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class TestReportContentProvider implements IStructuredContentProvider public Object[] getElements(Object inputElement) { return ((List)inputElement)toArray(); } } The method getElements() receives the input element as an argument and returns an array of domain objects that correspond to this element In our case, the input is a List of TestResults and all that needs to be done is to convert theList into an array Returning an array is consistent with the Eclipse convention to use arrays in the API wherever possible Let's move on to the update part of the task As test results are reported we want to update the table For this reason the TestReportContentProvider is also an ITestRunListener, as shown in Figure 239
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The TestReportContentProvider registers as a dynamic listener in its constructor and deregisters in the dispose() method
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class TestReportContentProvider implements IStructuredContentProvider, ITestRunListener { public TestReportContentProvider () { JUnitPlugingetPlugin()addTestListener(this); } public void dispose () { JUnitPlugingetPlugin()removeTestListener(this); } } To update the viewer when the domain model changes, the content provider needs a reference to the viewer Whenever the input of the viewer changes the content provider is informed with inputChanged() In addition to the new and old inputs the viewer is passed in and we can grab a reference to the viewer from there:
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private TableViewer viewer; public void inputChanged(Viewer tableViewer, Object oldInput, Object newInput) { viewer= (TableViewer)tableViewer; } The content provider gets informed about test progress, so it can now update the view The scheme we will use is that we store the TestResult object of the test run in progress We update the current result as we receive test notifications The first notification we will get is that the tests have started:
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public void testsStarted(IJavaProject project, int testCount) { ((List)viewergetInput())clear(); currentResult= null; viewerrefresh(); } From the viewer's input, we get at our list and clear it To update the viewer we call the refresh() method This method does a full refresh of the viewer from the domain model JFace viewers provide different methods to sync the widget with the domain The refresh() method is the most expensive one There are also methods to refresh single items Finally, we reset the currentResult to null Before we proceed, let's use the Extract Method refactoring to extract the cast into a separate method:
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private List getTestResults() { return (List) viewergetInput(); }
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When a test starts, we add the currentResult to the list and create a newTestResult:
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public void testStarted(IJavaProject project, String klass, String methodName) { addLastResult(); currentResult= new TestResult(project, klass, methodName, 0, SystemcurrentTimeMillis()); } When a test fails, we update the current test result:
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public void testFailed(IJavaProject project, String klass, String method, String trace) { currentResulttestFailed(); } Finally, when the test run is finished, we add the last result:
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public void testsFinished(IJavaProject project) { addLastResult(); } The only method left to look at is addLastResult() It updates our domain model and adds the result Next it appends the result to the viewer by calling insert() Insert() takes the domain object we want to add and the index where it should be added to the table We pass - to 1 indicate that it should be appended at the end Notice that communication with the viewer is always in terms of the domain objects and not in terms of SWT items Updating the corresponding SWT items is done in an optimized way inside the viewer and you don't have to worry about it
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private void addLastResult () { if (currentResult != null) { currentResulttestFinished(); getTestResults()add(currentResult); viewerinsert(currentResult, -1); } } Now is a good time to run our test The test is green We have the functionality we expected Let's also try the test report in auto-test mode We start our workbench, add the TestReportView with Window > Show View, and make a change A rebuild is triggered, but unfortunately, we get an exception:
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