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Eclipse Platform
Release 3.5

org.eclipse.ui.commands
Interface ICommandService

All Superinterfaces:
IDisposable

public interface ICommandService
extends IDisposable

Provides services related to the command architecture within the workbench. This service can be used to access the set of commands and command categories.

This service can be acquired from your service locator:

        ICommandService service = (ICommandService) getSite().getService(ICommandService.class);
 
  • This service is available globally.

Since:
3.1
Restriction:
This interface is not intended to be implemented by clients.
Restriction:
This interface is not intended to be extended by clients.

Field Summary
static  String AUTOGENERATED_CATEGORY_ID
          The identifier of the category in which all auto-generated commands will appear.
 
Method Summary
 void addExecutionListener ( IExecutionListener listener)
          Adds an execution listener to the command service.
 void defineUncategorizedCategory ( String name, String description)
          Sets the name and description of the category for uncategorized commands.
  ParameterizedCommand deserialize ( String serializedParameterizedCommand)
           Returns a ParameterizedCommand with a command and parameterizations as specified in the provided serializedParameterizedCommand string.
  Category getCategory ( String categoryId)
          Retrieves the category with the given identifier.
  Command getCommand ( String commandId)
          Retrieves the command with the given identifier.
  Category[] getDefinedCategories ()
          Returns the collection of all of the defined categories in the workbench.
  Collection getDefinedCategoryIds ()
          Returns the collection of the identifiers for all of the defined categories in the workbench.
  Collection getDefinedCommandIds ()
          Returns the collection of the identifiers for all of the defined commands in the workbench.
  Command[] getDefinedCommands ()
          Returns the collection of all of the defined commands in the workbench.
  Collection getDefinedParameterTypeIds ()
          Returns the collection of the identifiers for all of the defined command parameter types in the workbench.
  ParameterType[] getDefinedParameterTypes ()
          Returns the collection of all of the defined command parameter types in the workbench.
  String getHelpContextId ( Command command)
          Gets the help context identifier for a particular command.
  String getHelpContextId ( String commandId)
          Gets the help context identifier for a particular command.
  ParameterType getParameterType ( String parameterTypeId)
          Retrieves the command parameter type with the given identifier.
 void readRegistry ()
           Reads the command information from the registry and the preferences.
 void refreshElements ( String commandId, Map filter)
          Refresh any elements registered against the command with the given id.
 void registerElement ( IElementReference elementReference)
          Re-register a callback element provided by the ICommandService.
  IElementReference registerElementForCommand ( ParameterizedCommand command, UIElement element)
          Register that this element accepts callbacks for this parameterized command.
 void removeExecutionListener ( IExecutionListener listener)
          Removes an execution listener from the command service.
 void setHelpContextId ( IHandler handler, String helpContextId)
          Sets the help context identifier to associate with a particular handler.
 void unregisterElement ( IElementReference elementReference)
          Unregister an element callback.
 
Methods inherited from interface org.eclipse.ui.services. IDisposable
dispose
 

Field Detail

AUTOGENERATED_CATEGORY_ID

static final 
String AUTOGENERATED_CATEGORY_ID
The identifier of the category in which all auto-generated commands will appear. This value must never be null.

Since:
3.2
See Also:
Constant Field Values
Method Detail

addExecutionListener

void addExecutionListener(
IExecutionListener listener)
Adds an execution listener to the command service. This listener will be notified as commands are executed.

Note: listeners should be removed when no longer necessary. If not, they will be removed when the IServiceLocator used to acquire this service is disposed.

Parameters:
listener - The listener to add; must not be null.
See Also:
removeExecutionListener(IExecutionListener)

defineUncategorizedCategory

void defineUncategorizedCategory(
String name,
                                 
String description)
Sets the name and description of the category for uncategorized commands. This is the category that will be returned if getCategory(String) is called with null.

Parameters:
name - The name of the category for uncategorized commands; must not be null.
description - The description of the category for uncategorized commands; may be null.
Since:
3.2

deserialize

ParameterizedCommand deserialize(
String serializedParameterizedCommand)
                                 throws 
NotDefinedException,
                                        
SerializationException

Returns a ParameterizedCommand with a command and parameterizations as specified in the provided serializedParameterizedCommand string. The serializedParameterizedCommand must use the format returned by ParameterizedCommand.serialize() and described in the Javadoc for that method.

If a parameter id encoded in the serializedParameterizedCommand does not exist in the encoded command, that parameter id and value are ignored. A given parameter id should not be used more than once in serializedParameterizedCommand. This will not result in an exception, but the value of the parameter when the command is executed cannot be specified here.

This method will never return null, however it may throw an exception if there is a problem processing the serialization string or the encoded command is undefined.

Parameters:
serializedParameterizedCommand - a String representing a command id and parameter ids and values
Returns:
a ParameterizedCommand with the command and parameterizations encoded in the serializedParameterizedCommand
Throws:
NotDefinedException - if the command indicated in serializedParameterizedCommand is not defined
SerializationException - if there is an error deserializing serializedParameterizedCommand
NotDefinedException
Since:
3.2
See Also:
ParameterizedCommand.serialize(), CommandManager.deserialize(String)

getCategory

Category getCategory(
String categoryId)
Retrieves the category with the given identifier. If no such category exists, then an undefined category with the given id is created.

Parameters:
categoryId - The identifier to find. If the category is null, then a category suitable for uncategorized items is defined and returned.
Returns:
A category with the given identifier, either defined or undefined.

getCommand

Command getCommand(
String commandId)
Retrieves the command with the given identifier. If no such command exists, then an undefined command with the given id is created.

Parameters:
commandId - The identifier to find; must not be null.
Returns:
A command with the given identifier, either defined or undefined.

getDefinedCategories

Category[] getDefinedCategories()
Returns the collection of all of the defined categories in the workbench.

Returns:
The collection of categories (Category) that are defined; never null, but may be empty.
Since:
3.2

getDefinedCategoryIds

Collection getDefinedCategoryIds()
Returns the collection of the identifiers for all of the defined categories in the workbench.

Returns:
The collection of category identifiers (String) that are defined; never null, but may be empty.

getDefinedCommandIds

Collection getDefinedCommandIds()
Returns the collection of the identifiers for all of the defined commands in the workbench.

Returns:
The collection of command identifiers (String) that are defined; never null, but may be empty.

getDefinedCommands

Command[] getDefinedCommands()
Returns the collection of all of the defined commands in the workbench.

Returns:
The collection of commands (Command) that are defined; never null, but may be empty.
Since:
3.2

getDefinedParameterTypeIds

Collection getDefinedParameterTypeIds()
Returns the collection of the identifiers for all of the defined command parameter types in the workbench.

Returns:
The collection of command parameter type identifiers (String) that are defined; never null, but may be empty.
Since:
3.2

getDefinedParameterTypes

ParameterType[] getDefinedParameterTypes()
Returns the collection of all of the defined command parameter types in the workbench.

Returns:
The collection of command parameter types (ParameterType) that are defined; never null, but may be empty.
Since:
3.2

getHelpContextId

String getHelpContextId(
Command command)
                        throws 
NotDefinedException
Gets the help context identifier for a particular command. The command's handler is first checked for a help context identifier. If the handler does not have a help context identifier, then the help context identifier for the command is returned. If neither has a help context identifier, then null is returned.

Parameters:
command - The command for which the help context should be retrieved; must not be null.
Returns:
The help context identifier to use for the given command; may be null.
Throws:
NotDefinedException - If the given command is not defined.
NotDefinedException
Since:
3.2

getHelpContextId

String getHelpContextId(
String commandId)
                        throws 
NotDefinedException
Gets the help context identifier for a particular command. The command's handler is first checked for a help context identifier. If the handler does not have a help context identifier, then the help context identifier for the command is returned. If neither has a help context identifier, then null is returned.

Parameters:
commandId - The identifier of the command for which the help context should be retrieved; must not be null.
Returns:
The help context identifier to use for the given command; may be null.
Throws:
NotDefinedException - If the command with the given identifier is not defined.
NotDefinedException
Since:
3.2

getParameterType

ParameterType getParameterType(
String parameterTypeId)
Retrieves the command parameter type with the given identifier. If no such parameter type exists, then an undefined parameter type with the given id is created.

Parameters:
parameterTypeId - The identifier to find; must not be null.
Returns:
A command parameter type with the given identifier, either defined or undefined.
Since:
3.2

readRegistry

void readRegistry()

Reads the command information from the registry and the preferences. This will overwrite any of the existing information in the command service. This method is intended to be called during start-up. When this method completes, this command service will reflect the current state of the registry and preference store.


removeExecutionListener

void removeExecutionListener(
IExecutionListener listener)
Removes an execution listener from the command service.

Parameters:
listener - The listener to remove; must not be null.

setHelpContextId

void setHelpContextId(
IHandler handler,
                      
String helpContextId)
Sets the help context identifier to associate with a particular handler.

Parameters:
handler - The handler with which to register a help context identifier; must not be null.
helpContextId - The help context identifier to register; may be null if the help context identifier should be removed.
Since:
3.2

registerElementForCommand

IElementReference registerElementForCommand(
ParameterizedCommand command,
                                            
UIElement element)
                                            throws 
NotDefinedException
Register that this element accepts callbacks for this parameterized command.

Note: elements should be removed when no longer necessary. If not, they will be removed when the IServiceLocator used to acquire this service is disposed.

Parameters:
command - The parameterized command that is already specialized. Must not be null.
element - The callback to register for this specialized command instance. Must not be null.
Returns:
A reference for the registered element that can be used to unregister it.
Throws:
NotDefinedException - If the command included in the ParameterizedCommand is not defined, or the element is null.
NotDefinedException
Since:
3.3
See Also:
unregisterElement(IElementReference)

registerElement

void registerElement(
IElementReference elementReference)
Re-register a callback element provided by the ICommandService. This element reference must not currently be held by the ICommandService. i.e. it must have been removed using unregisterElement(IElementReference).

Note: elements should be removed when no longer necessary. If not, they will be removed when the IServiceLocator used to acquire this service is disposed.

Parameters:
elementReference - The reference to re-register. Must not be null.
Since:
3.3
See Also:
unregisterElement(IElementReference)

unregisterElement

void unregisterElement(
IElementReference elementReference)
Unregister an element callback. It will be removed from the ICommandService. The same service that is used to register an element for a command must be used to unregister the element.

Parameters:
elementReference - The callback reference that was provided by the command service on registration. Must not be null.
Since:
3.3

refreshElements

void refreshElements(
String commandId,
                     
Map filter)
Refresh any elements registered against the command with the given id. It allows the active handler the opportunity to provide user feedback. If the command is parameterized, some of the parameters can be specified to help narrow down which elements to refresh.

The service locator used in registering the element can also be used to scope the search. For example: if you wanted all elements for your command but only within the part's workbench window, you could use:

 Map filter = new HashMap();
 filter.put(IServiceScopes.WINDOW_SCOPE, getSite().getPage()
                .getWorkbenchWindow());
 commandService.refreshElements(commandId, filter);
 

Parameters:
commandId - The command id to refresh if it has registered eleemnts.
filter - key-value pairs that can narrow down the callbacks to return. The parameters are ANDed together. This may be null.
Since:
3.3

Eclipse Platform
Release 3.5

Guidelines for using Eclipse APIs.

Copyright (c) Eclipse contributors and others 2000, 2008. All rights reserved.


 
 
  Published under the terms of the Eclipse Public License Version 1.0 ("EPL") Design by Interspire