[picocontainer-dev] Tiering support 4 Pico

I've shoved in a new class org.picocontainer.containers.TieringGuard  
(subject to rename).

And there's a testcase at the bottom of DPCTC  ( http://svn.codehaus.org/picocontainer/java/2.x/trunk/pico/container/src/test/org/picocontainer/DefaultPicoContainerTestCase.java 
  )

     public static class Couch {
     }

     public static class TiredPerson {
         private Couch couchToSitOn;
         public TiredPerson(Couch couchToSitOn) {
             this.couchToSitOn = couchToSitOn;
         }
     }

     @Test public void  
testThatParentTraversalForComponentsCanBeBlocked() {
         DefaultPicoContainer grandparent = new DefaultPicoContainer();
         DefaultPicoContainer parent = (DefaultPicoContainer)  
grandparent.makeChildContainer();
         parent.setTiering(true);
         DefaultPicoContainer child = (DefaultPicoContainer)  
parent.makeChildContainer();
         child.setTiering(true);
         grandparent.addComponent(Couch.class);
         child.addComponent(TiredPerson.class);

         TiredPerson tp = null;
         try {
             tp = child.getComponent(TiredPerson.class);
             fail("should have barfed");
         } catch (AbstractInjector.UnsatisfiableDependenciesException  
e) {
             System.out.println("");
             // expected
         }

     }
The idea is that in a tiered application, you should only depend on  
the classes from the immediate tier below you.
Thus DPC now has a setTiering(boolean) method (subject to rename).
TieringGuard uses a static ThreadLocal to indicate to parents that  
we're traversing towards the root of the container tree to fill deps.
Comments appreciated.
- Paul


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