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 java.io.StringReader;
023    
024    import org.apache.james.mime4j.MimeException;
025    import org.apache.james.mime4j.codec.DecodeMonitor;
026    import org.apache.james.mime4j.dom.FieldParser;
027    import org.apache.james.mime4j.dom.field.MimeVersionField;
028    import org.apache.james.mime4j.field.mimeversion.parser.MimeVersionParser;
029    import org.apache.james.mime4j.field.mimeversion.parser.ParseException;
030    import org.apache.james.mime4j.stream.Field;
031    
032    /**
033     * Represents a <code>MIME-Version</code> field.
034     */
035    public class MimeVersionFieldImpl extends AbstractField implements MimeVersionField {
036    
037        public static final int DEFAULT_MINOR_VERSION = 0;
038        public static final int DEFAULT_MAJOR_VERSION = 1;
039    
040        private boolean parsed = false;
041        private int major = DEFAULT_MAJOR_VERSION;
042        private int minor = DEFAULT_MINOR_VERSION;
043        private ParseException parsedException;
044    
045        MimeVersionFieldImpl(Field rawField, DecodeMonitor monitor) {
046            super(rawField, monitor);
047        }
048    
049        private void parse() {
050            parsed = true;
051            major = DEFAULT_MAJOR_VERSION;
052            minor = DEFAULT_MINOR_VERSION;
053            String body = getBody();
054            if (body != null) {
055                StringReader reader = new StringReader(body);
056                MimeVersionParser parser = new MimeVersionParser(reader);
057                try {
058                    parser.parse();
059                    int v = parser.getMajorVersion();
060                    if (v != MimeVersionParser.INITIAL_VERSION_VALUE) {
061                        major = v;
062                    }
063                    v = parser.getMinorVersion();
064                    if (v != MimeVersionParser.INITIAL_VERSION_VALUE) {
065                        minor = v;
066                    }
067                } catch (MimeException ex) {
068                    parsedException = new ParseException(ex);
069                }
070            }
071        }
072    
073        public int getMinorVersion() {
074            if (!parsed) {
075                parse();
076            }
077            return minor;
078        }
079    
080        public int getMajorVersion() {
081            if (!parsed) {
082                parse();
083            }
084            return major;
085        }
086    
087        @Override
088        public org.apache.james.mime4j.dom.field.ParseException getParseException() {
089            return parsedException;
090        }
091    
092        public static final FieldParser<MimeVersionField> PARSER = new FieldParser<MimeVersionField>() {
093    
094            public MimeVersionField parse(final Field rawField, final DecodeMonitor monitor) {
095                return new MimeVersionFieldImpl(rawField, monitor);
096            }
097    
098        };
099    
100    }