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 android.view.autofill;
  
  import android.annotation.NonNull;
  import android.annotation.Nullable;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Set;
  
  /** @hide */
  public final class Helper {
  
      // Debug-level flags are defined when service is bound.
      public static boolean sDebug = false;
      public static boolean sVerbose = false;
  
      /**
       * Appends {@code value} to the {@code builder} redacting its contents.
       */
      public static void appendRedacted(@NonNull StringBuilder builder,
              @Nullable CharSequence value) {
          builder.append(getRedacted(value));
      }
  
      /**
       * Gets the redacted version of a value.
       */
      @NonNull
      public static String getRedacted(@Nullable CharSequence value) {
          return (value == null) ? "null" : value.length() + "_chars";
      }
  
      /**
       * Appends {@code values} to the {@code builder} redacting its contents.
       */
      public static void appendRedacted(@NonNull StringBuilder builder, @Nullable String[] values) {
          if (values == null) {
              builder.append("N/A");
              return;
          }
          builder.append("[");
          for (String value : values) {
              builder.append(" '");
              appendRedacted(builder, value);
              builder.append("'");
          }
          builder.append(" ]");
      }
  
      /**
       * Converts a collaction of {@link AutofillId AutofillIds} to an array.
       *
       * @param collection The collection.
       * @return The array.
       */
      public static @NonNull AutofillId[] toArray(Collection<AutofillId> collection) {
          if (collection == null) {
              return new AutofillId[0];
          }
          final AutofillId[] array = new AutofillId[collection.size()];
          collection.toArray(array);
          return array;
      }
  
      /**
       * Converts a Set to a List.
       */
      @Nullable
      public static <T> ArrayList<T> toList(@Nullable Set<T> set) {
          return set == null ? null : new ArrayList<T>(set);
      }
  
      private Helper() {
          throw new UnsupportedOperationException("contains static members only");
      }
  }
  