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Eclipse Plug-in Development Beginner's Guide - Second Edition

You're reading from  Eclipse Plug-in Development Beginner's Guide - Second Edition

Product type Book
Published in Aug 2016
Publisher
ISBN-13 9781783980697
Pages 458 pages
Edition 2nd Edition
Languages
Author (1):
Alex Blewitt Alex Blewitt
Profile icon Alex Blewitt

Table of Contents (24) Chapters

Eclipse Plug-in Development Beginner's Guide Second Edition
Credits
Foreword
About the Author
Acknowledgments
About the Reviewers
www.PacktPub.com
Preface
1. Creating Your First Plug-in 2. Creating Views with SWT 3. Creating JFace Viewers 4. Interacting with the User 5. Working with Preferences 6. Working with Resources 7. Creating Eclipse 4 Applications 8. Migrating to Eclipse 4.x 9. Styling Eclipse 4 Applications 10. Creating Features, Update Sites, Applications, and Products 11. Automated Testing of Plug-ins 12. Automated Builds with Tycho 13. Contributing to Eclipse Using OSGi Services to Dynamically Wire Applications Pop Quiz Answers Index

Time for action – persisting a value


To save and load preferences, an instance of Preferences (from the org.osgi.service.prefs package) is typically obtained from an instance of InstanceScope (from the org.eclipse.core.runtime.preferences package). The INSTANCE singleton returns an instance of Preferences that has a getNode method. This returns a store that can be used to persist key/value pairs.

  1. Open the Activator of the com.packtpub.e4.clock.ui plug-in.

  2. Add the following to the start method to count the number of times the plug-in has been launched:

    // import org.osgi.service.prefs.Preferences;
    // import org.eclipse.core.runtime.preferences.InstanceScope;
    // ^ add these if necessary to top of the class
    Preferences preferences =
     InstanceScope.INSTANCE.getNode("com.packtpub.e4.clock.ui");
    int launchCount = preferences.getInt("launchCount", 0)+1;
    System.out.println("I have been launched "+launchCount+" times");
    preferences.putInt("launchCount", launchCount);
    preferences.sync();
  3. Run the target...

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