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: * A matcher that matches nothing.
22: */
23: public final/* @Immutable */class NoMatcher implements Matcher {
24:
25: public static final Matcher INSTANCE = new NoMatcher();
26:
27: public NoMatcher() {
28: }
29:
30: public boolean matches(String input) {
31: if (input == null) {
32: throw new NullPointerException();
33: }
34: return false;
35: }
36:
37: public boolean isExact() {
38: return true;
39: }
40:
41: }
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