Eclipse Plug-in Developer Guide (Galileo) - WorkbenchTriggerPointAdvisor (Eclipse Platform API Specification)

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Eclipse Platform
Release 3.5

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org.eclipse.ui.activities
Class WorkbenchTriggerPointAdvisor


java.lang.Object
  
org.eclipse.ui.activities.WorkbenchTriggerPointAdvisor

All Implemented Interfaces:: IExecutableExtension, ITriggerPointAdvisor

public class WorkbenchTriggerPointAdvisor
extends Object
implements ITriggerPointAdvisor, IExecutableExtension
extends Object
implements ITriggerPointAdvisor, IExecutableExtension

Workbench implementation prompts the user with a dialog unless they've said that they don't want to be prompted. You may provide the certain strings to this class via method #2 of IExecutableExtension. This is provided as API so that non-SDK Eclipse applications can reuse and augment the default SDK trigger point behaviour.

Since:: 3.1
See Also:: PROCEED_MULTI, PROCEED_SINGLE, DONT_ASK, NO_DETAILS

Field Summary

static String DONT_ASK
          The string to be used to label the "don't ask" button.

static String NO_DETAILS
          The string to be used when no activities are selected and Details are shown.

static String PROCEED_MULTI
          The string to be used when prompting to proceed with multiple activities.

static String PROCEED_SINGLE
          The string to be used when prompting to proceed with a single activity.

Constructor Summary

WorkbenchTriggerPointAdvisor ()
          Create a new instance of this advisor.

Method Summary

Set allow ( ITriggerPoint triggerPoint, IIdentifier identifier)
          Answer whether the activities bound to the identifier should be enabled when triggered by the provided trigger point.

boolean computeEnablement ( IActivityManager activityManager, IIdentifier identifier)
          This implementation of ITriggerPointAdvisor.computeEnablement(IActivityManager, IIdentifier) calls doComputeEnablement(IActivityManager, IIdentifier, boolean) with a boolean argument of false.

protected boolean doComputeEnablement ( IActivityManager activityManager, IIdentifier identifier, boolean disabledExpressionActivitiesTakePrecedence)
          Helper method for determining whether an identifier should be enabled.

void setInitializationData ( IConfigurationElement config, String propertyName, Object data)
          This method is called by the implementation of the method IConfigurationElement.createExecutableExtension on a newly constructed extension, passing it its relevant configuration information.

Methods inherited from class java.lang. Object

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

Field Detail

PROCEED_MULTI

public static 
String PROCEED_MULTI

The string to be used when prompting to proceed with multiple activities. Ie: "Enable the selected activities?"

PROCEED_SINGLE

public static 
String PROCEED_SINGLE

The string to be used when prompting to proceed with a single activity. Ie: "Enable the required activity?"

DONT_ASK

public static 
String DONT_ASK

The string to be used to label the "don't ask" button. Ie: "&Always enable activities and don't ask me again"

NO_DETAILS

public static 
String NO_DETAILS

The string to be used when no activities are selected and Details are shown. Ie: "Select an activity to view its description."

Constructor Detail

WorkbenchTriggerPointAdvisor

public WorkbenchTriggerPointAdvisor()

Create a new instance of this advisor.

Method Detail

allow

public 
Set allow(
ITriggerPoint triggerPoint,
                 
IIdentifier identifier)

Description copied from interface: ITriggerPointAdvisor

Answer whether the activities bound to the identifier should be enabled when triggered by the provided trigger point.

Specified by:: allow in interface ITriggerPointAdvisor

Parameters:: triggerPoint - the trigger point to test; identifier - the identifier to test against the trigger point
Returns:: the set of activities that should be enabled if this the contribution represented by this identifier is to be used. If this is not null, the caller can proceed with usage of the contribution provided that the collection of activities is enabled. If this is null, the caller should assume that the operation involving the contribution should be aborted. If this method returns the empty set then the operation can proceed without any changes to activity enablement state. Please note that it is the callers responsibility to ensure that the Set returned by this method is actually enabled - after setting the enabled state of the required activities the change should be verified by consulting IActivityManager.getEnabledActivityIds().

setInitializationData

public void setInitializationData(
IConfigurationElement config,
                                  
String propertyName,
                                  
Object data)

Description copied from interface: IExecutableExtension

This method is called by the implementation of the method IConfigurationElement.createExecutableExtension on a newly constructed extension, passing it its relevant configuration information. Most executable extensions only make use of the first two call arguments.

Regular executable extensions specify their Java implementation class name as an attribute of the configuration element for the extension. For example

     <action run="com.example.BaseAction"/>

In the above example, this method would be called with a reference to the <action> element (first argument), and "run" as the name of the attribute that defined this executable extension (second argument).

The last parameter is for the specific use of extension adapters and is typically not used by regular executable extensions.

There are two supported ways of associating additional adapter-specific data with the configuration in a way that is transparent to the extension point implementor:

(1) by specifying adapter data as part of the implementation class attribute value. The Java class name can be followed by a ":" separator, followed by any adapter data in string form. For example, if the extension point specifies an attribute "run" to contain the name of the extension implementation, an adapter can be configured as

     <action run="com.example.ExternalAdapter:./cmds/util.exe -opt 3"/>

(2) by converting the attribute used to specify the executable extension to a child element of the original configuration element, and specifying the adapter data in the form of xml markup. Using this form, the example above would become

     <action>
         <run class="com.xyz.ExternalAdapter">
             <parameter name="exec" value="./cmds/util.exe"/>
             <parameter name="opt"  value="3"/>
         </run>
     </action>

Form (2) will typically only be used for extension points that anticipate the majority of extensions configured into it will in fact be in the form of adapters.

In either case, the specified adapter class is instantiated using its 0-argument public constructor. The adapter data is passed as the last argument of this method. The data argument is defined as Object. It can have the following values:

null, if no adapter data was supplied
in case (1), the initialization data string is passed as a String
in case (2), the initialization data is passed as a Hashtable containing the actual parameter names and values (both Strings)

Specified by:: setInitializationData in interface IExecutableExtension

Parameters:: config - the configuration element used to trigger this execution. It can be queried by the executable extension for specific configuration properties; propertyName - the name of an attribute of the configuration element used on the createExecutableExtension(String) call. This argument can be used in the cases where a single configuration element is used to define multiple executable extensions.; data - adapter data in the form of a String, a Hashtable, or null.
See Also:: IConfigurationElement.createExecutableExtension(String)

computeEnablement

public boolean computeEnablement(
IActivityManager activityManager,
                                 
IIdentifier identifier)

This implementation of ITriggerPointAdvisor.computeEnablement(IActivityManager, IIdentifier) calls doComputeEnablement(IActivityManager, IIdentifier, boolean) with a boolean argument of false. Subclasses that wish to disable identifiers if there is at least one disabled expression-based activity should override this method and call doComputeEnablement(IActivityManager, IIdentifier, boolean) with a boolean argument of true. Subclasses may override.

Specified by:: computeEnablement in interface ITriggerPointAdvisor

Parameters:: activityManager - the activity manager; identifier - the identifier to update
Returns:: true if this identifier should be enabled, false otherwise
Since:: 3.4
See Also:: doComputeEnablement(IActivityManager, IIdentifier, boolean)

doComputeEnablement

protected boolean doComputeEnablement(
IActivityManager activityManager,
                                      
IIdentifier identifier,
                                      boolean disabledExpressionActivitiesTakePrecedence)

Helper method for determining whether an identifier should be enabled. Returns true if there is no applicable activity for the given identifier. Otherwise, if the boolean argument


 disabledExpressionActivitiesTakePrecedence

is false, returns true if any of the applicable activities is enabled. If the boolean argument is true, this method returns false if there is at least one disabled expression-based activity; and it returns true if there are no disabled expression-based activities and there is at least one applicable activity that is enabled.

Parameters:: activityManager - the activity manager; identifier - the identifier to update; disabledExpressionActivitiesTakePrecedence -
Returns:: true if this identifier should be enabled, false otherwise
Since:: 3.4