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

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import org.jvnet.hk2.annotations.Inject;
import org.jvnet.hk2.annotations.Service;
import org.jvnet.hk2.component.Habitat;

import com.sun.hk2.jsr330.BasicBinding;
import com.sun.hk2.jsr330.BindingFactory;
import com.sun.hk2.jsr330.Jsr330Binding;
import com.sun.hk2.jsr330.Jsr330Bindings;
import com.sun.hk2.jsr330.spi.Jsr330BindingLocator;

/**
 * Default implementation for the Jsr330BindingLocator.
 * 
 * It builds a list by first calling all {@link Jsr330Bindings},
 * and then finding individual {@link Jsr330Binding}(s) in the system.
 * 
 * @author Jeff Trent
 * 
 * @since 3.1
 */
// TODO: need to implement service ranking in Hk2
@Service(metadata=org.jvnet.hk2.component.Constants.SERVICE_RANKING + "=" + Integer.MIN_VALUE)
public class Jsr330BindingLocatorImpl implements Jsr330BindingLocator, BindingFactory {

  @Inject
  private Habitat h;
  
  /**
   * Will return a list populated with zero or more Jsr330Binding objects. 
   */
  @Override
  public List getAllBindings() {
    ArrayList bindings = new ArrayList();

    Collection producers = h.getAllByContract(Jsr330Bindings.class);
    for (Jsr330Bindings producer : producers) {
      ArrayList subBindings = new ArrayList();
      producer.getBindings(subBindings, this);
      bindings.addAll(subBindings);
    }
    
    Collection floaters = h.getAllByContract(Jsr330Binding.class);
    for (Jsr330Binding binding : floaters) {
      bindings.add(binding);
    }
    
    return bindings;
  }

  @Override
  public BasicBinding newBinding(String serviceName) {
    return new BasicBinding(serviceName);
  }

  @Override
  public BasicBinding newBinding(Class serviceClass) {
    return new BasicBinding(serviceClass);
  }

}