Examples of jfun.yan.Component

jfun.yan.Component
Responsible for component instance creation and verification.
Component is immutable. All update functions such as the ones started with "with" are functional-update, which means a new Component object is created to reflect the change, while the state of the old object remains the same.

Component is the core of Yan in the sense that most customizations of instance creation strategy can be done by combining existing Component objects.

This is called a "combinator" approach where complex components can be constructed by combining simpler components who may be combinations of yet simpler components.

Common combinators are included in this class to make the syntax simpler for combining components. For example:
comp1.withArguments(args) rather than Components.withArguments(comp1, args)
Codehaus.org. @author Ben Yu @see Components @see jfun.yan.Monad

    this.echo = echo;
  }


  public Component eval() {
    // TODO Auto-generated method stub
    final Component r = super.eval();
    if(echo){
      final String msg = (String)this.getNutEnvironment().findService("echo_msg");
      if(msg == null)
        throw raise("echo_msg not found.");
      return r.mutate(new Mutation(){
        public void mutate(Object r){
          System.out.println(msg + r +" constructed.");
        }
      });
    }

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  }


  public Component eval(){
    final List keys = getKeys();
    final Component[] vals = getEntryComponents();
    final Component step1 = new SimpleComponent(Properties.class){
      public Object create(){
        return new Properties();
      }
    };
    return Components.storeMap(step1, keys.toArray(), vals);

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  public Component eval(){
    final Component[] elements = getMandatoryElements();
    final Class type = getType(Object[].class);
    final Class oftype = getOf();
    final Class etype = oftype==null?Object.class:oftype;
    final Component step1 = new SimpleComponent(type){
      public Object create(){
        return Array.newInstance(etype, elements.length);
      }
      public String toString(){
        return StringUtils.listArray("[",",","]",elements);

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          assertEquals(cc, cc);
          if(cc!=null)
            assertFalse(cc.equals(null));
          final HashMap hmap = new HashMap();
          hmap.put(cc, cc);
          final Component cc1 = (Component)hmap.get(cc);
          assertEquals(cc, cc1);
          assertEquals(""+cc, ""+cc1);
        }
      };
    }

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       yan.unregisterComponentsOfType(Integer.class);
     }
     yan.unregisterComponent("superman");
     yan.unregisterComponent("supermanref");
     yan.unregisterComponent("badsupermanref");
     final Component anonymous_person = Components.bean(
         Components.method(this, "newPerson"),
         new String[]{"name","age"}
     )
     .withProperty("name", Components.useKey("personName"))
     .withProperty("age", Components.useType(Integer.class));
     
     yan.registerComponent(anonymous_person);
     final Component bad_person =          Components.bean(
         Components.value(null).subsume(Person.class),
         new String[]{"name","age"}
     )
     .withProperty("name", Components.useKey("personName"))
     .withProperty("age", Components.useType(Integer.class));

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      assertEquals("target arrived!", yan.getInstance("target"));
    }
    public void testLifeycles()
    throws Throwable{
      final Container yan = new DefaultContainer();
      final Component real_engine = 
        Components.useKey("real engine").singleton(new ThreadLocalScope());
      final DefaultLifecycleDescriptor desc = new DefaultLifecycleDescriptor();
      desc.setCloser(new Phase(desc.getCloser().getPhaseKey(), ExceptionHandlers.suppresser()));
      desc.setStopper(new Phase(desc.getStopper().getPhaseKey(), ExceptionHandlers.suppresser()));
      final DefaultLifecycleManager lm = new DefaultLifecycleManager(desc);
      final DefaultLifecycleManager.DefaultLifecycle lc = lm.newLifecycle()
      .starter("start")
      .stopper("stop")
      .initializer("initialize")
      .disposer("destroy");
      final Component engine_lc = lc.manage(real_engine);
      yan.registerComponent(CarEngine.class, engine_lc);
      /*
      yan.registerComponent(CarEngine.class, LifecycleDescriptor.instance(
          Components.useKey("real engine").singleton(new ThreadLocalScope()), 
          ExceptionHandlers.suppresser())
          .starter("start")
          .stopper("stop")
          .initializer("initialize")
          .disposer("destroy")
          .get());
      */
      yan.registerConstructor("real engine", CarEngine.class);
      final Component sttfrc = Components.ctor(StatefulResource.class)
      .withArgument(0, Components.useType(CarEngine.class));
      yan.registerComponent(lc.manage(sttfrc));
      /*
      yan.registerComponent(LifecycleDescriptor.instance(
          Components.ctor(StatefulResource.class)
          .withArgument(0, Components.useType(CarEngine.class))
          , ExceptionHandlers.suppresser())
          .initializer("initialize")
          .disposer("destroy")
          .starter("start")
          .stopper("stop")
          .get());
      */
      final Component car_engine = yan.getComponentOfType(CarEngine.class);
      assertNull(car_engine.getType());
      
      final StatefulResource resource = (StatefulResource)yan.getInstanceOfType(StatefulResource.class);
      final CarEngine engine = (CarEngine)yan.getInstanceOfType(CarEngine.class);
      assertEquals(0, engine.getStarted());
      assertEquals(0, engine.getStopped());

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      c = c.field(parts[i].trim(), private_access);
    }
    return c;
  }
  public Component eval(){
    final Component cc = getComponent();
    checkMandatory("class", hostclass, "component", cc);
    checkMandatory("name", fldname);
    return getFieldComponent(hostclass, cc, fldname, private_access);
    /*
    if(hostclass != null){

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        }
      });
    }


    Component custProperties(Component c, String[] givers){
      Component r = c;
      for(int i=0;i<givers.length;i++){
        r = custProperty(r, givers[i]);
      }
      return r;
    }

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    }
    public void testComponentArgumentsShouldNotPropogateToParts(){
      final Container yan = createYanContainer();
      yan.registerValue("default prefix");
      yan.registerComponent(Components.value(1));
      final Component tag = Components.method(this, "tag");
      final Component target = tag
        .withArgument(0, Components.method(this, "tag"))
        .withArgument(1, Components.value(0));
      yan.registerComponent("target", target);
      final Object result = yan.getInstance("target");
      assertEquals("default prefix10", ""+result);

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      yan.registerComponent("target", target);
      final Object result = yan.getInstance("target");
      assertEquals("default prefix10", ""+result);
    }
    public void testUsePropertyCannotBeAppliedToTopLevel(){
      final Component use1 = Components.useProperty(String.class, "prop1", String.class)
        .withProperty("prop1", Components.value("hello"));
      final Container yan = createYanContainer();
      yan.registerComponent("target", use1);
      try{
        yan.verify();

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