X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.workbench%2Fsrc%2Forg%2Fsimantics%2Fworkbench%2Finternal%2Fcontributions%2Fsearch%2FActiveModelsListener.java;fp=bundles%2Forg.simantics.workbench%2Fsrc%2Forg%2Fsimantics%2Fworkbench%2Finternal%2Fcontributions%2Fsearch%2FActiveModelsListener.java;h=15e4599796f53edc5205013a978e89d4dd7d72cb;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

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
index 000000000..15e459979
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+++ b/bundles/org.simantics.workbench/src/org/simantics/workbench/internal/contributions/search/ActiveModelsListener.java
@@ -0,0 +1,58 @@
+/*******************************************************************************
+ * Copyright (c) 2014 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Semantum Oy - initial API and implementation
+ *******************************************************************************/
+package org.simantics.workbench.internal.contributions.search;
+
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Set;
+
+import org.eclipse.core.runtime.IStatus;
+import org.eclipse.core.runtime.Status;
+import org.simantics.db.Resource;
+import org.simantics.db.common.procedure.adapter.DisposableListener;
+import org.simantics.workbench.internal.Activator;
+
+/**
+ * @author Tuukka Lehtonen
+ */
+class ActiveModelsListener extends DisposableListener<Collection<Resource>> {
+
+    private Runnable callback;
+    private Set<Resource> previouslyActive;
+
+    public ActiveModelsListener(Runnable callback) {
+        if (callback == null)
+            throw new NullPointerException("null callback");
+        this.callback = callback;
+    }
+
+    @Override
+    public void execute(Collection<Resource> models) {
+        Set<Resource> set = new HashSet<Resource>(models);
+        Set<Resource> previous = previouslyActive;
+        if (previous != null && !previous.equals(set))
+            callback.run();
+        previouslyActive = set;
+    }
+
+    @Override
+    public void exception(Throwable t) {
+        Activator.getDefault().getLog().log(new Status(IStatus.ERROR, Activator.PLUGIN_ID, t.getLocalizedMessage(), t));
+    }
+
+    @Override
+    public void dispose() {
+        super.dispose();
+        previouslyActive = null;
+    }
+
+}
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