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/*
 * Copyright Google Inc.
 *
 * Licensed 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 com.google.android.gcm.server;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * Result of a GCM multicast message request .
 */
public final class MulticastResult implements Serializable {

  private final int success;
  private final int failure;
  private final int canonicalIds;
  private final long multicastId;
  private final List results;
  private final List retryMulticastIds;

  public static final class Builder {

    private final List results = new ArrayList();

    // required parameters
    private final int success;
    private final int failure;
    private final int canonicalIds;
    private final long multicastId;

    // optional parameters
    private List retryMulticastIds;

    public Builder(int success, int failure, int canonicalIds,
        long multicastId) {
      this.success = success;
      this.failure = failure;
      this.canonicalIds = canonicalIds;
      this.multicastId = multicastId;
    }

    public Builder addResult(Result result) {
      results.add(result);
      return this;
    }

    public Builder retryMulticastIds(List retryMulticastIds) {
      this.retryMulticastIds = retryMulticastIds;
      return this;
    }

    public MulticastResult build() {
      return new MulticastResult(this);
    }
  }

  private MulticastResult(Builder builder) {
    success = builder.success;
    failure = builder.failure;
    canonicalIds = builder.canonicalIds;
    multicastId = builder.multicastId;
    results = Collections.unmodifiableList(builder.results);
    List tmpList = builder.retryMulticastIds;
    if (tmpList == null) {
      tmpList = Collections.emptyList();
    }
    retryMulticastIds = Collections.unmodifiableList(tmpList);
  }

  /**
   * Gets the multicast id.
   */
  public long getMulticastId() {
    return multicastId;
  }

  /**
   * Gets the number of successful messages.
   */
  public int getSuccess() {
    return success;
  }

  /**
   * Gets the total number of messages sent, regardless of the status.
   */
  public int getTotal() {
    return success + failure;
  }

  /**
   * Gets the number of failed messages.
   */
  public int getFailure() {
    return failure;
  }

  /**
   * Gets the number of successful messages that also returned a canonical
   * registration id.
   */
  public int getCanonicalIds() {
    return canonicalIds;
  }

  /**
   * Gets the results of each individual message, which is immutable.
   */
  public List getResults() {
    return results;
  }

  /**
   * Gets additional ids if more than one multicast message was sent.
   */
  public List getRetryMulticastIds() {
    return retryMulticastIds;
  }

  @Override
  public String toString() {
    StringBuilder builder = new StringBuilder("MulticastResult(")
        .append("multicast_id=").append(multicastId).append(",")
        .append("total=").append(getTotal()).append(",")
        .append("success=").append(success).append(",")
        .append("failure=").append(failure).append(",")
        .append("canonical_ids=").append(canonicalIds).append(",");
    if (!results.isEmpty()) {
      builder.append("results: " + results);
    }
    return builder.toString();
  }

}