    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    }