/*
* 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.facebook.presto.spi.type.Type;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterators;
import com.google.common.util.concurrent.ListenableFuture;
import java.util.Iterator;
import java.util.List;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
public class ValuesOperator
implements Operator
{
public static class ValuesOperatorFactory
implements OperatorFactory
{
private final int operatorId;
private final List<Type> types;
private final List<Page> pages;
private boolean closed;
public ValuesOperatorFactory(int operatorId, List<Type> types, List<Page> pages)
{
this.operatorId = operatorId;
this.types = ImmutableList.copyOf(checkNotNull(types, "types is null"));
this.pages = ImmutableList.copyOf(checkNotNull(pages, "pages is null"));
}
@Override
public List<Type> getTypes()
{
return types;
}
@Override
public Operator createOperator(DriverContext driverContext)
{
checkState(!closed, "Factory is already closed");
OperatorContext operatorContext = driverContext.addOperatorContext(operatorId, ValuesOperator.class.getSimpleName());
return new ValuesOperator(operatorContext, types, pages);
}
@Override
public void close()
{
closed = true;
}
}
private final OperatorContext operatorContext;
private final ImmutableList<Type> types;
private final Iterator<Page> pages;
public ValuesOperator(OperatorContext operatorContext, List<Type> types, List<Page> pages)
{
this.operatorContext = checkNotNull(operatorContext, "operatorContext is null");
this.types = ImmutableList.copyOf(checkNotNull(types, "types is null"));
checkNotNull(pages, "pages is null");
checkArgument(!pages.isEmpty(), "pages is empty");
this.pages = ImmutableList.copyOf(pages).iterator();
}
@Override
public OperatorContext getOperatorContext()
{
return operatorContext;
}
@Override
public List<Type> getTypes()
{
return types;
}
@Override
public void finish()
{
Iterators.size(pages);
}
@Override
public boolean isFinished()
{
return !pages.hasNext();
}
@Override
public ListenableFuture<?> isBlocked()
{
return NOT_BLOCKED;
}
@Override
public boolean needsInput()
{
return false;
}
@Override
public void addInput(Page page)
{
throw new UnsupportedOperationException();
}
@Override
public Page getOutput()
{
if (!pages.hasNext()) {
return null;
}
Page page = pages.next();
if (page != null) {
operatorContext.recordGeneratedInput(page.getSizeInBytes(), page.getPositionCount());
}
return page;
}
}