package sk.stuba.fiit.perconik.core.persistence.data;

import javax.annotation.Nullable;

import sk.stuba.fiit.perconik.core.Registrable;
import sk.stuba.fiit.perconik.core.Resources;
import sk.stuba.fiit.perconik.core.persistence.ResourceRegistration;
import sk.stuba.fiit.perconik.core.services.Services;

/**
 * An abstract implementation of the {@link ResourceRegistration} interface.
 * Implemented predicates like the current registration status are obtained
 * directly from the core using the underlying resource or resource's data.
 *
 * @author Pavol Zbell
 * @since 1.0
 */
public abstract class AbstractResourceRegistration extends AbstractAnnotableRegistration implements ResourceRegistration {
  /**
   * Constructor for use by subclasses.
   */
  protected AbstractResourceRegistration() {}

  @Override
  final Registrable registrable() {
    return this.getResource();
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public final boolean equals(@Nullable final Object o) {
    if (this == o) {
      return true;
    }

    if (!(o instanceof ResourceRegistration)) {
      return false;
    }

    ResourceRegistration other = (ResourceRegistration) o;

    return this.getListenerType() == other.getListenerType() && this.getResourceName().equals(other.getResourceName());
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public final int hashCode() {
    return 31 * (31 + this.getListenerType().hashCode()) + this.getResourceName().hashCode();
  }

  @Override
  public final String toString() {
    return Utilities.toString(this);
  }

  /**
   * {@inheritDoc}
   */
  public final boolean isRegistered() {
    return Resources.isRegistered(this.getListenerType(), this.getResource());
  }

  /**
   * {@inheritDoc}
   */
  public final boolean isProvided() {
    return Services.getResourceService().getResourceProvider().names().contains(this.getResourceName());
  }
}