/*
* 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 com.facebook.presto.jdbc.internal.airlift.slice.Slices;
import java.util.Arrays;
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 FixedWidthBlockBuilder
extends AbstractFixedWidthBlock
implements BlockBuilder
{
private final BlockBuilderStatus blockBuilderStatus;
private final SliceOutput sliceOutput;
private boolean[] valueIsNull;
private int positionCount;
private int currentEntrySize;
public FixedWidthBlockBuilder(int fixedSize, BlockBuilderStatus blockBuilderStatus)
{
super(fixedSize);
this.blockBuilderStatus = blockBuilderStatus;
this.sliceOutput = new DynamicSliceOutput(blockBuilderStatus.getMaxBlockSizeInBytes());
this.valueIsNull = new boolean[1024];
}
public FixedWidthBlockBuilder(int fixedSize, int positionCount)
{
super(fixedSize);
Slice slice = Slices.allocate(fixedSize * positionCount);
this.blockBuilderStatus = new BlockBuilderStatus(slice.length(), slice.length());
this.sliceOutput = slice.getOutput();
this.valueIsNull = new boolean[positionCount];
}
@Override
protected Slice getRawSlice()
{
return sliceOutput.getUnderlyingSlice();
}
@Override
public int getPositionCount()
{
return positionCount;
}
@Override
public boolean isEmpty()
{
return positionCount == 0;
}
@Override
public boolean isFull()
{
return blockBuilderStatus.isFull();
}
@Override
public int getSizeInBytes()
{
long size = getRawSlice().length() + 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()
{
if (currentEntrySize != fixedSize) {
throw new IllegalStateException("Expected entry size to be exactly " + fixedSize + " but was " + currentEntrySize);
}
entryAdded(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");
}
// fixed width is always written regardless of null flag
sliceOutput.writeZero(fixedSize);
entryAdded(true);
return this;
}
private void entryAdded(boolean isNull)
{
if (positionCount == valueIsNull.length - 1) {
valueIsNull = Arrays.copyOf(valueIsNull, valueIsNull.length * 2);
}
valueIsNull[positionCount] = isNull;
positionCount++;
blockBuilderStatus.addBytes(fixedSize);
if (sliceOutput.size() >= 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");
}
Slice newSlice = sliceOutput.slice().slice(positionOffset * fixedSize, length * fixedSize);
boolean[] newValueIsNull = Arrays.copyOfRange(valueIsNull, positionOffset, positionOffset + length);
return new FixedWidthBlock(fixedSize, length, newSlice, newValueIsNull);
}
@Override
public Block build()
{
if (currentEntrySize > 0) {
throw new IllegalStateException("Current entry must be closed before the block can be built");
}
return new FixedWidthBlock(fixedSize, positionCount, sliceOutput.slice(), valueIsNull);
}
@Override
public String toString()
{
StringBuilder sb = new StringBuilder("FixedWidthBlockBuilder{");
sb.append("positionCount=").append(positionCount);
sb.append(", fixedSize=").append(fixedSize);
sb.append(", size=").append(sliceOutput.size());
sb.append('}');
return sb.toString();
}
}