TT 14 Builders, Markers, and Natures in Java

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TT 14 Builders, Markers, and Natures
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or remove aspects of itself from the project There are several natures defined within Eclipse providing various types of behavior:
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orgeclipsejdtcorejavanature
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- Associates the Eclipse in-
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cremental Java compiler with a project and causes the project to appear in Java related views such as the Package Explorer view
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orgeclipsepdePluginNature
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- Associates the plug-in manifest
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and extension-point schema builders with a project, validating the content of the pluginxml file and updating the project's Java Build Path based upon its plug-in dependency declaration (see Section 231)
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- Associates the feature builder
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with a project, validating the content of the featurexml file (see Section 1812)
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with a project, validating the content of the sitexml file (see Section 1832)
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Declaring a nature
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For our Favorites product, we want a new propertiesAuditor nature to associate our property file audit builder with a project We begin creating a new
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orgeclipsecoreresourcesnatures
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extension in our Favorites plug-in
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manifest Switch to the Extensions page, click the Add button, select Generic Wizards on the left and Schema-based Extension on the right, click Next, select orgeclipsecoreresourcesnatures and then Finish (see Figure 14-11)
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TT 14 Builders, Markers, and Natures
Figure 14-11 The New Extension wizard showing the orgeclipsecoreresourcesnatures extension point selected
Natures
Double-click on the new extension to open the properties file, change the id to propertiesAuditor , and change the name to Favorites Properties Auditor (see Figure 14-12) The nature declaration should look like this:
<extension id="propertiesAuditor" name="Favorites Properties Auditor" point="orgeclipsecoreresourcesnatures"> </extension>
Figure 14-12 The Properties view showing natures attributes
Similarly to build declarations, the nature declaration contains the nature s local identifier The nature s full identifier is the plug-in identifier containing the nature concatenated with the nature s local identifier, or in our case comqualityeclipsefavoritespropertiesAuditor
TT 14 Builders, Markers, and Natures
Associating builders and natures
Now we want to associate our builder with our nature Right-click on the
orgeclipsecoreresourcesnatures
extension-point and select New >
builder In the Properties view, enter the builder id, which in our case is
comqualityeclipsefavoritespropertiesFileAuditor
(see Figure 14-13)
Figure 14-13 The Properties view showing builder attributes
In addition, return to the builder declaration (see Section 1411) and modify the hasNature attribute to be "true" Once this has been accomplished, the nature declaration should look like this:
<extension id="propertiesAuditor" name="Favorites Properties Auditor" point="orgeclipsecoreresourcesnatures"> <builder id="comqualityeclipsefavorites propertiesFileAuditor"/> </extension>
Natures
These changes ensure that our builder will be omitted from a project s build process if our nature is not associated with the project If you want your builder to work regardless of whether or not your nature is present, then omit this from your nature s declaration
IProjectNature
Natures can have behavior to configure and deconfigure a project Similar to the Java nature, we want our nature to add our builder to the project's build spec Right-click on the orgeclipsecoreresourcesnatures extensionpoint and select New > runtime, then right-click on the (runtime) nested element and select New > run In the Properties view click on the button right of the class field, then use the Java Attribute Editor to generate a new class named PropertiesAuditorNature in the package
comqualityeclipsefavoritesbuilder
Once this is complete, the nature dec-
laration should look like this:
<extension id="propertiesAuditor" name="Favorites Properties Auditor" point="orgeclipsecoreresourcesnatures"> <builder id="comqualityeclipsefavorites
TT 14 Builders, Markers, and Natures
propertiesFileAuditor"/> <runtime> <run class="comqualityeclipsefavoritesbuilder PropertiesAuditorNature"/> </runtime> </extension>
The class specified in the nature declaration must implement
orgeclipsecoreresourcesIProjectNature
When the nature is added to a
project, this class is instantiated, the setProject( ) method called, followed by the configure() method; the deconfigure() method is called when the nature is removed from a project Similarly to the Java nature, we want our nature to add our builder to the project s build spec via the addBuilderToProject( )
method (see Section 1414) and trigger a build in the background
(see Section 208 Jobs API) when the project is configured When the nature is removed from the project, the build spec is modified and all audit markers removed:
package comqualityeclipsefavoritesbuilder; import orgeclipsecoreresources*; import orgeclipsecoreruntime*; public class PropertiesAuditorNature implements IProjectNature { private IProject project; public IProject getProject() {
Natures
return project; } public void setProject(IProject project) { thisproject = project; } public void configure() throws CoreException { PropertiesFileAuditoraddBuilderToProject(project); new Job("Properties File Audit") { protected IStatus run(IProgressMonitor monitor) { try { projectbuild( PropertiesFileAuditorFULL_BUILD, PropertiesFileAuditorBUILDER_ID, null, monitor); } catch (CoreException e) { FavoritesLoglogError(e); } return StatusOK_STATUS; } }schedule(); } public void deconfigure() throws CoreException { PropertiesFileAuditor removeBuilderFromProject(project); PropertiesFileAuditordeleteAuditMarkers(project); } }