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com.facebook.presto.jdbc.internal.spi.block.VariableWidthBlockBuilder Maven / Gradle / Ivy
/*
* 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.jdbc.internal.spi.block;
import com.facebook.presto.jdbc.internal.airlift.slice.DynamicSliceOutput;
import com.facebook.presto.jdbc.internal.airlift.slice.Slice;
import com.facebook.presto.jdbc.internal.airlift.slice.SliceOutput;
import com.facebook.presto.jdbc.internal.airlift.slice.Slices;
import com.facebook.presto.jdbc.internal.jol.info.ClassLayout;
import java.util.List;
import java.util.Objects;
import static com.facebook.presto.jdbc.internal.spi.block.BlockValidationUtil.checkValidPositions;
import static com.facebook.presto.jdbc.internal.airlift.slice.SizeOf.SIZE_OF_BYTE;
import static com.facebook.presto.jdbc.internal.airlift.slice.SizeOf.SIZE_OF_DOUBLE;
import static com.facebook.presto.jdbc.internal.airlift.slice.SizeOf.SIZE_OF_FLOAT;
import static com.facebook.presto.jdbc.internal.airlift.slice.SizeOf.SIZE_OF_INT;
import static com.facebook.presto.jdbc.internal.airlift.slice.SizeOf.SIZE_OF_LONG;
import static com.facebook.presto.jdbc.internal.airlift.slice.SizeOf.SIZE_OF_SHORT;
public class VariableWidthBlockBuilder
extends AbstractVariableWidthBlock
implements BlockBuilder
{
private static final int INSTANCE_SIZE = ClassLayout.parseClass(VariableWidthBlockBuilder.class).instanceSize() + BlockBuilderStatus.INSTANCE_SIZE;
private final BlockBuilderStatus blockBuilderStatus;
private final SliceOutput sliceOutput;
private final SliceOutput valueIsNull;
private final SliceOutput offsets;
private int positions;
private int currentEntrySize;
public VariableWidthBlockBuilder(BlockBuilderStatus blockBuilderStatus, int expectedEntries, int expectedBytesPerEntry)
{
this.blockBuilderStatus = Objects.requireNonNull(blockBuilderStatus, "blockBuilderStatus is null");
this.sliceOutput = new DynamicSliceOutput(expectedBytesPerEntry * expectedEntries);
this.valueIsNull = new DynamicSliceOutput(expectedEntries);
this.offsets = new DynamicSliceOutput(SIZE_OF_INT * expectedEntries);
offsets.appendInt(0);
}
@Override
protected int getPositionOffset(int position)
{
if (position >= positions) {
throw new IllegalArgumentException("position " + position + " must be less than position count " + positions);
}
return getOffset(position);
}
@Override
public int getLength(int position)
{
if (position >= positions) {
throw new IllegalArgumentException("position " + position + " must be less than position count " + positions);
}
return getOffset((position + 1)) - getOffset(position);
}
@Override
protected Slice getRawSlice(int position)
{
return sliceOutput.getUnderlyingSlice();
}
@Override
public int getPositionCount()
{
return positions;
}
@Override
public int getSizeInBytes()
{
long size = sliceOutput.size() + offsets.size() + valueIsNull.size();
if (size > Integer.MAX_VALUE) {
return Integer.MAX_VALUE;
}
return (int) size;
}
@Override
public int getRetainedSizeInBytes()
{
long size = INSTANCE_SIZE + sliceOutput.getRetainedSize() + offsets.getRetainedSize() + valueIsNull.getRetainedSize();
if (size > Integer.MAX_VALUE) {
return Integer.MAX_VALUE;
}
return (int) size;
}
@Override
public Block copyPositions(List positions)
{
checkValidPositions(positions, this.positions);
int finalLength = positions.stream().mapToInt(this::getLength).sum();
SliceOutput newSlice = Slices.allocate(finalLength).getOutput();
SliceOutput newOffsets = Slices.allocate((positions.size() * SIZE_OF_INT) + SIZE_OF_INT).getOutput();
SliceOutput newValueIsNull = Slices.allocate(positions.size()).getOutput();
newOffsets.appendInt(0);
for (int position : positions) {
boolean isNull = isEntryNull(position);
newValueIsNull.appendByte(isNull ? 1 : 0);
if (!isNull) {
newSlice.appendBytes(sliceOutput.getUnderlyingSlice().getBytes(getPositionOffset(position), getLength(position)));
}
newOffsets.appendInt(newSlice.size());
}
return new VariableWidthBlock(positions.size(), newSlice.slice(), newOffsets.slice(), newValueIsNull.slice());
}
@Override
public BlockBuilder writeByte(int value)
{
sliceOutput.writeByte(value);
currentEntrySize += SIZE_OF_BYTE;
return this;
}
@Override
public BlockBuilder writeShort(int value)
{
sliceOutput.writeShort(value);
currentEntrySize += SIZE_OF_SHORT;
return this;
}
@Override
public BlockBuilder writeInt(int value)
{
sliceOutput.writeInt(value);
currentEntrySize += SIZE_OF_INT;
return this;
}
@Override
public BlockBuilder writeLong(long value)
{
sliceOutput.writeLong(value);
currentEntrySize += SIZE_OF_LONG;
return this;
}
@Override
public BlockBuilder writeFloat(float value)
{
sliceOutput.writeFloat(value);
currentEntrySize += SIZE_OF_FLOAT;
return this;
}
@Override
public BlockBuilder writeDouble(double value)
{
sliceOutput.writeDouble(value);
currentEntrySize += SIZE_OF_DOUBLE;
return this;
}
@Override
public BlockBuilder writeBytes(Slice source, int sourceIndex, int length)
{
sliceOutput.writeBytes(source, sourceIndex, length);
currentEntrySize += length;
return this;
}
@Override
public BlockBuilder closeEntry()
{
entryAdded(currentEntrySize, false);
currentEntrySize = 0;
return this;
}
@Override
public BlockBuilder appendNull()
{
if (currentEntrySize > 0) {
throw new IllegalStateException("Current entry must be closed before a null can be written");
}
entryAdded(0, true);
return this;
}
private void entryAdded(int bytesWritten, boolean isNull)
{
positions++;
valueIsNull.appendByte(isNull ? 1 : 0);
offsets.appendInt(sliceOutput.size());
blockBuilderStatus.addBytes(SIZE_OF_BYTE + SIZE_OF_INT + bytesWritten);
}
@Override
protected boolean isEntryNull(int position)
{
return valueIsNull.getUnderlyingSlice().getByte(position) != 0;
}
@Override
public Block getRegion(int positionOffset, int length)
{
int positionCount = getPositionCount();
if (positionOffset < 0 || length < 0 || positionOffset + length > positionCount) {
throw new IndexOutOfBoundsException("Invalid position " + positionOffset + " in block with " + positionCount + " positions");
}
Slice newOffsets = offsets.getUnderlyingSlice().slice(positionOffset * SIZE_OF_INT, (length + 1) * SIZE_OF_INT);
Slice newValueIsNull = valueIsNull.getUnderlyingSlice().slice(positionOffset, length);
return new VariableWidthBlock(length, sliceOutput.slice(), newOffsets, newValueIsNull);
}
@Override
public Block copyRegion(int positionOffset, int length)
{
int positionCount = getPositionCount();
if (positionOffset < 0 || length < 0 || positionOffset + length > positionCount) {
throw new IndexOutOfBoundsException("Invalid position " + positionOffset + " in block with " + positionCount + " positions");
}
Slice newOffsets = Slices.copyOf(offsets.getUnderlyingSlice(), positionOffset * SIZE_OF_INT, (length + 1) * SIZE_OF_INT);
Slice newValueIsNull = Slices.copyOf(valueIsNull.getUnderlyingSlice(), positionOffset, length);
return new VariableWidthBlock(length, sliceOutput.slice(), newOffsets, newValueIsNull);
}
@Override
public Block build()
{
if (currentEntrySize > 0) {
throw new IllegalStateException("Current entry must be closed before the block can be built");
}
return new VariableWidthBlock(positions, sliceOutput.slice(), offsets.slice(), valueIsNull.slice());
}
private int getOffset(int position)
{
return offsets.getUnderlyingSlice().getInt(position * SIZE_OF_INT);
}
@Override
public String toString()
{
StringBuilder sb = new StringBuilder("VariableWidthBlockBuilder{");
sb.append("positionCount=").append(positions);
sb.append(", size=").append(sliceOutput.size());
sb.append('}');
return sb.toString();
}
}
