1 | package eu.clarin.cmdi.mdservice.internal; |
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2 | |
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3 | import java.io.BufferedReader; |
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4 | import java.io.ByteArrayInputStream; |
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5 | import java.io.ByteArrayOutputStream; |
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6 | import java.io.File; |
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7 | import java.io.FileOutputStream; |
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8 | import java.io.IOException; |
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9 | import java.io.InputStream; |
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10 | import java.io.InputStreamReader; |
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11 | import java.io.OutputStream; |
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12 | import java.util.Properties; |
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13 | |
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14 | import javax.xml.parsers.DocumentBuilder; |
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15 | import javax.xml.parsers.DocumentBuilderFactory; |
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16 | import javax.xml.parsers.FactoryConfigurationError; |
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17 | import javax.xml.parsers.ParserConfigurationException; |
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18 | import javax.xml.transform.Result; |
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19 | import javax.xml.transform.Source; |
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20 | import javax.xml.transform.TransformerConfigurationException; |
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21 | import javax.xml.transform.TransformerException; |
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22 | import javax.xml.transform.TransformerFactory; |
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23 | import javax.xml.transform.TransformerFactoryConfigurationError; |
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24 | import javax.xml.transform.dom.DOMSource; |
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25 | import javax.xml.transform.stream.StreamResult; |
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26 | import javax.xml.xpath.XPath; |
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27 | import javax.xml.xpath.XPathConstants; |
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28 | import javax.xml.xpath.XPathExpression; |
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29 | import javax.xml.xpath.XPathExpressionException; |
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30 | import javax.xml.xpath.XPathFactory; |
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31 | |
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32 | import org.w3c.dom.Document; |
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33 | import org.w3c.dom.Element; |
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34 | import org.w3c.dom.Node; |
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35 | import org.xml.sax.SAXException; |
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36 | |
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37 | import net.sf.json.JSON; |
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38 | import net.sf.json.JSONSerializer; |
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39 | import net.sf.json.xml.XMLSerializer; |
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40 | |
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41 | import org.apache.log4j.Logger; |
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42 | |
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43 | /** |
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44 | * Helper class provides reading of configuration properties and contains |
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45 | * all other helper and conversion functions. |
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46 | * |
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47 | * @author |
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48 | * |
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49 | */ |
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50 | |
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51 | public class Utils { |
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52 | |
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53 | public static Logger log = Logger.getLogger("Utils"); |
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54 | |
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55 | /** |
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56 | * Constant filename of application properties file. |
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57 | */ |
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58 | private static String config_path = "mdservice.properties"; |
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59 | private static Properties config; |
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60 | |
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61 | |
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62 | /** |
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63 | * Loads application configuration properties from filename in class constant config_path. |
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64 | */ |
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65 | public static void loadConfig() { |
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66 | loadConfig(config_path); |
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67 | } |
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68 | |
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69 | /** |
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70 | * Loads application configuration properties from properties file configPath. |
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71 | * |
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72 | * @param configPath - pathname string of java properties file. |
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73 | */ |
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74 | public static void loadConfig(String configPath) { |
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75 | |
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76 | System.setProperty("javax.xml.transform.TransformerFactory", "net.sf.saxon.TransformerFactoryImpl"); |
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77 | InputStream config_file; |
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78 | |
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79 | try { |
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80 | config_file = Utils.class.getClassLoader().getResourceAsStream(configPath); |
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81 | if (config_file == null) { |
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82 | log.error("CONFIGURATION ERROR: Properties file not found!"); |
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83 | } else { |
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84 | log.debug("Reading configuration from: " + Utils.class.getClassLoader().getResource(configPath)); |
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85 | config = new Properties(); |
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86 | config.load(config_file); |
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87 | } |
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88 | |
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89 | } catch (Exception e) { |
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90 | log.error("CONFIGURATION LOAD ERROR: " + e.getLocalizedMessage()); |
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91 | } |
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92 | } |
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93 | |
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94 | /** |
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95 | * Returns application configuration properties. |
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96 | * |
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97 | * @return |
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98 | */ |
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99 | public static Properties getConfig() { |
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100 | if (config==null) { |
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101 | loadConfig(config_path); |
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102 | } |
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103 | return config; |
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104 | } |
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105 | |
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106 | /** |
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107 | * convenience function to get a config property value |
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108 | * @param key |
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109 | * @return |
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110 | */ |
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111 | public static String getConfig(String key) { |
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112 | return getConfig().getProperty(key); |
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113 | } |
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114 | |
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115 | |
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116 | /** |
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117 | * Creates error message string from exception data. |
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118 | * |
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119 | * @param e - The exception object. |
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120 | * @return |
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121 | */ |
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122 | public static String errorMessage(Exception e){ |
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123 | String message = e.getStackTrace()[0].getFileName() + ":" + String.valueOf(e.getStackTrace()[0].getLineNumber()) + " "+ e.getClass() + ": " + e.getLocalizedMessage(); |
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124 | |
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125 | return message; |
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126 | } |
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127 | |
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128 | /** |
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129 | * Creates error message string from error data. |
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130 | * |
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131 | * @param e - The error object. |
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132 | * @return |
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133 | */ |
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134 | public static String errorMessage(Error e){ |
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135 | String message = e.getStackTrace()[0].getFileName() + ":" + String.valueOf(e.getStackTrace()[0].getLineNumber()) + " "+ e.getClass() + ": " + e.getLocalizedMessage(); |
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136 | |
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137 | return message; |
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138 | } |
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139 | |
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140 | /** |
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141 | * Loads data from filename. |
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142 | * |
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143 | * @param path |
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144 | * @return |
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145 | */ |
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146 | public static InputStream load2Stream (String path) { |
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147 | |
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148 | InputStream file=null; |
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149 | |
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150 | try { |
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151 | file = Utils.class.getClassLoader().getResourceAsStream(path); |
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152 | if (file == null) { |
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153 | log.error("File not found!: " + path); |
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154 | } else { |
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155 | log.debug("Reading in: " + Utils.class.getClassLoader().getResource(path)); |
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156 | } |
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157 | } catch (Exception e) { |
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158 | log.error(Utils.errorMessage(e)); |
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159 | } |
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160 | |
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161 | return file; |
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162 | } |
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163 | |
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164 | /** |
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165 | * Writes data from stream to file. |
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166 | * |
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167 | * @param path - The filename, where the data will be write. |
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168 | * @param in - The InputStream to be written into file. |
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169 | */ |
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170 | public static void write2File (String path, InputStream in) { |
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171 | try |
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172 | { |
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173 | File f=new File(path); |
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174 | OutputStream out=new FileOutputStream(f); |
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175 | copyStreams(in,out); |
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176 | out.close(); |
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177 | } |
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178 | catch (Exception e){ |
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179 | log.error(Utils.errorMessage(e)); |
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180 | } |
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181 | } |
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182 | |
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183 | /** |
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184 | * Loads data from file to XMLDocument. |
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185 | * |
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186 | * @param path |
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187 | * @return |
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188 | */ |
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189 | public static Document load2Document(String path) |
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190 | //public static Document readFSLS(String infile) |
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191 | { |
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192 | Document document = null; |
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193 | try { |
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194 | DocumentBuilderFactory factory = |
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195 | DocumentBuilderFactory.newInstance(); |
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196 | DocumentBuilder builder = factory.newDocumentBuilder(); |
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197 | InputStream doc_is = load2Stream(path); |
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198 | document = builder.parse(doc_is); |
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199 | |
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200 | } |
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201 | catch (FactoryConfigurationError e) { |
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202 | // unable to get a document builder factory |
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203 | log.error(Utils.errorMessage(e)); |
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204 | } |
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205 | catch (ParserConfigurationException e) { |
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206 | // parser was unable to be configured |
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207 | log.error(Utils.errorMessage(e)); |
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208 | } |
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209 | catch (IOException e) { |
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210 | // i/o error |
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211 | log.error(Utils.errorMessage(e)); |
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212 | } catch (SAXException e) { |
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213 | log.error(Utils.errorMessage(e)); |
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214 | } |
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215 | |
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216 | return document; |
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217 | } |
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218 | |
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219 | /** |
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220 | * Copies inputstream in to outputstream out. |
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221 | * |
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222 | * @param in |
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223 | * @param out |
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224 | * @throws IOException |
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225 | * @throws InterruptedException |
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226 | */ |
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227 | public static void copyStreams (InputStream in, OutputStream out) throws IOException, InterruptedException { |
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228 | |
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229 | byte[] buffer = new byte[1024]; |
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230 | int len = in.read(buffer); |
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231 | while (len != -1) { |
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232 | out.write(buffer, 0, len); |
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233 | len = in.read(buffer); |
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234 | if (Thread.interrupted()) { |
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235 | throw new InterruptedException(); |
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236 | } |
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237 | } |
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238 | } |
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239 | |
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240 | /** |
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241 | * Converts stream to XML document. |
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242 | * |
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243 | * @param is |
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244 | * @return |
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245 | */ |
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246 | public static Document stream2Document(InputStream is){ |
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247 | //public static Document getDocument(InputStream is){ |
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248 | Document doc = null; |
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249 | DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance(); |
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250 | DocumentBuilder docBuilder; |
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251 | try { |
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252 | docBuilder = docFactory.newDocumentBuilder(); |
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253 | doc = docBuilder.parse(is); |
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254 | |
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255 | }catch (FactoryConfigurationError e) { |
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256 | // unable to get a document builder factory |
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257 | log.error(Utils.errorMessage(e)); |
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258 | } |
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259 | catch (ParserConfigurationException e) { |
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260 | // parser was unable to be configured |
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261 | log.error(Utils.errorMessage(e)); |
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262 | } |
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263 | catch (IOException e) { |
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264 | // i/o error |
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265 | log.error(Utils.errorMessage(e)); |
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266 | } catch (SAXException e) { |
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267 | log.error(Utils.errorMessage(e)); |
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268 | } |
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269 | |
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270 | return doc; |
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271 | } |
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272 | |
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273 | /** |
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274 | * Returns string value from XML stream according to XPath expression. |
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275 | * |
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276 | * @param is |
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277 | * @param expression |
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278 | * @return |
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279 | */ |
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280 | public static String getXPathData(InputStream is, String expression){ |
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281 | //public static String getDocumentData(InputStream is, String expression){ |
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282 | String data = ""; |
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283 | |
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284 | XPathFactory factory = XPathFactory.newInstance(); |
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285 | XPath xpath = factory.newXPath(); |
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286 | XPathExpression expr; |
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287 | try { |
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288 | expr = xpath.compile(expression); |
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289 | data = (String) expr.evaluate(stream2Document(is), XPathConstants.STRING); |
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290 | } catch (XPathExpressionException e) { |
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291 | log.error(Utils.errorMessage(e)); |
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292 | } |
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293 | |
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294 | return data; |
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295 | |
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296 | } |
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297 | |
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298 | /** |
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299 | * Creates simple XML document with given rootlement name. |
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300 | * |
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301 | * @param rootelemname |
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302 | * @return |
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303 | */ |
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304 | public static Document createDocument(String rootelemname){ |
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305 | DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance(); |
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306 | DocumentBuilder docBuilder; |
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307 | Document doc = null; |
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308 | try { |
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309 | docBuilder = docFactory.newDocumentBuilder(); |
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310 | doc = docBuilder.newDocument(); |
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311 | // append root tag <index > |
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312 | Element root = (Element) doc.createElement(rootelemname); |
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313 | doc.appendChild(root); |
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314 | } catch (Exception e){ |
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315 | log.error(Utils.errorMessage(e)); |
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316 | } |
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317 | return doc; |
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318 | } |
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319 | |
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320 | /** |
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321 | * Converts stream to string. |
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322 | * |
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323 | * @param is |
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324 | * @return |
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325 | */ |
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326 | public static String streamToString(InputStream is) { |
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327 | |
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328 | BufferedReader reader = new BufferedReader(new InputStreamReader(is)); |
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329 | StringBuilder sb = new StringBuilder(); |
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330 | String line = null; |
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331 | |
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332 | try { |
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333 | while ((line = reader.readLine()) != null) { |
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334 | sb.append(line + "\n"); |
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335 | } |
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336 | } catch (IOException e) { |
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337 | log.error(Utils.errorMessage(e)); |
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338 | } finally { |
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339 | try { |
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340 | is.close(); |
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341 | } catch (IOException e) { |
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342 | log.error(Utils.errorMessage(e)); |
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343 | } |
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344 | try { |
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345 | is.reset(); |
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346 | } catch (IOException e) { |
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347 | log.error(Utils.errorMessage(e)); |
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348 | } |
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349 | } |
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350 | |
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351 | |
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352 | return sb.toString(); |
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353 | } |
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354 | |
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355 | |
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356 | /** |
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357 | * Converts XML document to stream. |
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358 | * |
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359 | * @param node |
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360 | * @return |
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361 | * @throws TransformerConfigurationException |
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362 | * @throws TransformerException |
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363 | * @throws TransformerFactoryConfigurationError |
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364 | */ |
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365 | public static InputStream document2Stream(Node node) throws TransformerConfigurationException, TransformerException, TransformerFactoryConfigurationError{ |
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366 | |
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367 | InputStream is = null; |
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368 | ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); |
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369 | Source xmlSource; |
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370 | |
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371 | try{ |
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372 | //if (node == null) { |
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373 | // xmlSource = new DOMSource(workspace_doc); |
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374 | //} else { |
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375 | xmlSource = new DOMSource(node); |
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376 | //} |
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377 | Result outputTarget = new StreamResult(outputStream); |
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378 | TransformerFactory.newInstance().newTransformer().transform(xmlSource, outputTarget); |
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379 | is = new ByteArrayInputStream(outputStream.toByteArray()); |
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380 | |
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381 | } catch (Exception e){ |
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382 | log.error(Utils.errorMessage(e)); |
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383 | } |
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384 | |
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385 | return is; |
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386 | } |
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387 | |
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388 | public static Document append2Document(Document sourcedoc,String parenttagname, Document appenddoc){ |
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389 | |
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390 | Node r_element= sourcedoc.getElementsByTagName(parenttagname).item(0); |
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391 | Node d_element = appenddoc.getElementsByTagName("diagnostics").item(0); |
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392 | sourcedoc.adoptNode(d_element); |
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393 | r_element.appendChild(d_element); |
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394 | |
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395 | return sourcedoc; |
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396 | } |
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397 | public static void testJSON() { |
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398 | String str = "{'name':'JSON','integer':1,'double':2.0,'boolean':true,'nested':{'id':42},'array':[1,2,3]}"; |
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399 | //Query q = new Query("dc.title=dino or dinosaur", Query.RECORDSET); |
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400 | JSON json = JSONSerializer.toJSON( str); |
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401 | XMLSerializer xmlSerializer = new XMLSerializer(); |
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402 | String xml = xmlSerializer.write( json ); |
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403 | log.debug(xml); |
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404 | } |
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405 | |
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406 | } |
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407 | |
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408 | |
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