1 /** |
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2 * SQL-DK |
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3 * Copyright © 2013 František Kučera (frantovo.cz) |
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4 * |
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5 * This program is free software: you can redistribute it and/or modify |
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6 * it under the terms of the GNU General Public License as published by |
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7 * the Free Software Foundation, either version 3 of the License, or |
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8 * (at your option) any later version. |
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9 * |
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10 * This program is distributed in the hope that it will be useful, |
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 * GNU General Public License for more details. |
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14 * |
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15 * You should have received a copy of the GNU General Public License |
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16 * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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17 */ |
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18 package info.globalcode.sql.dk; |
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19 |
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20 import info.globalcode.sql.dk.configuration.NameIdentified; |
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21 import info.globalcode.sql.dk.configuration.PropertyDeclaration; |
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22 import info.globalcode.sql.dk.configuration.PropertyDeclarations; |
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23 import info.globalcode.sql.dk.formatting.Formatter; |
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24 import java.io.BufferedReader; |
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25 import java.io.File; |
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26 import java.io.IOException; |
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27 import java.io.InputStream; |
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28 import java.io.InputStreamReader; |
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29 import java.io.PrintWriter; |
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30 import java.util.ArrayList; |
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31 import java.util.Arrays; |
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32 import java.util.Collection; |
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33 import java.util.Collections; |
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34 import java.util.List; |
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35 import java.util.Map; |
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36 import java.util.regex.Matcher; |
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37 import java.util.regex.Pattern; |
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38 |
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39 /** |
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40 * |
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41 * @author Ing. František Kučera (frantovo.cz) |
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42 */ |
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43 public class Functions { |
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44 |
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45 private static final String NBSP = " "; |
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46 private static final Pattern WHITESPACE_TO_REPLACE = Pattern.compile("\\n|\\r|\\t|" + NBSP); |
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47 |
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48 private Functions() { |
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49 } |
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50 |
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51 public static boolean equalz(Object a, Object b) { |
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52 return a == null ? b == null : a.equals(b); |
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53 } |
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54 |
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55 /** |
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56 * |
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57 * @param text String to be examinated |
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58 * @param trim whether text should be trimmed before examination |
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59 * @return whether text is not empty and one or more characters long (after prospective trim) |
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60 */ |
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61 public static boolean isEmpty(String text, boolean trim) { |
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62 if (text == null) { |
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63 return true; |
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64 } else { |
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65 if (trim) { |
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66 text = text.trim(); |
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67 } |
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68 return text.isEmpty(); |
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69 } |
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70 } |
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71 |
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72 /** |
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73 * @see #isEmpty(java.lang.String, boolean) |
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74 */ |
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75 public static boolean isNotEmpty(String text, boolean trim) { |
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76 return !isEmpty(text, trim); |
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77 } |
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78 |
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79 public boolean isEmpty(Collection c) { |
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80 return c == null || c.isEmpty(); |
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81 } |
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82 |
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83 public boolean isNotEmpty(Collection c) { |
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84 return !isEmpty(c); |
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85 } |
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86 |
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87 public boolean isEmpty(Map m) { |
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88 return m == null || m.isEmpty(); |
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89 } |
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90 |
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91 public boolean isNotEmpty(Map m) { |
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92 return !isEmpty(m); |
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93 } |
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94 |
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95 /** |
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96 * @return empty collection if given one is null | or the original one |
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97 */ |
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98 public static <T> Collection<T> notNull(Collection<T> c) { |
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99 if (c == null) { |
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100 return Collections.emptyList(); |
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101 } else { |
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102 return c; |
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103 } |
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104 } |
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105 |
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106 public static <T extends NameIdentified> T findByName(Collection<T> collection, String name) { |
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107 for (T element : notNull(collection)) { |
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108 if (element != null && equalz(element.getName(), name)) { |
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109 return element; |
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110 } |
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111 } |
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112 |
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113 return null; |
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114 } |
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115 |
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116 /** |
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117 * Copy file from Java resources to file system. |
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118 */ |
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119 public static void installResource(String resourceName, File target) throws IOException { |
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120 try (BufferedReader reader = new BufferedReader(new InputStreamReader(Functions.class.getClassLoader().getResourceAsStream(resourceName)))) { |
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121 try (PrintWriter writer = new PrintWriter(target)) { |
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122 while (true) { |
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123 String line = reader.readLine(); |
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124 if (line == null) { |
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125 break; |
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126 } else { |
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127 writer.println(line); |
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128 } |
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129 } |
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130 } |
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131 } |
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132 } |
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133 |
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134 public static String rpad(String s, int n) { |
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135 if (n > 0) { |
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136 return String.format("%1$-" + n + "s", s); |
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137 } else { |
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138 return s; |
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139 } |
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140 } |
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141 |
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142 public static String lpad(String s, int n) { |
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143 if (n > 0) { |
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144 return String.format("%1$" + n + "s", s); |
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145 } else { |
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146 return s; |
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147 } |
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148 } |
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149 |
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150 public static String repeat(char ch, int count) { |
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151 char[] array = new char[count]; |
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152 Arrays.fill(array, ch); |
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153 return new String(array); |
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154 } |
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155 private final static char[] HEX_ALPHABET = "0123456789abcdef".toCharArray(); |
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156 |
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157 public static String toHex(byte[] bytes) { |
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158 char[] hexChars = new char[bytes.length * 2]; |
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159 for (int j = 0; j < bytes.length; j++) { |
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160 int v = bytes[j] & 0xFF; |
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161 hexChars[j * 2] = HEX_ALPHABET[v >>> 4]; |
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162 hexChars[j * 2 + 1] = HEX_ALPHABET[v & 0x0F]; |
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163 } |
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164 return new String(hexChars); |
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165 } |
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166 |
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167 public static String readString(InputStream in) throws IOException { |
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168 try (BufferedReader br = new BufferedReader(new InputStreamReader(in))) { |
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169 StringBuilder result = new StringBuilder(); |
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170 for (String line = br.readLine(); line != null; line = br.readLine()) { |
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171 result.append(line); |
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172 result.append('\n'); |
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173 } |
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174 return result.toString(); |
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175 } |
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176 } |
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177 |
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178 /** |
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179 * @param <P> type of the last parent |
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180 * @param <T> type of the examined class |
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181 * @param type examined class |
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182 * @param lastParent the last parent type to stop at |
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183 * @return list of types starting with <code>type</code> and ending with <code>lastParent</code> |
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184 */ |
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185 public static <P, T extends P> List<Class<? extends P>> getClassHierarchy(Class<T> type, Class<P> lastParent) { |
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186 List<Class<? extends P>> hierarchy = new ArrayList<>(); |
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187 |
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188 for (Class current = type; current != null && lastParent.isAssignableFrom(current); current = current.getSuperclass()) { |
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189 hierarchy.add(current); |
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190 } |
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191 |
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192 return hierarchy; |
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193 } |
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194 |
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195 public static PropertyDeclaration[] getPropertyDeclarations(Class<? extends Formatter> formatterClass) { |
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196 PropertyDeclarations properties = formatterClass.getAnnotation(PropertyDeclarations.class); |
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197 |
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198 if (properties == null) { |
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199 PropertyDeclaration p = formatterClass.getAnnotation(PropertyDeclaration.class); |
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200 return p == null ? new PropertyDeclaration[]{} : new PropertyDeclaration[]{p}; |
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201 } else { |
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202 return properties.value(); |
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203 } |
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204 } |
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205 |
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206 /** |
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207 * TODO: support background or styles and move to ColorfulPrintWriter |
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208 * |
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209 * @param out |
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210 * @param valueString |
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211 * @param basicColor |
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212 * @param escapeColor |
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213 */ |
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214 public static void printValueWithWhitespaceReplaced(ColorfulPrintWriter out, String valueString, ColorfulPrintWriter.TerminalColor basicColor, ColorfulPrintWriter.TerminalColor escapeColor) { |
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215 |
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216 Matcher m = WHITESPACE_TO_REPLACE.matcher(valueString); |
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217 |
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218 int start = 0; |
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219 |
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220 while (m.find(start)) { |
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221 |
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222 printColorOrNot(out, basicColor, valueString.substring(start, m.start())); |
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223 |
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224 switch (m.group()) { |
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225 case "\n": |
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226 out.print(escapeColor, "↲"); |
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227 break; |
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228 case "\r": |
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229 out.print(escapeColor, "⏎"); |
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230 break; |
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231 case "\t": |
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232 out.print(escapeColor, "↹"); |
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233 break; |
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234 case NBSP: |
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235 out.print(escapeColor, "⎵"); |
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236 break; |
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237 default: |
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238 throw new IllegalStateException("Unexpected whitespace token: „" + m.group() + "“"); |
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239 } |
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240 |
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241 start = m.end(); |
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242 } |
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243 |
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244 printColorOrNot(out, basicColor, valueString.substring(start, valueString.length())); |
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245 } |
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246 |
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247 private static void printColorOrNot(ColorfulPrintWriter out, ColorfulPrintWriter.TerminalColor color, String text) { |
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248 if (color == null) { |
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249 out.print(text); |
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250 } else { |
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251 out.print(color, text); |
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252 } |
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253 } |
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254 } |
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