiano Vigna
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package PACKAGE;
#if #keys(reference)
import java.util.Comparator;
#endif
/** A class providing static methods and objects that do useful things with comparators.
*/
public class COMPARATORS {
private COMPARATORS() {}
/** A type-specific comparator mimicking the natural order. */
@SuppressWarnings({"unchecked","rawtypes"})
public static final KEY_COMPARATOR NATURAL_COMPARATOR = new KEY_ABSTRACT_COMPARATOR() {
public final int compare( final KEY_TYPE a, final KEY_TYPE b ) {
#if #keys(primitive)
return KEY_CMP( a, b );
#else
return ((Comparable)a).compareTo(b);
#endif
}
};
/** A type-specific comparator mimicking the opposite of the natural order. */
@SuppressWarnings({"unchecked","rawtypes"})
public static final KEY_COMPARATOR OPPOSITE_COMPARATOR = new KEY_ABSTRACT_COMPARATOR() {
public final int compare( final KEY_TYPE a, final KEY_TYPE b ) {
#if #keys(primitive)
return - KEY_CMP( a, b );
#else
return ((Comparable)b).compareTo(a);
#endif
}
};
/** Returns a comparator representing the opposite order of the given comparator.
*
* @param c a comparator.
* @return a comparator representing the opposite order of <code>c</code>.
*/
public static KEY_GENERIC KEY_COMPARATOR KEY_GENERIC oppositeComparator( final KEY_COMPARATOR KEY_GENERIC c ) {
return new KEY_ABSTRACT_COMPARATOR KEY_GENERIC() {
private final KEY_COMPARATOR KEY_GENERIC comparator = c;
public final int compare( final KEY_GENERIC_TYPE a, final KEY_GENERIC_TYPE b ) {
return - comparator.compare( a, b );
}
};
}
}
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