Examples of org.openstreetmap.josm.command.Command

org.openstreetmap.josm.command.Command
Classes implementing Command modify a dataset in a specific way. A command is one atomic action on a specific dataset, such as move or delete. The command remembers the {@link OsmDataLayer} it is operating on. @author imi

     */
    public static void deleteRelation(OsmDataLayer layer, Relation toDelete) {
        CheckParameterUtil.ensureParameterNotNull(layer, "layer");
        CheckParameterUtil.ensureParameterNotNull(toDelete, "toDelete");


        Command cmd = DeleteCommand.delete(layer, Collections.singleton(toDelete));
        if (cmd != null) {
            // cmd can be null if the user cancels dialogs DialogCommand displays
            Main.main.undoRedo.add(cmd);
            if (getCurrentDataSet().getSelectedRelations().contains(toDelete)) {
                getCurrentDataSet().toggleSelected(toDelete);

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        Collection<Node> affectedNodes = AllNodesVisitor.getAllNodes(selection);
        // for these transformations, having only one node makes no sense - quit silently
        if (affectedNodes.size() < 2 && (mode == Mode.rotate || mode == Mode.scale)) {
            return false;
        }
        Command c = getLastCommand();
        if (mode == Mode.move) {
            if (startEN == null) return false; // fix #8128
            getCurrentDataSet().beginUpdate();
            if (c instanceof MoveCommand && affectedNodes.equals(((MoveCommand) c).getParticipatingPrimitives())) {
                ((MoveCommand) c).saveCheckpoint();

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    /**
     * Adapt last move command (if it is suitable) to work with next drag, started at point startEN
     */
    private void useLastMoveCommandIfPossible() {
        Command c = getLastCommand();
        Collection<Node> affectedNodes = AllNodesVisitor.getAllNodes(getCurrentDataSet().getSelected());
        if (c instanceof MoveCommand && affectedNodes.equals(((MoveCommand) c).getParticipatingPrimitives())) {
            // old command was created with different base point of movement, we need to recalculate it
            ((MoveCommand) c).changeStartPoint(startEN);
        }

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    /**
     * Obtain command in undoRedo stack to "continue" when dragging
     */
    private Command getLastCommand() {
        Command c = !Main.main.undoRedo.commands.isEmpty()
                ? Main.main.undoRedo.commands.getLast() : null;
        if (c instanceof SequenceCommand) {
            c = ((SequenceCommand) c).getLastCommand();
        }
        return c;

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        if (getRelationMemberConflictResolverModel().getNumDecisions() > 0) {
            cmds.addAll(getRelationMemberConflictResolverModel().buildResolutionCommands(targetPrimitive));
        }


        Command cmd = pnlRelationMemberConflictResolver.buildTagApplyCommands(getRelationMemberConflictResolverModel()
                .getModifiedRelations(targetPrimitive));
        if (cmd != null) {
            cmds.add(cmd);
        }
        return cmds;

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     * @return a list of commands
     */
    public List<Command> buildResolutionCommands(OsmPrimitive newPrimitive) {
        List<Command> command = new LinkedList<>();
        for (Relation relation : relations) {
            Command cmd = buildResolveCommand(relation, newPrimitive);
            if (cmd != null) {
                command.add(cmd);
            }
        }
        return command;

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            title = tr("Add a new node to an existing way");
        } else {
            title = tr("Add node into way and connect");
        }


        Command c = new SequenceCommand(title, cmds);


        Main.main.undoRedo.add(c);
        if(!wayIsFinished) {
            lastUsedNode = n;
        }

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    @Override
    public void actionPerformed(ActionEvent e) {
        Collection<Command> cmds = new LinkedList<>();
        for (Relation orig : relations) {
            Command c = GenericRelationEditor.addPrimitivesToRelation(orig, Main.main.getCurrentDataSet().getSelected());
            if (c != null) {
                cmds.add(c);
            }
        }
        if (!cmds.isEmpty()) {

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            return;
        Collection<? extends OsmPrimitive> oldSelection = Main.main.getCurrentDataSet().getSelected();
        Main.main.getCurrentDataSet().beginUpdate();
        try {
            for (int i=1; i<=num; ++i) {
                final Command c = commands.removeLast();
                c.undoCommand();
                redoCommands.addFirst(c);
                if (commands.isEmpty()) {
                    break;
                }
            }

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    public void redo(int num) {
        if (redoCommands.isEmpty())
            return;
        Collection<? extends OsmPrimitive> oldSelection = Main.main.getCurrentDataSet().getSelected();
        for (int i=0; i<num; ++i) {
            final Command c = redoCommands.removeFirst();
            c.executeCommand();
            commands.add(c);
            if (redoCommands.isEmpty()) {
                break;
            }
        }

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org.openstreetmap.josm.actions.mapmode.DeleteAction

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