/*
 * 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 org.apache.hyracks.algebricks.core.algebra.operators.physical;

import java.util.ArrayList;

import org.apache.hyracks.algebricks.common.utils.Pair;
import org.apache.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder.TargetConstraint;
import org.apache.hyracks.algebricks.core.algebra.base.ILogicalOperator;
import org.apache.hyracks.algebricks.core.algebra.base.IOptimizationContext;
import org.apache.hyracks.algebricks.core.algebra.base.PhysicalOperatorTag;
import org.apache.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
import org.apache.hyracks.algebricks.core.algebra.properties.ILocalStructuralProperty;
import org.apache.hyracks.algebricks.core.algebra.properties.IPartitioningProperty;
import org.apache.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
import org.apache.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
import org.apache.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
import org.apache.hyracks.algebricks.core.jobgen.impl.JobGenContext;
import org.apache.hyracks.api.dataflow.IConnectorDescriptor;
import org.apache.hyracks.api.job.IConnectorDescriptorRegistry;
import org.apache.hyracks.dataflow.std.connectors.MToNReplicatingConnectorDescriptor;

public class RandomMergeExchangePOperator extends AbstractExchangePOperator {

    @Override
    public PhysicalOperatorTag getOperatorTag() {
        return PhysicalOperatorTag.RANDOM_MERGE_EXCHANGE;
    }

    @Override
    public void computeDeliveredProperties(ILogicalOperator op, IOptimizationContext context) {
        this.deliveredProperties = new StructuralPropertiesVector(IPartitioningProperty.UNPARTITIONED,
                new ArrayList<ILocalStructuralProperty>(0));
    }

    @Override
    public PhysicalRequirements getRequiredPropertiesForChildren(ILogicalOperator op,
            IPhysicalPropertiesVector reqdByParent) {
        return emptyUnaryRequirements();
    }

    @Override
    public Pair<IConnectorDescriptor, TargetConstraint> createConnectorDescriptor(IConnectorDescriptorRegistry spec,
            ILogicalOperator op, IOperatorSchema opSchema, JobGenContext context) {
        IConnectorDescriptor conn = new MToNReplicatingConnectorDescriptor(spec);
        return new Pair<IConnectorDescriptor, TargetConstraint>(conn, TargetConstraint.ONE);
    }
}
