Forward Pointers in Java

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183 Forward Pointers
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Passing arguments to a builder The build specification defined with ICommand allows you to register additional arguments in the form of key-value pairs One builder class can be used a little differently in different places Incremental build The AutoTestBuilder is not incremental Builders can access the list of changes since the last build (IncrementalProjectBuildergetDelta()) to limit the work they do The changes are stored in a resource delta For instance, the resource delta could be used to reduce the amount of searching for tests or to run only a the subset of the tests that possibly could have changed
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Nature image Natures can be presented to the user as adornments to project icons For additional background information on natures and builders refer to the article at wwweclipseorg/articles/Article-Builders/buildershtml
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19 Auto-Test Property
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We don't want auto-testing for all projects We would like to switch it off and on for individual projects In this chapter we will
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Create a project property page with a checkbox for auto testing so that the user can turn on and off the auto-test builder Call the methods that add or remove a nature First, we need to get the property page to appear when we bring up the properties of a Java project Eclipse can attach properties to any object As a developer, you can allow a user to edit the properties of anything To do so you provide property pages though an extension point In the property page, you decide how to store and retrieve the property values For example, Eclipse already supports attaching persistent properties to a resource We can copy the declaration from one of the other project property pages (see Figure 191)
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To find the property page extension point, we can use the plug-in search to find the declaration of an extension point called *property*, as shown in Figure 192
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Clicking on orgeclipsejdtui, we see many property pages Here's one:
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orgeclipsejdtui/pluginxml
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<extension point="orgeclipseuipropertyPages"> <page name="%buildPathPageName" id="orgeclipsejdtuipropertyPagesBuildPathsPropertyPage" objectClass="orgeclipsecoreresourcesIProject" class="orgeclipsejdtinternaluipreferences BuildPathsPropertyPage"> <filter name="nature" value="orgeclipsejdtcore javanature"/> </page> </extension> The Relevance Rule is in action in this declaration The filter element has a predefined set of possible keys: nature and persistent property
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The declaration above says only projects having the Java nature will show this property page Copying this into our manifest, we get:
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orgeclipsecontributionjunit/pluginxml
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<extension point="orgeclipseuipropertyPages"> <page id="orgeclipsecontributionjunitautotestproperty" name="Auto-test" objectClass="orgeclipsejdtcoreIJavaProject" class="orgeclipsecontributionjunitui AutoTestPropertyPage"> <filter name="nature" value="orgeclipsejdtcore javanature"/> </page> </extension> In the run-time workbench, we can create a Java project When we look at the project's properties, we see the name of the property page, as shown in Figure 193, but when we select it, we get an error because the class hasn't been implemented yet
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If we show the project in the Navigator (instead of the Package Explorer in the Java perspective), the property page doesn't appear Why not The object class specified in the declaration is checked against the type of the currently selected element In the Package Explorer, the elements are IJavaProjects The Navigator shows IProjects How can we make our property page appear in both places One solution used occasionally in Eclipse is to declare the property page twice, once for an IProject and once for anIJavaProject This is not an elegant solution A better solution, also used in Eclipse, is to enable the resource adapter for the contribution ( 31) Applying
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the resource adapter to an IJavaProject will reveal its IProject
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orgeclipsecontributionjunit/pluginxml
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<extension point="orgeclipseuipropertyPages"> <page id="orgeclipsecontributionjunitautotestproperty" name="Auto-test" objectClass="orgeclipsecoreresourcesIProject"
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adaptable="true"
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class="orgeclipsecontributionjunitui AutoTestPropertyPage"> <filter name="nature" value="orgeclipsejdtcore javanature"/> </page> </extension> At runtime, Eclipse will look at the selection If it's an IProject, no problem The property page sticks If the selection is anything else, Eclipse will ask to see if the selection can be adapted to an IProject (for more on adapters, see 31) IJavaProjects are adaptable to IProjects, so the page sticks Other elements are not adaptable to IProjects, so the page will not stick to, for example, compilation units To implement the property page, we can look at an example BuildPathsPropertyPage extends PropertyPage, so we will, too: