Response.java

package redis.clients.jedis;

import redis.clients.jedis.exceptions.JedisDataException;

public class Response<T> {
  protected T response = null;
  private boolean built = false;
  private boolean set = false;
  private Builder<T> builder;
  private Object data;
  private Response<?> dependency = null;
  private boolean requestDependencyBuild = false;

  public Response(Builder<T> b) {
    this.builder = b;
  }

  public void set(Object data) {
    this.data = data;
    set = true;
  }

  public T get() {
    // if response has dependency response and dependency is not built,
    // build it first and no more!!
    if (!requestDependencyBuild && dependency != null && dependency.set && !dependency.built) {
      requestDependencyBuild = true;
      dependency.build();
    }
    if (!set) {
      throw new JedisDataException(
          "Please close pipeline or multi block before calling this method.");
    }
    if (!built) {
      build();
    }
    return response;
  }

  public void setDependency(Response<?> dependency) {
    this.dependency = dependency;
    this.requestDependencyBuild = false;
  }

  private void build() {
    if (data != null) {
      if (data instanceof JedisDataException) {
        throw new JedisDataException((JedisDataException) data);
      }
      response = builder.build(data);
    }
    data = null;
    built = true;
  }

  public String toString() {
    return "Response " + builder.toString();
  }

}