001    // Copyright 2006, 2007, 2008 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.tapestry5.ioc.internal;
016    
017    import java.util.regex.Pattern;
018    
019    /**
020     * Used when matching identifiers.  In the early days of T5 IoC, matching was based on shell-style glob matches (a '*'
021     * could represent zero or more characters).  But that was limiting so now we check to see if the provided pattern looks
022     * like a glob (just characters and asterisks, for compatibility with older code) and, if not, we assume it is a regular
023     * expression.
024     */
025    public class GlobPatternMatcher
026    {
027        private final Pattern pattern;
028    
029        private final static Pattern oldStyleGlob =
030                Pattern.compile("[a-z\\*]+", Pattern.CASE_INSENSITIVE);
031    
032        public GlobPatternMatcher(String pattern)
033        {
034            this.pattern = compilePattern(pattern);
035        }
036    
037        private static Pattern compilePattern(String pattern)
038        {
039            return Pattern.compile(createRegexpFromGlob(pattern), Pattern.CASE_INSENSITIVE);
040        }
041    
042        private static String createRegexpFromGlob(String pattern)
043        {
044            return oldStyleGlob.matcher(pattern).matches()
045                   ? pattern.replace("*", ".*")
046                   : pattern;
047        }
048    
049    
050        public boolean matches(String input)
051        {
052            return pattern.matcher(input).matches();
053        }
054    }