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/*****************************************************************************
* Copyright (c) 2013, 2016 CEA LIST, Christian W. Damus, and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Camille Letavernier (CEA LIST) camille.letavernier@cea.fr - Initial API and implementation
* Christian W. Damus (CEA) - adapted for self-nesting behaviour
* Christian W. Damus - bug 485220
*
*****************************************************************************/
package org.eclipse.papyrus.commands;
import org.eclipse.core.commands.operations.IOperationHistory;
import org.eclipse.core.commands.operations.IUndoContext;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.OperationCanceledException;
import org.eclipse.emf.common.command.Command;
import org.eclipse.emf.transaction.RollbackException;
import org.eclipse.papyrus.infra.emf.gmf.command.NotifyingWorkspaceCommandStack;
/**
* @deprecated Use the {@link org.eclipse.papyrus.infra.emf.gmf.command.NestingNotifyingWorkspaceCommandStack} API, instead.
*/
@Deprecated
public class NestingNotifyingWorkspaceCommandStack extends NotifyingWorkspaceCommandStack {
private NestingNotifyingWorkspaceCommandStack childCommandStack;
private final boolean nested;
private boolean executing;
protected IUndoContext defaultUndoContext;
public NestingNotifyingWorkspaceCommandStack(IOperationHistory history) {
this(false, history, null);
}
protected NestingNotifyingWorkspaceCommandStack(boolean nested, IOperationHistory history, IUndoContext defaultUndoContext) {
super(history);
this.nested = nested;
this.defaultUndoContext = defaultUndoContext;
}
protected NestingNotifyingWorkspaceCommandStack(boolean nested, IOperationHistory history) {
this(nested, history, computeNestedUndoContext());
}
private static IUndoContext computeNestedUndoContext() {
return new IUndoContext() {
@Override
public boolean matches(IUndoContext context) {
return context == this;
}
@Override
public String getLabel() {
return "Nested Undo Context";
}
};
}
@Override
public IUndoContext getDefaultUndoContext() {
if (defaultUndoContext == null) {
return super.getDefaultUndoContext();
}
return defaultUndoContext;
}
protected NestingNotifyingWorkspaceCommandStack getTopMostCommandStack() {
if (childCommandStack == null) {
return this;
}
return childCommandStack.getTopMostCommandStack();
}
protected void startNestedTransaction(Command command) {
if (childCommandStack != null) {
// Forwards to the current stack
childCommandStack.startNestedTransaction(command);
} else {
// Start a new nested transaction in a new nested Stack
childCommandStack = createNestedCommandStack(getOperationHistory());
childCommandStack.setEditingDomain(getDomain());
childCommandStack.execute(command);
}
}
protected NestingNotifyingWorkspaceCommandStack createNestedCommandStack(IOperationHistory history) {
return new NestingNotifyingWorkspaceCommandStack(true, history);
}
public void commit() {
if (childCommandStack != null) {
disposeLastCommandStack();
}
}
private boolean disposeLastCommandStack() {
if (childCommandStack == null) {
// I'm the last command stack
dispose();
return true;
}
// Propagates
if (childCommandStack.disposeLastCommandStack()) {
childCommandStack = null;
}
return false;
}
public void rollback() {
if (childCommandStack != null) {
while (canUndo()) {
undo();
}
disposeLastCommandStack();
}
}
@Override
public void execute(Command command) {
if (childCommandStack == null) {
if (!executing) {
executing = true;
try {
super.execute(command);
} finally {
executing = false;
}
} else {
// Re-entrant command execution goes on a nested stack
try {
startNestedTransaction(command);
commit();
} catch (OperationCanceledException e) {
rollback();
// Propagate
throw e;
}
}
} else {
childCommandStack.execute(command);
}
}
@Override
protected void handleError(Exception exception) {
if (nested && (exception instanceof RollbackException)) {
// A nested transaction rolled back
RollbackException rbe = (RollbackException) exception;
if (rbe.getStatus().getSeverity() == IStatus.CANCEL) {
// Propagate
throw new OperationCanceledException();
}
}
if (exception instanceof OperationCanceledException) {
rollback();
} else {
super.handleError(exception);
}
}
@Override
public Command getMostRecentCommand() {
if (childCommandStack == null) {
return super.getMostRecentCommand();
} else {
return childCommandStack.getMostRecentCommand();
}
}
@Override
public Command getRedoCommand() {
if (childCommandStack == null) {
return super.getRedoCommand();
} else {
return childCommandStack.getRedoCommand();
}
}
@Override
public Command getUndoCommand() {
if (childCommandStack == null) {
return super.getUndoCommand();
} else {
return childCommandStack.getUndoCommand();
}
}
@Override
public void undo() {
if (childCommandStack == null) {
super.undo();
} else {
childCommandStack.undo();
}
}
@Override
public boolean canUndo() {
if (childCommandStack == null) {
return super.canUndo();
} else {
return childCommandStack.canUndo();
}
}
@Override
public boolean canRedo() {
if (childCommandStack == null) {
return super.canRedo();
} else {
return childCommandStack.canRedo();
}
}
@Override
public void redo() {
if (childCommandStack == null) {
super.redo();
} else {
childCommandStack.redo();
}
}
}
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