// This software is released into the Public Domain. See copying.txt for details.
package org.openstreetmap.osmosis.core.sort.v0_6;
import java.util.Comparator;
import java.util.Map;
import org.openstreetmap.osmosis.core.container.v0_6.ChangeContainer;
import org.openstreetmap.osmosis.core.lifecycle.ReleasableIterator;
import org.openstreetmap.osmosis.core.sort.common.FileBasedSort;
import org.openstreetmap.osmosis.core.store.SingleClassObjectSerializationFactory;
import org.openstreetmap.osmosis.core.task.v0_6.ChangeSink;
import org.openstreetmap.osmosis.core.task.v0_6.ChangeSinkChangeSource;
/**
* A change stream filter that sorts changes. The sort order is specified by
* comparator provided during instantiation.
*
* @author Brett Henderson
*/
public class ChangeSorter implements ChangeSinkChangeSource {
private FileBasedSort<ChangeContainer> fileBasedSort;
private ChangeSink changeSink;
/**
* Creates a new instance.
*
* @param comparator
* The comparator to use for sorting.
*/
public ChangeSorter(Comparator<ChangeContainer> comparator) {
fileBasedSort =
new FileBasedSort<ChangeContainer>(
new SingleClassObjectSerializationFactory(ChangeContainer.class), comparator, true);
}
/**
* {@inheritDoc}
*/
public void initialize(Map<String, Object> metaData) {
changeSink.initialize(metaData);
}
/**
* {@inheritDoc}
*/
public void process(ChangeContainer change) {
fileBasedSort.add(change);
}
/**
* {@inheritDoc}
*/
public void setChangeSink(ChangeSink changeSink) {
this.changeSink = changeSink;
}
/**
* {@inheritDoc}
*/
public void complete() {
try (ReleasableIterator<ChangeContainer> iterator = fileBasedSort.iterate()) {
while (iterator.hasNext()) {
changeSink.process(iterator.next());
}
changeSink.complete();
}
}
/**
* {@inheritDoc}
*/
public void close() {
fileBasedSort.close();
changeSink.close();
}
}