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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.os.Parcel;
import android.view.autofill.Helper;
import com.android.internal.util.Preconditions;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
/**
* Represents the <a href="AutofillService.html#FieldClassification">field classification</a>
* results for a given field.
*/
public final class FieldClassification {
private final ArrayList<Match> mMatches;
/** @hide */
public FieldClassification(@NonNull ArrayList<Match> matches) {
mMatches = Preconditions.checkNotNull(matches);
Collections.sort(mMatches, new Comparator<Match>() {
@Override
public int compare(Match o1, Match o2) {
if (o1.mScore > o2.mScore) return -1;
if (o1.mScore < o2.mScore) return 1;
return 0;
}}
);
}
/**
* Gets the {@link Match matches} with the highest {@link Match#getScore() scores} (sorted in
* descending order).
*
* <p><b>Note:</b> There's no guarantee of how many matches will be returned. In fact,
* the Android System might return just the top match to minimize the impact of field
* classification in the device's health.
*/
@NonNull
public List<Match> getMatches() {
return mMatches;
}
@Override
public String toString() {
if (!sDebug) return super.toString();
return "FieldClassification: " + mMatches;
}
private void writeToParcel(Parcel parcel) {
parcel.writeInt(mMatches.size());
for (int i = 0; i < mMatches.size(); i++) {
mMatches.get(i).writeToParcel(parcel);
}
}
private static FieldClassification readFromParcel(Parcel parcel) {
final int size = parcel.readInt();
final ArrayList<Match> matches = new ArrayList<>();
for (int i = 0; i < size; i++) {
matches.add(i, Match.readFromParcel(parcel));
}
return new FieldClassification(matches);
}
static FieldClassification[] readArrayFromParcel(Parcel parcel) {
final int length = parcel.readInt();
final FieldClassification[] fcs = new FieldClassification[length];
for (int i = 0; i < length; i++) {
fcs[i] = readFromParcel(parcel);
}
return fcs;
}
static void writeArrayToParcel(@NonNull Parcel parcel, @NonNull FieldClassification[] fcs) {
parcel.writeInt(fcs.length);
for (int i = 0; i < fcs.length; i++) {
fcs[i].writeToParcel(parcel);
}
}
/**
* Represents the score of a {@link UserData} entry for the field.
*
* <p>The score is defined by {@link #getScore()} and the entry is identified by
* {@link #getRemoteId()}.
*/
public static final class Match {
private final String mRemoteId;
private final float mScore;
/** @hide */
public Match(String remoteId, float score) {
mRemoteId = Preconditions.checkNotNull(remoteId);
mScore = score;
}
/**
* Gets the remote id of the {@link UserData} entry.
*/
@NonNull
public String getRemoteId() {
return mRemoteId;
}
/**
* Gets a classification score for the value of this field compared to the value of the
* {@link UserData} entry.
*
* <p>The score is based in a comparison of the field value and the user data entry, and it
* ranges from {@code 0.0F} to {@code 1.0F}:
* <ul>
* <li>{@code 1.0F} represents a full match ({@code 100%}).
* <li>{@code 0.0F} represents a full mismatch ({@code 0%}).
* <li>Any other value is a partial match.
* </ul>
*
* <p>How the score is calculated depends on the algorithm used by the {@link Scorer}
* implementation.
*/
public float getScore() {
return mScore;
}
@Override
public String toString() {
if (!sDebug) return super.toString();
final StringBuilder string = new StringBuilder("Match: remoteId=");
Helper.appendRedacted(string, mRemoteId);
return string.append(", score=").append(mScore).toString();
}
private void writeToParcel(@NonNull Parcel parcel) {
parcel.writeString(mRemoteId);
parcel.writeFloat(mScore);
}
private static Match readFromParcel(@NonNull Parcel parcel) {
return new Match(parcel.readString(), parcel.readFloat());
}
}
}
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