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

    assertEquals("someone", icache3.getName());
    assertEquals(0, icache3.getCapacity());      
  }
  public void testCustomizationsOnProductComponentShouldOverrideFactoryParameter(){
    final Container yan = createYanContainer();
    final Component mycache = 
      Components.ctor(MyCache.class,
          new Class[]{String.class, int.class})
      .withArgument(1, Components.value(100));
    
    final Component factory = 
      mycache.factory(ICacheFactory.class);
    yan.registerComponent("target", factory);
    final ICacheFactory ifactory = 
      (ICacheFactory)yan.getInstance("target");
    final tests.jfun.yan.testmodel.ICache icache = ifactory.createCache("tom", 10);

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    assertEquals(100, icache3.getCapacity());      
  }
  public void testLocalCustomizationOverridesFactoryParametersRedirectedToPropeties()
  throws Exception{
    final Container yan = createYanContainer();
    final Component mycache = 
      Components.bean(MyCache.class)
      //.withProperty("name", Components.value("should not see me"))
      .withProperty("name", 
          Components.useProperty(MyCache.class, "capacity", int.class)
          .map(new jfun.yan.Map(){
            public Object map(Object obj){
              return obj.toString();
            }
          }).cast(String.class)
      )
      .withProperty("name", Components.value("should not see me"))
      ;
    
    final Component factory = 
      Components.fromArguments(mycache, new String[]{"name","capacity"})
      .factory(ICacheFactory.class);
    yan.registerComponent("target", factory);
    final ICacheFactory ifactory = 
      (ICacheFactory)yan.getInstance("target");

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    assertEquals(0, icache3.getCapacity());      
  }
  public void testFactoryWithParametersRedirectedToPropeties()
  throws Exception{
    final Container yan = createYanContainer();
    final Component mycache = 
      Components.bean(MyCache.class);
    
    final Component factory = 
      Components.fromArguments(mycache, new String[]{"name","capacity"})
      .factory(ICacheFactory.class);
    yan.registerComponent("target", factory);
    final ICacheFactory ifactory = 
      (ICacheFactory)yan.getInstance("target");

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    assertEquals(0, icache3.getCapacity());      
  }
  public void testFactoryWithParametersRedirectedToPropertiesThenRedirectedBackToArguments()
  throws Exception{
    final Container yan = createYanContainer();
    final Component mycache = 
      Components.ctor(MyCache.class, new Class[]{String.class, int.class})
      .fromProperties(new String[]{"name","capacity"});
    
    final Component factory = 
      mycache.fromArguments(new String[]{"name","capacity"})
      .factory(ICacheFactory.class);
    yan.registerComponent("target", factory);
    final ICacheFactory ifactory = 
      (ICacheFactory)yan.getInstance("target");

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    assertEquals(0, icache3.getCapacity());      
  }
  public void testFactoryWithBadParameterSequence()
  throws Exception{
    final Container yan = createYanContainer();
    final Component mycache = 
      Components.ctor(MyCache.class,
          new Class[]{String.class, int.class});
    
    final Component factory = 
      mycache.factory(ICacheFactory2.class);
    yan.registerComponent("target", factory);
    try{
      yan.verify();
      fail("should have failed with ParameterTypeMismatchException");

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      assertEquals(int.class, e.getActualType());
    }
  }
  public void testFactoryWithBadReturnType(){
    final Container yan = createYanContainer();
    final Component mycache = 
      Components.ctor(MyCache.class,
          new Class[]{String.class, int.class});
    
    final Component factory = 
      mycache.factory(tests.jfun.yan.testmodel.IMonitoredCacheFactory.class);
    yan.registerComponent("target", factory);
    try{
      yan.verify();
      fail("should have failed with ReturnTypeMismatchException");

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      assertEquals(MyCache.class, e.getActualType());
    }
  }
  public void testSealedComponent(){
    final Container yan = createYanContainer();
    final Component c1 = Components.ctor(java.util.ArrayList.class, new Class[]{int.class});
    yan.registerComponent("list", c1.seal());
    yan.registerValue(new Integer(10));
    try{
      yan.getInstance("list");
      fail ("should have failed with IrresolveableArgumentException");
    }
    catch(IrresolveableArgumentException e){}
    yan.registerComponent("list", c1.seal().withArgument(0, Components.value(5)));
    yan.getInstance("list");
    //fail ("should have failed with IrresolveableArgumentException");


    yan.registerComponent("list", c1);
    yan.registerComponent("target", Components.useKey("list").seal()
        .withArgument(0, Components.value(12)));
    //try{
      yan.getInstance("target");
      //fail("should have failed with IrresolveableArgumentException");
    //}
    //catch(IrresolveableArgumentException e){}
    //assertEquals(10, result.size());
    yan.registerComponent("list", c1.withArgument(0, 
        Components.useArgument(Functions.ctor(
            ArrayList.class, new Class[]{int.class}), 0, int.class)));
    yan.registerComponent("target", Components.useKey("list").seal()
        .withArgument(0, Components.value(12)));
    //try{
      yan.getInstance("target");
      //fail("should have failed with IrresolveableArgumentException");
    //}
    //catch(IrresolveableArgumentException e){}
    yan.registerComponent("list", c1.withArgument(0, Components.useType(int.class)));
    yan.registerComponent("target", Components.useKey("list").seal()
        .withArgument(0, Components.value(12)));
    final java.util.ArrayList result = (ArrayList)yan.getInstance("target");
    final Component array = Components.ctor(String[].class);
    
    
    yan.registerComponent("array", array.withArgument(0, Components.useType(int.class)));
    yan.registerComponent("target", Components.useKey("array").seal()
        .withArgument(0, Components.value(12)));
    final String[] arr = (String[])yan.getInstance("target");
    assertEquals(10, arr.length);
    final Component array2 = Components.ctor(int[].class, new Class[]{int.class});
    yan.registerComponent("array", array2.withArgument(0, Components.useType(int.class)));
    yan.registerComponent("target", Components.useKey("array").seal()
        .withArgument(0, Components.value(12)));
    final int[] arr2 = (int[])yan.getInstance("target");
    assertEquals(10, arr2.length);
    try{

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    xFire = fire;
  }




  public Component eval() throws IntrospectionException {
    /**
     * Use the ServiceInterface if that is set, otherwise use the Class of 
     * the service object.
     */
    final Component cc = super.getComponent();
    Class impltype = getImplementationClass();
    if(impltype==null){
      if(cc!=null){
        impltype = cc.getType();
      }
    }
    Class intf = getServiceClass();
    if (intf == null)
    {

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  }
  /**
   * Get the Component for the actual servant.
   */
  public Component getServant(){
    final Component cc = getComponent();
    if(cc!=null) return cc;
    if(this.implementationClass != null)
      return Components.ctor(this.implementationClass);
    if(this.serviceInterface != null)
      return Components.ctor(this.serviceInterface);

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    ServiceBuilder add(String key, Object val){
      props.put(key, toComponent(val));
      return this;
    }
    Component getResult()throws IntrospectionException{
      final Component c = Components.bean(ServiceBean.class)
        .withProperties(props).map(new jfun.yan.Map(){
          public Object map(Object bean){
            return ((ServiceBean)bean).buildService();
          }
        });
      if(getId()==null && isGloballyDefined()){
        //instantiate it using "name".
        registerEagerInstantiation(c);
        return c;
      }
      else
        return c.cast(Service.class);
    }

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