EDIT: Context menu entry is now only shown when the selection is an IProject which is open.

Author: tsaglam

plugin.xml

@@ -4,33 +4,38 @@
    <extension point="org.eclipse.ui.commands">
       <category name="JCE" id="JCE.commands.category" />
       <command name="Ecorify From..." categoryId="JCE.commands.category" id="JCE.commands.ecorifyCommand" />
-      <command
-            categoryId="JCE.commands.category"
-            id="JCE.commands.extractCommand"
-            name="Extract From...">
-      </command>
+      <command categoryId="JCE.commands.category" id="JCE.commands.extractCommand" name="Extract From..." />
    </extension>
    <extension point="org.eclipse.ui.handlers">
       <handler commandId="JCE.commands.ecorifyCommand" class="jce.handlers.EcorificationHandler" />
-      <handler
-            class="jce.handlers.ExtractionHandler"
-            commandId="JCE.commands.extractCommand">
-      </handler>
+      <handler class="jce.handlers.ExtractionHandler" commandId="JCE.commands.extractCommand" />
    </extension>
    <extension point="org.eclipse.ui.menus">
-      <menuContribution locationURI="popup:org.eclipse.jdt.ui.PackageExplorer">
-         <menu
-               icon="src/main/resources/jce.gif"
-               label="JCE"
-               tooltip="Java Code Ecorification">
-            <command commandId="JCE.commands.ecorifyCommand" id="JCE.menus.extractCommand" label="Ecorify Java Project..." mnemonic="S" tooltip="Start the Ecorification of Java code." />
-            <command
-                  commandId="JCE.commands.extractCommand"
-                  id="JCE.menus.extractCommand"
-                  label="Extract Ecore Metamodel..."
-                  tooltip="Start only the Ecore metamodel extraction of the Ecorification of Java code.">
+      <menuContribution locationURI="popup:org.eclipse.ui.popup.any">
+         <menu icon="src/main/resources/jce.gif" label="JCE" tooltip="Java Code Ecorification">
+            <command commandId="JCE.commands.ecorifyCommand" id="JCE.menus.extractCommand" label="Ecorify Java Project..." mnemonic="S" tooltip="Start the Ecorification of Java code.">
+               <visibleWhen>
+                  <with variable="activeMenuSelection">
+                     <iterate ifEmpty="false">
+                        <adapt type="org.eclipse.core.resources.IProject">
+                           <test property="org.eclipse.core.resources.open" value="open" />
+                        </adapt>
+                     </iterate>
+                  </with>
+               </visibleWhen>
+            </command>
+            <command commandId="JCE.commands.extractCommand" id="JCE.menus.extractCommand" label="Extract Ecore Metamodel..." tooltip="Start only the Ecore metamodel extraction of the Ecorification of Java code.">
+               <visibleWhen>
+                  <with variable="activeMenuSelection">
+                     <iterate ifEmpty="false">
+                        <adapt type="org.eclipse.core.resources.IProject">
+                           <test property="org.eclipse.core.resources.open" value="open" />
+                        </adapt>
+                     </iterate>
+                  </with>
+               </visibleWhen>
             </command>
          </menu>
       </menuContribution>
    </extension>
-</plugin>
+</plugin>