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     * Matches a whitespace character.
019     * 
020     * @author mb
021     * @since 4.0
022     */
023    public class WhitespaceMatcher implements ICharacterMatcher
024    {
025    
026        private boolean _matchEndLines;
027    
028        /**
029         * Creates an object that matches all whitespace characters, line
030         * terminators included.
031         */
032        public WhitespaceMatcher()
033        {
034            this(true);
035        }
036    
037        /**
038         * Creates an object that matches whitespace characters. Line terminators
039         * are included only if this is specified.
040         * 
041         * @param matchEndLines
042         *            match line terminators as well
043         */
044        public WhitespaceMatcher(boolean matchEndLines)
045        {
046            _matchEndLines = matchEndLines;
047        }
048    
049        /**
050         * Matches whitespace characters. Line terminators may be matched depending
051         * on the constructor used to create the object.
052         * 
053         * @see org.apache.tapestry.util.text.ICharacterMatcher#matches(char)
054         */
055        public boolean matches(char ch)
056        {
057            if (!_matchEndLines) if (ch == '\n' || ch == '\r') return false;
058    
059            return Character.isWhitespace(ch);
060        }
061    }