com.facebook.presto.jdbc.internal.spi.block.SliceArrayBlock Maven / Gradle / Ivy
/*
* 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 com.facebook.presto.jdbc.internal.airlift.slice.SizeOf;
import com.facebook.presto.jdbc.internal.airlift.slice.Slice;
import java.util.Arrays;
public class SliceArrayBlock
extends AbstractVariableWidthBlock
{
private final int positionCount;
private final Slice[] values;
private final int sizeInBytes;
public SliceArrayBlock(int positionCount, Slice[] values)
{
this.positionCount = positionCount;
if (values.length < positionCount) {
throw new IllegalArgumentException("values length is less than positionCount");
}
this.values = values;
sizeInBytes = getSliceArraySizeInBytes(values);
}
Slice[] getValues()
{
return values;
}
@Override
protected Slice getRawSlice(int position)
{
return values[position];
}
@Override
protected int getPositionOffset(int position)
{
return 0;
}
@Override
protected boolean isEntryNull(int position)
{
return values[position] == null;
}
@Override
public BlockEncoding getEncoding()
{
return new SliceArrayBlockEncoding();
}
@Override
public int getPositionCount()
{
return positionCount;
}
@Override
public int getLength(int position)
{
return values[position].length();
}
@Override
public int getSizeInBytes()
{
return sizeInBytes;
}
@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[] newValues = Arrays.copyOfRange(values, positionOffset, positionOffset + length);
return new SliceArrayBlock(length, newValues);
}
@Override
public String toString()
{
StringBuilder sb = new StringBuilder("SliceArrayBlock{");
sb.append("positionCount=").append(getPositionCount());
sb.append('}');
return sb.toString();
}
static int getSliceArraySizeInBytes(Slice[] values)
{
long sizeInBytes = SizeOf.sizeOf(values);
for (Slice value : values) {
if (value != null) {
sizeInBytes += value.length();
}
}
if (sizeInBytes > Integer.MAX_VALUE) {
sizeInBytes = Integer.MAX_VALUE;
}
return (int) sizeInBytes;
}
}