/*
* 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 it.unimi.dsi.fastutil.ints.Int2DoubleOpenHashMap;
import it.unimi.dsi.fastutil.ints.Int2DoubleRBTreeMap;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.Map;
import org.apache.ignite.ml.math.StorageConstants;
import org.apache.ignite.ml.math.VectorStorage;
/**
* Sparse, local, on-heap vector storage.
*/
public class SparseLocalOnHeapVectorStorage implements VectorStorage, StorageConstants {
/** */
private int size;
/** */
private int acsMode;
/** Actual map storage. */
private Map<Integer, Double> sto;
/**
*
*/
public SparseLocalOnHeapVectorStorage() {
// No-op.
}
/**
* @param size Vector size.
* @param acsMode Access mode.
*/
public SparseLocalOnHeapVectorStorage(int size, int acsMode) {
assert size > 0;
assertAccessMode(acsMode);
this.size = size;
this.acsMode = acsMode;
if (acsMode == SEQUENTIAL_ACCESS_MODE)
sto = new Int2DoubleRBTreeMap();
else
sto = new Int2DoubleOpenHashMap();
}
/**
* @return Vector elements access mode.
*/
public int getAccessMode() {
return acsMode;
}
/** {@inheritDoc} */
@Override public int size() {
return size;
}
/** {@inheritDoc} */
@Override public double get(int i) {
return sto.getOrDefault(i, 0.0);
}
/** {@inheritDoc} */
@Override public void set(int i, double v) {
if (v != 0.0)
sto.put(i, v);
else if (sto.containsKey(i))
sto.remove(i);
}
/** {@inheritDoc} */
@Override public void writeExternal(ObjectOutput out) throws IOException {
out.writeInt(size);
out.writeInt(acsMode);
out.writeObject(sto);
}
/** {@inheritDoc} */
@SuppressWarnings({"unchecked"})
@Override public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
size = in.readInt();
acsMode = in.readInt();
sto = (Map<Integer, Double>)in.readObject();
}
/** {@inheritDoc} */
@Override public boolean isSequentialAccess() {
return acsMode == SEQUENTIAL_ACCESS_MODE;
}
/** {@inheritDoc} */
@Override public boolean isDense() {
return false;
}
/** {@inheritDoc} */
@Override public boolean isRandomAccess() {
return true;
}
/** {@inheritDoc} */
@Override public boolean isDistributed() {
return false;
}
/** {@inheritDoc} */
@Override public boolean isArrayBased() {
return false;
}
/** {@inheritDoc} */
@Override public boolean equals(Object o) {
if (this == o)
return true;
if (o == null || getClass() != o.getClass())
return false;
SparseLocalOnHeapVectorStorage that = (SparseLocalOnHeapVectorStorage)o;
return size == that.size && acsMode == that.acsMode && (sto != null ? sto.equals(that.sto) : that.sto == null);
}
/** {@inheritDoc} */
@Override public int hashCode() {
int res = size;
res = 31 * res + acsMode;
res = 31 * res + (sto != null ? sto.hashCode() : 0);
return res;
}
}