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CHAPTER 2 A Simple Plug-in Example
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Figure 2 5 New Plug-in Project wizard page 5 defining the view
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Figure 2 6 New Plug-in Project wizard page 6 code generation options for the view (Eclipse 33 only)
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Reviewing the code generated by the New Plug-in Project wizard provides a brief look at the following major parts comprising the sample plug-in The plug-in manifests The plug-in class The Favorites view
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The plug-in manifest editor shows the contents of the two plug-in manifest files, META-INF/MANIFESTMF and pluginxml, which define how this plugin relates to all the others in the system This editor is automatically opened to its first page (see Figure 2 9) as a result of creating a new plug-in project If the plug-in manifest editor is closed, double-clicking on either the METAINF/MANIFESTMF or the pluginxml file reopens the editor The following is an overview of the manifest editor, while more detail on the plug-in manifest itself can be found in 3 Although the editor is a convenient way to modify the plug-in s description, it s still useful to peek at the source behind the scenes to see how the editor s different parts relate to the underlying code Click the MANIFESTMF tab to display the source of the META-INF/MANIFESTMF file that defines the runtime aspects of this plug-in (see Figure 2 7) The first two lines define it as an OSGi manifest file (see Section 33, Plug-in Manifest, on page 113) Subsequent lines specify plug-in name, version, identifier, classpath, and plug-ins on which this plug-in depends All these aspects are editable using other pages in the plug-in manifest editor
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Figure 2 7 Plug-in manifest editor MANIFESTMF page
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true directive in the MANIFESTMF file has been replaced with Bundle-ActivationPolicy: lazy Both directives have the same semantics; only the name has changed
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CHAPTER 2 A Simple Plug-in Example
Clicking on the pluginxml tab of the editor displays the pluginxml file that defines the extension aspects of this plug-in (see Figure 2 8) The first line declares this to be an XML file, while subsequent lines specify plug-in extensions
Figure 2 8
Plug-in manifest editor pluginxml page
Figure 2 9 Plug-in manifest editor Overview page The This plug-in is a singleton option was added in Eclipse 34
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The Overview page of the manifest editor shows a summary of the plugin manifest (see Figure 2 9) The section on this page describing general information, such as the plug-in identifier (ID), version, name, class, and provider, corresponds to the first chunk of source in the META-INF/MANIFESTMF file:
Bundle-Name: Favorites Plug-in Bundle-SymbolicName: comqualityeclipsefavorites; singleton:=true Bundle-Version: 100 Bundle-Activator: comqualityeclipsefavoritesFavoritesActivator Bundle-Vendor: QualityEclipse Bundle-RequiredExecutionEnvironment: JavaSE-15
You can edit the information on the Overview page or switch to the MANIFESTMF page and edit the source directly
Tip: Making changes to any page other than the pluginxml and MANIFESTMF pages may cause the manifest editor to reformat the source If you are particular about the formatting of either manifest file, then either use only the pluginxml and MANIFESTMF pages to perform editing or use another editor Caution: The formatting rules of META-INF/MANIFESTMF include some quite nonintuitive rules related to line length and line wrapping Edit pluginxml with care, and META-INF/MANIFESTMF with caution!
The reliance of this plug-in on other plug-ins in the system appears on the Dependencies page of the plug-in manifest editor (see Figure 2 10)
Figure 2 10 Plug-in manifest editor Dependencies page
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CHAPTER 2 A Simple Plug-in Example
This corresponds to the Require-Bundle chunk of source in the
META-INF/MANIFESTMF file:
Require-Bundle: orgeclipseui, orgeclipsecoreruntime
For the Favorites plug-in, this section indicates a dependency on the
orgeclipsecoreruntime and orgeclipseui plug-ins This depen-
dency declaration differs from the Favorites project s Java build path (also known as the compile-time classpath) because the Java build path is a compile-time artifact, while the plug-in dependency declaration comes into play during plug-in execution Because the project was created as a plug-in project and has the orgeclipsepdePluginNature nature (see Section 143, Natures, on page 561 for more on project natures), any changes to this dependency list will automatically be reflected in the Java build path, but not the reverse If these two aspects of your plug-in get out of sync, then you can have a plug-in that compiles and builds but does not execute properly
Tip: Edit this dependency list rather than the Java build path so that the two are automatically always in sync
Alternatively, the dependencies could have been expressed as Imported Packages on the Dependencies page of the manifest editor (see Figure 2 10 and the end of Section 333, Plug-in dependencies, on page 116) This would correspond to an Import-Package chunk of source in the META-INF/ MANIFESTMF file looking something like this: