content: /*
   * Copyright (C) 2017 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.service.autofill;
  
  import static android.view.autofill.Helper.sDebug;
  
  import android.annotation.NonNull;
  import android.annotation.TestApi;
  import android.os.Parcel;
  import android.os.Parcelable;
  import android.util.Log;
  import android.view.autofill.AutofillId;
  
  import com.android.internal.util.Preconditions;
  
  import java.util.regex.Pattern;
  
  /**
   * Defines if a field is valid based on a regular expression (regex).
   *
   * <p>See {@link SaveInfo.Builder#setValidator(Validator)} for examples.
   */
  public final class RegexValidator extends InternalValidator implements Validator, Parcelable {
  
      private static final String TAG = "RegexValidator";
  
      private final AutofillId mId;
      private final Pattern mRegex;
  
      /**
       * Default constructor.
       *
       * @param id id of the field whose regex is applied to.
       * @param regex regular expression that defines the result of the validator: if the regex
       * matches the contents of the field identified by {@code id}, it returns {@code true};
       * otherwise, it returns {@code false}.
        */
      public RegexValidator(@NonNull AutofillId id, @NonNull Pattern regex) {
          mId = Preconditions.checkNotNull(id);
          mRegex = Preconditions.checkNotNull(regex);
      }
  
      /** @hide */
      @Override
      @TestApi
      public boolean isValid(@NonNull ValueFinder finder) {
          final String value = finder.findByAutofillId(mId);
          if (value == null) {
              Log.w(TAG, "No view for id " + mId);
              return false;
          }
  
          final boolean valid = mRegex.matcher(value).matches();
          if (sDebug) Log.d(TAG, "isValid(): " + valid);
          return valid;
      }
  
      /////////////////////////////////////
      // Object "contract" methods. //
      /////////////////////////////////////
      @Override
      public String toString() {
          if (!sDebug) return super.toString();
  
          return "RegexValidator: [id=" + mId + ", regex=" + mRegex + "]";
      }
  
      /////////////////////////////////////
      // Parcelable "contract" methods. //
      /////////////////////////////////////
      @Override
      public int describeContents() {
          return 0;
      }
  
      @Override
      public void writeToParcel(Parcel parcel, int flags) {
          parcel.writeParcelable(mId, flags);
          parcel.writeSerializable(mRegex);
      }
  
      public static final @android.annotation.NonNull Parcelable.Creator<RegexValidator> CREATOR =
              new Parcelable.Creator<RegexValidator>() {
          @Override
          public RegexValidator createFromParcel(Parcel parcel) {
              return new RegexValidator(parcel.readParcelable(null),
                      (Pattern) parcel.readSerializable());
          }
  
          @Override
          public RegexValidator[] newArray(int size) {
              return new RegexValidator[size];
          }
      };
  }
  