/*
* 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.storage.matrix;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import org.apache.ignite.ml.math.MatrixStorage;
/**
* {@link MatrixStorage} implementation that delegates to parent matrix.
*/
public class MatrixDelegateStorage implements MatrixStorage {
/** Parent matrix storage. */
private MatrixStorage sto;
/** Row offset in the parent matrix. */
private int rowOff;
/** Column offset in the parent matrix. */
private int colOff;
/** Amount of rows in the matrix. */
private int rows;
/** Amount of columns in the matrix. */
private int cols;
/**
*
*/
public MatrixDelegateStorage() {
// No-op.
}
/**
* @param sto Backing parent storage.
* @param rowOff Row offset to parent matrix.
* @param colOff Column offset to parent matrix.
* @param rows Amount of rows in the view.
* @param cols Amount of columns in the view.
*/
public MatrixDelegateStorage(MatrixStorage sto, int rowOff, int colOff, int rows, int cols) {
assert sto != null;
assert rowOff >= 0;
assert colOff >= 0;
assert rows > 0;
assert cols > 0;
this.sto = sto;
this.rowOff = rowOff;
this.colOff = colOff;
this.rows = rows;
this.cols = cols;
}
/**
*
*/
public MatrixStorage delegate() {
return sto;
}
/**
*
*/
public int rowOffset() {
return rowOff;
}
/**
*
*/
public int columnOffset() {
return colOff;
}
/**
*
*/
public int rowsLength() {
return rows;
}
/**
*
*/
public int columnsLength() {
return cols;
}
/** {@inheritDoc} */
@Override public double get(int x, int y) {
return sto.get(rowOff + x, colOff + y);
}
/** {@inheritDoc} */
@Override public void set(int x, int y, double v) {
sto.set(rowOff + x, colOff + y, v);
}
/** {@inheritDoc} */
@Override public int columnSize() {
return cols;
}
/** {@inheritDoc} */
@Override public int rowSize() {
return rows;
}
/** {@inheritDoc} */
@Override public boolean isArrayBased() {
return sto.isArrayBased() && rowOff == 0 && colOff == 0;
}
/** {@inheritDoc} */
@Override public boolean isSequentialAccess() {
return sto.isSequentialAccess();
}
/** {@inheritDoc} */
@Override public boolean isDense() {
return sto.isDense();
}
/** {@inheritDoc} */
@Override public boolean isRandomAccess() {
return sto.isRandomAccess();
}
/** {@inheritDoc} */
@Override public boolean isDistributed() {
return sto.isDistributed();
}
/** {@inheritDoc} */
@Override public double[][] data() {
return sto.data();
}
/** {@inheritDoc} */
@Override public void writeExternal(ObjectOutput out) throws IOException {
out.writeObject(sto);
out.writeInt(rowOff);
out.writeInt(colOff);
out.writeInt(rows);
out.writeInt(cols);
}
/** {@inheritDoc} */
@Override public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
sto = (MatrixStorage)in.readObject();
rowOff = in.readInt();
colOff = in.readInt();
rows = in.readInt();
cols = in.readInt();
}
/** {@inheritDoc} */
@Override public int hashCode() {
int res = 1;
res = res * 37 + rows;
res = res * 37 + cols;
res = res * 37 + rowOff;
res = res * 37 + colOff;
res = res * 37 + sto.hashCode();
return res;
}
/** {@inheritDoc} */
@Override public boolean equals(Object o) {
if (this == o)
return true;
if (o == null || getClass() != o.getClass())
return false;
MatrixDelegateStorage that = (MatrixDelegateStorage)o;
return rows == that.rows && cols == that.cols && rowOff == that.rowOff && colOff == that.colOff &&
(sto != null ? sto.equals(that.sto) : that.sto == null);
}
}