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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 com.facebook.presto.spi.type.Type;
import org.openjdk.jol.info.ClassLayout;
import javax.annotation.Nullable;
import java.util.Arrays;
import java.util.function.BiConsumer;
import static com.facebook.presto.spi.block.ArrayBlock.createArrayBlockInternal;
import static com.facebook.presto.spi.block.BlockUtil.calculateBlockResetSize;
import static io.airlift.slice.SizeOf.sizeOf;
import static java.lang.Math.max;
import static java.util.Objects.requireNonNull;
public class ArrayBlockBuilder
extends AbstractArrayBlock
implements BlockBuilder
{
private static final int INSTANCE_SIZE = ClassLayout.parseClass(ArrayBlockBuilder.class).instanceSize();
private int positionCount;
@Nullable
private BlockBuilderStatus blockBuilderStatus;
private boolean initialized;
private int initialEntryCount;
private int[] offsets = new int[1];
private boolean[] valueIsNull = new boolean[0];
private final BlockBuilder values;
private boolean currentEntryOpened;
private long retainedSizeInBytes;
/**
* Caller of this constructor is responsible for making sure `valuesBlock` is constructed with the same `blockBuilderStatus` as the one in the argument
*/
public ArrayBlockBuilder(BlockBuilder valuesBlock, BlockBuilderStatus blockBuilderStatus, int expectedEntries)
{
this(
blockBuilderStatus,
valuesBlock,
expectedEntries);
}
public ArrayBlockBuilder(Type elementType, BlockBuilderStatus blockBuilderStatus, int expectedEntries, int expectedBytesPerEntry)
{
this(
blockBuilderStatus,
elementType.createBlockBuilder(blockBuilderStatus, expectedEntries, expectedBytesPerEntry),
expectedEntries);
}
public ArrayBlockBuilder(Type elementType, BlockBuilderStatus blockBuilderStatus, int expectedEntries)
{
this(
blockBuilderStatus,
elementType.createBlockBuilder(blockBuilderStatus, expectedEntries),
expectedEntries);
}
/**
* Caller of this private constructor is responsible for making sure `values` is constructed with the same `blockBuilderStatus` as the one in the argument
*/
private ArrayBlockBuilder(@Nullable BlockBuilderStatus blockBuilderStatus, BlockBuilder values, int expectedEntries)
{
this.blockBuilderStatus = blockBuilderStatus;
this.values = requireNonNull(values, "values is null");
this.initialEntryCount = max(expectedEntries, 1);
updateDataSize();
}
@Override
public int getPositionCount()
{
return positionCount;
}
@Override
public long getSizeInBytes()
{
return values.getSizeInBytes() + ((Integer.BYTES + Byte.BYTES) * (long) positionCount);
}
@Override
public long getRetainedSizeInBytes()
{
return retainedSizeInBytes + values.getRetainedSizeInBytes();
}
@Override
public void retainedBytesForEachPart(BiConsumer consumer)
{
consumer.accept(values, values.getRetainedSizeInBytes());
consumer.accept(offsets, sizeOf(offsets));
consumer.accept(valueIsNull, sizeOf(valueIsNull));
consumer.accept(this, (long) INSTANCE_SIZE);
}
@Override
protected Block getRawElementBlock()
{
return values;
}
@Override
protected int[] getOffsets()
{
return offsets;
}
@Override
protected int getOffsetBase()
{
return 0;
}
@Override
protected boolean[] getValueIsNull()
{
return valueIsNull;
}
@Override
public BlockBuilder appendStructure(Block block)
{
if (currentEntryOpened) {
throw new IllegalStateException("Expected current entry to be closed but was opened");
}
currentEntryOpened = true;
for (int i = 0; i < block.getPositionCount(); i++) {
if (block.isNull(i)) {
values.appendNull();
}
else {
block.writePositionTo(i, values);
}
}
closeEntry();
return this;
}
@Override
public BlockBuilder appendStructureInternal(Block block, int position)
{
if (!(block instanceof AbstractArrayBlock)) {
throw new IllegalArgumentException();
}
AbstractArrayBlock arrayBlock = (AbstractArrayBlock) block;
BlockBuilder entryBuilder = beginBlockEntry();
int startValueOffset = arrayBlock.getOffset(position);
int endValueOffset = arrayBlock.getOffset(position + 1);
for (int i = startValueOffset; i < endValueOffset; i++) {
if (arrayBlock.getRawElementBlock().isNull(i)) {
entryBuilder.appendNull();
}
else {
arrayBlock.getRawElementBlock().writePositionTo(i, entryBuilder);
}
}
closeEntry();
return this;
}
@Override
public SingleArrayBlockWriter beginBlockEntry()
{
if (currentEntryOpened) {
throw new IllegalStateException("Expected current entry to be closed but was closed");
}
currentEntryOpened = true;
return new SingleArrayBlockWriter(values, values.getPositionCount());
}
@Override
public BlockBuilder closeEntry()
{
if (!currentEntryOpened) {
throw new IllegalStateException("Expected entry to be opened but was closed");
}
entryAdded(false);
currentEntryOpened = false;
return this;
}
@Override
public BlockBuilder appendNull()
{
if (currentEntryOpened) {
throw new IllegalStateException("Current entry must be closed before a null can be written");
}
entryAdded(true);
return this;
}
private void entryAdded(boolean isNull)
{
if (valueIsNull.length <= positionCount) {
growCapacity();
}
offsets[positionCount + 1] = values.getPositionCount();
valueIsNull[positionCount] = isNull;
positionCount++;
if (blockBuilderStatus != null) {
blockBuilderStatus.addBytes(Integer.BYTES + Byte.BYTES);
}
}
private void growCapacity()
{
int newSize;
if (initialized) {
newSize = BlockUtil.calculateNewArraySize(valueIsNull.length);
}
else {
newSize = initialEntryCount;
initialized = true;
}
valueIsNull = Arrays.copyOf(valueIsNull, newSize);
offsets = Arrays.copyOf(offsets, newSize + 1);
updateDataSize();
}
private void updateDataSize()
{
retainedSizeInBytes = INSTANCE_SIZE + sizeOf(valueIsNull) + sizeOf(offsets);
if (blockBuilderStatus != null) {
retainedSizeInBytes += BlockBuilderStatus.INSTANCE_SIZE;
}
}
@Override
public ArrayBlock build()
{
if (currentEntryOpened) {
throw new IllegalStateException("Current entry must be closed before the block can be built");
}
return createArrayBlockInternal(0, positionCount, valueIsNull, offsets, values.build());
}
@Override
public BlockBuilder newBlockBuilderLike(BlockBuilderStatus blockBuilderStatus)
{
int newSize = calculateBlockResetSize(getPositionCount());
return new ArrayBlockBuilder(blockBuilderStatus, values.newBlockBuilderLike(blockBuilderStatus), newSize);
}
@Override
public String toString()
{
StringBuilder sb = new StringBuilder("ArrayBlockBuilder{");
sb.append("positionCount=").append(getPositionCount());
sb.append('}');
return sb.toString();
}
}
