/*
* 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.runtime.compress;
import org.apache.sysml.runtime.compress.utils.DblArray;
import org.apache.sysml.runtime.matrix.data.MatrixBlock;
public class ReaderColumnSelectionDense extends ReaderColumnSelection
{
protected MatrixBlock _data;
// reusable return
private DblArray nonZeroReturn;
private DblArray reusableReturn;
private double[] reusableArr;
public ReaderColumnSelectionDense(MatrixBlock data, int[] colIndices, boolean skipZeros) {
super(colIndices, CompressedMatrixBlock.TRANSPOSE_INPUT ?
data.getNumColumns() : data.getNumRows(), skipZeros);
_data = data;
reusableArr = new double[colIndices.length];
reusableReturn = new DblArray(reusableArr);
}
@Override
public DblArray nextRow() {
if( _skipZeros) {
while ((nonZeroReturn = getNextRow()) != null
&& DblArray.isZero(nonZeroReturn));
return nonZeroReturn;
} else {
return getNextRow();
}
}
private DblArray getNextRow() {
if(_lastRow == _numRows-1)
return null;
_lastRow++;
for (int i = 0; i < _colIndexes.length; i++) {
reusableArr[i] = CompressedMatrixBlock.TRANSPOSE_INPUT ?
_data.quickGetValue( _colIndexes[i], _lastRow ) :
_data.quickGetValue( _lastRow, _colIndexes[i] );
}
return reusableReturn;
}
}