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annotate src/goodjava/json/JsonToString.java @ 1410:dc625408def8

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minor
author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 30 Sep 2019 16:58:28 -0600
parents 27efb1fcbcb5
children 59fd2e8b1b9d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1402
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diff changeset
1 package goodjava.json;
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2
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3 import java.util.List;
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4 import java.util.Map;
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5 import java.util.Iterator;
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6
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7
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8 public class JsonToString {
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9
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10 public static final class JsonException extends RuntimeException {
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11 private JsonException(String msg) {
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12 super(msg);
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13 }
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14 }
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15
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16 public static String toString(Object obj) throws JsonException {
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17 StringBuilder sb = new StringBuilder();
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18 new JsonToString().toString(obj,sb,0);
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19 sb.append('\n');
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20 return sb.toString();
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21 }
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22
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23 public static String toCompressedString(Object obj) throws JsonException {
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24 StringBuilder sb = new StringBuilder();
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25 JsonToString jts = new JsonToString() {
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26 void indent(StringBuilder sb,int indented) {}
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27 };
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28 jts.toString(obj,sb,0);
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29 return sb.toString();
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30 }
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31
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32 private void toString(Object obj,StringBuilder sb,int indented) throws JsonException {
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33 if( obj == null || obj instanceof Boolean || obj instanceof Number ) {
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34 sb.append(obj);
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35 return;
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36 }
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37 if( obj instanceof String ) {
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38 toString((String)obj,sb);
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39 return;
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40 }
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41 if( obj instanceof List ) {
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42 toString((List)obj,sb,indented);
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43 return;
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44 }
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45 if( obj instanceof Map ) {
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46 toString((Map)obj,sb,indented);
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47 return;
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48 }
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49 throw new JsonException("can't handle type "+obj.getClass().getName());
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50 }
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51
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52 private static void toString(final String s,StringBuilder sb) {
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53 sb.append('"');
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54 for( int i=0; i<s.length(); i++ ) {
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55 char c = s.charAt(i);
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56 switch(c) {
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57 case '"':
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58 sb.append("\\\"");
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59 break;
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60 case '\\':
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61 sb.append("\\\\");
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62 break;
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63 case '\b':
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64 sb.append("\\b");
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65 break;
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66 case '\f':
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67 sb.append("\\f");
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68 break;
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69 case '\n':
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70 sb.append("\\n");
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71 break;
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72 case '\r':
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73 sb.append("\\r");
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74 break;
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75 case '\t':
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76 sb.append("\\t");
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77 break;
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78 default:
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79 sb.append(c);
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80 }
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81 }
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82 sb.append('"');
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83 }
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84
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85 public static String javascriptEncode(String s) {
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86 StringBuilder sb = new StringBuilder();
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87 for( int i=0; i<s.length(); i++ ) {
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88 char c = s.charAt(i);
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89 switch(c) {
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90 case '"':
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91 sb.append("\\\"");
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92 break;
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93 case '\'': // added for javascript
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94 sb.append("\\'");
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95 break;
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96 case '\\':
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97 sb.append("\\\\");
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98 break;
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99 case '\b':
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100 sb.append("\\b");
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101 break;
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102 case '\f':
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103 sb.append("\\f");
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104 break;
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105 case '\n':
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106 sb.append("\\n");
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107 break;
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108 case '\r':
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109 sb.append("\\r");
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110 break;
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111 case '\t':
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112 sb.append("\\t");
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113 break;
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114 default:
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115 sb.append(c);
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116 }
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117 }
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118 return sb.toString();
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119 }
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120
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121 private void toString(List list,StringBuilder sb,int indented) {
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122 sb.append('[');
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123 if( !list.isEmpty() ) {
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124 indent(sb,indented+1);
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125 toString(list.get(0),sb,indented+1);
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126 for( int i=1; i<list.size(); i++ ) {
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127 sb.append(", ");
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128 toString(list.get(i),sb,indented+1);
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129 }
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130 indent(sb,indented);
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131 }
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132 sb.append(']');
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133 return;
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134 }
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135
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136 private void toString(Map map,StringBuilder sb,int indented) throws JsonException {
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137 sb.append('{');
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138 if( !map.isEmpty() ) {
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139 Iterator<Map.Entry> i = map.entrySet().iterator();
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140 indent(sb,indented+1);
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141 toString(i.next(),sb,indented+1);
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142 while( i.hasNext() ) {
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143 sb.append(',');
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144 indent(sb,indented+1);
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145 toString(i.next(),sb,indented+1);
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146 }
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147 indent(sb,indented);
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148 }
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149 sb.append('}');
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150 }
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151
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152 private void toString(Map.Entry entry,StringBuilder sb,int indented) throws JsonException {
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153 Object key = entry.getKey();
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154 if( !(key instanceof String) )
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155 throw new JsonException("table keys must be strings");
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156 toString((String)key,sb);
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157 sb.append(": ");
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158 toString(entry.getValue(),sb,indented);
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159 }
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160
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161 void indent(StringBuilder sb,int indented) {
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162 sb.append('\n');
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163 for( int i=0; i<indented; i++ ) {
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164 sb.append('\t');
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165 }
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166 }
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167
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168 private JsonToString() {}
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169 }