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Core sketch algorithms used alone and by other Java repositories in the DataSketches library.
/*
* 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.datasketches.common;
import static org.apache.datasketches.common.ByteArrayUtil.putLongLE;
import java.util.Objects;
import org.apache.datasketches.memory.Memory;
import org.apache.datasketches.memory.WritableMemory;
/**
* Methods of serializing and deserializing arrays of Long.
*
* @author Alexander Saydakov
*/
public class ArrayOfLongsSerDe extends ArrayOfItemsSerDe {
@Override
public byte[] serializeToByteArray(final Long item) {
Objects.requireNonNull(item, "Item must not be null");
final byte[] byteArr = new byte[Long.BYTES];
putLongLE(byteArr, 0, item.longValue());
return byteArr;
}
@Override
public byte[] serializeToByteArray(final Long[] items) {
Objects.requireNonNull(items, "Items must not be null");
if (items.length == 0) { return new byte[0]; }
final byte[] bytes = new byte[Long.BYTES * items.length];
final WritableMemory mem = WritableMemory.writableWrap(bytes);
long offset = 0;
for (int i = 0; i < items.length; i++) {
mem.putLong(offset, items[i]);
offset += Long.BYTES;
}
return bytes;
}
@Override
@Deprecated
public Long[] deserializeFromMemory(final Memory mem, final int numItems) {
return deserializeFromMemory(mem, 0, numItems);
}
@Override
public Long[] deserializeFromMemory(final Memory mem, final long offsetBytes, final int numItems) {
Objects.requireNonNull(mem, "Memory must not be null");
if (numItems <= 0) { return new Long[0]; }
long offset = offsetBytes;
Util.checkBounds(offset, Long.BYTES * (long)numItems, mem.getCapacity());
final Long[] array = new Long[numItems];
for (int i = 0; i < numItems; i++) {
array[i] = mem.getLong(offset);
offset += Long.BYTES;
}
return array;
}
@Override
public int sizeOf(final Long item) {
Objects.requireNonNull(item, "Item must not be null");
return Long.BYTES;
}
@Override //override because this is simpler
public int sizeOf(final Long[] items) {
Objects.requireNonNull(items, "Items must not be null");
return items.length * Long.BYTES;
}
@Override
public int sizeOf(final Memory mem, final long offsetBytes, final int numItems) {
Objects.requireNonNull(mem, "Memory must not be null");
return numItems * Long.BYTES;
}
@Override
public String toString(final Long item) {
if (item == null) { return "null"; }
return item.toString();
}
@Override
public Class getClassOfT() { return Long.class; }
}
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