1 | package com.framsticks.util.lang; |
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2 | |
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3 | import java.util.regex.Matcher; |
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4 | |
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5 | import com.framsticks.util.FramsticksException; |
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6 | |
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7 | /** |
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8 | * @author Piotr Sniegowski |
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9 | */ |
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10 | public abstract class Strings { |
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11 | |
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12 | public static String valueOf(Object o) { |
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13 | if (o == null) { |
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14 | return null; |
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15 | } |
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16 | return o.toString(); |
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17 | } |
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18 | |
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19 | public static boolean notEmpty(String str) { |
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20 | return str != null && !str.equals(""); |
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21 | } |
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22 | |
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23 | public static void assureNotEmpty(String str) { |
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24 | if (!notEmpty(str)) { |
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25 | throw new FramsticksException().msg("string is empty"); |
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26 | } |
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27 | } |
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28 | |
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29 | public static String toStringNullProof(Object object) { |
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30 | return toStringNullProof(object, ""); |
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31 | } |
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32 | |
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33 | public static String toStringNullProof(Object object, String def) { |
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34 | if (object == null) { |
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35 | return def; |
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36 | } |
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37 | return object.toString(); |
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38 | } |
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39 | |
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40 | public static String toStringEmptyProof(Object object, Object def) { |
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41 | if (object == null) { |
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42 | return def.toString(); |
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43 | } |
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44 | String v = object.toString(); |
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45 | return notEmpty(v) ? v : def.toString(); |
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46 | } |
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47 | |
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48 | public static String collapse(String s) { |
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49 | if (s == null) { |
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50 | return null; |
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51 | } |
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52 | s = s.trim(); |
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53 | return (s.equals("")) ? null : s; |
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54 | } |
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55 | |
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56 | public static Pair<String, String> splitIntoPair(String string, char separator, String second) { |
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57 | int pos = string.indexOf(separator); |
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58 | if (pos == -1) { |
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59 | return new Pair<String, String>(string, second); |
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60 | } else { |
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61 | return new Pair<String, String>(string.substring(0, pos), string.substring(pos + 1)); |
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62 | } |
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63 | } |
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64 | |
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65 | public static String capitalize(String input) { |
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66 | return input.substring(0, 1).toUpperCase() + input.substring(1); |
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67 | } |
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68 | |
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69 | public static String uncapitalize(String input) { |
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70 | return input.substring(0, 1).toLowerCase() + input.substring(1); |
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71 | } |
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72 | |
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73 | public static String commonPrefix(String a, String b) { |
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74 | int length = Math.min(a.length(), b.length()); |
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75 | int i = 0; |
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76 | while ((i < length) && (a.charAt(i) == b.charAt(i))) { |
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77 | ++i; |
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78 | } |
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79 | return a.substring(0, i); |
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80 | } |
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81 | |
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82 | public static CharSequence takeGroup(CharSequence input, Matcher matcher, int group) { |
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83 | // return (matcher.start(group) == matcher.end(group)) ? null : input.subSequence(matcher.start(group), matcher.end(group)); |
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84 | return input.subSequence(matcher.start(group), matcher.end(group)); |
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85 | } |
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86 | |
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87 | } |
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