svn commit: r606983 - /labs/fluid/slice/src/main/java/org/apache/openjpa/slice/SlicePersistence.java

[pp...@apache.org]

Author: ppoddar
Date: Wed Dec 26 16:30:53 2007
New Revision: 606983

URL: http://svn.apache.org/viewvc?rev=606983&view=rev
Log:
Add a Helper to determine slice identifier

Added:
    labs/fluid/slice/src/main/java/org/apache/openjpa/slice/SlicePersistence.java

Added: labs/fluid/slice/src/main/java/org/apache/openjpa/slice/SlicePersistence.java
URL: http://svn.apache.org/viewvc/labs/fluid/slice/src/main/java/org/apache/openjpa/slice/SlicePersistence.java?rev=606983&view=auto
==============================================================================
--- labs/fluid/slice/src/main/java/org/apache/openjpa/slice/SlicePersistence.java (added)
+++ labs/fluid/slice/src/main/java/org/apache/openjpa/slice/SlicePersistence.java Wed Dec 26 16:30:53 2007
@@ -0,0 +1,51 @@
+/*
+ * 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.openjpa.slice;
+
+import org.apache.openjpa.enhance.PersistenceCapable;
+import org.apache.openjpa.kernel.StateManagerImpl;
+import org.apache.openjpa.persistence.OpenJPAPersistence;
+import org.apache.openjpa.util.ImplHelper;
+
+/**
+ * A helper to determine the slice identifier of an instance.
+ * 
+ * @author Pinaki Poddar 
+ *
+ */
+public class SlicePersistence extends OpenJPAPersistence {
+	/**
+	 * Get the slice identifier for the given instance if it is a managed
+	 * instance and has been assigned to a slice.
+	 * 
+	 * @return name of the slice, if any. null otherwise.
+	 */
+	public static String getSlice(Object obj) {
+		if (obj == null)
+			return null;
+		PersistenceCapable pc = ImplHelper.toPersistenceCapable(obj, null);
+		if (pc == null)
+			return null;
+		StateManagerImpl sm = (StateManagerImpl)pc.pcGetStateManager();
+		if (sm == null)
+			return null;
+		Object slice = sm.getImplData();
+		return (slice instanceof String) ? (String)slice : null;
+	}
+}



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