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

        r = r.followedBy(Components.method(v, givers[i])); 
      }
      return r;
    }
    private Verifiable verifyProperties(Class t, String[] givers){
      Component r = Components.value(null).cast(t);
      for(int i=0; i<givers.length; i++){
        r = r.followedBy(
            Components.method(t, null, givers[i])
        ); 
      }
      return r;
    }

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   * Subclass can call this method and apply customized lifecycle.
   */
  protected Component evaluateNoLifecycle(){
    checkMandatory("class", hostclass, "component", cc);
    checkMandatory("name", method_name);
    Component result;
    final Class[] param_types = getParameterTypes();
    if(cc != null){
      if(hostclass != null){
        final Method mtd = lookupMethod(param_types);
        result = cc.method(mtd);

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public class SimpleTestCase extends BaseConfigurationTest {
  public void test1()
  throws Throwable{


    runTest("test/yan/test.xml");
    final Component c = yan.getComponent("service_maker");
    assertNotNull(c);
    final BankAccount acc = new BankAccount("test", 1000000);
    final Component service = 
      c.withArguments(new Component[]{Components.value(acc), Components.value("getBalance")});
    final Integer bal = (Integer)yan.instantiateComponent(service);
    assertEquals(1000000, bal.intValue());
    
    final Component acct_request = yan.getComponent("bankaccount_request");
    final HashMap props = new HashMap();
    props.put("balance", new Integer(6666));
    final Integer result = (Integer)yan.instantiateComponent(
        acct_request.withArgument(0, Components.value(props)));
    assertEquals(6666, result.intValue());
    
    final Component acct_request2 = yan.getComponent("bankaccount_request2");
    final HashMap props2 = new HashMap();
    props.put("balance", new Integer(7777));
    final String result2 = (String)yan.instantiateComponent(
        acct_request2.withArgument(0, Components.value(props2)));
    assertEquals("this is my test", result2);
    
    
  }

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  public Component eval()
  throws IntrospectionException{
    checkMandatory("component", component);
    checkMandatory("name", name);
    Component result = component;
    if(ind < 0){
      result = result.setter(name);
    }
    else{
      result = result.setter(name, ind);
    }
    final Object val = getVal();
    final Object defval = getDefault();
    if(val==null && defval==null){
      return result;
    }
    
    return result.bindArguments(new ParameterBinder(){
      public Creator bind(Signature src, int ind, Class type) {
        if(ind==0){
          Component arg = getVal(type);
          Component def = getDefault(type);
          Component result = arg;
          if(result==null){
            result = Components.useArgument(src, ind, type);
          }
          if(def!=null){
            result = Monad.mplus(result, def);

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   * Subclass can call this method and apply customized lifecycle.
   */
  protected Component evaluateNoLifecycle(){
    checkMandatory("class", type);
    final Constructor ctor = lookupConstructor();
    Component result = Components.fun(Functions.ctor(ctor));
    return decorateComponent(result);
  }

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    this.binder = binder;
  }




  public Component eval(){
    final Component c1 = getMandatory();
    checkMandatory("binder", binder);
    return followup?c1.followedBy(binder):c1.bind(binder);
  }

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    }
  }
  public Component eval(){
    final Component[] elements = getMandatoryElements();
    final Class ltype = getType(HashSet.class);
    final Component step1 = new SimpleComponent(ltype){
      public Object create(){
        return createSet(elements.length);
      }
      public String toString(){
        return "set"+StringUtils.listArray("[",",","]",elements);

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    final int sz = keys.size();
    final Component[] vals = new Component[sz];
    for(int i=0; i<sz; i++){
      final Object key = keys.get(i);
      final MapEntry entry = (MapEntry)components.get(key);
      Component val = entry.getVal(Object.class);
      final Component def = entry.getDefault(Object.class);
      if(def!=null){
        val = Monad.mplus(val, def);
      }
      vals[i] = (of==null)?val:Util.convert(entry, of, val);
    }

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    }
  }
  public Component eval(){
    final Component[] elements = getMandatoryElements();
    final Class ltype = getType(ArrayList.class);
    final Component step1 = new SimpleComponent(ltype){
      public Object create(){
        return createList(elements.length);
      }
      public String toString(){
        return "list"+StringUtils.listArray("[",",","]",elements);

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  public Component eval(){
    checkMandatory("map type", type);
    final List keys = getKeys();
    final int sz = keys.size();
    final Component[] vals = getEntryComponents();
    final Component step1 = new SimpleComponent(type){
      public Object create(){
        return createMap(sz);
      }
    };
    return Components.storeMap(step1, keys.toArray(), vals);

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