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.util.ArrayList;
023import java.util.BitSet;
024import java.util.List;
025
026import org.apache.james.mime4j.codec.DecodeMonitor;
027import org.apache.james.mime4j.dom.FieldParser;
028import org.apache.james.mime4j.dom.field.ContentLanguageField;
029import org.apache.james.mime4j.stream.Field;
030import org.apache.james.mime4j.stream.ParserCursor;
031import org.apache.james.mime4j.stream.RawField;
032import org.apache.james.mime4j.stream.RawFieldParser;
033import org.apache.james.mime4j.util.ByteSequence;
034import org.apache.james.mime4j.util.ContentUtil;
035
036/**
037 * Represents a <code>Content-Transfer-Encoding</code> field.
038 */
039public 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