/*
* 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.operator;
import com.facebook.presto.block.Block;
import com.google.common.base.Function;
import com.google.common.base.Objects;
import com.google.common.base.Preconditions;
import io.airlift.units.DataSize;
import io.airlift.units.DataSize.Unit;
import java.util.Arrays;
public class Page
{
private final Block[] blocks;
private final int positionCount;
public Page(Block... blocks)
{
this(blocks[0].getPositionCount(), blocks);
}
public Page(int positionCount, Block... blocks)
{
Preconditions.checkNotNull(blocks, "blocks is null");
this.blocks = Arrays.copyOf(blocks, blocks.length);
this.positionCount = positionCount;
}
public int getChannelCount()
{
return blocks.length;
}
public int getPositionCount()
{
return positionCount;
}
public DataSize getDataSize()
{
long dataSize = 0;
for (Block block : blocks) {
dataSize += block.getDataSize().toBytes();
}
return new DataSize(dataSize, Unit.BYTE);
}
public Block[] getBlocks()
{
return blocks.clone();
}
public Block getBlock(int channel)
{
return blocks[channel];
}
public Function<Integer, Block> blockGetter()
{
return new Function<Integer, Block>() {
@Override
public Block apply(Integer input)
{
return getBlock(input);
}
};
}
@Override
public String toString()
{
return Objects.toStringHelper(this)
.add("positionCount", positionCount)
.add("channelCount", getChannelCount())
.addValue("@" + Integer.toHexString(System.identityHashCode(this)))
.toString();
}
}