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 java.io.StringReader;
023
024import org.apache.james.mime4j.MimeException;
025import org.apache.james.mime4j.codec.DecodeMonitor;
026import org.apache.james.mime4j.dom.FieldParser;
027import org.apache.james.mime4j.dom.field.MimeVersionField;
028import org.apache.james.mime4j.field.mimeversion.parser.MimeVersionParser;
029import org.apache.james.mime4j.field.mimeversion.parser.ParseException;
030import org.apache.james.mime4j.stream.Field;
031
032/**
033 * Represents a <code>MIME-Version</code> field.
034 */
035public 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}