Tika for metadata extraction

Convert some more metadata extractors to using Tika, and enable the use of 
 the Tika auto-detection parser on any documents without an explicitly
 defined extractor.


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@20667 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/content/metadata/TikaAutoMetadataExtracter.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2005-2010 Alfresco Software Limited.
+ *
+ * This file is part of Alfresco
+ *
+ * Alfresco is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Alfresco is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.alfresco.repo.content.metadata;
+
+import java.util.ArrayList;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.tika.mime.MediaType;
+import org.apache.tika.parser.AutoDetectParser;
+import org.apache.tika.parser.Parser;
+
+/**
+ * A Metadata Extractor which makes use of the Apache
+ *  Tika auto-detection to select the best parser
+ *  to extract the metadata from your document.
+ * This will be used for all files which Tika can
+ *  handle, but where no other more explicit
+ *  extractor is defined. 
+
+ * <pre>
+ *   <b>author:</b>                 --      cm:author
+ *   <b>title:</b>                  --      cm:title
+ *   <b>subject:</b>                --      cm:description
+ *   <b>created:</b>                --      cm:created
+ *   <b>comments:</b>
+ * </pre>
+ * 
+ * @author Nick Burch
+ */
+public class TikaAutoMetadataExtracter extends TikaPoweredMetadataExtracter
+{
+    protected static Log logger = LogFactory.getLog(TikaAutoMetadataExtracter.class);
+
+    public static ArrayList<String> SUPPORTED_MIMETYPES;
+    static {
+       SUPPORTED_MIMETYPES = new ArrayList<String>();
+       AutoDetectParser p = new AutoDetectParser();
+       for(MediaType mt : p.getParsers().keySet()) {
+          SUPPORTED_MIMETYPES.add( mt.toString() );
+       }
+    }
+    
+    public TikaAutoMetadataExtracter()
+    {
+       super(SUPPORTED_MIMETYPES);
+    }
+    
+    /**
+     * Does auto-detection to select the best Tika
+     *  Parser.
+     */
+    @Override
+    protected Parser getParser() {
+       return new AutoDetectParser();
+    }
+}