/*
* 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.spi.Page;
import com.google.common.collect.ImmutableList;
import io.airlift.units.DataSize;
import java.util.ArrayList;
import java.util.List;
import static com.google.common.base.MoreObjects.toStringHelper;
import static com.google.common.base.Preconditions.checkState;
import static io.airlift.units.DataSize.Unit.BYTE;
import static java.util.Objects.requireNonNull;
public class NestedLoopJoinPagesBuilder
{
private final OperatorContext operatorContext;
private List<Page> pages;
private boolean finished;
private long estimatedSize;
NestedLoopJoinPagesBuilder(OperatorContext operatorContext)
{
this.operatorContext = requireNonNull(operatorContext, "operatorContext is null");
this.pages = new ArrayList<>();
}
public void addPage(Page page)
{
checkState(!finished, "NestedLoopJoinPagesBuilder is finished");
// ignore empty pages
if (page.getPositionCount() == 0) {
return;
}
pages.add(page);
estimatedSize += page.getRetainedSizeInBytes();
}
public DataSize getEstimatedSize()
{
return new DataSize(estimatedSize, BYTE);
}
public void compact()
{
checkState(!finished, "NestedLoopJoinPagesBuilder is finished");
pages.stream()
.forEach(Page::compact);
estimatedSize = pages.stream()
.mapToLong(Page::getRetainedSizeInBytes)
.sum();
}
public NestedLoopJoinPages build()
{
checkState(!finished, "NestedLoopJoinPagesBuilder is already finished");
finished = true;
pages = ImmutableList.copyOf(pages);
return new NestedLoopJoinPages(pages, getEstimatedSize(), operatorContext);
}
@Override
public String toString()
{
return toStringHelper(this)
.add("estimatedSize", estimatedSize)
.add("pageCount", pages.size())
.toString();
}
}