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 020package org.apache.james.mime4j.field; 021 022import java.util.HashMap; 023import java.util.Map; 024 025import org.apache.james.mime4j.codec.DecodeMonitor; 026import org.apache.james.mime4j.dom.FieldParser; 027import org.apache.james.mime4j.dom.field.ParsedField; 028import org.apache.james.mime4j.stream.Field; 029 030public 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}