svn commit: r738271 - /lucene/tika/trunk/src/main/java/org/apache/tika/detect/CompositeDetector.java

[ju...@apache.org]

Author: jukka
Date: Tue Jan 27 22:13:11 2009
New Revision: 738271

URL: http://svn.apache.org/viewvc?rev=738271&view=rev
Log:
TIKA-95: Pluggable magic header detectors

Added a CompositeParser class for combining multiple different detector instances to a functional composite.

Added:
    lucene/tika/trunk/src/main/java/org/apache/tika/detect/CompositeDetector.java

Added: lucene/tika/trunk/src/main/java/org/apache/tika/detect/CompositeDetector.java
URL: http://svn.apache.org/viewvc/lucene/tika/trunk/src/main/java/org/apache/tika/detect/CompositeDetector.java?rev=738271&view=auto
==============================================================================
--- lucene/tika/trunk/src/main/java/org/apache/tika/detect/CompositeDetector.java (added)
+++ lucene/tika/trunk/src/main/java/org/apache/tika/detect/CompositeDetector.java Tue Jan 27 22:13:11 2009
@@ -0,0 +1,49 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.tika.detect;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.List;
+
+import org.apache.tika.metadata.Metadata;
+import org.apache.tika.mime.MediaType;
+
+/**
+ * Content type detector that combines multiple different detection mechanisms.
+ */
+public class CompositeDetector implements Detector {
+
+    private final List<Detector> detectors;
+
+    public CompositeDetector(List<Detector> detectors) {
+        this.detectors = detectors;
+    }
+
+    public MediaType detect(InputStream input, Metadata metadata)
+            throws IOException { 
+        MediaType type = MediaType.OCTET_STREAM;
+        for (Detector detector : detectors) {
+            MediaType detected = detector.detect(input, metadata);
+            if (detected.isSpecializationOf(type)) {
+                type = detected;
+            }
+        }
+        return type;
+    }
+
+}