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;
023import java.util.ArrayList;
024import java.util.Collections;
025import java.util.List;
026
027import org.apache.james.mime4j.codec.DecodeMonitor;
028import org.apache.james.mime4j.dom.FieldParser;
029import org.apache.james.mime4j.dom.field.ContentLanguageField;
030import org.apache.james.mime4j.field.language.parser.ContentLanguageParser;
031import org.apache.james.mime4j.field.language.parser.ParseException;
032import org.apache.james.mime4j.stream.Field;
033
034/**
035 * Represents a <code>Content-Transfer-Encoding</code> field.
036 */
037public class ContentLanguageFieldImpl extends AbstractField implements ContentLanguageField {
038
039    private boolean parsed = false;
040    private List<String> languages;
041    private ParseException parseException;
042
043    ContentLanguageFieldImpl(Field rawField, DecodeMonitor monitor) {
044        super(rawField, monitor);
045    }
046
047    private void parse() {
048        parsed = true;
049        languages = Collections.<String>emptyList();
050        String body = getBody();
051        if (body != null) {
052            ContentLanguageParser parser = new ContentLanguageParser(new StringReader(body));
053            try {
054                languages = parser.parse();
055            } catch (ParseException ex) {
056                parseException = ex;
057            }
058        }
059    }
060
061    @Override
062    public org.apache.james.mime4j.dom.field.ParseException getParseException() {
063        return parseException;
064    }
065
066    public List<String> getLanguages() {
067        if (!parsed) {
068            parse();
069        }
070        return new ArrayList<String>(languages);
071    }
072
073    public static final FieldParser<ContentLanguageField> PARSER = new FieldParser<ContentLanguageField>() {
074
075        public ContentLanguageField parse(final Field rawField, final DecodeMonitor monitor) {
076            return new ContentLanguageFieldImpl(rawField, monitor);
077        }
078
079    };
080
081}
082