Object Actions in Java

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Object Actions
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the plug-in manifest, these mechanisms have the advantage that they do not require the plug-in to be loaded for Eclipse to use them
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6321 Basic filtering and enablement
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In Section 623, the nameFilter and objectClass attributes are examples of filters, while the enablesFor attribute determines when an action will be enabled When the context menu is activated, if the selection does not contain objects with names that match the wildcard nameFilter or are not of a type specified by the objectClass attribute, none of the actions defined in that object contribution will appear in the context menu In addition, the enablesFor attribute uses the following syntax to define exactly how many objects need to be selected for a particular action to be enabled: Syntax
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0 items selected 0 or 1 items selected 1 or more items selected 2 or more items selected
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Syntax
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a precise number of items selected For example: enablesFor=" 4" enables the action only when 4 items are selected
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any number of items selected
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The techniques listed above represent those most commonly used for limiting visibility and enablement of actions, but occasionally a more refined approach is needed The visibility and filter elements provide additional means to limit an action s visibility while the selection and enablement elements provide a more flexible way to specify when an action is enabled Still further refinement of action enablement can be provided via the selectionChanged( )
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method in the action delegate as discussed in Section 626
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The visibility element
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The visibility element provides an alternate and more powerful way to specify when an object contribution s actions will be available to the user as compared with the object contribution s nameFilter and objectClass For example, an alternate way to specify filtering for the object contribution described above would be
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Object Actions
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<objectContribution > <visibility> <objectClass name="orgeclipsecoreresourcesIResource"/> </visibility> the other stuff here </objectContribution>
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If the action is to be visible only for resources that are not read-only, then the visibility object contribution might look like this
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<objectContribution > <visibility> <and> <objectClass name="orgeclipsecoreresourcesIResource"/> <objectState name="readOnly" value="false"/> </and> </visibility> the other stuff here </objectContribution>
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As part of the <visibility> element declaration, you can use nested <and>, <or>, and <not> elements for logical expressions, plus the following boolean expressions:
objectClass - compares the class of the selected object against a name as shown above objectState - compares the state of the selected object against a specified state as shown above See Section 6323
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pluginState - Comparison of a plug-in state, indicating whether it is installed or activated For example, an expression such as
<pluginState id="orgeclipsepde" value="installed"/>
would cause an object contribution to be visible only if the
orgeclipsepde
plug-in is installed, and an expression
such as
<pluginState id="orgeclipsepde" value="activated"/>
would cause an object contribution to be visible only if the
orgeclipsepde
plug-in has been activated in some other
manner systemProperty - Comparison of a system property For example, if an object contribution should only be visible if the language is English, then the expression would be
<systemProperty name="userlanguage" value="en"/>
Object Actions
The filter element
The filter element is a simpler alternate form of the objectState element discussed above For example, if our object contribution was to be available for any non-read only file, then the object contribution could be expressed like this
<objectContribution > <filter name="readOnly" value="false"/> the other stuff here </objectContribution>
As with the objectState element, the filter element uses the IActionFilter
interface to determine whether or not an object in the selection matches
the criteria Each selected object must either implement or adapt to IActionFilter
interface (more on adapters in 20), and implement the appro-
priate behavior in the testAttribute( ) method to test the specified name/value pair against the state of the specified object For resources, Eclipse provides the following built in state comparisons as listed in the
orgeclipseuiIResourceActionFilter
class:
name - comparison of the file name "*" may be used at the
TT 6 Actions
start or the end to represent "one or more characters" extension - Comparison of the file extension path - Comparison against the file path "*" may be used at the start or the end to represent "one or more characters" readOnly - Comparison of the read only attribute of a file projectNature - Comparison of the project nature persistentProperty - Comparison of a persistent property on the selected resource If the value is a simple string, then this tests for the existence of the property on the resource If it has the format propertyName=propertyValue this obtains the value of the property with the specified name and tests it for equality with the specified value projectPersistentProperty - Comparison of a persistent property on the selected resource's project with similar semantics to the persistantProperty listed above sessionProperty - Comparison of a session property on the selected resource with similar semantics to the persistant-