/*
* 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.raptor;
import com.facebook.presto.spi.ConnectorPageSource;
import com.facebook.presto.spi.Page;
import java.util.Iterator;
import static com.google.common.base.Preconditions.checkNotNull;
public class NoColumnsPageSource
implements ConnectorPageSource
{
private final Iterator<Integer> positionCounts;
private boolean closed;
public NoColumnsPageSource(Iterable<Integer> positionCounts)
{
this.positionCounts = checkNotNull(positionCounts, "positionCounts is null").iterator();
}
@Override
public long getTotalBytes()
{
return 0;
}
@Override
public long getCompletedBytes()
{
return 0;
}
@Override
public long getReadTimeNanos()
{
return 0;
}
@Override
public void close()
{
closed = true;
}
@Override
public boolean isFinished()
{
return closed;
}
@Override
public Page getNextPage()
{
if (closed) {
return null;
}
if (!positionCounts.hasNext()) {
closed = true;
return null;
}
return new Page(positionCounts.next());
}
}