1 /*
2  * Copyright (C) 2018 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.ext.services.autofill;
17 
18 import android.os.Bundle;
19 import android.view.autofill.AutofillValue;
20 
21 import androidx.annotation.Nullable;
22 import androidx.annotation.VisibleForTesting;
23 
24 final class ExactMatch {
25 
26     /**
27      * Arg for {@link #calculateScore} that enforces only matching the last N values.
28      *
29      * <p>Must supply an int N.</p>
30      */
31     public static final String MATCH_SUFFIX = "MATCH_SUFFIX";
32 
33     /**
34      * Gets the field classification score of 2 values based on whether they are an exact match
35      *
36      * @return {@code 1.0} if the two values are an exact match, {@code 0.0} otherwise.
37      */
38     @VisibleForTesting
calculateScore(@ullable AutofillValue actualValue, @Nullable String userDataValue, @Nullable Bundle args)39     static float calculateScore(@Nullable AutofillValue actualValue,
40             @Nullable String userDataValue, @Nullable Bundle args) {
41         if (actualValue == null || !actualValue.isText() || userDataValue == null) return 0;
42 
43         final String actualValueText = actualValue.getTextValue().toString();
44 
45         if (args == null) {
46             return actualValueText.equalsIgnoreCase(userDataValue) ? 1 : 0;
47         }
48 
49         final int suffixLength = args.getInt(MATCH_SUFFIX, -1);
50 
51         if (suffixLength < 0) {
52             throw new IllegalArgumentException("suffix argument is invalid");
53         }
54 
55         final String actualValueSuffix;
56         if (suffixLength < actualValueText.length()) {
57             actualValueSuffix = actualValueText.substring(actualValueText.length()
58                     - suffixLength);
59         } else {
60             actualValueSuffix = actualValueText;
61         }
62 
63         final String userDataValueSuffix;
64         if (suffixLength < userDataValue.length()) {
65             userDataValueSuffix = userDataValue.substring(userDataValue.length()
66                     - suffixLength);
67         } else {
68             userDataValueSuffix = userDataValue;
69         }
70 
71         return (actualValueSuffix.equalsIgnoreCase(userDataValueSuffix)) ? 1 : 0;
72     }
73 }
74