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package com.sun.hk2.jsr330.spi.internal;

import java.lang.reflect.Constructor;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;

import javax.inject.Inject;
import javax.inject.Provider;

import org.jvnet.hk2.component.ComponentException;
import org.jvnet.hk2.component.Habitat;
import org.jvnet.hk2.component.Inhabitant;
import org.jvnet.hk2.component.InjectionManager;
import org.jvnet.hk2.component.MultiMap;
import org.jvnet.tiger_types.Types;

import com.sun.hk2.component.ConstructorWomb;

/**
 * Jsr30 requires injection resolution for ctor(s)
 * 
 * @author Jeff Trent
 *
 * @since 3.1
 */
@SuppressWarnings("unchecked")
public class Jsr330ConstructorWomb extends ConstructorWomb {

  public Jsr330ConstructorWomb(
      Class type,
      Habitat habitat,
      MultiMap metadata) {
    super(type, habitat, metadata);
  }

  @Override
  protected InjectionManager createInjectionManager() {
    return new Jsr330InjectionManager();
  }


  /**
   * First attempts to newInstance() as normal, then fails over to looking for @Inject ctor(s)
   */
  @Override
  public T create(Inhabitant onBehalfOf) throws ComponentException {
    try {
      return type.newInstance();
    } catch (IllegalAccessException e) {
      return createFromInjectedCtor();
    } catch (InstantiationException e) {
      return createFromInjectedCtor();
    } catch (Exception e) {
      throw new ComponentException("Failed to create " + type, e);
    }
  }

  protected T createFromInjectedCtor() {
    List params = null;
    try {
      Constructor ctor = getConstructor();
      ctor.setAccessible(true);

      params = getParameters(ctor);
      return ctor.newInstance(params.toArray());
    } catch (Exception e) {
      e.printStackTrace();
      throw new ComponentException("Failed to create " + type, e);
    }
  }

  /**
   * Determine the constructor to use.
   */
  protected Constructor getConstructor() throws Exception {
    for (Constructor ctor : type.getDeclaredConstructors()) {
      Inject inject = (Inject) ctor.getAnnotation(Inject.class);
      if (null != inject) {
        return ctor;
      }
    }
    
    Constructor ctor = type.getDeclaredConstructor((Class[])null);
    if (null != ctor) {
      return ctor;
    }
    
    throw new ComponentException("no appropriate constructor");
  }

  /**
   * Resolve the parameters for the selected ctor
   */
  protected List getParameters(Constructor ctor) {
    ArrayList params = new ArrayList();
    
    for (Type paramType : ctor.getGenericParameterTypes()) {
      Class paramClass = Types.erasure(paramType);

      Object val;
      if (Types.isSubClassOf(paramClass, Provider.class)) {
        val = Jsr330InjectionResolver.getHolderInjectValue(habitat, ctor, null, paramType);
      } else {
        val = Jsr330InjectionResolver.get(habitat, ctor, ctor, paramClass);
      }
      
      params.add(val);
    }
    
    return params;
  }

  @Override
  public void initialize(final T t, final Inhabitant onBehalfOf) throws ComponentException {
    super.initialize(t, onBehalfOf);
  }

}