// License: GPL. For details, see LICENSE file.
package org.openstreetmap.josm.gui.dialogs.relation;
import static org.openstreetmap.josm.tools.I18n.tr;
import java.io.IOException;
import java.util.Collection;
import javax.swing.SwingUtilities;
import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.data.osm.DataSet;
import org.openstreetmap.josm.data.osm.DataSetMerger;
import org.openstreetmap.josm.data.osm.Relation;
import org.openstreetmap.josm.gui.DefaultNameFormatter;
import org.openstreetmap.josm.gui.ExceptionDialogUtil;
import org.openstreetmap.josm.gui.PleaseWaitRunnable;
import org.openstreetmap.josm.gui.layer.OsmDataLayer;
import org.openstreetmap.josm.io.OsmServerObjectReader;
import org.openstreetmap.josm.io.OsmTransferException;
import org.openstreetmap.josm.tools.CheckParameterUtil;
import org.xml.sax.SAXException;
/**
* The asynchronous task for fully downloading a collection of relations. Does a full download
* for each relations and merges the relation into an {@link OsmDataLayer}
*
*/
public class DownloadRelationTask extends PleaseWaitRunnable {
private boolean canceled;
private Exception lastException;
private Collection<Relation> relations;
private OsmDataLayer layer;
private OsmServerObjectReader objectReader;
/**
* Creates the download task
*
* @param relations a collection of relations. Must not be null.
* @param layer the layer which data is to be merged into
* @throws IllegalArgumentException thrown if relations is null
* @throws IllegalArgumentException thrown if layer is null
*/
public DownloadRelationTask(Collection<Relation> relations, OsmDataLayer layer) throws IllegalArgumentException{
super(tr("Download relations"), false /* don't ignore exception */);
CheckParameterUtil.ensureParameterNotNull(relations, "relations");
CheckParameterUtil.ensureParameterNotNull(layer, "layer");
this.relations = relations;
this.layer = layer;
}
@Override
protected void cancel() {
canceled = true;
synchronized(this) {
if (objectReader != null) {
objectReader.cancel();
}
}
}
@Override
protected void finish() {
if (canceled)
return;
if (lastException != null) {
ExceptionDialogUtil.explainException(lastException);
}
}
@Override
protected void realRun() throws SAXException, IOException, OsmTransferException {
try {
final DataSet allDownloads = new DataSet();
int i=0;
getProgressMonitor().setTicksCount(relations.size());
for (Relation relation: relations) {
i++;
getProgressMonitor().setCustomText(tr("({0}/{1}): Downloading relation ''{2}''...", i,relations.size(),relation.getDisplayName(DefaultNameFormatter.getInstance())));
synchronized (this) {
if (canceled) return;
objectReader = new OsmServerObjectReader(relation.getPrimitiveId(), true /* full download */);
}
DataSet dataSet = objectReader.parseOsm(
getProgressMonitor().createSubTaskMonitor(0, false)
);
if (dataSet == null)
return;
synchronized (this) {
if (canceled) return;
objectReader = null;
}
DataSetMerger merger = new DataSetMerger(allDownloads, dataSet);
merger.merge();
getProgressMonitor().worked(1);
}
SwingUtilities.invokeAndWait(
new Runnable() {
@Override
public void run() {
layer.mergeFrom(allDownloads);
layer.onPostDownloadFromServer();
Main.map.repaint();
}
}
);
} catch (Exception e) {
if (canceled) {
Main.warn(tr("Ignoring exception because task was canceled. Exception: {0}", e.toString()));
return;
}
lastException = e;
}
}
}