Activities

Identifier:
org.eclipse.ui.activities

Since:

3.0

Description:

The org.eclipse.ui.activities extension point is used to declare activities and associated elements. Activities are used by the platform to filter certain plugin contributions from the users view until such a time that they express interest in them. This allows Eclipse to grow dynamically based on the usage pattern of a user.

Configuration Markup:

<!ELEMENT extension (activity , activityRequirementBinding , activityPatternBinding , category , categoryActivityBinding , defaultEnablement)*>

<!ATTLIST extension

id    CDATA #IMPLIED

name  CDATA #IMPLIED

point CDATA #REQUIRED>


<!ELEMENT activity (enabledWhen?)>

<!ATTLIST activity

description CDATA #IMPLIED

id          CDATA #REQUIRED

name        CDATA #REQUIRED>

This element is used to define activities. If more than one of these elements exist with the same id attribute, only the last declared element (in order of reading the registry) is considered valid.



<!ELEMENT activityRequirementBinding EMPTY>

<!ATTLIST activityRequirementBinding

requiredActivityId IDREF #REQUIRED

activityId         IDREF #REQUIRED>

This element allows one to bind activities to activities. The relationship is such that if the activityId is ever enabled then the requiredActivityId is enabled as well.



<!ELEMENT activityPatternBinding EMPTY>

<!ATTLIST activityPatternBinding

activityId        IDREF #REQUIRED

pattern           CDATA #REQUIRED

isEqualityPattern (true | false) >

This element allows one to bind activities to patterns.



<!ELEMENT category EMPTY>

<!ATTLIST category

description CDATA #IMPLIED

id          CDATA #REQUIRED

name        CDATA #REQUIRED>

This element is used to define categories. If more than one of these elements exist with the same id attribute, only the last declared element (in order of reading the registry) is considered valid.



<!ELEMENT categoryActivityBinding EMPTY>

<!ATTLIST categoryActivityBinding

activityId IDREF #REQUIRED

categoryId IDREF #REQUIRED>

This element allows one to bind categories to activities.



<!ELEMENT defaultEnablement EMPTY>

<!ATTLIST defaultEnablement

id IDREF #REQUIRED>

This element allows one to specify that a given activity should be enabled by default.



<!ELEMENT enabledWhen (not | and | or | instanceof | test | systemTest | equals | count | with | resolve | adapt | iterate | reference)>

Contains a core expression used by the workbench handler proxy to determine when this handler is enabled without loading it.



<!ELEMENT enablement (not , and , or , instanceof , test , systemTest , equals , count , with , resolve , adapt , iterate , reference)*>

A generic root element. The element can be used inside an extension point to define its enablement expression. The children of an enablement expression are combined using the "and" operator.



<!ELEMENT not (not | and | or | instanceof | test | systemTest | equals | count | with | resolve | adapt | iterate | reference)>

This element represents a NOT operation on the result of evaluating its sub-element expression.



<!ELEMENT and (not , and , or , instanceof , test , systemTest , equals , count , with , resolve , adapt , iterate , reference)*>

This element represents an AND operation on the result of evaluating all its sub-elements expressions.



<!ELEMENT or (not , and , or , instanceof , test , systemTest , equals , count , with , resolve , adapt , iterate , reference)*>

This element represent an OR operation on the result of evaluating all its sub-element expressions.



<!ELEMENT instanceof EMPTY>

<!ATTLIST instanceof

value CDATA #REQUIRED>

This element is used to perform an instanceof check of the object in focus. The expression returns EvaluationResult.TRUE if the object's type is a sub type of the type specified by the attribute value. Otherwise EvaluationResult.FALSE is returned.



<!ELEMENT test EMPTY>

<!ATTLIST test

property              CDATA #REQUIRED

args                  CDATA #IMPLIED

value                 CDATA #IMPLIED

forcePluginActivation (true | false) >

This element is used to evaluate the property state of the object in focus. The set of testable properties can be extended using the org.eclipse.core.expressions.propertyTesters extension point. The test expression returns EvaluationResult.NOT_LOADED if the property tester doing the actual testing isn't loaded yet and the attribute forcePluginActivation is set to false. If forcePluginActivation is set to true and the evaluation context used to evaluate this expression support plug-in activation then evaluating the property will result in activating the plug-in defining the tester.



<!ELEMENT systemTest EMPTY>

<!ATTLIST systemTest

property CDATA #REQUIRED

value    CDATA #REQUIRED>

Tests a system property by calling the System.getProperty method and compares the result with the value specified through the value attribute.



<!ELEMENT equals EMPTY>

<!ATTLIST equals

value CDATA #REQUIRED>

This element is used to perform an equals check of the object in focus. The expression returns EvaluationResult.TRUE if the object is equal to the value provided by the attribute value. Otherwise EvaluationResult.FALSE is returned.



<!ELEMENT count EMPTY>

<!ATTLIST count

value CDATA #REQUIRED>

This element is used to test the number of elements in a collection.



<!ELEMENT with (not , and , or , instanceof , test , systemTest , equals , count , with , resolve , adapt , iterate , reference)*>

<!ATTLIST with

variable CDATA #REQUIRED>

This element changes the object to be inspected for all its child element to the object referenced by the given variable. If the variable can not be resolved then the expression will throw an ExpressionException when evaluating it. The children of a with expression are combined using the "and" operator.



<!ELEMENT resolve (not , and , or , instanceof , test , systemTest , equals , count , with , resolve , adapt , iterate , reference)*>

<!ATTLIST resolve

variable CDATA #REQUIRED

args     CDATA #IMPLIED>

This element changes the object to be inspected for all its child element to the object referenced by the given variable. If the variable can not be resolved then the expression will throw an ExpressionException when evaluating it. The children of a resolve expression are combined using the "and" operator.



<!ELEMENT adapt (not , and , or , instanceof , test , systemTest , equals , count , with , resolve , adapt , iterate , reference)*>

<!ATTLIST adapt

type CDATA #REQUIRED>

This element is used to adapt the object in focus to the type specified by the attribute type. The expression returns EvaluationResult.NOT_LOADED if either the adapter or the type referenced isn't loaded yet. It throws an ExpressionException during evaluation if the type name doesn't exist at all. The children of an adapt expression are combined using the "and" operator.



<!ELEMENT iterate (not , and , or , instanceof , test , systemTest , equals , count , with , resolve , adapt , iterate , reference)*>

<!ATTLIST iterate

operator (or|and)

ifEmpty  (true | false) >

This element is used to iterate over a variable that is of type java.util.Collection, or a variable that adapts to org.eclipse.core.expressions.IIterable. If the object in focus is not one of the above then a CoreException with an ExpressionStatus will be thrown while evaluating the expression. The child expressions of an iterate expression are combined using the "and" operator.



<!ELEMENT reference EMPTY>

<!ATTLIST reference

definitionId IDREF #REQUIRED>

This element is used to reference an expression from the org.eclipse.core.expressions.definitions extension point. The expression definition will be evaluated within the current expression element using the current evaluation context.



<!ELEMENT enablement (not , and , or , instanceof , test , systemTest , equals , count , with , resolve , adapt , iterate , reference)*>

A generic root element. The element can be used inside an extension point to define its enablement expression. The children of an enablement expression are combined using the "and" operator.



<!ELEMENT not (not | and | or | instanceof | test | systemTest | equals | count | with | resolve | adapt | iterate | reference)>

This element represents a NOT operation on the result of evaluating its sub-element expression.



<!ELEMENT and (not , and , or , instanceof , test , systemTest , equals , count , with , resolve , adapt , iterate , reference)*>

This element represents an AND operation on the result of evaluating all its sub-elements expressions.



<!ELEMENT or (not , and , or , instanceof , test , systemTest , equals , count , with , resolve , adapt , iterate , reference)*>

This element represent an OR operation on the result of evaluating all its sub-element expressions.



<!ELEMENT instanceof EMPTY>

<!ATTLIST instanceof

value CDATA #REQUIRED>

This element is used to perform an instanceof check of the object in focus. The expression returns EvaluationResult.TRUE if the object's type is a sub type of the type specified by the attribute value. Otherwise EvaluationResult.FALSE is returned.



<!ELEMENT test EMPTY>

<!ATTLIST test

property              CDATA #REQUIRED

args                  CDATA #IMPLIED

value                 CDATA #IMPLIED

forcePluginActivation (true | false) >

This element is used to evaluate the property state of the object in focus. The set of testable properties can be extended using the org.eclipse.core.expressions.propertyTesters extension point. The test expression returns EvaluationResult.NOT_LOADED if the property tester doing the actual testing isn't loaded yet and the attribute forcePluginActivation is set to false. If forcePluginActivation is set to true and the evaluation context used to evaluate this expression support plug-in activation then evaluating the property will result in activating the plug-in defining the tester.



<!ELEMENT systemTest EMPTY>

<!ATTLIST systemTest

property CDATA #REQUIRED

value    CDATA #REQUIRED>

Tests a system property by calling the System.getProperty method and compares the result with the value specified through the value attribute.



<!ELEMENT equals EMPTY>

<!ATTLIST equals

value CDATA #REQUIRED>

This element is used to perform an equals check of the object in focus. The expression returns EvaluationResult.TRUE if the object is equal to the value provided by the attribute value. Otherwise EvaluationResult.FALSE is returned.



<!ELEMENT count EMPTY>

<!ATTLIST count

value CDATA #REQUIRED>

This element is used to test the number of elements in a collection.



<!ELEMENT with (not , and , or , instanceof , test , systemTest , equals , count , with , resolve , adapt , iterate , reference)*>

<!ATTLIST with

variable CDATA #REQUIRED>

This element changes the object to be inspected for all its child element to the object referenced by the given variable. If the variable can not be resolved then the expression will throw an ExpressionException when evaluating it. The children of a with expression are combined using the "and" operator.



<!ELEMENT resolve (not , and , or , instanceof , test , systemTest , equals , count , with , resolve , adapt , iterate , reference)*>

<!ATTLIST resolve

variable CDATA #REQUIRED

args     CDATA #IMPLIED>

This element changes the object to be inspected for all its child element to the object referenced by the given variable. If the variable can not be resolved then the expression will throw an ExpressionException when evaluating it. The children of a resolve expression are combined using the "and" operator.



<!ELEMENT adapt (not , and , or , instanceof , test , systemTest , equals , count , with , resolve , adapt , iterate , reference)*>

<!ATTLIST adapt

type CDATA #REQUIRED>

This element is used to adapt the object in focus to the type specified by the attribute type. The expression returns EvaluationResult.NOT_LOADED if either the adapter or the type referenced isn't loaded yet. It throws an ExpressionException during evaluation if the type name doesn't exist at all. The children of an adapt expression are combined using the "and" operator.



<!ELEMENT iterate (not , and , or , instanceof , test , systemTest , equals , count , with , resolve , adapt , iterate , reference)*>

<!ATTLIST iterate

operator (or|and)

ifEmpty  (true | false) >

This element is used to iterate over a variable that is of type java.util.Collection, or a variable that adapts to org.eclipse.core.expressions.IIterable. If the object in focus is not one of the above then a CoreException with an ExpressionStatus will be thrown while evaluating the expression. The child expressions of an iterate expression are combined using the "and" operator.



<!ELEMENT reference EMPTY>

<!ATTLIST reference

definitionId IDREF #REQUIRED>

This element is used to reference an expression from the org.eclipse.core.expressions.definitions extension point. The expression definition will be evaluated within the current expression element using the current evaluation context.



Examples:
The following is an example of several activity and category definitions as well as associated bindings.


 <extension point="org.eclipse.ui.activities">
  <activity id="com.xyz.Activity"
      description="Filters contributions from com.xyz"
   name="My Activity" />

  <activity id="com.xyz.OtherActivity"
      description="Filters other contributions from com.xyz"
   name="My Other Activity" />
  <!-- other activity requires activity -->  
  <activityRequirementBinding activityId="com.xyz.OtherActivity"
   requiredActivityId="com.xyz.Activity" />
  <category id="com.xyz.Category"
   description="com.xyz Activities"
   name="My Category" />
   
     <!-- put the activity in the category -->
  <categoryActivityBinding activityId="com.xyz.Activity"
   categoryId="com.xyz.Category" />
   
     <!-- bind all contributions from plugin com.xyz -->
  <activityPatternBinding id="com.xyz.Activity"
   pattern="com\.xyz/.*" />
  
  <!-- bind my.contribution from plugin com.xyz.other -->
  <activityPatternBinding id="com.xyz.OtherActivity"
   pattern="com\.xyz\.other/my.contribution" />
   
  <!-- the same, but not with a regular expression, since the pattern
          should match the id exactly anyway -->
  <activityPatternBinding id="com.xyz.OtherActivity"
   isEqualityPattern="true"
   pattern="com.xyz.other/my.contribution" />
   
  <!-- our activity should be enabled by default -->
  <defaultEnablement id="com.xyz.Activity" />  
 </extension>

API Information:

There is currently no public API for declaring activities or associated elements other than this extension point. The state of activities in the workbench is accessible via org.eclipse.ui.IWorkbench.getActivitySupport(). From here you may query and update the set of currently enabled activities.

Supplied Implementation:
There are no "default activities" provided by the workbench. Activities are intended to be defined at the product level, such as the Eclipse SDK, so as to tightly integrate all of the (known) components that product contains.


Copyright (c) 2000, 2005 IBM Corporation 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