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org.eclipse.emf.workspace.impl
Class WorkspaceCommandStackImpl


java.lang.Object
  extended by 

org.eclipse.emf.common.command.BasicCommandStack
      extended by 

org.eclipse.emf.transaction.impl.AbstractTransactionalCommandStack
          extended by 
org.eclipse.emf.workspace.impl.WorkspaceCommandStackImpl
All Implemented Interfaces:
CommandStack, InternalTransactionalCommandStack, TransactionalCommandStack, IWorkspaceCommandStack 
public class WorkspaceCommandStackImpl

extends 
AbstractTransactionalCommandStack

implements 
IWorkspaceCommandStack

Implementation of a transactional command stack that delegates execution of commands to an IOperationHistory.

This is the command stack implementation used by editing domains created by the WorkspaceEditingDomainFactory.

Field Summary
 
Fields inherited from class org.eclipse.emf.transaction.impl. AbstractTransactionalCommandStack
exceptionHandler
 
Fields inherited from class org.eclipse.emf.common.command. BasicCommandStack
commandList, listeners, mostRecentCommand, saveIndex, top
 
Constructor Summary
WorkspaceCommandStackImpl ( IOperationHistory history)
          Initializes me with the operation history to which I delegate command execution.
 
Method Summary
 boolean canRedo ()
          Queries whether we can redo my default undo context in my operation history.
 boolean canUndo ()
          Queries whether we can undo my default undo context in my operation history.
  EMFCommandTransaction createTransaction ( Command command, Map<?,?> options)
          Creates a read/write transaction in my editing domain for the purpose of executing the specified command.
 void dispose ()
          Disposes of my state and any additional resources that I may be retaining.
protected  void doExecute ( Command command, Map<?,?> options)
          Implemented by subclasses to perform the execution of the specified command.
 void executeTriggers ( Command command, List< Command> triggers, Map<?,?> options)
          Executes the specified list of trigger commands.
 void flush ()
          Disposes my default undo context in my operation history.
  IUndoContext getDefaultUndoContext ()
          Obtains the default undo context to add to the undoable operations that I execute on my operation history to wrap Commands.
protected   String getDefaultUndoContextLabel ()
          Obtains the label to display for the default undo context that I apply to operations executed through me as Commands.
  Command getMostRecentCommand ()
          Gets the command from the most recently executed, done, or redone operation.
  IOperationHistory getOperationHistory ()
          Obtains the operation history to which I delegate command execution.
  Command getRedoCommand ()
          Gets the command from the top of the redo history, if any.
  IResourceUndoContextPolicy getResourceUndoContextPolicy ()
          Obtains my resource undo-context policy.
protected   String getSavepointUndoContextLabel ()
          Obtains the label to display for the save-point undo context that I apply to the last operation in my default undo context that was executed at the time save was performed (as indicated by invocation of the saveIsDone() method).
  Command getUndoCommand ()
          Gets the command from the top of the undo history, if any.
 boolean isSaveNeeded ()
           
 void redo ()
          Redoes my default undo context in my operation history.
 void saveIsDone ()
           
 void setEditingDomain ( InternalTransactionalEditingDomain domain)
          Extends the superclass implementation to add/remove listeners on the editing domain.
 void setResourceUndoContextPolicy ( IResourceUndoContextPolicy policy)
          Sets my resource undo-context policy.
 void undo ()
          Undoes my default undo context in my operation history.
 
Methods inherited from class org.eclipse.emf.transaction.impl. AbstractTransactionalCommandStack
basicExecute, execute, execute, getDomain, getExceptionHandler, getUndoRedoOptions, handleError, handleRollback, makeTriggerTransactionOptions, rollback, setExceptionHandler
 
Methods inherited from class org.eclipse.emf.common.command. BasicCommandStack
addCommandStackListener, notifyListeners, removeCommandStackListener
 
Methods inherited from class java.lang. Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface org.eclipse.emf.transaction. TransactionalCommandStack
execute, getExceptionHandler, setExceptionHandler
 
Methods inherited from interface org.eclipse.emf.common.command. CommandStack
addCommandStackListener, execute, removeCommandStackListener
 

Constructor Detail

WorkspaceCommandStackImpl

public WorkspaceCommandStackImpl(
IOperationHistory history)
Initializes me with the operation history to which I delegate command execution.

Parameters:
history - my operation history
Method Detail

setEditingDomain

public void setEditingDomain(
InternalTransactionalEditingDomain domain)
Extends the superclass implementation to add/remove listeners on the editing domain.

Specified by:
setEditingDomain in interface InternalTransactionalCommandStack
Overrides:
setEditingDomain in class AbstractTransactionalCommandStack
Parameters:
domain - my editing domain
See Also:
InternalTransactionalCommandStack.createTransaction(Command, Map)

getOperationHistory

public final 
IOperationHistory getOperationHistory()
Description copied from interface: IWorkspaceCommandStack
Obtains the operation history to which I delegate command execution.

Specified by:
getOperationHistory in interface IWorkspaceCommandStack
Returns:
my operation history

getDefaultUndoContext

public final 
IUndoContext getDefaultUndoContext()
Description copied from interface: IWorkspaceCommandStack
Obtains the default undo context to add to the undoable operations that I execute on my operation history to wrap Commands. Moreover, undo, redo, and flush are context-specific operations in the operation history, so my undo/redo/flush commands use this context in delegating to the history. Likewise, the determination of the most recent command and undo/redo commands depends on this context.

Specified by:
getDefaultUndoContext in interface IWorkspaceCommandStack
Returns:
the default undo context for undo/redo/flush invocations
See Also:
TransactionalCommandStack.execute(Command, java.util.Map), CommandStack.undo(), CommandStack.redo(), CommandStack.flush(), CommandStack.getMostRecentCommand(), CommandStack.getUndoCommand(), CommandStack.getRedoCommand()

getDefaultUndoContextLabel

protected 
String getDefaultUndoContextLabel()
Obtains the label to display for the default undo context that I apply to operations executed through me as Commands. Subclasses may override to customize the label.

Returns:
my default undo context label
Since:
1.2

getSavepointUndoContextLabel

protected 
String getSavepointUndoContextLabel()
Obtains the label to display for the save-point undo context that I apply to the last operation in my default undo context that was executed at the time save was performed (as indicated by invocation of the saveIsDone() method). Subclasses may override to customize the label.

Returns:
my save-point undo context label
Since:
1.2

doExecute

protected void doExecute(
Command command,
                         
Map<?,?> options)
                  throws 
InterruptedException,
                         
RollbackException
Implemented by subclasses to perform the execution of the specified command. Invoked by the AbstractTransactionalCommandStack.execute(Command, Map) method.

Specified by:
doExecute in class AbstractTransactionalCommandStack
Parameters:
command - the command to execute
options - the transaction options to apply to execution of the command
Throws:
InterruptedException - if the current thread is interrupted while waiting to start the transaction
RollbackException - if the execution of the command is rolled back
Since:
1.1

canUndo

public boolean canUndo()
Queries whether we can undo my default undo context in my operation history.

Specified by:
canUndo in interface CommandStack
Overrides:
canUndo in class BasicCommandStack

undo

public void undo()
Undoes my default undo context in my operation history.

Specified by:
undo in interface CommandStack
Overrides:
undo in class BasicCommandStack

canRedo

public boolean canRedo()
Queries whether we can redo my default undo context in my operation history.

Specified by:
canRedo in interface CommandStack
Overrides:
canRedo in class BasicCommandStack

redo

public void redo()
Redoes my default undo context in my operation history.

Specified by:
redo in interface CommandStack
Overrides:
redo in class BasicCommandStack

flush

public void flush()
Disposes my default undo context in my operation history.

Specified by:
flush in interface CommandStack
Overrides:
flush in class BasicCommandStack

getMostRecentCommand

public 
Command getMostRecentCommand()
Gets the command from the most recently executed, done, or redone operation.

Specified by:
getMostRecentCommand in interface CommandStack
Overrides:
getMostRecentCommand in class BasicCommandStack

getUndoCommand

public 
Command getUndoCommand()
Gets the command from the top of the undo history, if any.

Specified by:
getUndoCommand in interface CommandStack
Overrides:
getUndoCommand in class BasicCommandStack

getRedoCommand

public 
Command getRedoCommand()
Gets the command from the top of the redo history, if any.

Specified by:
getRedoCommand in interface CommandStack
Overrides:
getRedoCommand in class BasicCommandStack

createTransaction

public 
EMFCommandTransaction createTransaction(
Command command,
                                               
Map<?,?> options)
                                        throws 
InterruptedException
Description copied from interface: InternalTransactionalCommandStack
Creates a read/write transaction in my editing domain for the purpose of executing the specified command. The resulting transaction is expected to be started when it is returned (hence the possibility of interruption).

Specified by:
createTransaction in interface InternalTransactionalCommandStack
Parameters:
command - a command that I need to execute
options - the options to apply to the resulting transaction
Returns:
the command transaction
Throws:
InterruptedException - if the current thread is interrupted while waiting for the transaction to start
See Also:
InternalTransactionalCommandStack.getDomain()

executeTriggers

public void executeTriggers(
Command command,
                            
List<
Command> triggers,
                            
Map<?,?> options)
                     throws 
InterruptedException,
                            
RollbackException
Description copied from interface: InternalTransactionalCommandStack
Executes the specified list of trigger commands. All of the commands are executed within a single child transaction of the transaction that executed the triggering command; they must not be "piggy-backed" on the currently active transaction.

Specified by:
executeTriggers in interface InternalTransactionalCommandStack
Parameters:
command - the command whose execution triggered additional commands (from pre-commit listeners)
triggers - a list of zero or more Commands to execute. If there are none, then no transaction needs to be started
options - the options to apply to the child transaction
Throws:
InterruptedException - if the current thread is interrupted while waiting for the trigger transaction to start
RollbackException - if the trigger transaction rolls back on commit
See Also:
ResourceSetListener.transactionAboutToCommit(org.eclipse.emf.transaction.ResourceSetChangeEvent), InternalTransactionalCommandStack.createTransaction(Command, Map)

dispose

public void dispose()
Description copied from interface: InternalTransactionalCommandStack
Disposes of my state and any additional resources that I may be retaining. I am only disposed when my editing domain is disposed.

Specified by:
dispose in interface InternalTransactionalCommandStack

getResourceUndoContextPolicy

public 
IResourceUndoContextPolicy getResourceUndoContextPolicy()
Obtains my resource undo-context policy.

Returns:
my resource undo-context policy
Since:
1.3

setResourceUndoContextPolicy

public void setResourceUndoContextPolicy(
IResourceUndoContextPolicy policy)
Sets my resource undo-context policy.

Parameters:
policy - my new policy, or null to restore the default
Since:
1.3

isSaveNeeded

public boolean isSaveNeeded()
Overrides:
isSaveNeeded in class BasicCommandStack

saveIsDone

public void saveIsDone()
Overrides:
saveIsDone in class BasicCommandStack
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