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.ivy.plugins.matcher;
19:
20: /**
21: * Implementation of an exact matcher. <p/> The matching will be performed against an expression
22: * being a string. It will only matches if both strings are equal (per equals()) rule or if both
23: * strings are null.
24: */
25: public/* @Immutable */final class ExactPatternMatcher extends
26: AbstractPatternMatcher {
27:
28: public static final ExactPatternMatcher INSTANCE = new ExactPatternMatcher();
29:
30: public ExactPatternMatcher() {
31: super (EXACT);
32: }
33:
34: protected Matcher newMatcher(String expression) {
35: return new ExactMatcher(expression);
36: }
37:
38: private static/* @Immutable */class ExactMatcher implements
39: Matcher {
40: private String expression;
41:
42: public ExactMatcher(String expression) {
43: this .expression = expression;
44: }
45:
46: public boolean matches(String input) {
47: if (input == null) {
48: throw new NullPointerException();
49: }
50: return input.equals(expression);
51: }
52:
53: public boolean isExact() {
54: return true;
55: }
56: }
57: }
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