001    /****************************************************************
002     * Licensed to the Apache Software Foundation (ASF) under one   *
003     * or more contributor license agreements.  See the NOTICE file *
004     * distributed with this work for additional information        *
005     * regarding copyright ownership.  The ASF licenses this file   *
006     * to you under the Apache License, Version 2.0 (the            *
007     * "License"); you may not use this file except in compliance   *
008     * with the License.  You may obtain a copy of the License at   *
009     *                                                              *
010     *   http://www.apache.org/licenses/LICENSE-2.0                 *
011     *                                                              *
012     * Unless required by applicable law or agreed to in writing,   *
013     * software distributed under the License is distributed on an  *
014     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
015     * KIND, either express or implied.  See the License for the    *
016     * specific language governing permissions and limitations      *
017     * under the License.                                           *
018     ****************************************************************/
019    
020    package org.apache.james.mime4j.field;
021    
022    import java.util.HashMap;
023    import java.util.Map;
024    
025    import org.apache.james.mime4j.util.ByteSequence;
026    
027    public class DelegatingFieldParser implements FieldParser {
028        
029        private Map<String, FieldParser> parsers = new HashMap<String, FieldParser>();
030        private FieldParser defaultParser = UnstructuredField.PARSER;
031        
032        /**
033         * Sets the parser used for the field named <code>name</code>.
034         * @param name the name of the field
035         * @param parser the parser for fields named <code>name</code>
036         */
037        public void setFieldParser(final String name, final FieldParser parser) {
038            parsers.put(name.toLowerCase(), parser);
039        }
040        
041        public FieldParser getParser(final String name) {
042            final FieldParser field = parsers.get(name.toLowerCase());
043            if(field==null) {
044                return defaultParser;
045            }
046            return field;
047        }
048        
049        public ParsedField parse(final String name, final String body, final ByteSequence raw) {
050            final FieldParser parser = getParser(name);
051            return parser.parse(name, body, raw);
052        }
053    }