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 *
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015 * KIND, either express or implied. See the License for the *
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019
020 package org.apache.james.mime4j.field;
021
022 import org.apache.james.mime4j.codec.DecodeMonitor;
023 import org.apache.james.mime4j.dom.FieldParser;
024 import org.apache.james.mime4j.dom.field.ContentLengthField;
025 import org.apache.james.mime4j.stream.Field;
026
027 /**
028 * Represents a <code>Content-Length</code> field.
029 */
030 public class ContentLengthFieldImpl extends AbstractField implements ContentLengthField {
031
032 private boolean parsed = false;
033 private long contentLength;
034
035 ContentLengthFieldImpl(Field rawField, DecodeMonitor monitor) {
036 super(rawField, monitor);
037 }
038
039 private void parse() {
040 parsed = true;
041 contentLength = -1;
042 String body = getBody();
043 if (body != null) {
044 try {
045 contentLength = Long.parseLong(body);
046 if (contentLength < 0) {
047 contentLength = -1;
048 if (monitor.isListening()) {
049 monitor.warn("Negative content length: " + body,
050 "ignoring Content-Length header");
051 }
052 }
053 } catch (NumberFormatException e) {
054 if (monitor.isListening()) {
055 monitor.warn("Invalid content length: " + body,
056 "ignoring Content-Length header");
057 }
058 }
059 }
060 }
061
062 public long getContentLength() {
063 if (!parsed) {
064 parse();
065 }
066 return contentLength;
067 }
068
069 public static final FieldParser<ContentLengthField> PARSER = new FieldParser<ContentLengthField>() {
070
071 public ContentLengthField parse(final Field rawField, final DecodeMonitor monitor) {
072 return new ContentLengthFieldImpl(rawField, monitor);
073 }
074
075 };
076 }