Bug 577782: [Preferences] Add PreferenceUtils.mergeNode
Change-Id: Icf47b05e69031e401b5ba2673c6523ef25672b38
diff --git a/ecommons/org.eclipse.statet.ecommons.preferences.core/src/org/eclipse/statet/ecommons/preferences/core/PreferenceUtils.java b/ecommons/org.eclipse.statet.ecommons.preferences.core/src/org/eclipse/statet/ecommons/preferences/core/PreferenceUtils.java
index 12c0a3c..a3ac241 100644
--- a/ecommons/org.eclipse.statet.ecommons.preferences.core/src/org/eclipse/statet/ecommons/preferences/core/PreferenceUtils.java
+++ b/ecommons/org.eclipse.statet.ecommons.preferences.core/src/org/eclipse/statet/ecommons/preferences/core/PreferenceUtils.java
@@ -14,6 +14,8 @@
package org.eclipse.statet.ecommons.preferences.core;
+import static org.eclipse.statet.jcommons.lang.ObjectUtils.nonNullAssert;
+
import java.util.List;
import java.util.Map;
@@ -26,6 +28,7 @@
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.core.runtime.preferences.IEclipsePreferences;
import org.eclipse.core.runtime.preferences.IScopeContext;
+import org.eclipse.core.runtime.preferences.InstanceScope;
import org.eclipse.statet.jcommons.lang.NonNullByDefault;
@@ -132,6 +135,29 @@
}
+ public static boolean mergeNode(final String fromQualifier, final String toQualifier)
+ throws BackingStoreException {
+ final IScopeContext scope= InstanceScope.INSTANCE;
+ if (scope.getNode("").nodeExists(fromQualifier)) { //$NON-NLS-1$
+ final var fromNode= scope.getNode(fromQualifier);
+ final var fromParent= nonNullAssert(fromNode.parent());
+ final var toNode= scope.getNode(toQualifier);
+ for (final String key : fromNode.keys()) {
+ final String value= fromNode.get(key, null);
+ if (value != null && toNode.get(key, null) == null) {
+ toNode.put(key, value);
+ }
+ }
+
+ toNode.flush();
+ fromNode.removeNode();
+ fromParent.flush();
+ return true;
+ }
+ return false;
+ }
+
+
private PreferenceUtils() {
}
