/**
 * (C) Copyright IBM Corp. 2010, 2015
 *
 * 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 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 com.ibm.bi.dml.runtime.instructions.mr;

import com.ibm.bi.dml.runtime.DMLRuntimeException;
import com.ibm.bi.dml.runtime.DMLUnsupportedOperationException;
import com.ibm.bi.dml.runtime.instructions.Instruction;
import com.ibm.bi.dml.runtime.instructions.InstructionUtils;
import com.ibm.bi.dml.runtime.matrix.data.MatrixValue;
import com.ibm.bi.dml.runtime.matrix.mapred.CachedValueMap;
import com.ibm.bi.dml.runtime.matrix.mapred.IndexedMatrixValue;
import com.ibm.bi.dml.runtime.matrix.operators.AggregateOperator;
import com.ibm.bi.dml.runtime.matrix.operators.Operator;


public class AggregateInstruction extends UnaryMRInstructionBase 
{
		
	public AggregateInstruction(Operator op, byte in, byte out, String istr)
	{
		super(op, in, out);
		mrtype = MRINSTRUCTION_TYPE.Aggregate;
		instString = istr;
	}
	
	public static Instruction parseInstruction ( String str ) 
		throws DMLRuntimeException 
	{	
		String[] parts = InstructionUtils.getInstructionParts ( str );
		
		byte in, out;
		String opcode = parts[0];
		in = Byte.parseByte(parts[1]);
		out = Byte.parseByte(parts[2]);
		
		AggregateOperator agg = null;
		if(opcode.equalsIgnoreCase("ak+") || opcode.equalsIgnoreCase("asqk+")
				|| opcode.equalsIgnoreCase("amean")) {
			InstructionUtils.checkNumFields ( str, 4 );
			agg = InstructionUtils.parseAggregateOperator(opcode, parts[3], parts[4]);
		}
		else {
			InstructionUtils.checkNumFields ( str, 2 );
			agg = InstructionUtils.parseAggregateOperator(opcode, null, null);	
		}
		
		return new AggregateInstruction(agg, in, out, str);
	}

	@Override
	public void processInstruction(Class<? extends MatrixValue> valueClass,
			CachedValueMap cachedValues, IndexedMatrixValue tempValue,
			IndexedMatrixValue zeroInput, int blockRowFactor, int blockColFactor)
			throws DMLUnsupportedOperationException, DMLRuntimeException {
		
		throw new DMLRuntimeException("no processInstruction for AggregateInstruction!");
		
	}

}