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PagesWindowIndex.java
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PagesWindowIndex.java
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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.operator.window;
import com.facebook.presto.operator.PagesIndex;
import com.facebook.presto.spi.block.BlockBuilder;
import io.airlift.slice.Slice;
import static com.google.common.base.MoreObjects.toStringHelper;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkElementIndex;
import static com.google.common.base.Preconditions.checkPositionIndex;
import static java.util.Objects.requireNonNull;
public class PagesWindowIndex
implements WindowIndex
{
private final PagesIndex pagesIndex;
private final int start;
private final int size;
public PagesWindowIndex(PagesIndex pagesIndex, int start, int end)
{
requireNonNull(pagesIndex, "pagesIndex is null");
checkPositionIndex(start, pagesIndex.getPositionCount(), "start");
checkPositionIndex(end, pagesIndex.getPositionCount(), "end");
checkArgument(start < end, "start must be before end");
this.pagesIndex = pagesIndex;
this.start = start;
this.size = end - start;
}
@Override
public int size()
{
return size;
}
@Override
public boolean isNull(int channel, int position)
{
return pagesIndex.isNull(channel, position(position));
}
@Override
public boolean getBoolean(int channel, int position)
{
return pagesIndex.getBoolean(channel, position(position));
}
@Override
public long getLong(int channel, int position)
{
return pagesIndex.getLong(channel, position(position));
}
@Override
public double getDouble(int channel, int position)
{
return pagesIndex.getDouble(channel, position(position));
}
@Override
public Slice getSlice(int channel, int position)
{
return pagesIndex.getSlice(channel, position(position));
}
@Override
public void appendTo(int channel, int position, BlockBuilder output)
{
pagesIndex.appendTo(channel, position(position), output);
}
private int position(int position)
{
checkElementIndex(position, size, "position");
return position + start;
}
@Override
public String toString()
{
return toStringHelper(this)
.add("size", size)
.toString();
}
}