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    package org.apache.tapestry.util;
015    
016    import org.apache.commons.pool.BaseKeyedPoolableObjectFactory;
017    import org.apache.hivemind.util.Defense;
018    
019    
020    /**
021     * Implementation of {@link BaseKeyedPoolableObjectFactory} for regexp patterns
022     * that compiles incoming String regexp patterns into compiled {@link java.util.regex.Pattern}
023     * objects.
024     */
025    public class RegexpPoolObjectFactory extends BaseKeyedPoolableObjectFactory
026    {
027        /**
028         * {@inheritDoc}
029         */
030        public Object makeObject(Object pattern)
031            throws Exception
032        {
033            Defense.notNull(pattern, "Regexp pattern");
034            Defense.isAssignable(pattern, String.class, "Regexp pattern");
035            
036            String regexp = (String)pattern;
037    
038            return java.util.regex.Pattern.compile(regexp, java.util.regex.Pattern.COMMENTS | java.util.regex.Pattern.DOTALL);
039        }
040    
041    }