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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.mime;
18  
19  import java.io.ByteArrayInputStream;
20  import java.io.IOException;
21  
22  import org.apache.tika.detect.MagicDetector;
23  import org.apache.tika.metadata.Metadata;
24  
25  /**
26   * Defines a magic match.
27   */
28  class MagicMatch implements Clause {
29  
30      private final MagicDetector detector;
31  
32      private final int length;
33  
34      MagicMatch(MagicDetector detector, int length) throws MimeTypeException {
35          this.detector = detector;
36          this.length = length;
37      }
38  
39      public boolean eval(byte[] data) {
40          try {
41              return detector.detect(
42                      new ByteArrayInputStream(data), new Metadata())
43                      != MediaType.OCTET_STREAM;
44          } catch (IOException e) {
45              // Should never happen with a ByteArrayInputStream
46              return false;
47          }
48      }
49  
50      public int size() {
51          return length;
52      }
53  
54      public String toString() {
55          return detector.toString();
56      }
57  
58  }