Book Image

Eclipse 4 Plug-in Development by Example : Beginner's Guide

By : Dr Alex Blewitt
Book Image

Eclipse 4 Plug-in Development by Example : Beginner's Guide

By: Dr Alex Blewitt

Overview of this book

<p>As a highly extensible platform, Eclipse is used by everyone from independent software developers to NASA. Key to this is Eclipse’s plug-in ecosystem, which allows applications to be developed in a modular architecture and extended through its use of plug-ins and features.<br /><br />"Eclipse 4 Plug-in Development by Example Beginner's Guide" takes the reader through the full journey of plug-in development, starting with an introduction to Eclipse plug-ins, continued through packaging and culminating in automated testing and deployment. The example code provides simple snippets which can be developed and extended to get you going quickly.</p> <p>This book covers basics of plug-in development, creating user interfaces with both SWT and JFace, and interacting with the user and execution of long-running tasks in the background.</p> <p>Example-based tasks such as creating and working with preferences and advanced tasks such as well as working with Eclipse’s files and resources. A specific chapter on the differences between Eclipse 3.x and Eclipse 4.x presents a detailed view of the changes needed by applications and plug-ins upgrading to the new model. Finally, the book concludes on how to package plug-ins into update sites, and build and test them automatically.</p>
Table of Contents (19 chapters)
Eclipse 4 Plug-in Development by Example Beginner's Guide
Credits
About the Author
Acknowledgement
About the Reviewers
www.PacktPub.com
Preface
Index

Time for action – handling deletion


The incremental builder does not handle deletions in its current implementation. To handle deletion, IResourceDelta needs to be inspected to find out what kind of delta took place, and the delete handled accordingly.

Perform the following steps:

  1. Run the Eclipse instance and delete a .minimark file. An exception is thrown and reported to the user:

  2. To fix this issue, modify the check in MinimarkVisitor class' processResource() method to see if the resource exists or not:

    private void processResource(IResource resource) throwsCoreException {
      if (resource instanceof IFile && resource.exists()) {
  3. This solves the NullPointerException, but the generated HTML file is left behind. To clean up the associated .html file if the .minimark file is being deleted, the resource delta's flags can be inspected to see if it is deleted, and if so, the corresponding HTML file can be deleted as well. Modify the visit( IResourceDelta) method as follows:

    public boolean visit...