code: /*
   * Copyright 2015 Google Inc. All rights reserved.
   *
   * 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 org.physical_web.collection;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.Comparator;
  import java.util.List;
  
  /**
   * A collection of similar URLs, the devices broadcasting those URLs, and associated metadata.
   */
  public class UrlGroup {
    private String mGroupId;
    private List<PwPair> mPwPairs;
  
    /**
     * Construct a UrlGroup.
     * @param groupId The URL group ID of this group.
     */
    public UrlGroup(String groupId) {
      mGroupId = groupId;
      mPwPairs = new ArrayList<PwPair>();
    }
  
    /**
     * Gets the group ID for this group.
     * @return Group ID
     */
    public String getGroupId() {
      return mGroupId;
    }
  
    /**
     * Add a PwPair to this group.
     * @param pwPair The PwPair to add.
     */
    public void addPair(PwPair pwPair) {
      mPwPairs.add(pwPair);
    }
  
    /**
     * Get the top-ranked PwPair in this group.
     * @return The top PwPair.
     */
    public PwPair getTopPair(Comparator<PwPair> comparator) {
      Collections.sort(mPwPairs, comparator);
      return mPwPairs.get(0);
    }
  }
  