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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.tika.parser;
18  
19  import java.io.IOException;
20  import java.io.InputStream;
21  import java.util.Collections;
22  import java.util.Set;
23  
24  import org.apache.tika.exception.TikaException;
25  import org.apache.tika.metadata.Metadata;
26  import org.apache.tika.mime.MediaType;
27  import org.apache.tika.sax.XHTMLContentHandler;
28  import org.xml.sax.ContentHandler;
29  import org.xml.sax.SAXException;
30  
31  /**
32   * Dummy parser that always produces an empty XHTML document without even
33   * attempting to parse the given document stream. Useful as a sentinel parser
34   * for unknown document types.
35   */
36  public class EmptyParser implements Parser {
37  
38      /**
39       * Singleton instance of this class.
40       */
41      public static EmptyParser INSTANCE = new EmptyParser();
42  
43      public Set<MediaType> getSupportedTypes(ParseContext context) {
44          return Collections.emptySet();
45      }
46  
47      public void parse(
48              InputStream stream, ContentHandler handler,
49              Metadata metadata, ParseContext context)
50              throws SAXException {
51          XHTMLContentHandler xhtml = new XHTMLContentHandler(handler, metadata);
52          xhtml.startDocument();
53          xhtml.endDocument();
54      }
55  
56      /**
57       * @deprecated This method will be removed in Apache Tika 1.0.
58       */
59      public void parse(
60              InputStream stream, ContentHandler handler, Metadata metadata)
61              throws IOException, SAXException, TikaException {
62          parse(stream, handler, metadata, new ParseContext());
63      }
64  
65  }