Extending eclipse plugin : How to enable and disable menu?

Question

I want enable my 2nd and 7th menu if the process for first menu is complete. I want to enable my 3rd and 7th menu if process for 2nd menu is complete and so on. I have seven menu. At very first only first menu should be active and remaining should be disable and at second time if 1st process is complete then only 1st menu, 2nd menu and 7th menu should be enabled.

I am not getting how should I make changes in my plugin.xml in order to work as I am expecting. Here is my plugin.xml code. Please help me and thank you in advance.

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.4"?>
<plugin>
   <extension
         point="org.eclipse.ui.menus">

      <menuContribution
            allPopups="false"
            locationURI="menu:org.eclipse.ui.main.menu?after=additions">
            <menu id = "documentation.handlers.Documentation"
             label = "Documentation">
               <command id="documentation.handlers.SampleHandler" 
               commandId="documentation.handlers.SampleHandler">
                </command>
                <command id="documentation.handlers.SampleHandler1" 
               commandId="documentation.handlers.SampleHandler1">
                </command>
                <command id="documentation.handlers.SampleHandler2" 
               commandId="documentation.handlers.SampleHandler2">
                </command>  
                <command id="documentation.handlers.SampleHandler3" 
               commandId="documentation.handlers.SampleHandler3">
                </command>  
                <command id="documentation.handlers.SampleHandler4" 
               commandId="documentation.handlers.SampleHandler4">
                </command>  
                <command id="documentation.handlers.SampleHandler4" 
               commandId="documentation.handlers.SampleHandler5">
                </command>  
                <command id="documentation.handlers.SampleHandler4" 
               commandId="documentation.handlers.SampleHandler6">
                </command>  
                </menu>
      </menuContribution>
      <menuContribution 
        locationURI="toolbar:org.eclipse.ui.main.toolbar?after=additions">
         <toolbar id="documentation.handlers.sampleToolbar">
         <command id="documentation.handlers.sampleCommand" 
          commandId="documentation.handlers.SampleHandler">
           </command>
           <command id="documentation.handlers.sampleCommand" 
          commandId="documentation.handlers.SampleHandler1">
           </command>
           <command id="documentation.handlers.sampleCommand" 
          commandId="documentation.handlers.SampleHandler2">
           </command>
           <command id="documentation.handlers.sampleCommand" 
          commandId="documentation.handlers.SampleHandler3">
           </command>
          <command id="documentation.handlers.sampleCommand" 
          commandId="documentation.handlers.SampleHandler4">
           </command>
          <command id="documentation.handlers.sampleCommand" 
          commandId="documentation.handlers.SampleHandler5">
           </command>
          <command id="documentation.handlers.sampleCommand" 
          commandId="documentation.handlers.SampleHandler6">
           </command>
          </toolbar>
      </menuContribution>
   </extension>

  <extension
         point="org.eclipse.ui.commands">
      <command
            id="documentation.handlers.SampleHandler"
            name="Project Descritpion">
      </command>
   </extension>
   <extension
         point="org.eclipse.ui.handlers"
         id = "documentation.handlers">
      <handler
            class="documentation.handlers.SampleHandler"
            commandId="documentation.handlers.SampleHandler">
      </handler>
   </extension>

    <extension
         point="org.eclipse.ui.commands">
      <command
            id="documentation.handlers.SampleHandler1"
            name="Fact Finding Techniques">
      </command>
   </extension>
   <extension
         point="org.eclipse.ui.handlers"
         id = "documentation.handlers">
      <handler
            class="documentation.handlers.SampleHandler1"
            commandId="documentation.handlers.SampleHandler1">
      </handler>
   </extension>

   <extension
         point="org.eclipse.ui.commands">
      <command
            id="documentation.handlers.SampleHandler2"
            name="Feasibility Study">
      </command>
   </extension>
   <extension
         point="org.eclipse.ui.handlers"
         id = "documentation.handlers">
      <handler
            class="documentation.handlers.SampleHandler2"
            commandId="documentation.handlers.SampleHandler2">
      </handler>
   </extension>

    <extension
         point="org.eclipse.ui.commands">
      <command
            id="documentation.handlers.SampleHandler3"
            name="Technical Requirement">
      </command>
   </extension>
   <extension
         point="org.eclipse.ui.handlers"
         id = "documentation.handlers">
      <handler
            class="documentation.handlers.SampleHandler3"
            commandId="documentation.handlers.SampleHandler3">
      </handler>
   </extension>

   <extension
         point="org.eclipse.ui.commands">
      <command
            id="documentation.handlers.SampleHandler4"
            name="Open Documentation">
      </command>
   </extension>
   <extension
         point="org.eclipse.ui.handlers"
         id = "documentation.handlers">
      <handler
            class="documentation.handlers.SampleHandler4"
            commandId="documentation.handlers.SampleHandler4">
      </handler>
   </extension>
   <extension
         point="org.eclipse.ui.commands">
      <command
            id="documentation.handlers.SampleHandler5"
            name="UML Diagrams">
      </command>
   </extension>
   <extension
         point="org.eclipse.ui.handlers"
         id = "documentation.handlers">
      <handler
            class="documentation.handlers.SampleHandler5"
            commandId="documentation.handlers.SampleHandler5">
      </handler>
   </extension>
   <extension
         point="org.eclipse.ui.commands">
      <command
            id="documentation.handlers.SampleHandler6"
            name="Database Development">
      </command>
   </extension>
   <extension
         point="org.eclipse.ui.handlers"
         id = "documentation.handlers">
      <handler
            class="documentation.handlers.SampleHandler6"
            commandId="documentation.handlers.SampleHandler6">
      </handler>
   </extension>

</plugin>

Answer 1

You would do this with an enabledWhen expression on the handler for each command. It sounds like you will probably have to use a property tester to define a custom test for the enabled when expression.

Use the org.eclipse.core.expressions.propertyTesters to define a property tester, something like:

<extension point="org.eclipse.core.expressions.propertyTesters">
  <propertyTester
    id="documentation.propertytester"
    type="java.lang.Object"
    namespace="documentation"
    properties="handler1enabled,handler2enabled,handler3enabled.. and so on ..."
    class="documentation.PropertyTester">
  </propertyTester>
</extension>

You then code a documention.PropertyTester class to do the property tests.

You can then use it in your enabled when expression like this:

<handler
        class="documentation.handlers.SampleHandler5"
        commandId="documentation.handlers.SampleHandler5">
     <enabledWhen>
         <test
              property="namespace.handler5enabled">
         </test>
     </enabledWhen>
</handler>