svn-gvsig-desktop / tags / v1_1_Build_1015 / libraries / libDriverManager / src / com / hardcode / driverManager / WriterManager.java @ 13679
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1 | 4138 | caballero | package com.hardcode.driverManager; |
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2 | |||
3 | import java.io.File; |
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4 | import java.io.IOException; |
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5 | |||
6 | import java.net.MalformedURLException; |
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7 | import java.net.URL; |
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8 | |||
9 | import java.util.ArrayList; |
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10 | import java.util.HashMap; |
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11 | import java.util.Iterator; |
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12 | |||
13 | |||
14 | /**
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15 | * Para el writer manager, el writer viene determinado por un directorio dentro
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16 | * del cual se encuentran uno o m?s jar's. La clase Writer ha de implementar
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17 | * la interfaz Writer y su nombre debe terminar en "Writer" y tener un
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18 | * constructor sin par?metros.
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19 | *
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20 | * <p>
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21 | * Esta clase es la encargada de la carga y validaci?n de los writers y de la
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22 | * obtenci?n de los mismo apartir de un tipo
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23 | * </p>
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24 | *
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25 | * @author Vicente Caballero Navarro
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26 | */
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27 | public class WriterManager { |
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28 | private DriverValidation validation;
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29 | private HashMap nombreWriterClass = new HashMap(); |
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30 | private ArrayList failures = new ArrayList(); |
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31 | |||
32 | /**
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33 | * Devuelve un array con los directorios de los plugins
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34 | *
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35 | * @param dirExt Directorio a partir del que se cuelgan los directorios de
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36 | * los drivers
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37 | *
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38 | * @return Array de los subdirectorios
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39 | */
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40 | private File[] getPluginDirs(File dirExt) { |
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41 | if (!dirExt.exists()) {
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42 | return new File[0]; |
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43 | } |
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44 | |||
45 | ArrayList ret = new ArrayList(); |
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46 | File[] files = dirExt.listFiles(); |
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47 | |||
48 | for (int i = 0; i < files.length; i++) { |
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49 | if (files[i].isDirectory()) {
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50 | ret.add(files[i]); |
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51 | } |
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52 | } |
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53 | |||
54 | return (File[]) ret.toArray(new File[0]); |
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55 | } |
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56 | |||
57 | /**
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58 | * Obtiene los jar's de un directorio y los devuelve en un array
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59 | *
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60 | * @param dir Directorio del que se quieren obtener los jars
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61 | *
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62 | * @return Array de jars
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63 | */
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64 | private URL[] getJars(File dir) { |
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65 | ArrayList ret = new ArrayList(); |
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66 | File[] dirContent = dir.listFiles(); |
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67 | |||
68 | for (int i = 0; i < dirContent.length; i++) { |
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69 | if (dirContent[i].getName().toLowerCase().endsWith(".jar")) { |
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70 | try {
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71 | ret.add(new URL("file:" + dirContent[i].getAbsolutePath())); |
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72 | } catch (MalformedURLException e) { |
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73 | //No se puede dar
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74 | } |
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75 | } |
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76 | } |
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77 | |||
78 | return (URL[]) ret.toArray(new URL[0]); |
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79 | } |
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80 | |||
81 | /**
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82 | * Carga los drivers y asocia con el tipo del driver.
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83 | *
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84 | * @param dir Directorio ra?z de los drivers
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85 | */
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86 | public void loadWriters(File dir) { |
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87 | try {
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88 | if (validation == null) { |
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89 | validation = new DriverValidation() {
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90 | public boolean validate(Driver d) { |
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91 | return true; |
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92 | } |
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93 | }; |
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94 | } |
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95 | |||
96 | //Se obtiene la lista de directorios
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97 | File[] dirs = getPluginDirs(dir); |
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98 | |||
99 | //Para cada directorio se obtienen todos sus jars
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100 | for (int i = 0; i < dirs.length; i++) { |
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101 | URL[] jars = getJars(dirs[i]); |
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102 | |||
103 | //Se crea el classloader
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104 | DriverClassLoader cl = new DriverClassLoader(jars,
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105 | dirs[i].getAbsolutePath(), |
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106 | this.getClass().getClassLoader());
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107 | |||
108 | //Se obtienen los drivers
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109 | Class[] writers = cl.getWriters(); |
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110 | |||
111 | //Se asocian los drivers con su tipo si superan la validaci?n
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112 | for (int j = 0; j < writers.length; j++) { |
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113 | try {
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114 | Driver driver = (Driver) writers[j].newInstance(); |
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115 | |||
116 | if (validation.validate(driver)) {
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117 | if (nombreWriterClass.put(driver.getName(),
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118 | writers[j]) != null) {
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119 | throw new IllegalStateException( |
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120 | "Two drivers with the same name");
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121 | } |
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122 | } |
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123 | } catch (ClassCastException e) { |
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124 | /*
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125 | * No todos los que terminan en Driver son drivers
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126 | * de los nuestros, los ignoramos
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127 | */
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128 | } catch (Throwable t) { |
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129 | /*
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130 | * A?n a riesgo de capturar algo que no debemos, ignoramos cualquier driver que pueda
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131 | * dar cualquier tipo de problema, pero continuamos
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132 | */
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133 | failures.add(t); |
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134 | } |
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135 | } |
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136 | } |
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137 | } catch (ClassNotFoundException e) { |
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138 | failures.add((Throwable) e);
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139 | } catch (IOException e) { |
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140 | failures.add((Throwable) e);
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141 | } |
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142 | } |
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143 | /**
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144 | * DOCUMENT ME!
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145 | *
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146 | * @return DOCUMENT ME!
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147 | */
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148 | public Throwable[] getLoadFailures() { |
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149 | return (Throwable[]) failures.toArray(new Throwable[0]); |
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150 | } |
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151 | |||
152 | /**
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153 | * Obtiene el Writer asociado al tipo que se le pasa como par?metro
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154 | *
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155 | * @param name Objeto que devolvi? alguno de los writers en su m?todo
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156 | * getType
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157 | *
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158 | * @return El writer asociado o null si no se encuentra el driver
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159 | *
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160 | * @throws DriverLoadException if this Class represents an abstract class,
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161 | * an interface, an array class, a primitive type, or void; or if
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162 | * the class has no nullary constructor; or if the instantiation
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163 | * fails for some other reason
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164 | */
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165 | public Driver getWriter(String name) throws DriverLoadException { |
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166 | try {
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167 | Class driverClass = (Class) nombreWriterClass.get(name); |
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168 | if (driverClass == null) throw new DriverLoadException("No se encontr? el writer: " + name); |
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169 | return (Driver) driverClass.newInstance(); |
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170 | } catch (InstantiationException e) { |
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171 | throw new DriverLoadException(e); |
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172 | } catch (IllegalAccessException e) { |
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173 | throw new DriverLoadException(e); |
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174 | } |
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175 | } |
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176 | |||
177 | /**
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178 | * Establece el objeto validador de los drivers. En la carga se comprobar?
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179 | * si cada driver es v?lido mediante el m?todo validate del objeto
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180 | * validation establecido con este m?todo. Pro defecto se validan todos
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181 | * los drivers
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182 | *
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183 | * @param validation objeto validador
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184 | */
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185 | public void setValidation(DriverValidation validation) { |
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186 | this.validation = validation;
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187 | } |
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188 | |||
189 | /**
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190 | * Obtiene los tipos de todos los writers del sistema
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191 | *
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192 | * @return DOCUMENT ME!
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193 | */
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194 | public String[] getWriterNames() { |
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195 | ArrayList names = new ArrayList(nombreWriterClass.size()); |
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196 | |||
197 | Iterator iterator = nombreWriterClass.keySet().iterator();
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198 | |||
199 | while (iterator.hasNext()) {
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200 | names.add((String) iterator.next());
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201 | } |
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202 | |||
203 | return (String[]) names.toArray(new String[0]); |
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204 | } |
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205 | |||
206 | /**
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207 | * Obtiene la clase del writer relacionado con el tipo que se pasa como
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208 | * par?metro
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209 | *
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210 | * @param driverName DOCUMENT ME!
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211 | *
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212 | * @return DOCUMENT ME!
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213 | */
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214 | public Class getWriterClassByName(String writerName) { |
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215 | return (Class) nombreWriterClass.get(writerName); |
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216 | } |
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217 | |||
218 | /**
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219 | * DOCUMENT ME!
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220 | *
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221 | * @param writerName DOCUMENT ME!
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222 | * @param superClass DOCUMENT ME!
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223 | *
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224 | * @return DOCUMENT ME!
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225 | *
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226 | * @throws RuntimeException DOCUMENT ME!
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227 | */
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228 | public boolean isA(String writerName, Class superClass) { |
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229 | Class writerClass = (Class) nombreWriterClass.get(writerName); |
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230 | |||
231 | if (writerClass == null) { |
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232 | throw new RuntimeException("No such driver"); |
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233 | } |
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234 | |||
235 | Class[] interfaces = writerClass.getInterfaces(); |
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236 | |||
237 | if (interfaces != null) { |
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238 | for (int i = 0; i < interfaces.length; i++) { |
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239 | if (interfaces[i] == superClass) {
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240 | return true; |
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241 | } else {
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242 | if (recursiveIsA(interfaces[i], superClass)) {
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243 | return true; |
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244 | } |
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245 | } |
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246 | } |
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247 | } |
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248 | |||
249 | Class class_ = writerClass.getSuperclass();
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250 | |||
251 | if (class_ != null) { |
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252 | if (class_ == superClass) {
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253 | return true; |
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254 | } else {
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255 | if (recursiveIsA(class_, superClass)) {
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256 | return true; |
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257 | } |
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258 | } |
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259 | } |
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260 | |||
261 | return false; |
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262 | } |
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263 | |||
264 | /**
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265 | * DOCUMENT ME!
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266 | *
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267 | * @param interface_ DOCUMENT ME!
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268 | * @param superInterface DOCUMENT ME!
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269 | *
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270 | * @return DOCUMENT ME!
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271 | */
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272 | private boolean recursiveIsA(Class interface_, Class superInterface) { |
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273 | Class[] interfaces = interface_.getInterfaces(); |
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274 | |||
275 | if (interfaces != null) { |
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276 | for (int i = 0; i < interfaces.length; i++) { |
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277 | if (interfaces[i] == superInterface) {
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278 | return true; |
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279 | } else {
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280 | if (recursiveIsA(interfaces[i], superInterface)) {
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281 | return true; |
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282 | } |
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283 | } |
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284 | } |
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285 | } |
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286 | |||
287 | Class class_ = interface_.getSuperclass();
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288 | |||
289 | if (class_ != null) { |
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290 | if (class_ == superInterface) {
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291 | return true; |
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292 | } else {
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293 | if (recursiveIsA(class_, superInterface)) {
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294 | return true; |
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295 | } |
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296 | } |
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297 | } |
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298 | |||
299 | return false; |
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300 | } |
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301 | } |