001    // Copyright 2004, 2005 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry.util.text;
016    
017    /**
018     * An object for matching a set of provided ASCII characters.
019     * 
020     * @author mb
021     * @since 4.0
022     */
023    public class AsciiCharacterMatcher implements ICharacterMatcher 
024    {
025        private boolean[] _charMap;
026        
027        /**
028         * Create a new ASCII character matcher for identifying the set of provided ASCII characters.
029         * 
030         * @param chars the character that this matcher should identify
031         */
032        public AsciiCharacterMatcher(String chars) {
033            _charMap = new boolean[128];
034            for (int i = 0; i < chars.length(); i++) {
035                char ch = chars.charAt(i);
036                if (ch > 127)
037                    continue;
038                _charMap[ch] = true;
039            }
040        }
041        
042        /**
043         * Match the characters provided in the constructor.
044         * 
045         * @see org.apache.tapestry.util.text.ICharacterMatcher#matches(char)
046         */
047        public boolean matches(char ch)
048        {
049            if (ch > 127)
050                return false;
051            return _charMap[ch];
052        }
053    }