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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 static com.facebook.presto.spi.block.BlockUtil.arraySame;
import static com.facebook.presto.spi.block.BlockUtil.checkArrayRange;
import static com.facebook.presto.spi.block.BlockUtil.checkValidRegion;
import static com.facebook.presto.spi.block.BlockUtil.compactArray;
import static com.facebook.presto.spi.block.BlockUtil.compactOffsets;
import static com.facebook.presto.spi.block.RowBlock.createRowBlockInternal;
public abstract class AbstractRowBlock
implements Block
{
protected final int numFields;
protected abstract Block[] getRawFieldBlocks();
protected abstract int[] getFieldBlockOffsets();
protected abstract int getOffsetBase();
protected abstract boolean[] getRowIsNull();
// the offset in each field block, it can also be viewed as the "entry-based" offset in the RowBlock
protected int getFieldBlockOffset(int position)
{
return getFieldBlockOffsets()[position + getOffsetBase()];
}
protected AbstractRowBlock(int numFields)
{
if (numFields <= 0) {
throw new IllegalArgumentException("Number of fields in RowBlock must be positive");
}
this.numFields = numFields;
}
@Override
public String getEncodingName()
{
return RowBlockEncoding.NAME;
}
@Override
public Block copyPositions(int[] positions, int offset, int length)
{
checkArrayRange(positions, offset, length);
int[] newOffsets = new int[length + 1];
boolean[] newRowIsNull = new boolean[length];
IntArrayList fieldBlockPositions = new IntArrayList(length);
for (int i = 0; i < length; i++) {
int position = positions[offset + i];
if (isNull(position)) {
newRowIsNull[i] = true;
newOffsets[i + 1] = newOffsets[i];
}
else {
newOffsets[i + 1] = newOffsets[i] + 1;
fieldBlockPositions.add(getFieldBlockOffset(position));
}
}
Block[] newBlocks = new Block[numFields];
for (int i = 0; i < numFields; i++) {
newBlocks[i] = getRawFieldBlocks()[i].copyPositions(fieldBlockPositions.elements(), 0, fieldBlockPositions.size());
}
return createRowBlockInternal(0, length, newRowIsNull, newOffsets, newBlocks);
}
@Override
public Block getRegion(int position, int length)
{
int positionCount = getPositionCount();
checkValidRegion(positionCount, position, length);
return createRowBlockInternal(position + getOffsetBase(), length, getRowIsNull(), getFieldBlockOffsets(), getRawFieldBlocks());
}
@Override
public long getRegionSizeInBytes(int position, int length)
{
int positionCount = getPositionCount();
checkValidRegion(positionCount, position, length);
int startFieldBlockOffset = getFieldBlockOffset(position);
int endFieldBlockOffset = getFieldBlockOffset(position + length);
int fieldBlockLength = endFieldBlockOffset - startFieldBlockOffset;
long regionSizeInBytes = (Integer.BYTES + Byte.BYTES) * (long) length;
for (int i = 0; i < numFields; i++) {
regionSizeInBytes += getRawFieldBlocks()[i].getRegionSizeInBytes(startFieldBlockOffset, fieldBlockLength);
}
return regionSizeInBytes;
}
@Override
public Block copyRegion(int position, int length)
{
int positionCount = getPositionCount();
checkValidRegion(positionCount, position, length);
int startFieldBlockOffset = getFieldBlockOffset(position);
int endFieldBlockOffset = getFieldBlockOffset(position + length);
int fieldBlockLength = endFieldBlockOffset - startFieldBlockOffset;
Block[] newBlocks = new Block[numFields];
for (int i = 0; i < numFields; i++) {
newBlocks[i] = getRawFieldBlocks()[i].copyRegion(startFieldBlockOffset, fieldBlockLength);
}
int[] newOffsets = compactOffsets(getFieldBlockOffsets(), position + getOffsetBase(), length);
boolean[] rowIsNull = getRowIsNull();
boolean[] newRowIsNull = rowIsNull == null ? null : compactArray(rowIsNull, position + getOffsetBase(), length);
if (arraySame(newBlocks, getRawFieldBlocks()) && newOffsets == getFieldBlockOffsets() && newRowIsNull == rowIsNull) {
return this;
}
return createRowBlockInternal(0, length, newRowIsNull, newOffsets, newBlocks);
}
@Override
public T getObject(int position, Class clazz)
{
if (clazz != Block.class) {
throw new IllegalArgumentException("clazz must be Block.class");
}
checkReadablePosition(position);
return clazz.cast(new SingleRowBlock(getFieldBlockOffset(position), getRawFieldBlocks()));
}
@Override
public void writePositionTo(int position, BlockBuilder blockBuilder)
{
checkReadablePosition(position);
blockBuilder.appendStructureInternal(this, position);
}
@Override
public Block getSingleValueBlock(int position)
{
checkReadablePosition(position);
int startFieldBlockOffset = getFieldBlockOffset(position);
int endFieldBlockOffset = getFieldBlockOffset(position + 1);
int fieldBlockLength = endFieldBlockOffset - startFieldBlockOffset;
Block[] newBlocks = new Block[numFields];
for (int i = 0; i < numFields; i++) {
newBlocks[i] = getRawFieldBlocks()[i].copyRegion(startFieldBlockOffset, fieldBlockLength);
}
boolean[] newRowIsNull = new boolean[] {isNull(position)};
int[] newOffsets = new int[] {0, fieldBlockLength};
return createRowBlockInternal(0, 1, newRowIsNull, newOffsets, newBlocks);
}
@Override
public long getEstimatedDataSizeForStats(int position)
{
checkReadablePosition(position);
if (isNull(position)) {
return 0;
}
Block[] rawFieldBlocks = getRawFieldBlocks();
long size = 0;
for (int i = 0; i < numFields; i++) {
size += rawFieldBlocks[i].getEstimatedDataSizeForStats(getFieldBlockOffset(position));
}
return size;
}
@Override
public boolean isNull(int position)
{
checkReadablePosition(position);
boolean[] rowIsNull = getRowIsNull();
return rowIsNull != null && rowIsNull[position + getOffsetBase()];
}
private void checkReadablePosition(int position)
{
if (position < 0 || position >= getPositionCount()) {
throw new IllegalArgumentException("position is not valid");
}
}
}
