org.openstreetmap.josm.gui.dialogs.changeset

Class ChangesetContentDownloadTask

java.lang.Object

org.openstreetmap.josm.gui.PleaseWaitRunnable

org.openstreetmap.josm.gui.dialogs.changeset.ChangesetContentDownloadTask

All Implemented Interfaces:

Runnable, ChangesetDownloadTask, ProgressMonitor.CancelListener

public class ChangesetContentDownloadTask
extends PleaseWaitRunnable
implements ChangesetDownloadTask

This is an asynchronous task for downloading the changeset content of a collection of changesets.

Field Summary

Fields

Modifier and Type	Field and Description
private boolean	canceled true if the task was canceled
private Set<Changeset>	downloadedChangesets the set of downloaded changesets
private Exception	lastException keeps the last exception thrown in the task, if any
private OsmServerChangesetReader	reader the reader object used to read changesets from the API
private List<Integer>	toDownload the list of changeset ids to download

Fields inherited from class org.openstreetmap.josm.gui.PleaseWaitRunnable

progressMonitor

Constructor Summary

Constructors

Constructor and Description
ChangesetContentDownloadTask(Collection<Integer> changesetIds) Creates a download task for a collection of changesets. null values and id <=0 in the collection are sillently discarded.
ChangesetContentDownloadTask(Component parent, Collection<Integer> changesetIds) Creates a download task for a collection of changesets. null values and id <=0 in the collection are sillently discarded.
ChangesetContentDownloadTask(Component parent, int changesetId) Creates a download task for a single changeset
ChangesetContentDownloadTask(int changesetId) Creates a download task for a single changeset

Method Summary

Modifier and Type	Method and Description
protected void	cancel() User pressed cancel button.
protected void	downloadChangeset(int changesetId) Downloads the changeset with id changesetId (only "header" information, no content)
protected void	finish() Finish up the data work.
Set<Changeset>	getDownloadedChangesets()
protected void	init(Collection<Integer> ids) Initialize the task with a collection of changeset ids to download
protected boolean	isAvailableLocally(int changesetId) Replies true if the local ChangesetCache already includes the changeset with id changesetId.
boolean	isCanceled()
boolean	isFailed()
protected void	realRun() Called in the worker thread to do the actual work.

Methods inherited from class org.openstreetmap.josm.gui.PleaseWaitRunnable

afterFinish, canRunInBackground, getProgressMonitor, operationCanceled, run

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.lang.Runnable

run

Field Detail

toDownload

private final List<Integer> toDownload

the list of changeset ids to download

canceled

private boolean canceled

true if the task was canceled

lastException

private Exception lastException

keeps the last exception thrown in the task, if any

reader

private OsmServerChangesetReader reader

the reader object used to read changesets from the API

downloadedChangesets

private Set<Changeset> downloadedChangesets

the set of downloaded changesets

Constructor Detail

ChangesetContentDownloadTask

public ChangesetContentDownloadTask(int changesetId)
                             throws IllegalArgumentException

Creates a download task for a single changeset

Parameters:

changesetId - the changeset id. >0 required.

Throws:

IllegalArgumentException - thrown if changesetId <= 0

ChangesetContentDownloadTask

public ChangesetContentDownloadTask(Collection<Integer> changesetIds)

Creates a download task for a collection of changesets. null values and id <=0 in the collection are sillently discarded.

Parameters:

changesetIds - the changeset ids. Empty collection assumed, if null.

ChangesetContentDownloadTask

public ChangesetContentDownloadTask(Component parent,
                                    int changesetId)
                             throws IllegalArgumentException

Creates a download task for a single changeset

Parameters:

parent - the parent component for the PleaseWaitDialog. Must not be null.

changesetId - the changeset id. >0 required.

Throws:

IllegalArgumentException - thrown if changesetId <= 0

IllegalArgumentException - thrown if parent is null

ChangesetContentDownloadTask

public ChangesetContentDownloadTask(Component parent,
                                    Collection<Integer> changesetIds)
                             throws IllegalArgumentException

Creates a download task for a collection of changesets. null values and id <=0 in the collection are sillently discarded.

Parameters:

parent - the parent component for the PleaseWaitDialog. Must not be null.

changesetIds - the changeset ids. Empty collection assumed, if null.

Throws:

IllegalArgumentException - thrown if parent is null

Method Detail

init

protected void init(Collection<Integer> ids)

Initialize the task with a collection of changeset ids to download

Parameters:

ids - the collection of ids. May be null.

isAvailableLocally

protected boolean isAvailableLocally(int changesetId)

Replies true if the local ChangesetCache already includes the changeset with id changesetId.

Parameters:

changesetId - the changeset id

Returns:

true if the local ChangesetCache already includes the changeset with id changesetId

downloadChangeset

protected void downloadChangeset(int changesetId)
                          throws OsmTransferException

Downloads the changeset with id changesetId (only "header" information, no content)

Parameters:

changesetId - the changeset id

Throws:

OsmTransferException - thrown if something went wrong

cancel

protected void cancel()

Description copied from class: PleaseWaitRunnable

User pressed cancel button.

Specified by:

cancel in class PleaseWaitRunnable

finish

protected void finish()

Description copied from class: PleaseWaitRunnable

Finish up the data work. Is guaranteed to be called if realRun is called. Finish is called in the gui thread just after the dialog disappeared.

Specified by:

finish in class PleaseWaitRunnable

realRun

protected void realRun()
                throws SAXException,
                       IOException,
                       OsmTransferException

Description copied from class: PleaseWaitRunnable

Called in the worker thread to do the actual work. When any of the exception is thrown, a message box will be displayed and closeDialog is called. finish() is called in any case.

Specified by:

realRun in class PleaseWaitRunnable

Throws:

SAXException

IOException

OsmTransferException

getDownloadedChangesets

public Set<Changeset> getDownloadedChangesets()

Specified by:

getDownloadedChangesets in interface ChangesetDownloadTask

isCanceled

public boolean isCanceled()

Specified by:

isCanceled in interface ChangesetDownloadTask

isFailed

public boolean isFailed()

Specified by:

isFailed in interface ChangesetDownloadTask