Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.compressions / src / org / simantics / compressions / Compressions.java

diff --git a/bundles/org.simantics.compressions/src/org/simantics/compressions/Compressions.java b/bundles/org.simantics.compressions/src/org/simantics/compressions/Compressions.java
new file mode 100644 (file)
index 0000000..c13291d
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+++ b/bundles/org.simantics.compressions/src/org/simantics/compressions/Compressions.java
@@ -0,0 +1,92 @@
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2012 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ *     VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.compressions;\r
+\r
+import java.io.File;\r
+import java.io.FileNotFoundException;\r
+import java.io.InputStream;\r
+import java.io.OutputStream;\r
+import java.util.Collection;\r
+import java.util.HashMap;\r
+import java.util.Map;\r
+\r
+import org.osgi.framework.InvalidSyntaxException;\r
+import org.osgi.framework.ServiceReference;\r
+\r
+/**\r
+ * A facade for accessing {@link CompressionCodec} implementations.\r
+ * \r
+ * @author Tuukka Lehtonen\r
+ */\r
+public final class Compressions {\r
+\r
+       private static final Map<String, CompressionCodec> CODECS = new HashMap<>();\r
+    private static boolean initialized = false;\r
+\r
+    public static final String LZ4 = "LZ4";\r
+    public static final String FASTLZ = "FASTLZ";\r
+    \r
+    private static void collectCodecs() {\r
+        try {\r
+            Collection<ServiceReference<CompressionCodec>> serv = Activator.getContext().getServiceReferences(CompressionCodec.class, null);\r
+            for (ServiceReference<CompressionCodec> service : serv) {\r
+                CompressionCodec codec = Activator.getContext().getService(service);\r
+                CODECS.put(codec.getId(), codec);\r
+            }\r
+            initialized = true;\r
+        } catch (InvalidSyntaxException e) {\r
+            e.printStackTrace();\r
+        }\r
+    }\r
+    \r
+       \r
+       /**\r
+        * Get a {@link CompressionCodec} matching the requested name.\r
+        * @param <T>\r
+        * \r
+        * @param codec codec name\r
+        * @return \r
+        * @return matching codec\r
+        * @see #FASTLZ\r
+        * @see #LZ4\r
+        */\r
+       public static CompressionCodec get(String codecId) {\r
+           if (!initialized) {\r
+               collectCodecs();\r
+           }\r
+           CompressionCodec codec = CODECS.get(codecId);\r
+           if (codec == null) {\r
+               throw new IllegalArgumentException("No codec with id " + codecId + " installed");\r
+           }\r
+           return codec;\r
+       }\r
+       \r
+       /**\r
+        * @param codecId\r
+        * @param file\r
+        * @return\r
+        * @throws FileNotFoundException \r
+        */\r
+       public static OutputStream write(String codecId, File file) throws FileNotFoundException {\r
+               return get(codecId).write(file);\r
+       }\r
+\r
+       /**\r
+        * @param codecId\r
+        * @param file\r
+        * @return\r
+        * @throws FileNotFoundException \r
+        */\r
+       public static InputStream read(String codecId, File file) throws FileNotFoundException {\r
+               return get(codecId).read(file);\r
+       }\r
+}
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