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.codec.DecodeMonitor;
026 import org.apache.james.mime4j.dom.FieldParser;
027 import org.apache.james.mime4j.dom.field.ParsedField;
028 import org.apache.james.mime4j.stream.Field;
029
030 public class DelegatingFieldParser implements FieldParser<ParsedField> {
031
032 private final FieldParser<? extends ParsedField> defaultParser;
033 private final Map<String, FieldParser<? extends ParsedField>> parsers;
034
035 public DelegatingFieldParser(final FieldParser<? extends ParsedField> defaultParser) {
036 super();
037 this.defaultParser = defaultParser;
038 this.parsers = new HashMap<String, FieldParser<? extends ParsedField>>();
039 }
040
041 /**
042 * Sets the parser used for the field named <code>name</code>.
043 * @param name the name of the field
044 * @param parser the parser for fields named <code>name</code>
045 */
046 public void setFieldParser(final String name, final FieldParser<? extends ParsedField> parser) {
047 parsers.put(name.toLowerCase(), parser);
048 }
049
050 public FieldParser<? extends ParsedField> getParser(final String name) {
051 final FieldParser<? extends ParsedField> field = parsers.get(name.toLowerCase());
052 if (field == null) {
053 return defaultParser;
054 }
055 return field;
056 }
057
058 public ParsedField parse(final Field rawField, final DecodeMonitor monitor) {
059 final FieldParser<? extends ParsedField> parser = getParser(rawField.getName());
060 return parser.parse(rawField, monitor);
061 }
062 }