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1 /*
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2 Copyright (c) 2008 Franklin Schmidt <fschmidt@gmail.com>
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3
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4 Permission is hereby granted, free of charge, to any person obtaining a copy
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5 of this software and associated documentation files (the "Software"), to deal
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6 in the Software without restriction, including without limitation the rights
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7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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8 copies of the Software, and to permit persons to whom the Software is
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9 furnished to do so, subject to the following conditions:
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10
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11 The above copyright notice and this permission notice shall be included in
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12 all copies or substantial portions of the Software.
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13
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14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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20 THE SOFTWARE.
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21 */
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22
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23 package fschmidt.util.java;
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24
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25 import java.lang.reflect.Field;
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26 import java.net.URLDecoder;
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27 import java.net.URLEncoder;
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28 import java.util.regex.Pattern;
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29 import java.util.regex.Matcher;
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30
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31
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32 public final class HtmlUtils {
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33 private HtmlUtils() {} // never
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34
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35 public static String htmlEncode(String s) {
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36 char[] a = s.toCharArray();
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37 StringBuilder buf = new StringBuilder();
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38 for( int i=0; i<a.length; i++ ) {
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39 char c = a[i];
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40 switch(c) {
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41 case '&':
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42 buf.append("&");
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43 break;
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44 case '<':
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45 buf.append("<");
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46 break;
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47 case '>':
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48 buf.append(">");
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49 break;
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50 case '"':
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51 buf.append(""");
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52 break;
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53 default:
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54 buf.append(c);
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55 }
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56 }
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57 return buf.toString();
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58 }
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59
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60 private static final Pattern entityPtn = Pattern.compile(
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61 "&#(\\d+);"
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62 );
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63
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64 public static String htmlDecode(String s) {
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65 StringBuffer buf = new StringBuffer();
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66 Matcher m = entityPtn.matcher(s);
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67 while( m.find() ) {
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68 String entity = new String(new char[]{(char)Integer.parseInt(m.group(1))});
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69 m.appendReplacement(buf,entity);
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70 }
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71 m.appendTail(buf);
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72 s = buf.toString();
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73 s = s.replace(" "," ");
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74 s = s.replace(""","\"");
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75 s = s.replace(">",">");
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76 s = s.replace("<","<");
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77 s = s.replace("&","&");
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78 return s;
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79 }
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80
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81 public static String javascriptStringEncode(String s) {
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82 char[] a = s.toCharArray();
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83 StringBuilder buf = new StringBuilder();
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84 for( int i=0; i<a.length; i++ ) {
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85 char c = a[i];
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86 switch(c) {
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87 case '\\':
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88 buf.append("\\\\");
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89 break;
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90 case '\'':
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91 buf.append("\\'");
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92 break;
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93 case '\"':
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94 buf.append("\\\"");
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95 break;
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96 case '\n':
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97 buf.append("\\n");
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98 break;
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99 case '\r':
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100 buf.append("\\r");
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101 break;
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102 case '<':
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103 buf.append("\\x3C");
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104 break;
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105 case '>':
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106 buf.append("\\x3E");
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107 break;
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108 case '=':
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109 buf.append("\\x3D");
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110 break;
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111 default:
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112 buf.append(c);
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113 }
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114 }
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115 return buf.toString();
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116 }
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117
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118 public static String breakUp(final String text,int maxSize,boolean hasCharEntities) {
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119 StringBuilder buf = new StringBuilder();
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120 int n = 0;
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121 int len = text.length();
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122 for( int i=0; i<len; i++ ) {
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123 char c = text.charAt(i);
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124 if( hasCharEntities && c=='&' ) {
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125 do {
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126 buf.append(c);
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127 c = text.charAt(++i);
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128 } while( c != ';' );
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129 } else if( Character.isWhitespace(c) ) {
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130 n = 0;
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131 } else {
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132 if( ++n > maxSize ) {
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133 buf.append("<wbr />");
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134 n = 0;
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135 }
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136 }
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137 buf.append(c);
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138 }
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139 return buf.toString();
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140 }
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141
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142 public static String urlEncode(String s) {
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143 try {
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144 return URLEncoder.encode(s,"UTF-8");
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145 } catch(java.io.UnsupportedEncodingException e) {
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146 throw new RuntimeException(e);
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147 }
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148 }
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149
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150 public static String urlDecode(String s) {
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151 try {
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152 return URLDecoder.decode(s,"UTF-8");
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153 } catch(java.io.UnsupportedEncodingException e) {
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154 throw new RuntimeException(e);
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155 }
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156 }
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157
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158 public static String toJson(Object object) {
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159 StringBuilder builder = new StringBuilder("{");
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160 try {
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161 Field[] fields = object.getClass().getDeclaredFields();
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162 for (Field field : fields) {
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163 field.setAccessible(true);
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164 Object value = field.get(object);
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165 if (value != null) {
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166 if (builder.length() > 1)
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167 builder.append(',');
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168 builder.append('\"').append(field.getName()).append("\": \"").append(javascriptStringEncode(value.toString())).append("\"\n");
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169 }
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170 }
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171 } catch (IllegalAccessException e) {
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172 throw new RuntimeException(e);
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173 }
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174 builder.append('}');
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175 return builder.toString();
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176 }
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177
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178 }
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