Figure 131 Views Live in Pages in Java

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Figure 131 Views Live in Pages
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This picture shows that the workbench window has several pages, only one of which is active at a time Each page contains views Shown here are some of the views in the Java perspective We'll need to get our view installed in this list Views are extensions of orgeclipseuiviews We can look at ContentOutline, for example:
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orgeclipseui/pluginxml
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<extension point="orgeclipseuiviews"> <view name="%ViewsContentOutline" icon="icons/full/cview16/outline_cogif" category="orgeclipseui" class="orgeclipseuiviewscontentoutlineContentOutline" id="orgeclipseuiviewsContentOutline"> </view> </extension> In a pattern that is becoming familiar, the view extension point has a collection of elements, each of which declares a view class to use when creating the view The icon and category are used to present the view inWindows > Show View We won't bother with this for our example Since we are test-driving our code when possible, the next thing we have to do is figure out how to test our new view To start we create a
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new test case ViewTest in our test plug-in orgeclipsecontributionjunittest Since we reference classes from orgeclipseui we add an import of this plug-in to the test plug-in's manifest and also update the project's build class path For the moment, it will be a step forward just to make the view appear We can test this by asking the active page to display a view whose id is orgeclipsecontributionjunitresultsView First we need a utility method which will return the current active page:
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orgeclipsecontributionjunittest/ViewTest
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private IWorkbenchPage getPage () { IWorkbench workbench= PlatformUIgetWorkbench(); IWorkbenchWindow window= workbenchgetActiveWorkbenchWindow(); return windowgetActivePage(); } [1] PlatformUI is a Fa ade for accessing the Eclipse user interface We use it to get at the workbench
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See E Gamma, R Helm, R Johnson, and J VlissidesDesign Patterns: Elements of Reusable Object-Oriented Software Addison-Wesley, Reading, MA, 1995
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Using this, we can write our test Tests should leave the world in exactly the state they found it We're careful to close the view before leaving the test:
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orgeclipsecontributionjunittest/ViewTest
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public void testShowHide() throws PartInitException { IViewPart view= getPage()showView( "orgeclipsecontributionjunitresultView" ); getPage()hideView(view); } This is an odd kind of test, containing no assertions We often start with such tests when we're taking baby steps They always grow some assertions Even without assertions, running the test gives us feedback Eclipse can't create the view (probably because we haven't implemented it) We use the common JUnit practice of just propagating exceptions in this case, the PartInitException
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orgeclipseuiPartInitException: Could not create view: orgeclipsecontributionjunit testView Copying the structure of our example, we next declare our view as an extension:
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orgeclipsecontributionjunit/pluginxml
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<extension point="orgeclipseuiviews">
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<view id="orgeclipsecontributionjunitresultView" name="Contributed Result View" class="orgeclipsecontributionjunitResultView"> </view> </extension> Running the test we get a new error message:
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orgeclipseuiPartInitException[0]: orgeclipsecoreruntime CoreException[2]: javalangClassNotFoundException: orgeclipse contributionjunitResultView Looking for extenders of orgeclipseuiviews, we find, for example,ContentOutline ContentOutline is a subclass of ViewPart, as are most implementors of IViewPart (check this withNavigate > Open Type In Hierarchy ) We will subclass ResultView from ViewPart also
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Interface/Implementation Pair
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IViewPart/ViewPart is an example of the Interface/Implementation Pair pattern that you will find in several places in the Eclipse API IViewPart defines the protocol for how clients interact with the view part Method signatures referring to a view in the Eclipse API therefore reference IViewPart ViewPart is an abstract base intended for implementors of a view It provides additional default behavior and simplifies implementing a view part
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The class creation wizard is good enough to provide stubs for the abstract superclass methods:
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orgeclipsecontributionjunit/ResultView
public class ResultView extends ViewPart { public void createPartControl(Composite parent) { } public void setFocus() { } } And our test passes By running a run-time workbench, we can see our view Figure 132 shows how to display our new view
The result (Figure 133) is a view with no contents
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[ Team LiB ]
132 Listening to Testing Progress
Now we want the view to turn colors when tests run If all tests run successfully, the view should turn green If a test fails, it should turn red We can divide the work to get this functionality running into two parts: 1 2 Setting up an ITestRunListener Responding to the test callbacks by changing the color
How do we want to set up a listener One way would be to extend the test listener extension point we declared towards the end of Circle One However, this would mean that our view would have to handle test callbacks whether it was open or not Using a dynamic listener better matches the life cycle of the view because the view can be opened and closed We first tested for this by checking to make sure a listener with a certain class was on the list of listeners This seemed to us a bit too tied to the implementation A simpler testing strategy is to just count the listeners When the view opens there should be one more listener than before, and after the view is closed there should be the same number as at the start First we introduce a couple of helper methods to make the tests read better and we also store the view in an instance variable: