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: /**
19: * @author Nikolay A. Kuznetsov
20: * @version $Revision: 1.4.2.2 $
21: */package java.util.regex;
22:
23: import java.util.ArrayList;
24:
25: /**
26: * Positive lookahead node.
27: *
28: * @author Nikolay A. Kuznetsov
29: * @version $Revision: 1.4.2.2 $
30: */
31: class PositiveLookAhead extends AtomicJointSet {
32:
33: public PositiveLookAhead(ArrayList children, FSet fSet) {
34: super (children, fSet);
35: }
36:
37: /**
38: * Returns stringIndex+shift, the next position to match
39: */
40: public int matches(int stringIndex, CharSequence testString,
41: MatchResultImpl matchResult) {
42: int size = children.size();
43: for (int i = 0; i < size; i++) {
44: AbstractSet e = (AbstractSet) children.get(i);
45: int shift = e.matches(stringIndex, testString, matchResult);
46: if (shift >= 0) {
47: // PosLookaheadFset always returns true, position remains the
48: // same
49: // next.match() from;
50: return next.matches(stringIndex, testString,
51: matchResult);
52: }
53: }
54:
55: return -1;
56: }
57:
58: public boolean hasConsumed(MatchResultImpl matchResult) {
59: return false;
60: }
61:
62: protected String getName() {
63: return "PosLookaheadJointSet"; //$NON-NLS-1$
64: }
65: }
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