/*
* 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.matrix;
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.MatrixStorage;
import org.apache.ignite.ml.math.Vector;
import org.apache.ignite.ml.math.exceptions.IndexException;
import org.apache.ignite.ml.math.exceptions.UnsupportedOperationException;
import org.apache.ignite.ml.math.impls.storage.matrix.PivotedMatrixStorage;
import org.apache.ignite.ml.math.impls.vector.PivotedVectorView;
/**
* Pivoted (index mapped) view over another matrix implementation.
*/
public class PivotedMatrixView extends AbstractMatrix {
/** Pivoted matrix. */
private Matrix mtx;
/**
*
*/
public PivotedMatrixView() {
// No-op.
}
/**
* @param mtx Parent matrix.
* @param rowPivot Pivot array for rows.
* @param colPivot Pivot array for columns.
*/
public PivotedMatrixView(Matrix mtx, int[] rowPivot, int[] colPivot) {
super(new PivotedMatrixStorage(mtx == null ? null : mtx.getStorage(), rowPivot, colPivot));
this.mtx = mtx;
}
/**
* @param mtx Parent matrix.
*/
public PivotedMatrixView(Matrix mtx) {
super(new PivotedMatrixStorage(mtx == null ? null : mtx.getStorage()));
this.mtx = mtx;
}
/**
* @param mtx Parent matrix.
* @param pivot Pivot array for rows and columns.
*/
public PivotedMatrixView(Matrix mtx, int[] pivot) {
super(new PivotedMatrixStorage(mtx == null ? null : mtx.getStorage(), pivot));
this.mtx = mtx;
}
/**
* Swaps indexes {@code i} and {@code j} for both both row and column.
*
* @param i First index to swap.
* @param j Second index to swap.
*/
public Matrix swap(int i, int j) {
swapRows(i, j);
swapColumns(i, j);
return this;
}
/** {@inheritDoc} */
@Override public Matrix swapRows(int i, int j) {
if (i < 0 || i >= storage().rowPivot().length)
throw new IndexException(i);
if (j < 0 || j >= storage().rowPivot().length)
throw new IndexException(j);
storage().swapRows(i, j);
return this;
}
/** {@inheritDoc} */
@Override public Matrix swapColumns(int i, int j) {
if (i < 0 || i >= storage().columnPivot().length)
throw new IndexException(i);
if (j < 0 || j >= storage().columnPivot().length)
throw new IndexException(j);
storage().swapColumns(i, j);
return this;
}
/** {@inheritDoc} */
@Override public Vector viewRow(int row) {
return new PivotedVectorView(
mtx.viewRow(storage().rowPivot()[row]),
storage().columnPivot(),
storage().columnUnpivot()
);
}
/** {@inheritDoc} */
@Override public Vector viewColumn(int col) {
return new PivotedVectorView(
mtx.viewColumn(storage().columnPivot()[col]),
storage().rowPivot(),
storage().rowUnpivot()
);
}
/**
* @return Parent matrix.
*/
public Matrix getBaseMatrix() {
return mtx;
}
/**
* @return Pivot array for rows.
*/
public int[] rowPivot() {
return storage().rowPivot();
}
/**
* @return Pivot array for columns.
*/
public int[] columnPivot() {
return storage().columnPivot();
}
/**
* @param i Index for row pivot.
* @return Row pivot for given index.
*/
public int rowPivot(int i) {
return storage().rowPivot()[i];
}
/**
* @param i Index for column pivot.
* @return Column pivot for given index.
*/
public int columnPivot(int i) {
return storage().columnPivot()[i];
}
/**
* @param i Index for row unpivot.
* @return Row unpivot for given index.
*/
public int rowUnpivot(int i) {
return storage().rowUnpivot()[i];
}
/**
* @param i Index for column unpivot.
* @return Column unpivot for given index.
*/
public int columnUnpivot(int i) {
return storage().columnUnpivot()[i];
}
/** {@inheritDoc} */
@Override public void writeExternal(ObjectOutput out) throws IOException {
super.writeExternal(out);
out.writeObject(mtx);
}
/** {@inheritDoc} */
@Override public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
super.readExternal(in);
mtx = (Matrix)in.readObject();
}
/** */
private PivotedMatrixStorage storage() {
return (PivotedMatrixStorage)getStorage();
}
/** {@inheritDoc} */
@Override public Matrix copy() {
return new PivotedMatrixView(mtx, storage().rowPivot(), storage().columnPivot());
}
/** {@inheritDoc} */
@Override public Matrix like(int rows, int cols) {
throw new UnsupportedOperationException();
}
/** {@inheritDoc} */
@Override public Vector likeVector(int crd) {
throw new UnsupportedOperationException();
}
/** {@inheritDoc} */
@Override public int hashCode() {
int res = 1;
res = res * 37 + mtx.hashCode();
res = res * 37 + getStorage().hashCode();
return res;
}
/** {@inheritDoc} */
@Override public boolean equals(Object o) {
if (this == o)
return true;
if (o == null || getClass() != o.getClass())
return false;
PivotedMatrixView that = (PivotedMatrixView)o;
MatrixStorage sto = storage();
return mtx.equals(that.mtx) && sto.equals(that.storage());
}
}