add versioning to preference handling

Signed-off-by: Andre Bossert <anb0s@anbos.de>

Author: anb0s

plugin/src/de/anbos/eclipse/easyshell/plugin/Activator.java

@@ -21,9 +21,12 @@
 import org.eclipse.core.runtime.Path;
 import org.eclipse.core.runtime.Platform;
 import org.eclipse.core.runtime.Status;
+import org.eclipse.core.runtime.preferences.InstanceScope;
+import org.eclipse.jface.preference.IPreferenceStore;
 import org.eclipse.jface.resource.ImageDescriptor;
 import org.eclipse.jface.resource.ImageRegistry;
 import org.eclipse.ui.plugin.AbstractUIPlugin;
+import org.eclipse.ui.preferences.ScopedPreferenceStore;
 import org.osgi.framework.Bundle;
 import org.osgi.framework.BundleContext;
 
@@ -36,12 +39,17 @@
  */
 public class Activator extends AbstractUIPlugin {
 
-	// The shared instance
+    // The shared instance
 	private static Activator plugin;
 
     //Resource bundle.
     private ResourceBundle resourceBundle;
 
+    /**
+     * Storage for preferences.
+     */
+    private IPreferenceStore myPreferenceStore;
+
 	/**
 	 * The constructor
 	 */
@@ -213,4 +221,18 @@ public static void logDebug(String string) {
         }
     }
 
+    @Override
+    public IPreferenceStore getPreferenceStore() {
+        // Create the preference store lazily.
+        if (myPreferenceStore == null) {
+            myPreferenceStore = getNewPreferenceStoreByVersion(Constants.PREF_VERSIONS[0]);
+        }
+        return myPreferenceStore;
+    }
+
+    public IPreferenceStore getNewPreferenceStoreByVersion(String version) {
+        String pluginNodeName = getBundle().getSymbolicName();
+        return new ScopedPreferenceStore(InstanceScope.INSTANCE, pluginNodeName + "/" + version, pluginNodeName);
+    }
+
 }

plugin/src/de/anbos/eclipse/easyshell/plugin/Constants.java

@@ -16,7 +16,7 @@ public interface Constants {
     // Plugin
     public static final String PLUGIN_ID = "de.anbos.eclipse.easyshell.plugin";
 
-	// Images
+    // Images
     public static final String IMAGE_PATH        = "icons/";
     public static final String IMAGE_UNKNOWN     = "sample.gif";
     public static final String IMAGE_OPEN        = "prompt.gif";
@@ -26,6 +26,10 @@ public interface Constants {
     public static final String IMAGE_OTHER       = "editor.gif";
 
 	// Preferences
+    // version with index = 0 is the used one
+    public static final String[] PREF_VERSIONS   = {
+            "v2_0_001"
+    };
 	public static final String PREF_COMMANDS	 = "COMMANDS";
 	public static final String PREF_MENU         = "MENU";
 

plugin/src/de/anbos/eclipse/easyshell/plugin/preferences/Initializer.java

@@ -12,26 +12,35 @@
 package de.anbos.eclipse.easyshell.plugin.preferences;
 
 import org.eclipse.core.runtime.preferences.AbstractPreferenceInitializer;
+//import org.eclipse.core.runtime.preferences.IEclipsePreferences;
+//import org.eclipse.core.runtime.preferences.InstanceScope;
 import org.eclipse.jface.preference.IPreferenceStore;
+//import org.osgi.service.prefs.BackingStoreException;
+//import org.osgi.service.prefs.Preferences;
 
 import de.anbos.eclipse.easyshell.plugin.Activator;
 import de.anbos.eclipse.easyshell.plugin.Constants;
 
 public class Initializer extends AbstractPreferenceInitializer {
 
 	public void initializeDefaultPreferences() {
+	    // get the actual preference store
 		IPreferenceStore store = Activator.getDefault().getPreferenceStore();
+		/*
+		IEclipsePreferences instanceNode = InstanceScope.INSTANCE.getNode(Activator.PLUGIN_ID);
+		Preferences preferences = instanceNode.node(Constants.PREF_VERSIONS[0]);
+		preferences.put("test", "value");
+		try {
+            preferences.flush();
+        } catch (BackingStoreException e) {
+            // TODO Auto-generated catch block
+            e.printStackTrace();
+        }
+        */
 		String defaultCommand = PreferenceValueConverter.asCommandDataString(CommandDataDefaultCollection.getCommandsNative(null, true));
 		String defaultMenu    = PreferenceValueConverter.asCommandMenuDataString(CommandDataDefaultCollection.getCommandsNativeAsMenu(true));
 		store.setDefault(Constants.PREF_COMMANDS, defaultCommand);
 		store.setDefault(Constants.PREF_MENU, defaultMenu);
-		//getDefaultPresets();
-		/*
-		store.setDefault(PreferenceConstants.P_BOOLEAN, true);
-		store.setDefault(PreferenceConstants.P_CHOICE, "choice2");
-		store.setDefault(PreferenceConstants.P_STRING,
-				"Default value");
-		*/
 	}
 
 }