Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.workbench / src / org / simantics / workbench / internal / contributions / search / ActiveModelsListener.java

diff --git a/bundles/org.simantics.workbench/src/org/simantics/workbench/internal/contributions/search/ActiveModelsListener.java b/bundles/org.simantics.workbench/src/org/simantics/workbench/internal/contributions/search/ActiveModelsListener.java
new file mode 100644 (file)
index 0000000..15e4599
--- /dev/null
+++ b/bundles/org.simantics.workbench/src/org/simantics/workbench/internal/contributions/search/ActiveModelsListener.java
@@ -0,0 +1,58 @@
+/*******************************************************************************\r
+ * Copyright (c) 2014 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ *     Semantum Oy - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.workbench.internal.contributions.search;\r
+\r
+import java.util.Collection;\r
+import java.util.HashSet;\r
+import java.util.Set;\r
+\r
+import org.eclipse.core.runtime.IStatus;\r
+import org.eclipse.core.runtime.Status;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.common.procedure.adapter.DisposableListener;\r
+import org.simantics.workbench.internal.Activator;\r
+\r
+/**\r
+ * @author Tuukka Lehtonen\r
+ */\r
+class ActiveModelsListener extends DisposableListener<Collection<Resource>> {\r
+\r
+    private Runnable callback;\r
+    private Set<Resource> previouslyActive;\r
+\r
+    public ActiveModelsListener(Runnable callback) {\r
+        if (callback == null)\r
+            throw new NullPointerException("null callback");\r
+        this.callback = callback;\r
+    }\r
+\r
+    @Override\r
+    public void execute(Collection<Resource> models) {\r
+        Set<Resource> set = new HashSet<Resource>(models);\r
+        Set<Resource> previous = previouslyActive;\r
+        if (previous != null && !previous.equals(set))\r
+            callback.run();\r
+        previouslyActive = set;\r
+    }\r
+\r
+    @Override\r
+    public void exception(Throwable t) {\r
+        Activator.getDefault().getLog().log(new Status(IStatus.ERROR, Activator.PLUGIN_ID, t.getLocalizedMessage(), t));\r
+    }\r
+\r
+    @Override\r
+    public void dispose() {\r
+        super.dispose();\r
+        previouslyActive = null;\r
+    }\r
+\r
+}
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