hyracks/hyracks-storage-am-common/src/main/java/edu/uci/ics/hyracks/storage/am/common/impls/NoOpOperationCallbackFactory.java

/*
 * Copyright 2009-2013 by The Regents of the University of California
 * Licensed 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 from
 * 
 *     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 edu.uci.ics.hyracks.storage.am.common.impls;

import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
import edu.uci.ics.hyracks.storage.am.common.api.IModificationOperationCallback;
import edu.uci.ics.hyracks.storage.am.common.api.IModificationOperationCallbackFactory;
import edu.uci.ics.hyracks.storage.am.common.api.ISearchOperationCallback;
import edu.uci.ics.hyracks.storage.am.common.api.ISearchOperationCallbackFactory;

/**
 * Dummy NoOp callback factory used primarily for testing. Always returns the {@link NoOpOperationCallback} instance.
 * Implemented as an enum to preserve singleton model while being serializable
 */
public enum NoOpOperationCallbackFactory implements ISearchOperationCallbackFactory,
        IModificationOperationCallbackFactory {
    INSTANCE;

    @Override
    public IModificationOperationCallback createModificationOperationCallback(long resourceId, Object resource, IHyracksTaskContext ctx) {
        return NoOpOperationCallback.INSTANCE;
    }

    @Override
    public ISearchOperationCallback createSearchOperationCallback(long resourceId, IHyracksTaskContext ctx) {
        return NoOpOperationCallback.INSTANCE;
    }
}