1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package android.service.autofill; 17 18 import android.annotation.NonNull; 19 20 import com.android.internal.util.Preconditions; 21 22 /** 23 * Factory for {@link Validator} operations. 24 * 25 * <p>See {@link SaveInfo.Builder#setValidator(Validator)} for examples. 26 */ 27 public final class Validators { 28 29 private Validators() { 30 throw new UnsupportedOperationException("contains static methods only"); 31 } 32 33 /** 34 * Creates a validator that is only valid if all {@code validators} are valid. 35 * 36 * @throws IllegalArgumentException if any element of {@code validators} is an instance of a 37 * class that is not provided by the Android System. 38 */ 39 @NonNull 40 public static Validator and(@NonNull Validator...validators) { 41 return new RequiredValidators(getInternalValidators(validators)); 42 } 43 44 /** 45 * Creates a validator that is valid if any of the {@code validators} is valid. 46 * 47 * @throws IllegalArgumentException if any element of {@code validators} is an instance of a 48 * class that is not provided by the Android System. 49 */ 50 @NonNull 51 public static Validator or(@NonNull Validator...validators) { 52 return new OptionalValidators(getInternalValidators(validators)); 53 } 54 55 private static InternalValidator[] getInternalValidators(Validator[] validators) { 56 Preconditions.checkArrayElementsNotNull(validators, "validators"); 57 58 final InternalValidator[] internals = new InternalValidator[validators.length]; 59 60 for (int i = 0; i < validators.length; i++) { 61 Preconditions.checkArgument((validators[i] instanceof InternalValidator), 62 "element " + i + " not provided by Android System: " + validators[i]); 63 internals[i] = (InternalValidator) validators[i]; 64 } 65 return internals; 66 } 67 } 68
