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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 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 java.util.Objects;
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 = Objects.requireNonNull(id);
mRegex = Objects.requireNonNull(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, android.view.autofill.AutofillId.class),
(Pattern) parcel.readSerializable(java.util.regex.Pattern.class.getClassLoader(), java.util.regex.Pattern.class));
}
@Override
public RegexValidator[] newArray(int size) {
return new RegexValidator[size];
}
};
}
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