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/*
* 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 android.annotation.NonNull;
import com.android.internal.util.Preconditions;
/**
* Factory for {@link Validator} operations.
*
* <p>See {@link SaveInfo.Builder#setValidator(Validator)} for examples.
*/
public final class Validators {
private Validators() {
throw new UnsupportedOperationException("contains static methods only");
}
/**
* Creates a validator that is only valid if all {@code validators} are valid.
*
* <p>Used to represent an {@code AND} boolean operation in a chain of validators.
*
* @throws IllegalArgumentException if any element of {@code validators} is an instance of a
* class that is not provided by the Android System.
*/
@NonNull
public static Validator and(@NonNull Validator...validators) {
return new RequiredValidators(getInternalValidators(validators));
}
/**
* Creates a validator that is valid if any of the {@code validators} is valid.
*
* <p>Used to represent an {@code OR} boolean operation in a chain of validators.
*
* @throws IllegalArgumentException if any element of {@code validators} is an instance of a
* class that is not provided by the Android System.
*/
@NonNull
public static Validator or(@NonNull Validator...validators) {
return new OptionalValidators(getInternalValidators(validators));
}
/**
* Creates a validator that is valid when {@code validator} is not, and vice versa.
*
* <p>Used to represent a {@code NOT} boolean operation in a chain of validators.
*
* @throws IllegalArgumentException if {@code validator} is an instance of a class that is not
* provided by the Android System.
*/
@NonNull
public static Validator not(@NonNull Validator validator) {
Preconditions.checkArgument(validator instanceof InternalValidator,
"validator not provided by Android System: " + validator);
return new NegationValidator((InternalValidator) validator);
}
private static InternalValidator[] getInternalValidators(Validator[] validators) {
Preconditions.checkArrayElementsNotNull(validators, "validators");
final InternalValidator[] internals = new InternalValidator[validators.length];
for (int i = 0; i < validators.length; i++) {
Preconditions.checkArgument((validators[i] instanceof InternalValidator),
"element " + i + " not provided by Android System: " + validators[i]);
internals[i] = (InternalValidator) validators[i];
}
return internals;
}
}
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