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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.common.block;
import io.airlift.slice.Slice;
import io.airlift.slice.SliceOutput;
import io.airlift.slice.Slices;
import io.airlift.slice.XxHash64;
import static com.facebook.presto.common.block.BlockUtil.checkValidPosition;
import static io.airlift.slice.Slices.EMPTY_SLICE;
public abstract class AbstractVariableWidthBlock
implements Block
{
// TODO: create ColumnarSlice class and expose the rawSlice through it
public abstract Slice getRawSlice(int position);
// TODO: create ColumnarSlice class and expose the offset through it
public abstract int getPositionOffset(int position);
protected abstract boolean isEntryNull(int position);
@Override
public String getEncodingName()
{
return VariableWidthBlockEncoding.NAME;
}
@Override
public byte getByte(int position)
{
checkReadablePosition(position);
return getRawSlice(position).getByte(getPositionOffset(position));
}
@Override
public short getShort(int position)
{
checkReadablePosition(position);
return getRawSlice(position).getShort(getPositionOffset(position));
}
@Override
public int getInt(int position)
{
checkReadablePosition(position);
return getRawSlice(position).getInt(getPositionOffset(position));
}
@Override
public long getLong(int position)
{
checkReadablePosition(position);
return getRawSlice(position).getLong(getPositionOffset(position));
}
@Override
public long getLong(int position, int offset)
{
checkReadablePosition(position);
return getRawSlice(position).getLong(getPositionOffset(position) + offset);
}
@Override
public Slice getSlice(int position, int offset, int length)
{
checkReadablePosition(position);
return getRawSlice(position).slice(getPositionOffset(position) + offset, length);
}
@Override
public boolean equals(int position, int offset, Block otherBlock, int otherPosition, int otherOffset, int length)
{
checkReadablePosition(position);
Slice rawSlice = getRawSlice(position);
if (getSliceLength(position) < length) {
return false;
}
return otherBlock.bytesEqual(otherPosition, otherOffset, rawSlice, getPositionOffset(position) + offset, length);
}
@Override
public boolean bytesEqual(int position, int offset, Slice otherSlice, int otherOffset, int length)
{
checkReadablePosition(position);
return getRawSlice(position).equals(getPositionOffset(position) + offset, length, otherSlice, otherOffset, length);
}
@Override
public long hash(int position, int offset, int length)
{
checkReadablePosition(position);
return XxHash64.hash(getRawSlice(position), getPositionOffset(position) + offset, length);
}
@Override
public int compareTo(int position, int offset, int length, Block otherBlock, int otherPosition, int otherOffset, int otherLength)
{
checkReadablePosition(position);
Slice rawSlice = getRawSlice(position);
if (getSliceLength(position) < length) {
throw new IllegalArgumentException("Length longer than value length");
}
return -otherBlock.bytesCompare(otherPosition, otherOffset, otherLength, rawSlice, getPositionOffset(position) + offset, length);
}
@Override
public int bytesCompare(int position, int offset, int length, Slice otherSlice, int otherOffset, int otherLength)
{
checkReadablePosition(position);
return getRawSlice(position).compareTo(getPositionOffset(position) + offset, length, otherSlice, otherOffset, otherLength);
}
@Override
public void writeBytesTo(int position, int offset, int length, BlockBuilder blockBuilder)
{
checkReadablePosition(position);
blockBuilder.writeBytes(getRawSlice(position), getPositionOffset(position) + offset, length);
}
@Override
public void writeBytesTo(int position, int offset, int length, SliceOutput sliceOutput)
{
checkReadablePosition(position);
sliceOutput.writeBytes(getRawSlice(position), getPositionOffset(position) + offset, length);
}
@Override
public void writePositionTo(int position, BlockBuilder blockBuilder)
{
writeBytesTo(position, 0, getSliceLength(position), blockBuilder);
blockBuilder.closeEntry();
}
@Override
public void writePositionTo(int position, SliceOutput output)
{
if (isNull(position)) {
output.writeByte(0);
}
else {
output.writeByte(1);
int sliceLength = getSliceLength(position);
output.writeInt(sliceLength);
output.writeBytes(getRawSlice(position), getPositionOffset(position), sliceLength);
}
}
@Override
public Block getSingleValueBlock(int position)
{
if (isNull(position)) {
return new VariableWidthBlock(0, 1, EMPTY_SLICE, new int[] {0, 0}, new boolean[] {true});
}
int offset = getPositionOffset(position);
int entrySize = getSliceLength(position);
Slice copy = Slices.copyOf(getRawSlice(position), offset, entrySize);
return new VariableWidthBlock(0, 1, copy, new int[] {0, copy.length()}, null);
}
@Override
public long getEstimatedDataSizeForStats(int position)
{
return isNull(position) ? 0 : getSliceLength(position);
}
@Override
public boolean isNull(int position)
{
checkReadablePosition(position);
return isEntryNull(position);
}
protected void checkReadablePosition(int position)
{
checkValidPosition(position, getPositionCount());
}
}
