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package io.ebeaninternal.server.deploy;

import io.ebean.event.BeanPostLoad;

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

/**
 * Handles multiple BeanPostLoad's for a given entity type.
 */
public final class ChainedBeanPostLoad implements BeanPostLoad {

  private final List list;
  private final BeanPostLoad[] chain;

  /**
   * Construct given the list of BeanPostLoad's.
   */
  public ChainedBeanPostLoad(List list) {
    this.list = list;
    this.chain = list.toArray(new BeanPostLoad[0]);
  }

  /**
   * Register a new BeanPostLoad and return the resulting chain.
   */
  public ChainedBeanPostLoad register(BeanPostLoad c) {
    if (list.contains(c)) {
      return this;
    } else {
      List newList = new ArrayList<>(list);
      newList.add(c);
      return new ChainedBeanPostLoad(newList);
    }
  }

  /**
   * De-register a BeanPostLoad and return the resulting chain.
   */
  public ChainedBeanPostLoad deregister(BeanPostLoad c) {
    if (!list.contains(c)) {
      return this;
    } else {
      List newList = new ArrayList<>(list);
      newList.remove(c);
      return new ChainedBeanPostLoad(newList);
    }
  }

  @Override
  public boolean isRegisterFor(Class cls) {
    // never called
    return false;
  }

  /**
   * Fire postLoad on all registered BeanPostLoad implementations.
   */
  @Override
  public void postLoad(Object bean) {
    for (BeanPostLoad postLoad : chain) {
      postLoad.postLoad(bean);
    }
  }
}