1 /*
2  * Copyright (C) 2011 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;
18 
19 /**
20  * Interface for objects that use a heuristic for guessing at the paragraph direction by examining text.
21  */
22 public interface TextDirectionHeuristic {
23     /**
24      * Guess if a chars array is in the RTL direction or not.
25      *
26      * @param array the char array.
27      * @param start start index, inclusive.
28      * @param count the length to check, must not be negative and not greater than
29      *          {@code array.length - start}.
30      * @return true if all chars in the range are to be considered in a RTL direction,
31      *          false otherwise.
32      */
isRtl(char[] array, int start, int count)33     boolean isRtl(char[] array, int start, int count);
34 
35     /**
36      * Guess if a {@code CharSequence} is in the RTL direction or not.
37      *
38      * @param cs the CharSequence.
39      * @param start start index, inclusive.
40      * @param count the length to check, must not be negative and not greater than
41      *            {@code CharSequence.length() - start}.
42      * @return true if all chars in the range are to be considered in a RTL direction,
43      *          false otherwise.
44      */
isRtl(CharSequence cs, int start, int count)45     boolean isRtl(CharSequence cs, int start, int count);
46 }
47