/*
* 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;
import org.apache.ignite.ml.math.Vector;
import org.apache.ignite.ml.math.exceptions.UnsupportedOperationException;
/**
* {@link MatrixStorage} implementation for diagonal Matrix view.
*/
public class DiagonalMatrixStorage implements MatrixStorage {
/** Backing vector for matrix diagonal. */
private Vector diagonal;
/**
*
*/
public DiagonalMatrixStorage() {
// No-op.
}
/**
* @param diagonal Backing {@link Vector} for matrix diagonal.
*/
public DiagonalMatrixStorage(Vector diagonal) {
assert diagonal != null;
this.diagonal = diagonal;
}
/**
*
*/
public Vector diagonal() {
return diagonal;
}
/** {@inheritDoc} */
@Override public double get(int x, int y) {
return x == y ? diagonal.get(x) : 0.0;
}
/** {@inheritDoc} */
@Override public void set(int x, int y, double v) {
if (x == y)
diagonal.set(x, v);
else
throw new UnsupportedOperationException("Can't set off-diagonal element.");
}
/** {@inheritDoc} */
@Override public int columnSize() {
return diagonal.size();
}
/** {@inheritDoc} */
@Override public int rowSize() {
return diagonal.size();
}
/** {@inheritDoc} */
@Override public void writeExternal(ObjectOutput out) throws IOException {
out.writeObject(diagonal);
}
/** {@inheritDoc} */
@Override public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
diagonal = (Vector)in.readObject();
}
/** {@inheritDoc} */
@Override public boolean isSequentialAccess() {
return diagonal.isSequentialAccess();
}
/** {@inheritDoc} */
@Override public boolean isDense() {
return diagonal.isDense();
}
/** {@inheritDoc} */
@Override public boolean isRandomAccess() {
return diagonal.isRandomAccess();
}
/** {@inheritDoc} */
@Override public boolean isDistributed() {
return diagonal.isDistributed();
}
/** {@inheritDoc} */
@Override public boolean isArrayBased() {
return false;
}
/** {@inheritDoc} */
@Override public int hashCode() {
int res = 1;
res = res * 37 + diagonal.hashCode();
return res;
}
/** {@inheritDoc} */
@Override public boolean equals(Object o) {
if (this == o)
return true;
if (o == null || getClass() != o.getClass())
return false;
DiagonalMatrixStorage that = (DiagonalMatrixStorage)o;
return diagonal.equals(that.diagonal);
}
}