Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.db.layer0 / src / org / simantics / db / layer0 / request / external / EclipsePreferencePrimitiveRead.java

diff --git a/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/external/EclipsePreferencePrimitiveRead.java b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/external/EclipsePreferencePrimitiveRead.java
new file mode 100644 (file)
index 0000000..e5ac0db
--- /dev/null
+++ b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/external/EclipsePreferencePrimitiveRead.java
@@ -0,0 +1,58 @@
+package org.simantics.db.layer0.request.external;\r
+\r
+import org.eclipse.core.runtime.preferences.IEclipsePreferences;\r
+import org.eclipse.core.runtime.preferences.IEclipsePreferences.IPreferenceChangeListener;\r
+import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent;\r
+import org.eclipse.core.runtime.preferences.InstanceScope;\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.common.request.ParametrizedPrimitiveRead;\r
+import org.simantics.db.procedure.Listener;\r
+import org.simantics.utils.datastructures.Pair;\r
+\r
+/**\r
+ * @author Antti Villberg\r
+ * @since 1.22.0\r
+ */\r
+public class EclipsePreferencePrimitiveRead extends ParametrizedPrimitiveRead<Pair<String,String>,String> implements IPreferenceChangeListener {\r
+\r
+    private Listener<String> listener;\r
+\r
+    public EclipsePreferencePrimitiveRead(String plugin, String key) {\r
+        super(Pair.make(plugin, key));\r
+    }\r
+\r
+    @Override\r
+    public void register(ReadGraph graph, Listener<String> procedure) {\r
+        IEclipsePreferences preferenceNode = resolvePreferenceNode();\r
+        if (!procedure.isDisposed() && preferenceNode != null) {\r
+            preferenceNode.addPreferenceChangeListener(this);\r
+        }\r
+        listener = procedure;\r
+        String value = preferenceNode != null ? preferenceNode.get(parameter.second, null) : null;\r
+        procedure.execute(value);\r
+    }\r
+\r
+    @Override\r
+    public void preferenceChange(PreferenceChangeEvent event) {\r
+        if (parameter.second.equals(event.getKey())) {\r
+            IEclipsePreferences preferenceNode = resolvePreferenceNode();\r
+            String value = preferenceNode != null ? preferenceNode.get(parameter.second, null) : null;\r
+            listener.execute(value);\r
+        }\r
+    }\r
+\r
+    @Override\r
+    public void unregistered() {\r
+        IEclipsePreferences preferenceNode = resolvePreferenceNode();\r
+        if (preferenceNode != null) {\r
+            preferenceNode.removePreferenceChangeListener(this);\r
+        }\r
+        listener = null;\r
+    }\r
+\r
+    private IEclipsePreferences resolvePreferenceNode() {\r
+        IEclipsePreferences preferenceNode = InstanceScope.INSTANCE.getNode( parameter.first );\r
+        return preferenceNode;\r
+    }\r
+\r
+}\r