/*
* 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.util.ImplHelper;
/**
* A helper to determine the slice identifier of an instance.
*
* @author Pinaki Poddar
*
*/
public class SlicePersistence {
/**
* 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;
}
}