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      1 /*
      2  * Copyright (C) 2015 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 com.android.messaging.util;
     17 
     18 import android.support.annotation.Nullable;
     19 
     20 public class TextUtil {
     21     /**
     22      * Returns true if the string is empty, null or only whitespace.
     23      */
     24     public static boolean isAllWhitespace(@Nullable String string) {
     25       if (string == null || string.isEmpty()) {
     26         return true;
     27       }
     28 
     29       for (int i = 0; i < string.length(); ++i) {
     30         if (!Character.isWhitespace(string.charAt(i))) {
     31           return false;
     32         }
     33       }
     34 
     35       return true;
     36     }
     37 
     38     /**
     39      * Taken from PhoneNumberUtils, where it is only available in API 21+ Replaces all unicode
     40      * (e.g. Arabic, Persian) digits with their decimal digit equivalents.
     41      *
     42      * @param number the number to perform the replacement on.
     43      * @return the replaced number.
     44      */
     45     public static String replaceUnicodeDigits(String number) {
     46         StringBuilder normalizedDigits = new StringBuilder(number.length());
     47         for (char c : number.toCharArray()) {
     48             int digit = Character.digit(c, 10);
     49             if (digit != -1) {
     50                 normalizedDigits.append(digit);
     51             } else {
     52                 normalizedDigits.append(c);
     53             }
     54         }
     55         return normalizedDigits.toString();
     56     }
     57 
     58     /**
     59      * Appends text to the stringBuilder.
     60      * If stringBuilder already has content, separator is prepended to create a separator between
     61      * entries.
     62      * @param stringBuilder The stringBuilder to add to
     63      * @param text The text to append
     64      * @param separator The separator to add if there is already text, typically "," or "\n"
     65      */
     66     public static void appendWithSeparator(final StringBuilder stringBuilder, final String text,
     67             final String separator) {
     68         if (stringBuilder.length() > 0) {
     69             stringBuilder.append(separator);
     70         }
     71         stringBuilder.append(text);
     72     }
     73 }
     74