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.message; 021 022import org.apache.james.mime4j.MimeException; 023import org.apache.james.mime4j.codec.DecodeMonitor; 024import org.apache.james.mime4j.dom.FieldParser; 025import org.apache.james.mime4j.dom.Header; 026import org.apache.james.mime4j.dom.field.ParsedField; 027import org.apache.james.mime4j.field.LenientFieldParser; 028import org.apache.james.mime4j.parser.AbstractContentHandler; 029import org.apache.james.mime4j.stream.Field; 030 031/** 032 * Abstract implementation of ContentHandler that automates common 033 * tasks. Currently performs header parsing. 034 * 035 * Older versions of this class performed decoding of content streams. 036 * This can be now easily achieved by calling setContentDecoding(true) on the MimeStreamParser. 037 */ 038public abstract class SimpleContentHandler extends AbstractContentHandler { 039 040 private final FieldParser<? extends ParsedField> fieldParser; 041 private final DecodeMonitor monitor; 042 043 public SimpleContentHandler( 044 final FieldParser<? extends ParsedField> fieldParser, 045 final DecodeMonitor monitor) { 046 super(); 047 this.fieldParser = fieldParser != null ? fieldParser : LenientFieldParser.getParser(); 048 this.monitor = monitor != null ? monitor : DecodeMonitor.SILENT; 049 } 050 051 public SimpleContentHandler() { 052 this(null, null); 053 } 054 055 /** 056 * Called after headers are parsed. 057 */ 058 public abstract void headers(Header header); 059 060 /* Implement introduced callbacks. */ 061 062 private Header currHeader; 063 064 /** 065 * @see org.apache.james.mime4j.parser.AbstractContentHandler#startHeader() 066 */ 067 @Override 068 public final void startHeader() { 069 currHeader = new HeaderImpl(); 070 } 071 072 /** 073 * @see org.apache.james.mime4j.parser.AbstractContentHandler#field(Field) 074 */ 075 @Override 076 public final void field(Field field) throws MimeException { 077 ParsedField parsedField; 078 if (field instanceof ParsedField) { 079 parsedField = (ParsedField) field; 080 } else { 081 parsedField = fieldParser.parse(field, monitor); 082 } 083 currHeader.addField(parsedField); 084 } 085 086 /** 087 * @see org.apache.james.mime4j.parser.AbstractContentHandler#endHeader() 088 */ 089 @Override 090 public final void endHeader() { 091 Header tmp = currHeader; 092 currHeader = null; 093 headers(tmp); 094 } 095 096}