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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.jdbc.internal.spi.block;
import java.util.ArrayList;
import java.util.List;
import static com.facebook.presto.jdbc.internal.spi.block.BlockUtil.arraySame;
import static com.facebook.presto.jdbc.internal.spi.block.BlockUtil.compactArray;
import static com.facebook.presto.jdbc.internal.spi.block.BlockUtil.compactOffsets;
import static java.lang.String.format;
public abstract class AbstractRowBlock
implements Block
{
protected final int numFields;
protected abstract Block[] getFieldBlocks();
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 RowBlockEncoding getEncoding()
{
BlockEncoding[] fieldBlockEncodings = new BlockEncoding[numFields];
for (int i = 0; i < numFields; i++) {
fieldBlockEncodings[i] = getFieldBlocks()[i].getEncoding();
}
return new RowBlockEncoding(fieldBlockEncodings);
}
@Override
public Block copyPositions(List positions)
{
int newPositionCount = positions.size();
int[] newOffsets = new int[newPositionCount + 1];
boolean[] newRowIsNull = new boolean[newPositionCount];
List fieldBlockPositions = new ArrayList<>(newPositionCount);
for (int i = 0; i < newPositionCount; i++) {
int position = positions.get(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] = getFieldBlocks()[i].copyPositions(fieldBlockPositions);
}
return new RowBlock(0, positions.size(), newRowIsNull, newOffsets, newBlocks);
}
@Override
public Block getRegion(int position, int length)
{
int positionCount = getPositionCount();
if (position < 0 || length < 0 || position + length > positionCount) {
throw new IndexOutOfBoundsException(format("Invalid position range [%s, %s) in block with %s positions", position, position + length, positionCount));
}
if (position == 0 && length == positionCount) {
return this;
}
return new RowBlock(position + getOffsetBase(), length, getRowIsNull(), getFieldBlockOffsets(), getFieldBlocks());
}
@Override
public long getRegionSizeInBytes(int position, int length)
{
int positionCount = getPositionCount();
if (position < 0 || length < 0 || position + length > positionCount) {
throw new IndexOutOfBoundsException(format("Invalid position range [%s, %s) in block with %s positions", position, position + length, positionCount));
}
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 += getFieldBlocks()[i].getRegionSizeInBytes(startFieldBlockOffset, fieldBlockLength);
}
return regionSizeInBytes;
}
@Override
public Block copyRegion(int position, int length)
{
int positionCount = getPositionCount();
if (position < 0 || length < 0 || position + length > positionCount) {
throw new IndexOutOfBoundsException(format("Invalid position range [%s, %s) in block with %s positions", position, position + length, positionCount));
}
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] = getFieldBlocks()[i].copyRegion(startFieldBlockOffset, fieldBlockLength);
}
int[] newOffsets = compactOffsets(getFieldBlockOffsets(), position + getOffsetBase(), length);
boolean[] newRowIsNull = compactArray(getRowIsNull(), position + getOffsetBase(), length);
if (arraySame(newBlocks, getFieldBlocks()) && newOffsets == getFieldBlockOffsets() && newRowIsNull == getRowIsNull()) {
return this;
}
return new RowBlock(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) * numFields, getFieldBlocks()));
}
@Override
public void writePositionTo(int position, BlockBuilder blockBuilder)
{
checkReadablePosition(position);
BlockBuilder entryBuilder = blockBuilder.beginBlockEntry();
int fieldBlockOffset = getFieldBlockOffset(position);
for (int i = 0; i < numFields; i++) {
if (getFieldBlocks()[i].isNull(fieldBlockOffset)) {
entryBuilder.appendNull();
}
else {
getFieldBlocks()[i].writePositionTo(fieldBlockOffset, entryBuilder);
entryBuilder.closeEntry();
}
}
}
@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] = getFieldBlocks()[i].copyRegion(startFieldBlockOffset, fieldBlockLength);
}
boolean[] newRowIsNull = new boolean[] {isNull(position)};
int[] newOffsets = new int[] {0, fieldBlockLength};
return new RowBlock(0, 1, newRowIsNull, newOffsets, newBlocks);
}
@Override
public boolean isNull(int position)
{
checkReadablePosition(position);
return getRowIsNull()[position + getOffsetBase()];
}
private void checkReadablePosition(int position)
{
if (position < 0 || position >= getPositionCount()) {
throw new IllegalArgumentException("position is not valid");
}
}
}
