/*
* 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.ignite.ml.math.impls.vector;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import org.apache.ignite.ml.math.Matrix;
import org.apache.ignite.ml.math.Vector;
import org.apache.ignite.ml.math.exceptions.IndexException;
import org.apache.ignite.ml.math.impls.storage.vector.MatrixVectorStorage;
/**
* Row or column vector view off the matrix.
*/
public class MatrixVectorView extends AbstractVector {
/** */
private Matrix parent;
/** */
private int row;
/** */
private int col;
/** */
private int rowStride;
/** */
private int colStride;
/**
*
*/
public MatrixVectorView() {
// No-op.
}
/**
* @param parent Parent matrix.
* @param row Starting row in the view.
* @param col Starting column in the view.
* @param rowStride Rows stride in the view.
* @param colStride Columns stride in the view.
*/
public MatrixVectorView(Matrix parent, int row, int col, int rowStride, int colStride) {
assert parent != null;
if (row < 0 || row >= parent.rowSize())
throw new IndexException(row);
if (col < 0 || col >= parent.columnSize())
throw new IndexException(col);
this.parent = parent;
this.row = row;
this.col = col;
this.rowStride = rowStride;
this.colStride = colStride;
setStorage(new MatrixVectorStorage(parent, row, col, rowStride, colStride));
}
/** {@inheritDoc} */
@Override public Vector copy() {
return new MatrixVectorView(parent, row, col, rowStride, colStride);
}
/** {@inheritDoc} */
@Override public Vector like(int crd) {
return parent.likeVector(crd);
}
/** {@inheritDoc} */
@Override public Matrix likeMatrix(int rows, int cols) {
return parent.like(rows, cols);
}
/** {@inheritDoc} */
@Override public void writeExternal(ObjectOutput out) throws IOException {
super.writeExternal(out);
out.writeObject(parent);
out.writeInt(row);
out.writeInt(col);
out.writeInt(rowStride);
out.writeInt(colStride);
}
/** {@inheritDoc} */
@Override public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
super.readExternal(in);
parent = (Matrix)in.readObject();
row = in.readInt();
col = in.readInt();
rowStride = in.readInt();
colStride = in.readInt();
}
/** {@inheritDoc} */
@Override public int hashCode() {
int res = 1;
res = res * 37 + (parent == null ? 0 : parent.hashCode());
res = res * 37 + row;
res = res * 37 + col;
res = res * 37 + rowStride;
res = res * 37 + colStride;
return res;
}
/** {@inheritDoc} */
@Override public boolean equals(Object o) {
if (this == o)
return true;
if (o == null || getClass() != o.getClass())
return false;
MatrixVectorView that = (MatrixVectorView)o;
return (parent != null ? parent.equals(that.parent) : that.parent == null) &&
row == that.row &&
col == that.col &&
rowStride == that.rowStride &&
colStride == that.colStride;
}
}