content: /*
   * Copyright (C) 2016 The Android Open Source Project
   *
   * 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.android.launcher3.util;
  
  import java.text.Collator;
  import java.util.Comparator;
  
  /**
   * Extension of {@link java.text.Collator} with special handling for digits. Used for comparing
   * user visible labels.
   */
  public class LabelComparator implements Comparator<String> {
  
      private final Collator mCollator = Collator.getInstance();
  
      @Override
      public int compare(String titleA, String titleB) {
          // Ensure that we de-prioritize any titles that don't start with a
          // linguistic letter or digit
          boolean aStartsWithLetter = (titleA.length() > 0) &&
                  Character.isLetterOrDigit(titleA.codePointAt(0));
          boolean bStartsWithLetter = (titleB.length() > 0) &&
                  Character.isLetterOrDigit(titleB.codePointAt(0));
          if (aStartsWithLetter && !bStartsWithLetter) {
              return -1;
          } else if (!aStartsWithLetter && bStartsWithLetter) {
              return 1;
          }
  
          // Order by the title in the current locale
          return mCollator.compare(titleA, titleB);
      }
  }
  