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 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    }