/*
* 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.vector;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import org.apache.ignite.ml.math.VectorStorage;
import org.apache.ignite.ml.math.exceptions.UnsupportedOperationException;
/**
* Constant read-only vector storage.
*/
public class ConstantVectorStorage implements VectorStorage {
/** */
private int size;
/** */
private double val;
/**
*
*/
public ConstantVectorStorage() {
// No-op.
}
/**
* @param size Vector size.
* @param val Value to set for vector elements.
*/
public ConstantVectorStorage(int size, double val) {
assert size > 0;
this.size = size;
this.val = val;
}
/**
* @return Constant stored in Vector elements.
*/
public double constant() {
return val;
}
/** {@inheritDoc} */
@Override public int size() {
return size;
}
/** {@inheritDoc} */
@Override public double get(int i) {
return val;
}
/** {@inheritDoc} */
@Override public void set(int i, double v) {
throw new UnsupportedOperationException("Can't set value into constant vector.");
}
/** {@inheritDoc} */
@Override public void writeExternal(ObjectOutput out) throws IOException {
out.writeInt(size);
out.writeDouble(val);
}
/** {@inheritDoc} */
@Override public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
size = in.readInt();
val = in.readDouble();
}
/** {@inheritDoc} */
@Override public boolean isSequentialAccess() {
return true;
}
/** {@inheritDoc} */
@Override public boolean isDense() {
return true;
}
/** {@inheritDoc} */
@Override public boolean isRandomAccess() {
return true;
}
/** {@inheritDoc} */
@Override public boolean isDistributed() {
return false;
}
/** {@inheritDoc} */
@Override public boolean isArrayBased() {
return false;
}
/** {@inheritDoc} */
@Override public int hashCode() {
int res = 1;
res = res * 37 + size;
res = res * 37 + Double.hashCode(val);
return res;
}
/** {@inheritDoc} */
@Override public boolean equals(Object o) {
if (this == o)
return true;
if (o == null || getClass() != o.getClass())
return false;
ConstantVectorStorage that = (ConstantVectorStorage)o;
return size == that.size && val == that.val;
}
}