/*
* 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.Slice;
import com.facebook.presto.jdbc.internal.airlift.slice.Slices;
public abstract class AbstractVariableWidthBlock
implements Block
{
protected abstract Slice getRawSlice(int position);
protected abstract int getPositionOffset(int position);
protected abstract boolean isEntryNull(int position);
@Override
public BlockEncoding getEncoding()
{
return new VariableWidthBlockEncoding();
}
@Override
public byte getByte(int position, int offset)
{
checkReadablePosition(position);
return getRawSlice(position).getByte(getPositionOffset(position) + offset);
}
@Override
public short getShort(int position, int offset)
{
checkReadablePosition(position);
return getRawSlice(position).getShort(getPositionOffset(position) + offset);
}
@Override
public int getInt(int position, int offset)
{
checkReadablePosition(position);
return getRawSlice(position).getInt(getPositionOffset(position) + offset);
}
@Override
public long getLong(int position, int offset)
{
checkReadablePosition(position);
return getRawSlice(position).getLong(getPositionOffset(position) + offset);
}
@Override
public float getFloat(int position, int offset)
{
checkReadablePosition(position);
return getRawSlice(position).getFloat(getPositionOffset(position) + offset);
}
@Override
public double getDouble(int position, int offset)
{
checkReadablePosition(position);
return getRawSlice(position).getDouble(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 (getLength(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 int hash(int position, int offset, int length)
{
checkReadablePosition(position);
return getRawSlice(position).hashCode(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 (getLength(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 Block getSingleValueBlock(int position)
{
if (isNull(position)) {
return new VariableWidthBlock(1, Slices.wrappedBuffer(new byte[0]), new int[] {0, 0}, new boolean[] {true});
}
int offset = getPositionOffset(position);
int entrySize = getLength(position);
Slice copy = Slices.copyOf(getRawSlice(position), offset, entrySize);
return new VariableWidthBlock(1, copy, new int[] {0, copy.length()}, new boolean[] {false});
}
@Override
public boolean isNull(int position)
{
checkReadablePosition(position);
return isEntryNull(position);
}
@Override
public void release()
{
}
private void checkReadablePosition(int position)
{
if (position < 0 || position >= getPositionCount()) {
throw new IllegalArgumentException("position is not valid");
}
}
}