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
17package android.text.method;
18
19/**
20 * This transformation method causes any newline characters (\n) to be
21 * displayed as spaces instead of causing line breaks, and causes
22 * carriage return characters (\r) to have no appearance.
23 */
24public class SingleLineTransformationMethod
25extends ReplacementTransformationMethod {
26    private static char[] ORIGINAL = new char[] { '\n', '\r' };
27    private static char[] REPLACEMENT = new char[] { ' ', '\uFEFF' };
28
29    /**
30     * The characters to be replaced are \n and \r.
31     */
32    protected char[] getOriginal() {
33        return ORIGINAL;
34    }
35
36    /**
37     * The character \n is replaced with is space;
38     * the character \r is replaced with is FEFF (zero width space).
39     */
40    protected char[] getReplacement() {
41        return REPLACEMENT;
42    }
43
44    public static SingleLineTransformationMethod getInstance() {
45        if (sInstance != null)
46            return sInstance;
47
48        sInstance = new SingleLineTransformationMethod();
49        return sInstance;
50    }
51
52    private static SingleLineTransformationMethod sInstance;
53}
54