001/*-------------------------------------------------------------------------+
002|                                                                          |
003| Copyright 2005-2011 the ConQAT Project                                   |
004|                                                                          |
005| Licensed under the Apache License, Version 2.0 (the "License");          |
006| you may not use this file except in compliance with the License.         |
007| You may obtain a copy of the License at                                  |
008|                                                                          |
009|    http://www.apache.org/licenses/LICENSE-2.0                            |
010|                                                                          |
011| Unless required by applicable law or agreed to in writing, software      |
012| distributed under the License is distributed on an "AS IS" BASIS,        |
013| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
014| See the License for the specific language governing permissions and      |
015| limitations under the License.                                           |
016+-------------------------------------------------------------------------*/
017package eu.cqse.check.framework.util.tokens;
018
019/**
020 * Matches if the given pattern does not match. Does not advance the token
021 * stream.
022 */
023public class NotFollowedByPattern extends ZeroLengthTokenPatternBase {
024
025        /** The matcher that should not match at the current position. */
026        private final TokenPatternBase matcher;
027
028        /** Constructor. */
029        public NotFollowedByPattern(TokenPatternBase matcher) {
030                this.matcher = matcher;
031        }
032
033        /** {@inheritDoc} */
034        @Override
035        protected boolean conditionApplies(TokenStream stream) {
036                if (stream.isExhausted()) {
037                        return true;
038                }
039                return matcher.matches(stream) == null;
040        }
041
042        /** {@inheritDoc} */
043        @Override
044        public String toString() {
045                return "NotFollowedBy " + matcher.toString();
046        }
047}