/**
 * (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.spark;

import org.apache.spark.api.java.JavaPairRDD;
import org.apache.spark.api.java.function.Function;
import com.ibm.bi.dml.runtime.DMLRuntimeException;
import com.ibm.bi.dml.runtime.DMLUnsupportedOperationException;
import com.ibm.bi.dml.runtime.controlprogram.context.ExecutionContext;
import com.ibm.bi.dml.runtime.controlprogram.context.SparkExecutionContext;
import com.ibm.bi.dml.runtime.instructions.cp.CPOperand;
import com.ibm.bi.dml.runtime.matrix.data.MatrixBlock;
import com.ibm.bi.dml.runtime.matrix.data.MatrixIndexes;
import com.ibm.bi.dml.runtime.matrix.operators.Operator;
import com.ibm.bi.dml.runtime.matrix.operators.UnaryOperator;

/**
 * 
 */
public class MatrixBuiltinSPInstruction extends BuiltinUnarySPInstruction
{
	
	public MatrixBuiltinSPInstruction(Operator op, CPOperand in, CPOperand out, String opcode, String instr) {
		super(op, in, out, opcode, instr);
	}

	@Override 
	public void processInstruction(ExecutionContext ec) 
		throws DMLRuntimeException, DMLUnsupportedOperationException 
	{	
		SparkExecutionContext sec = (SparkExecutionContext)ec;
		
		//get input
		JavaPairRDD<MatrixIndexes,MatrixBlock> in = sec.getBinaryBlockRDDHandleForVariable( input1.getName() );
		
		//execute unary builtin operation
		UnaryOperator uop = (UnaryOperator) _optr;
		JavaPairRDD<MatrixIndexes,MatrixBlock> out = in.mapValues(new RDDMatrixBuiltinUnaryOp(uop));
		
		//set output RDD
		updateUnaryOutputMatrixCharacteristics(sec);
		sec.setRDDHandleForVariable(output.getName(), out);	
		sec.addLineageRDD(output.getName(), input1.getName());
	}
	
	/**
	 * 
	 */
	private static class RDDMatrixBuiltinUnaryOp implements Function<MatrixBlock,MatrixBlock> 
	{
		private static final long serialVersionUID = -3128192099832877491L;
		
		private UnaryOperator _op = null;
		
		public RDDMatrixBuiltinUnaryOp(UnaryOperator u_op) {
			_op = u_op;
		}

		@Override
		public MatrixBlock call(MatrixBlock arg0) 
			throws Exception 
		{
			return (MatrixBlock) arg0.unaryOperations(_op, new MatrixBlock());
		}		
	}
}