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.io.StringReader;
023    import java.util.ArrayList;
024    import java.util.Collections;
025    import java.util.List;
026    
027    import org.apache.james.mime4j.codec.DecodeMonitor;
028    import org.apache.james.mime4j.dom.FieldParser;
029    import org.apache.james.mime4j.dom.field.ContentLanguageField;
030    import org.apache.james.mime4j.field.language.parser.ContentLanguageParser;
031    import org.apache.james.mime4j.field.language.parser.ParseException;
032    import org.apache.james.mime4j.stream.Field;
033    
034    /**
035     * Represents a <code>Content-Transfer-Encoding</code> field.
036     */
037    public 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