/*
 * 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.sysml.lops;

import org.apache.sysml.lops.LopProperties.ExecLocation;
import org.apache.sysml.lops.LopProperties.ExecType;
import org.apache.sysml.lops.compile.JobType;
import org.apache.sysml.parser.Expression.*;

/**
 * Lop to represent a grouping operation.
 */

public class Group extends Lop  
{
	public enum OperationTypes {Sort};
	
	OperationTypes operation;
	
	/**
	 * Constructor to create a grouping operation.
	 * 
	 * @param input low-level operator
	 * @param op group operation type
	 * @param dt data type
	 * @param vt value type
	 */
	public Group(Lop input, Group.OperationTypes op, DataType dt, ValueType vt) 
	{
		super(Lop.Type.Grouping, dt, vt);		
		operation = op;
		this.addInput(input);
		input.addOutput(this);
		
		/*
		 *  This lop can be executed in only in GMR and RAND.
		 *  MMCJ, REBLOCK, and PARTITION themselves has location MapAndReduce.
		 */
		lps.addCompatibility(JobType.GMR);
		lps.addCompatibility(JobType.DATAGEN);
		
		boolean breaksAlignment = false;
		boolean aligner = true;
		boolean definesMRJob = true;
		
		this.lps.setProperties ( inputs, ExecType.MR, ExecLocation.MapAndReduce, breaksAlignment, aligner, definesMRJob );
	}

	@Override
	public String toString() {
		return "Operation: " + operation;
	}
}