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
015package org.apache.tapestry5.ioc.internal;
016
017import 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 */
025public 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}