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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 android.os.Parcel;
import android.os.Parcelable;
import android.view.autofill.AutofillValue;
/**
* Helper used to calculate the classification score between an actual {@link AutofillValue} filled
* by the user and the expected value predicted by an autofill service.
*/
// TODO(b/70291841): explain algorithm once it's fully implemented
public final class EditDistanceScorer extends InternalScorer implements Scorer, Parcelable {
private static final EditDistanceScorer sInstance = new EditDistanceScorer();
/**
* Gets the singleton instance.
*/
public static EditDistanceScorer getInstance() {
return sInstance;
}
private EditDistanceScorer() {
}
/** @hide */
@Override
public float getScore(@NonNull AutofillValue actualValue, @NonNull String userData) {
if (actualValue == null || !actualValue.isText() || userData == null) return 0;
// TODO(b/70291841): implement edit distance - currently it's returning either 0, 100%, or
// partial match when number of chars match
final String textValue = actualValue.getTextValue().toString();
final int total = textValue.length();
if (total != userData.length()) return 0F;
int matches = 0;
for (int i = 0; i < total; i++) {
if (Character.toLowerCase(textValue.charAt(i)) == Character
.toLowerCase(userData.charAt(i))) {
matches++;
}
}
return ((float) matches) / total;
}
/////////////////////////////////////
// Object "contract" methods. //
/////////////////////////////////////
@Override
public String toString() {
return "EditDistanceScorer";
}
/////////////////////////////////////
// Parcelable "contract" methods. //
/////////////////////////////////////
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel parcel, int flags) {
// Do nothing
}
public static final Parcelable.Creator<EditDistanceScorer> CREATOR =
new Parcelable.Creator<EditDistanceScorer>() {
@Override
public EditDistanceScorer createFromParcel(Parcel parcel) {
return EditDistanceScorer.getInstance();
}
@Override
public EditDistanceScorer[] newArray(int size) {
return new EditDistanceScorer[size];
}
};
}
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