1 /*
2  * Copyright (C) 2006 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 
17 package android.text.method;
18 
19 import android.compat.annotation.UnsupportedAppUsage;
20 import android.os.Build;
21 
22 /**
23  * This transformation method causes any carriage return characters (\r)
24  * to be hidden by displaying them as zero-width non-breaking space
25  * characters (\uFEFF).
26  */
27 public class HideReturnsTransformationMethod
28 extends ReplacementTransformationMethod {
29     private static char[] ORIGINAL = new char[] { '\r' };
30     private static char[] REPLACEMENT = new char[] { '\uFEFF' };
31 
32     /**
33      * The character to be replaced is \r.
34      */
getOriginal()35     protected char[] getOriginal() {
36         return ORIGINAL;
37     }
38 
39     /**
40      * The character that \r is replaced with is \uFEFF.
41      */
getReplacement()42     protected char[] getReplacement() {
43         return REPLACEMENT;
44     }
45 
getInstance()46     public static HideReturnsTransformationMethod getInstance() {
47         if (sInstance != null)
48             return sInstance;
49 
50         sInstance = new HideReturnsTransformationMethod();
51         return sInstance;
52     }
53 
54     @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
55     private static HideReturnsTransformationMethod sInstance;
56 }
57