| 1 | package tuffy.util; |
| 2 | |
| 3 | import java.util.ArrayList; |
| 4 | import java.util.List; |
| 5 | |
| 6 | import org.apache.commons.lang3.StringEscapeUtils; |
| 7 | |
| 8 | import tuffy.db.SQLMan; |
| 9 | |
| 10 | /** |
| 11 | * Container of string related utilities. |
| 12 | */ |
| 13 | public class StringMan { |
| 14 | |
| 15 | private static int uniqVar = 1; |
| 16 | |
| 17 | public static String getUniqVarName(){ |
| 18 | return "uniqvar" + (uniqVar++); |
| 19 | } |
| 20 | |
| 21 | public static String escapeJavaString(String s){ |
| 22 | return StringEscapeUtils.escapeJava(s); |
| 23 | } |
| 24 | |
| 25 | /** |
| 26 | * Gets a string with all zeros. |
| 27 | * @param length |
| 28 | * @return |
| 29 | */ |
| 30 | public static String zeros(int length){ |
| 31 | StringBuilder sb = new StringBuilder(); |
| 32 | for(int i=0;i<length;i++){ |
| 33 | sb.append("0"); |
| 34 | } |
| 35 | return sb.toString(); |
| 36 | } |
| 37 | |
| 38 | /** |
| 39 | * Concatenates multiple strings with a given separator. |
| 40 | * |
| 41 | * @param sep the separator |
| 42 | * @param parts substrings to be concatenated |
| 43 | * @return the resulting string |
| 44 | */ |
| 45 | public static String join(String sep, ArrayList<String> parts) { |
| 46 | StringBuilder sb = new StringBuilder(""); |
| 47 | for(int i=0; i<parts.size(); i++) { |
| 48 | sb.append(parts.get(i)); |
| 49 | if(i != parts.size()-1) sb.append(sep); |
| 50 | } |
| 51 | return sb.toString(); |
| 52 | } |
| 53 | |
| 54 | public static String joinAndEscape(String sep, ArrayList<String> parts) { |
| 55 | StringBuilder sb = new StringBuilder(""); |
| 56 | for(int i=0; i<parts.size(); i++) { |
| 57 | sb.append(SQLMan.escapeStringNoE(parts.get(i))); |
| 58 | if(i != parts.size()-1) sb.append(sep); |
| 59 | } |
| 60 | return sb.toString(); |
| 61 | } |
| 62 | |
| 63 | public static String join(String sep, List<String> parts) { |
| 64 | StringBuilder sb = new StringBuilder(""); |
| 65 | for(int i=0; i<parts.size(); i++) { |
| 66 | sb.append(parts.get(i)); |
| 67 | if(i != parts.size()-1) sb.append(sep); |
| 68 | } |
| 69 | return sb.toString(); |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * Concatenates multiple strings with commas. |
| 74 | * |
| 75 | * @param parts list substrings to be concatenated |
| 76 | * @return the resulting string |
| 77 | */ |
| 78 | public static String commaList(ArrayList<String> parts) { |
| 79 | return join(", ", parts); |
| 80 | } |
| 81 | |
| 82 | public static String commaList(List<String> parts) { |
| 83 | return join(", ", parts); |
| 84 | } |
| 85 | |
| 86 | |
| 87 | /** |
| 88 | * Concatenates multiple strings with commas, and then |
| 89 | * surrounds the result with a pair of parentheses. |
| 90 | * |
| 91 | * @param ts substrings to be concatenated |
| 92 | * @return the resulting string |
| 93 | */ |
| 94 | public static String commaListParen(ArrayList<String> ts) { |
| 95 | return "(" + commaList(ts) + ")"; |
| 96 | } |
| 97 | |
| 98 | public static String repeat(String str, int repeat) { |
| 99 | if (str == null) { |
| 100 | return null; |
| 101 | } |
| 102 | if (repeat <= 0) { |
| 103 | return ""; |
| 104 | } |
| 105 | int inputLength = str.length(); |
| 106 | if (repeat == 1 || inputLength == 0) { |
| 107 | return str; |
| 108 | } |
| 109 | int outputLength = inputLength * repeat; |
| 110 | switch (inputLength) { |
| 111 | case 1 : |
| 112 | char ch = str.charAt(0); |
| 113 | char[] output1 = new char[outputLength]; |
| 114 | for (int i = repeat - 1; i >= 0; i--) { |
| 115 | output1[i] = ch; |
| 116 | } |
| 117 | return new String(output1); |
| 118 | case 2 : |
| 119 | char ch0 = str.charAt(0); |
| 120 | char ch1 = str.charAt(1); |
| 121 | char[] output2 = new char[outputLength]; |
| 122 | for (int i = repeat * 2 - 2; i >= 0; i--, i--) { |
| 123 | output2[i] = ch0; |
| 124 | output2[i + 1] = ch1; |
| 125 | } |
| 126 | return new String(output2); |
| 127 | default : |
| 128 | StringBuilder buf = new StringBuilder(outputLength); |
| 129 | for (int i = 0; i < repeat; i++) { |
| 130 | buf.append(str); |
| 131 | } |
| 132 | return buf.toString(); |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | } |