01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: *
17: */
18: package org.apache.tools.ant.types.resources.comparators;
19:
20: import org.apache.tools.ant.types.Resource;
21:
22: /**
23: * Compares Resources by existence. Not existing is "less than" existing.
24: * @since Ant 1.7
25: */
26: public class Exists extends ResourceComparator {
27:
28: /**
29: * Compare two Resources.
30: * @param foo the first Resource.
31: * @param bar the second Resource.
32: * @return a negative integer, zero, or a positive integer as the first
33: * argument is less than, equal to, or greater than the second.
34: */
35: protected int resourceCompare(Resource foo, Resource bar) {
36: boolean f = foo.isExists();
37: if (f == bar.isExists()) {
38: return 0;
39: }
40: return f ? 1 : -1;
41: }
42:
43: }
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