1 files changed, 74 insertions, 0 deletions
diff --git a/plugins/org.eclipse.emf.cdo.security/src/org/eclipse/emf/cdo/internal/security/ViewUtil.java b/plugins/org.eclipse.emf.cdo.security/src/org/eclipse/emf/cdo/internal/security/ViewUtil.java
new file mode 100644
index 0000000000..f2468f6c07
--- /dev/null
+++ b/plugins/org.eclipse.emf.cdo.security/src/org/eclipse/emf/cdo/internal/security/ViewUtil.java
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2004 - 2012 Eike Stepper (Berlin, Germany) and others.
+ * 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:
+ *    Eike Stepper - initial API and implementation
+ */
+package org.eclipse.emf.cdo.internal.security;
+
+import org.eclipse.emf.cdo.common.revision.CDORevisionProvider;
+import org.eclipse.emf.cdo.view.CDOView;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * @author Eike Stepper
+ */
+public final class ViewUtil
+{
+  private static final ThreadLocal<ViewCreator> VIEW_CREATOR = new ThreadLocal<ViewCreator>();
+
+  private static final ThreadLocal<Map<CDORevisionProvider, CDOView>> VIEWS = new ThreadLocal<Map<CDORevisionProvider, CDOView>>();
+
+  private ViewUtil()
+  {
+  }
+
+  private static Map<CDORevisionProvider, CDOView> getViews()
+  {
+    Map<CDORevisionProvider, CDOView> views = VIEWS.get();
+    if (views == null)
+    {
+      views = new HashMap<CDORevisionProvider, CDOView>();
+      VIEWS.set(views);
+    }
+  
+    return views;
+  }
+
+  public static CDOView getView(CDORevisionProvider revisionProvider)
+  {
+    Map<CDORevisionProvider, CDOView> views = getViews();
+  
+    CDOView view = views.get(revisionProvider);
+    if (view == null)
+    {
+      ViewCreator viewCreator = VIEW_CREATOR.get();
+      if (viewCreator == null)
+      {
+        throw new IllegalStateException("No view creator available for " + revisionProvider);
+      }
+  
+      view = viewCreator.createView(revisionProvider);
+      views.put(revisionProvider, view);
+    }
+  
+    return view;
+  }
+
+  public static void initViewCreation(ViewCreator viewCreator)
+  {
+    VIEW_CREATOR.set(viewCreator);
+  }
+
+  public static void doneViewCreation()
+  {
+    VIEW_CREATOR.remove();
+    VIEWS.remove();
+  }
+}