/*
* 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 org.openjdk.jol.info.ClassLayout;
public class SingleMapBlockWriter
extends AbstractSingleMapBlock
implements BlockBuilder
{
private static final int INSTANCE_SIZE = ClassLayout.parseClass(SingleMapBlockWriter.class).instanceSize();
private final BlockBuilder keyBlockBuilder;
private final BlockBuilder valueBlockBuilder;
private final int initialBlockBuilderSize;
private int positionsWritten;
private boolean writeToValueNext;
SingleMapBlockWriter(int start, BlockBuilder keyBlockBuilder, BlockBuilder valueBlockBuilder)
{
super(start, keyBlockBuilder, valueBlockBuilder);
this.keyBlockBuilder = keyBlockBuilder;
this.valueBlockBuilder = valueBlockBuilder;
this.initialBlockBuilderSize = keyBlockBuilder.getSizeInBytes() + valueBlockBuilder.getSizeInBytes();
}
@Override
public int getSizeInBytes()
{
return keyBlockBuilder.getSizeInBytes() + valueBlockBuilder.getSizeInBytes() - initialBlockBuilderSize;
}
@Override
public int getRetainedSizeInBytes()
{
return INSTANCE_SIZE + keyBlockBuilder.getRetainedSizeInBytes() + valueBlockBuilder.getRetainedSizeInBytes();
}
@Override
public BlockBuilder writeByte(int value)
{
if (writeToValueNext) {
valueBlockBuilder.writeByte(value);
}
else {
keyBlockBuilder.writeByte(value);
}
return this;
}
@Override
public BlockBuilder writeShort(int value)
{
if (writeToValueNext) {
valueBlockBuilder.writeShort(value);
}
else {
keyBlockBuilder.writeShort(value);
}
return this;
}
@Override
public BlockBuilder writeInt(int value)
{
if (writeToValueNext) {
valueBlockBuilder.writeInt(value);
}
else {
keyBlockBuilder.writeInt(value);
}
return this;
}
@Override
public BlockBuilder writeLong(long value)
{
if (writeToValueNext) {
valueBlockBuilder.writeLong(value);
}
else {
keyBlockBuilder.writeLong(value);
}
return this;
}
@Override
public BlockBuilder writeBytes(Slice source, int sourceIndex, int length)
{
if (writeToValueNext) {
valueBlockBuilder.writeBytes(source, sourceIndex, length);
}
else {
keyBlockBuilder.writeBytes(source, sourceIndex, length);
}
return this;
}
@Override
public BlockBuilder writeObject(Object value)
{
if (writeToValueNext) {
valueBlockBuilder.writeObject(value);
}
else {
keyBlockBuilder.writeObject(value);
}
return this;
}
@Override
public BlockBuilder beginBlockEntry()
{
BlockBuilder result;
if (writeToValueNext) {
result = valueBlockBuilder.beginBlockEntry();
}
else {
result = keyBlockBuilder.beginBlockEntry();
}
return result;
}
@Override
public BlockBuilder appendNull()
{
if (writeToValueNext) {
valueBlockBuilder.appendNull();
}
else {
keyBlockBuilder.appendNull();
}
entryAdded();
return this;
}
@Override
public BlockBuilder closeEntry()
{
if (writeToValueNext) {
valueBlockBuilder.closeEntry();
}
else {
keyBlockBuilder.closeEntry();
}
entryAdded();
return this;
}
private void entryAdded()
{
writeToValueNext = !writeToValueNext;
positionsWritten++;
}
@Override
public int getPositionCount()
{
return positionsWritten;
}
@Override
public BlockEncoding getEncoding()
{
throw new UnsupportedOperationException();
}
@Override
public Block build()
{
throw new UnsupportedOperationException();
}
@Override
public BlockBuilder newBlockBuilderLike(BlockBuilderStatus blockBuilderStatus)
{
throw new UnsupportedOperationException();
}
@Override
public String toString()
{
StringBuilder sb = new StringBuilder("SingleMapBlockWriter{");
sb.append("positionCount=").append(getPositionCount());
sb.append('}');
return sb.toString();
}
}