com.ibm.bi.dml.runtime.instructions.spark.functions.OuterVectorBinaryOpFunction.java Source code

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Here is the source code for com.ibm.bi.dml.runtime.instructions.spark.functions.OuterVectorBinaryOpFunction.java

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/**
 * (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.functions;

import java.util.Iterator;

import org.apache.spark.api.java.function.PairFlatMapFunction;

import scala.Tuple2;

import com.ibm.bi.dml.runtime.instructions.spark.data.PartitionedBroadcastMatrix;
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.BinaryOperator;

public class OuterVectorBinaryOpFunction
        implements PairFlatMapFunction<Tuple2<MatrixIndexes, MatrixBlock>, MatrixIndexes, MatrixBlock> {
    private static final long serialVersionUID = 1730704346934726826L;

    private BinaryOperator _op;
    private PartitionedBroadcastMatrix _pmV;

    public OuterVectorBinaryOpFunction(BinaryOperator op, PartitionedBroadcastMatrix binput) {
        _op = op;
        _pmV = binput;
    }

    @Override
    public Iterable<Tuple2<MatrixIndexes, MatrixBlock>> call(Tuple2<MatrixIndexes, MatrixBlock> arg0)
            throws Exception {
        return new OuterVectorBinaryOpIterator(arg0);
    }

    /**
     * 
     */
    private class OuterVectorBinaryOpIterator
            implements Iterable<Tuple2<MatrixIndexes, MatrixBlock>>, Iterator<Tuple2<MatrixIndexes, MatrixBlock>> {
        private Tuple2<MatrixIndexes, MatrixBlock> _currBlk = null;
        private int _currPos = -1;

        public OuterVectorBinaryOpIterator(Tuple2<MatrixIndexes, MatrixBlock> in) {
            _currBlk = in;
            _currPos = 1;
        }

        public Iterator<Tuple2<MatrixIndexes, MatrixBlock>> iterator() {
            return this;
        }

        @Override
        public boolean hasNext() {
            return (_currBlk != null && _currPos <= _pmV.getNumColumnBlocks());
        }

        @Override
        public Tuple2<MatrixIndexes, MatrixBlock> next() {
            Tuple2<MatrixIndexes, MatrixBlock> ret = null;

            try {
                //produce next output tuple
                MatrixIndexes ix = _currBlk._1();
                MatrixBlock in1 = _currBlk._2();

                MatrixBlock in2 = _pmV.getMatrixBlock(1, _currPos);
                MatrixBlock resultBlk = (MatrixBlock) in1.binaryOperations(_op, in2, new MatrixBlock());
                resultBlk.examSparsity();
                ret = new Tuple2<MatrixIndexes, MatrixBlock>(new MatrixIndexes(ix.getRowIndex(), _currPos),
                        resultBlk);
                _currPos++;
            } catch (Exception ex) {
                throw new RuntimeException(ex);
            }

            return ret;
        }

        @Override
        public void remove() {
            throw new RuntimeException("Unsupported remove operation.");
        }
    }
}