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 org.apache.james.mime4j.codec.DecodeMonitor;
023import org.apache.james.mime4j.dom.FieldParser;
024import org.apache.james.mime4j.dom.field.ContentLengthField;
025import org.apache.james.mime4j.stream.Field;
026
027/**
028 * Represents a <code>Content-Length</code> field.
029 */
030public 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}