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.util.ArrayList;
023    import java.util.BitSet;
024    import java.util.List;
025    
026    import org.apache.james.mime4j.codec.DecodeMonitor;
027    import org.apache.james.mime4j.dom.FieldParser;
028    import org.apache.james.mime4j.dom.field.ContentLanguageField;
029    import org.apache.james.mime4j.stream.Field;
030    import org.apache.james.mime4j.stream.ParserCursor;
031    import org.apache.james.mime4j.stream.RawField;
032    import org.apache.james.mime4j.stream.RawFieldParser;
033    import org.apache.james.mime4j.util.ByteSequence;
034    import org.apache.james.mime4j.util.ContentUtil;
035    
036    /**
037     * Represents a <code>Content-Transfer-Encoding</code> field.
038     */
039    public class ContentLanguageFieldLenientImpl extends AbstractField implements ContentLanguageField {
040    
041        private final static int   COMMA = ',';
042        private final static BitSet DELIM = RawFieldParser.INIT_BITSET(COMMA);
043    
044        private boolean parsed = false;
045        private List<String> languages;
046    
047        ContentLanguageFieldLenientImpl(final Field rawField, final DecodeMonitor monitor) {
048            super(rawField, monitor);
049        }
050    
051        private void parse() {
052            parsed = true;
053            languages = new ArrayList<String>();
054            RawField f = getRawField();
055            ByteSequence buf = f.getRaw();
056            int pos = f.getDelimiterIdx() + 1;
057            if (buf == null) {
058                String body = f.getBody();
059                if (body == null) {
060                    return;
061                }
062                buf = ContentUtil.encode(body);
063                pos = 0;
064            }
065            RawFieldParser parser = RawFieldParser.DEFAULT;
066            ParserCursor cursor = new ParserCursor(pos, buf.length());
067            for (;;) {
068                String token = parser.parseToken(buf, cursor, DELIM);
069                if (token.length() > 0) {
070                    languages.add(token);
071                }
072                if (cursor.atEnd()) {
073                    break;
074                } else {
075                    pos = cursor.getPos();
076                    if (buf.byteAt(pos) == COMMA) {
077                        cursor.updatePos(pos + 1);
078                    }
079                }
080            }
081        }
082    
083        public List<String> getLanguages() {
084            if (!parsed) {
085                parse();
086            }
087            return new ArrayList<String>(languages);
088        }
089    
090        public static final FieldParser<ContentLanguageField> PARSER = new FieldParser<ContentLanguageField>() {
091    
092            public ContentLanguageField parse(final Field rawField, final DecodeMonitor monitor) {
093                return new ContentLanguageFieldLenientImpl(rawField, monitor);
094            }
095    
096        };
097    
098    }
099