| 1 | /*
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| 2 | * Copyright 2003-2004 The Apache Software Foundation
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| 3 | *
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| 4 | * Licensed under the Apache License, Version 2.0 (the "License");
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| 5 | * you may not use this file except in compliance with the License.
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| 6 | * You may obtain a copy of the License at
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| 7 | *
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| 8 | * http://www.apache.org/licenses/LICENSE-2.0
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| 9 | *
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| 10 | * Unless required by applicable law or agreed to in writing, software
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| 11 | * distributed under the License is distributed on an "AS IS" BASIS,
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| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 13 | * See the License for the specific language governing permissions and
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| 14 | * limitations under the License.
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| 15 | *
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| 16 | */
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| 17 |
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| 18 | package org.apache.tools.ant.types.selectors.modifiedselector;
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| 19 |
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| 20 |
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| 21 | import java.util.Comparator;
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| 22 |
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| 23 |
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| 24 | /**
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| 25 | * Simple implementation of Comparator for use in CacheSelector.
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| 26 | * compare() returns '0' (should not be selected) if both parameter
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| 27 | * are equal otherwise '1' (should be selected).
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| 28 | *
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| 29 | * @version 2003-09-13
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| 30 | * @since Ant 1.6
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| 31 | */
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| 32 | public class EqualComparator implements Comparator {
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| 33 |
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| 34 | /**
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| 35 | * Implements Comparator.compare().
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| 36 | * @param o1 the first object
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| 37 | * @param o2 the second object
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| 38 | * @return 0, if both are equal, otherwise 1
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| 39 | */
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| 40 | public int compare(Object o1, Object o2) {
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| 41 | if (o1 == null) {
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| 42 | if (o2 == null) {
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| 43 | return 1;
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| 44 | } else {
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| 45 | return 0;
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| 46 | }
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| 47 | } else {
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| 48 | return (o1.equals(o2)) ? 0 : 1;
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| 49 | }
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| 50 | }
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| 51 |
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| 52 | /**
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| 53 | * Override Object.toString().
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| 54 | * @return information about this comparator
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| 55 | */
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| 56 | public String toString() {
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| 57 | return "EqualComparator";
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| 58 | }
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| 59 | }
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