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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 */
package org.apache.shindig.protocol;

import com.google.common.base.Objects;

/**
 * Represents the response items that get handed back as json within the
 * DataResponse.
 */
public final class ResponseItem {
  /**
   * The error code associated with the item.
   */
  private final int errorCode;

  /**
   * The error message.
   */
  private final String errorMessage;

  /**
   * The response value.
   */
  private final Object response;

  /**
   * Create a ResponseItem specifying the ResponseError and error Message.
   * @param errorCode an RPC error code
   * @param errorMessage the Error Message
   */
  public ResponseItem(int errorCode, String errorMessage) {
    this(errorCode, errorMessage, null);
  }

  /**
   * Create a ResponseItem specifying the ResponseError and error Message.
   * @param errorCode an RPC error code
   * @param errorMessage the Error Message
   * @param response the application specific value that will be sent as
   *     as part of "data" section of the error.
   */
  public ResponseItem(int errorCode, String errorMessage, Object response) {
    this.errorCode = errorCode;
    this.errorMessage = errorMessage;
    this.response = response;
  }

  /**
   * Create a ResponseItem specifying a value.
   */
  public ResponseItem(Object response) {
    this.errorCode = 200;
    this.errorMessage = null;
    this.response = response;
  }

  /**
   * Get the response value.
   */
  public Object getResponse() {
    return response;
  }

  /**
   * Get the error code associated with this ResponseItem.
   * @return the error code associated with this ResponseItem
   */
  public int getErrorCode() {
    return errorCode;
  }

  /**
   * Get the Error Message associated with this Response Item.
   * @return the Error Message
   */
  public String getErrorMessage() {
    return errorMessage;
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }

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

    ResponseItem that = (ResponseItem) o;
    return (errorCode == that.errorCode)
        && Objects.equal(errorMessage, that.errorMessage)
        && Objects.equal(response, that.response);
  }

  @Override
  public int hashCode() {
    return Objects.hashCode(errorCode, errorMessage, response);
  }
}