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public boolean performOk() { try { JUnitPlugin plugin= JUnitPlugingetPlugin(); if (autoTestgetSelection()) pluginaddAutoBuildNature(getProject()); else pluginremoveAutoBuildNature(getProject()); } catch (CoreException e) { // TODO Error dialog } return true; } We return true because we don't ever want to veto the acceptance of the changes We can run a run-time workspace to see the auto-test feature in action Once we've selected auto-test and clicked OK, the auto-test builder appears in our project's properties, as shown in Figure 197
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To further confirm that we are getting the expected results, we can start a run-time workbench There we can create a project, set the auto-test property, look at the contents of the project file, and see the auto-test nature and builder attached to our project
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<projectDescription> <name>Java Project</name> <comment></comment> <projects> </projects> <buildSpec> <buildCommand> <name>orgeclipsejdtcorejavabuilder</name> <arguments> </arguments> </buildCommand> <buildCommand> <name> orgeclipsecontributionjunitautoTestBuilder</name> <arguments> </arguments> </buildCommand> </buildSpec> <natures> <nature>orgeclipsejdtcorejavanature</nature> <nature>orgeclipsecontributionjunitautoTestNature</nature> </natures> </projectDescription> The main development of the auto-test feature is complete However, we still have a lot of polishing to do, starting with handling errors gracefully, whether we notify the user or just log the problem Reviewing this chapter, we Declared AutoTestPropertiesPage in the manifest We made sure it appeared in the Navigator and the Package Explorer by attaching it to IProjects and making it adaptable We made sure it only attached to Java projects by specifying a filter requiring the presence of the Java nature Implemented the AutoTestPropertiesPage, including using aGridLayout to enhance the appearance of the controls Implemented performOk() to install or uninstall the auto-test nature
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191 Forward Pointers
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Preference pages the implementation of a preference page is very similar to the implementation of a property page In fact, the class PropertyPage extends PreferencePage and adds the notion of an input When implementing a preference page you can also use field editors A field editor helps you manage and validate preference settings See wwweclipseorg/articles/Article-Field-Editors/field_editorshtml for more details
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20 Exception Handling
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Let's say you create a marvelously successful plug-in You have thousands no millions of satisfied customers What a disaster! Why a disaster Even with test-driven plug-in development some percentage of users will have problems The more users, the more problems Pretty soon, support costs will eat you out of house and home In this chapter we'll talk about Eclipse features that collectively reduce support costs:
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Handling Eclipse exceptions Presenting exceptions to the user using an error dialog Logging errors to the Eclipse log
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An important rule to improve the serviceability of your plug-ins is a bit of a paradox:
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RESPONSIBILITY RULE Clearly identify your plug-in as the source of problems
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How can telling the user a mistake is yours reduce your cost of service
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If you have an open source plug-in, the community will collectively provide first level service If you provide the necessary information in log entries and error dialogs, most problems will be solved before you ever see them If you know problems can be traced directly to your plug-in, you will be careful to write robust code The test-driven techniques introduced in the Interlude can go far towards eliminating problems at the source if applied carefully
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201 IStatus, CoreException
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To address the Responsibility Rule, exceptions thrown by plug-ins have to carry an IStatus object The IStatus object identifies the plug-in and contains a severity, a status code, a message, and optionally, an exception The contained exception typically comes from a lower layer that should not be exposed to clients CoreException is the root of the Eclipse exception hierarchy and carries anIStatus When an exception occurs, you want to inform the user that it happened If you cannot show the exception to the user, then you want to at least log it to help you service problem reports For example, it is always safe to inform the user of an exception when it happens in your action code Then you know the context the user is in, that is, they just invoked the action The situation is less clear when you don't know the calling context You have to decide whether you want to propagate the exception, inform the user, or to just log the exception Searching for references to CoreException is a good way to learn more about the Eclipse exception-handling conventions Of the many examples, we'll look at the code for opening a file in the workspace as implemented in the OpenWorkspaceFileAction: