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/*
* Licensed 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 com.facebook.presto.spi.block;
import io.airlift.slice.Slice;
import io.airlift.slice.Slices;
import java.util.Arrays;
import static java.lang.Math.ceil;
import static java.lang.String.format;
import static java.util.Objects.requireNonNull;
final class BlockUtil
{
private static final double BLOCK_RESET_SKEW = 1.25;
private static final int DEFAULT_CAPACITY = 64;
// See java.util.ArrayList for an explanation
static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8;
private BlockUtil()
{
}
static void checkArrayRange(int[] array, int offset, int length)
{
requireNonNull(array, "array is null");
if (offset < 0 || length < 0 || offset + length > array.length) {
throw new IndexOutOfBoundsException(format("Invalid offset %s and length %s in array with %s elements", offset, length, array.length));
}
}
static void checkValidRegion(int positionCount, int positionOffset, int length)
{
if (positionOffset < 0 || length < 0 || positionOffset + length > positionCount) {
throw new IndexOutOfBoundsException(format("Invalid position %s and length %s in block with %s positions", positionOffset, length, positionCount));
}
}
static void checkValidPosition(int position, int positionCount)
{
if (position < 0 || position >= positionCount) {
throw new IllegalArgumentException(format("Invalid position %s in block with %s positions", position, positionCount));
}
}
static int calculateNewArraySize(int currentSize)
{
// grow array by 50%
long newSize = (long) currentSize + (currentSize >> 1);
// verify new size is within reasonable bounds
if (newSize < DEFAULT_CAPACITY) {
newSize = DEFAULT_CAPACITY;
}
else if (newSize > MAX_ARRAY_SIZE) {
newSize = MAX_ARRAY_SIZE;
if (newSize == currentSize) {
throw new IllegalArgumentException(format("Can not grow array beyond '%s'", MAX_ARRAY_SIZE));
}
}
return (int) newSize;
}
static int calculateBlockResetSize(int currentSize)
{
long newSize = (long) ceil(currentSize * BLOCK_RESET_SKEW);
// verify new size is within reasonable bounds
if (newSize < DEFAULT_CAPACITY) {
newSize = DEFAULT_CAPACITY;
}
else if (newSize > MAX_ARRAY_SIZE) {
newSize = MAX_ARRAY_SIZE;
}
return (int) newSize;
}
static int calculateBlockResetBytes(int currentBytes)
{
long newBytes = (long) ceil(currentBytes * BLOCK_RESET_SKEW);
if (newBytes > MAX_ARRAY_SIZE) {
return MAX_ARRAY_SIZE;
}
return (int) newBytes;
}
/**
* Recalculate the offsets array for the specified range.
* The returned offsets array contains length + 1 integers
* with the first value set to 0.
* If the range matches the entire offsets array, the input array will be returned.
*/
static int[] compactOffsets(int[] offsets, int index, int length)
{
if (index == 0 && offsets.length == length + 1) {
return offsets;
}
int[] newOffsets = new int[length + 1];
for (int i = 1; i <= length; i++) {
newOffsets[i] = offsets[index + i] - offsets[index];
}
return newOffsets;
}
/**
* Returns a slice containing values in the specified range of the specified slice.
* If the range matches the entire slice, the input slice will be returned.
* Otherwise, a copy will be returned.
*/
static Slice compactSlice(Slice slice, int index, int length)
{
if (slice.isCompact() && index == 0 && length == slice.length()) {
return slice;
}
return Slices.copyOf(slice, index, length);
}
/**
* Returns an array containing elements in the specified range of the specified array.
* If the range matches the entire array, the input array will be returned.
* Otherwise, a copy will be returned.
*/
static boolean[] compactArray(boolean[] array, int index, int length)
{
if (index == 0 && length == array.length) {
return array;
}
return Arrays.copyOfRange(array, index, index + length);
}
static byte[] compactArray(byte[] array, int index, int length)
{
if (index == 0 && length == array.length) {
return array;
}
return Arrays.copyOfRange(array, index, index + length);
}
static short[] compactArray(short[] array, int index, int length)
{
if (index == 0 && length == array.length) {
return array;
}
return Arrays.copyOfRange(array, index, index + length);
}
static int[] compactArray(int[] array, int index, int length)
{
if (index == 0 && length == array.length) {
return array;
}
return Arrays.copyOfRange(array, index, index + length);
}
static long[] compactArray(long[] array, int index, int length)
{
if (index == 0 && length == array.length) {
return array;
}
return Arrays.copyOfRange(array, index, index + length);
}
/**
* Returns true if the two specified arrays contain the same object in every position.
* Unlike the {@link Arrays#equals(Object[], Object[])} method, this method compares using reference equals.
*/
static boolean arraySame(Object[] array1, Object[] array2)
{
if (array1 == null || array2 == null || array1.length != array2.length) {
throw new IllegalArgumentException("array1 and array2 cannot be null and should have same length");
}
for (int i = 0; i < array1.length; i++) {
if (array1[i] != array2[i]) {
return false;
}
}
return true;
}
}
