openjpa-kernel/src/main/java/org/apache/openjpa/kernel/ROPStoreManager.java

/*
 * 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.kernel;

import java.util.BitSet;

import org.apache.openjpa.util.OpenJPAException;
import org.apache.openjpa.util.StoreException;

/**
 * Wraps the native store manager to handle calls using custom
 * {@link PCResultObjectProvider}s.
 *
 * @author Abe White
 */
class ROPStoreManager
    extends DelegatingStoreManager {

    public ROPStoreManager(StoreManager delegate) {
        super(delegate);
    }

    @Override
    public boolean exists(OpenJPAStateManager sm, Object context) {
        if (context instanceof PCResultObjectProvider)
            context = null;
        return super.exists(sm, context);
    }

    @Override
    public boolean initialize(OpenJPAStateManager sm, PCState state,
        FetchConfiguration fetch, Object context) {
        if (context instanceof PCResultObjectProvider) {
            try {
                ((PCResultObjectProvider) context).initialize(sm, state, fetch);
            } catch (OpenJPAException ke) {
                throw ke;
            } catch (Exception e) {
                throw new StoreException(e);
            }
            return true;
        }
        return super.initialize(sm, state, fetch, context);
    }

    @Override
    public boolean syncVersion(OpenJPAStateManager sm, Object context) {
        // the only way this gets called with a rop context is if the
        // rop didn't load any version info on initialize, so just null
        // it out so we don't get unexpected results when our delegate
        // expectes a different context type
        if (context instanceof PCResultObjectProvider)
            context = null;
        return super.syncVersion(sm, context);
    }

    @Override
    public boolean load(OpenJPAStateManager sm, BitSet fields,
        FetchConfiguration fetch, int lockLevel, Object context) {
        // the only way this gets called with a rop context is if the
        // rop didn't load the field on initialize, so just null
        // it out so we don't get unexpected results when our delegate
        // expectes a different context type
        if (context instanceof PCResultObjectProvider)
            context = null;
        return super.load(sm, fields, fetch, lockLevel, context);
    }
}