// License: GPL. For details, see LICENSE file.
package org.openstreetmap.josm.actions.downloadtasks;
import static org.openstreetmap.josm.tools.I18n.tr;
import java.awt.Component;
import java.io.IOException;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.data.osm.Changeset;
import org.openstreetmap.josm.data.osm.ChangesetCache;
import org.openstreetmap.josm.data.osm.ChangesetDataSet;
import org.openstreetmap.josm.gui.ExceptionDialogUtil;
import org.openstreetmap.josm.io.OsmTransferCanceledException;
import org.openstreetmap.josm.io.OsmTransferException;
import org.xml.sax.SAXException;
/**
* This is an asynchronous task for downloading the changeset content of a collection of changesets.
* @since 2689
*/
public class ChangesetContentDownloadTask extends AbstractChangesetDownloadTask {
class DownloadTask extends RunnableDownloadTask {
/** the list of changeset ids to download */
private final List<Integer> toDownload = new ArrayList<>();
DownloadTask(Component parent, Collection<Integer> ids) {
super(parent, tr("Downloading changeset content"));
for (Integer id: ids != null ? ids : Collections.<Integer>emptyList()) {
if (id == null || id <= 0) {
continue;
}
toDownload.add(id);
}
}
/**
* Downloads the changeset with id <code>changesetId</code> (only "header" information, no content)
*
* @param changesetId the changeset id
* @throws OsmTransferException if something went wrong
*/
protected void downloadChangeset(int changesetId) throws OsmTransferException {
Changeset cs = reader.readChangeset(changesetId, false, getProgressMonitor().createSubTaskMonitor(0, false));
ChangesetCache.getInstance().update(cs);
}
@Override
protected void realRun() throws SAXException, IOException, OsmTransferException {
try {
getProgressMonitor().setTicksCount(toDownload.size());
int i = 0;
for (int id: toDownload) {
i++;
if (!isAvailableLocally(id)) {
getProgressMonitor().setCustomText(tr("({0}/{1}) Downloading changeset {2}...", i, toDownload.size(), id));
downloadChangeset(id);
}
if (isCanceled())
return;
getProgressMonitor().setCustomText(tr("({0}/{1}) Downloading content for changeset {2}...", i, toDownload.size(), id));
ChangesetDataSet ds = reader.downloadChangeset(id, getProgressMonitor().createSubTaskMonitor(0, false));
Changeset cs = ChangesetCache.getInstance().get(id);
cs.setContent(ds);
ChangesetCache.getInstance().update(cs);
downloadedChangesets.add(cs);
getProgressMonitor().worked(1);
}
} catch (OsmTransferCanceledException e) {
// the download was canceled by the user. This exception is caught if the user canceled the authentication dialog.
setCanceled(true);
Main.trace(e);
return;
} catch (OsmTransferException e) {
if (isCanceled())
return;
rememberLastException(e);
}
}
@Override
protected void finish() {
rememberDownloadedData(downloadedChangesets);
if (isCanceled())
return;
if (lastException != null) {
ExceptionDialogUtil.explainException(lastException);
}
}
}
/**
* Creates a download task for a single changeset
*
* @param changesetId the changeset id. > 0 required.
* @throws IllegalArgumentException if changesetId <= 0
*/
public ChangesetContentDownloadTask(int changesetId) {
this(Main.parent, changesetId);
}
/**
* Creates a download task for a collection of changesets. null values and id <=0 in
* the collection are silently discarded.
*
* @param changesetIds the changeset ids. Empty collection assumed, if null.
*/
public ChangesetContentDownloadTask(Collection<Integer> changesetIds) {
this(Main.parent, changesetIds);
}
/**
* Creates a download task for a single changeset
*
* @param parent the parent component for the {@link org.openstreetmap.josm.gui.PleaseWaitDialog}. Must not be {@code null}.
* @param changesetId the changeset id. {@code >0} required.
* @throws IllegalArgumentException if {@code changesetId <= 0}
* @throws IllegalArgumentException if parent is {@code null}
*/
public ChangesetContentDownloadTask(Component parent, int changesetId) {
if (changesetId <= 0)
throw new IllegalArgumentException(
MessageFormat.format("Expected integer value > 0 for parameter ''{0}'', got ''{1}''", "changesetId", changesetId));
setDownloadTask(new DownloadTask(parent, Collections.singleton(changesetId)));
}
/**
* Creates a download task for a collection of changesets. null values and id <=0 in
* the collection are sillently discarded.
*
* @param parent the parent component for the {@link org.openstreetmap.josm.gui.PleaseWaitDialog}. Must not be {@code null}.
* @param changesetIds the changeset ids. Empty collection assumed, if {@code null}.
* @throws IllegalArgumentException if parent is {@code null}
*/
public ChangesetContentDownloadTask(Component parent, Collection<Integer> changesetIds) {
setDownloadTask(new DownloadTask(parent, changesetIds));
}
/**
* Replies true if the local {@link ChangesetCache} already includes the changeset with
* id <code>changesetId</code>.
*
* @param changesetId the changeset id
* @return true if the local {@link ChangesetCache} already includes the changeset with
* id <code>changesetId</code>
*/
protected static boolean isAvailableLocally(int changesetId) {
return ChangesetCache.getInstance().get(changesetId) != null;
}
}