001    /****************************************************************
002     * Licensed to the Apache Software Foundation (ASF) under one   *
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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.util.BitSet;
023    
024    import org.apache.james.mime4j.codec.DecodeMonitor;
025    import org.apache.james.mime4j.dom.FieldParser;
026    import org.apache.james.mime4j.dom.field.MimeVersionField;
027    import org.apache.james.mime4j.stream.Field;
028    import org.apache.james.mime4j.stream.ParserCursor;
029    import org.apache.james.mime4j.stream.RawField;
030    import org.apache.james.mime4j.stream.RawFieldParser;
031    import org.apache.james.mime4j.util.ByteSequence;
032    import org.apache.james.mime4j.util.ContentUtil;
033    
034    /**
035     * Represents a <code>MIME-Version</code> field.
036     */
037    public class MimeVersionFieldLenientImpl extends AbstractField implements MimeVersionField {
038    
039        private final static int FULL_STOP  = '.';
040        private final static BitSet DELIM = RawFieldParser.INIT_BITSET(FULL_STOP);
041    
042        public static final int DEFAULT_MINOR_VERSION = 0;
043        public static final int DEFAULT_MAJOR_VERSION = 1;
044    
045        private boolean parsed = false;
046        private int major = DEFAULT_MAJOR_VERSION;
047        private int minor = DEFAULT_MINOR_VERSION;
048    
049        MimeVersionFieldLenientImpl(Field rawField, DecodeMonitor monitor) {
050            super(rawField, monitor);
051        }
052    
053        private void parse() {
054            parsed = true;
055            major = DEFAULT_MAJOR_VERSION;
056            minor = DEFAULT_MINOR_VERSION;
057            RawField f = getRawField();
058            ByteSequence buf = f.getRaw();
059            int pos = f.getDelimiterIdx() + 1;
060            if (buf == null) {
061                String body = f.getBody();
062                if (body == null) {
063                    return;
064                }
065                buf = ContentUtil.encode(body);
066                pos = 0;
067            }
068            RawFieldParser parser = RawFieldParser.DEFAULT;
069            ParserCursor cursor = new ParserCursor(pos, buf.length());
070            String token1 = parser.parseValue(buf, cursor, DELIM);
071            try {
072                major = Integer.parseInt(token1);
073                if (major < 0) {
074                    major = 0;
075                }
076            } catch (NumberFormatException ex) {
077            }
078            if (!cursor.atEnd() && buf.byteAt(cursor.getPos()) == FULL_STOP) {
079                cursor.updatePos(cursor.getPos() + 1);
080            }
081            String token2 = parser.parseValue(buf, cursor, null);
082            try {
083                minor = Integer.parseInt(token2);
084                if (minor < 0) {
085                    minor = 0;
086                }
087            } catch (NumberFormatException ex) {
088            }
089        }
090    
091        public int getMinorVersion() {
092            if (!parsed) {
093                parse();
094            }
095            return minor;
096        }
097    
098        public int getMajorVersion() {
099            if (!parsed) {
100                parse();
101            }
102            return major;
103        }
104    
105        public static final FieldParser<MimeVersionField> PARSER = new FieldParser<MimeVersionField>() {
106    
107            public MimeVersionField parse(final Field rawField, final DecodeMonitor monitor) {
108                return new MimeVersionFieldLenientImpl(rawField, monitor);
109            }
110    
111        };
112    
113    }