/*
* 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.type.block;
import com.facebook.presto.jdbc.internal.airlift.slice.DynamicSliceOutput;
import com.facebook.presto.jdbc.internal.airlift.slice.SizeOf;
import com.facebook.presto.jdbc.internal.airlift.slice.Slice;
import com.facebook.presto.jdbc.internal.airlift.slice.SliceOutput;
import java.util.Arrays;
import java.util.Objects;
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 final BlockBuilderStatus blockBuilderStatus;
private final SliceOutput sliceOutput;
private int positions;
private int[] offsets = new int[1024];
private boolean[] valueIsNull = new boolean[1024];
private int currentEntrySize;
public VariableWidthBlockBuilder(BlockBuilderStatus blockBuilderStatus)
{
this.blockBuilderStatus = Objects.requireNonNull(blockBuilderStatus, "blockBuilderStatus is null");
this.sliceOutput = new DynamicSliceOutput((int) (blockBuilderStatus.getMaxBlockSizeInBytes() * 1.2));
}
@Override
protected int getPositionOffset(int position)
{
if (position >= positions) {
throw new IllegalArgumentException("position " + position + " must be less than position count " + positions);
}
return offsets[position];
}
@Override
public int getLength(int position)
{
if (position >= positions) {
throw new IllegalArgumentException("position " + position + " must be less than position count " + positions);
}
return offsets[position + 1] - offsets[position];
}
@Override
protected Slice getRawSlice(int position)
{
return sliceOutput.getUnderlyingSlice();
}
@Override
public int getPositionCount()
{
return positions;
}
@Override
public boolean isEmpty()
{
return positions == 0;
}
@Override
public boolean isFull()
{
return blockBuilderStatus.isFull();
}
@Override
public int getSizeInBytes()
{
long size = sliceOutput.getUnderlyingSlice().length() + SizeOf.sizeOf(offsets) + SizeOf.sizeOf(valueIsNull);
if (size > Integer.MAX_VALUE) {
return Integer.MAX_VALUE;
}
return (int) size;
}
@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)
{
if (positions + 1 >= offsets.length) {
offsets = Arrays.copyOf(offsets, offsets.length * 2);
valueIsNull = Arrays.copyOf(valueIsNull, valueIsNull.length * 2);
}
valueIsNull[positions] = isNull;
positions++;
offsets[positions] = sliceOutput.size();
blockBuilderStatus.addBytes(SIZE_OF_BYTE + SIZE_OF_INT + bytesWritten);
if (sliceOutput.size() + ((SIZE_OF_BYTE + SIZE_OF_INT) * positions) >= blockBuilderStatus.getMaxBlockSizeInBytes()) {
blockBuilderStatus.setFull();
}
}
@Override
protected boolean isEntryNull(int position)
{
return valueIsNull[position];
}
@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");
}
int[] newOffsets = Arrays.copyOfRange(offsets, positionOffset, positionOffset + length + 1);
boolean[] newValueIsNull = Arrays.copyOfRange(valueIsNull, positionOffset, 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(), Arrays.copyOf(offsets, positions + 1), Arrays.copyOf(valueIsNull, positions));
}
@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();
}
}