001 /* DocumentBuilderFactory.java -- 002 Copyright (C) 2004, 2005 Free Software Foundation, Inc. 003 004 This file is part of GNU Classpath. 005 006 GNU Classpath is free software; you can redistribute it and/or modify 007 it under the terms of the GNU General Public License as published by 008 the Free Software Foundation; either version 2, or (at your option) 009 any later version. 010 011 GNU Classpath is distributed in the hope that it will be useful, but 012 WITHOUT ANY WARRANTY; without even the implied warranty of 013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 General Public License for more details. 015 016 You should have received a copy of the GNU General Public License 017 along with GNU Classpath; see the file COPYING. If not, write to the 018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 019 02110-1301 USA. 020 021 Linking this library statically or dynamically with other modules is 022 making a combined work based on this library. Thus, the terms and 023 conditions of the GNU General Public License cover the whole 024 combination. 025 026 As a special exception, the copyright holders of this library give you 027 permission to link this library with independent modules to produce an 028 executable, regardless of the license terms of these independent 029 modules, and to copy and distribute the resulting executable under 030 terms of your choice, provided that you also meet, for each linked 031 independent module, the terms and conditions of the license of that 032 module. An independent module is a module which is not derived from 033 or based on this library. If you modify this library, you may extend 034 this exception to your version of the library, but you are not 035 obligated to do so. If you do not wish to do so, delete this 036 exception statement from your version. */ 037 038 package javax.xml.parsers; 039 040 import java.io.BufferedReader; 041 import java.io.File; 042 import java.io.FileInputStream; 043 import java.io.InputStream; 044 import java.io.InputStreamReader; 045 import java.io.IOException; 046 import java.util.Properties; 047 import javax.xml.validation.Schema; 048 049 /** 050 * Factory for obtaining document builders. 051 * Instances of this class are <em>not</em> guaranteed to be thread safe. 052 * 053 * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a> 054 */ 055 public abstract class DocumentBuilderFactory 056 { 057 058 private boolean namespaceAware; 059 private boolean validating; 060 private boolean ignoringElementContentWhitespace; 061 private boolean expandEntityReferences = true; 062 private boolean ignoringComments; 063 private boolean coalescing; 064 private Schema schema; 065 private boolean xIncludeAware; 066 067 protected DocumentBuilderFactory() 068 { 069 } 070 071 /** 072 * Creates a new factory instance. 073 * The implementation class to load is the first found in the following 074 * locations: 075 * <ol> 076 * <li>the <code>javax.xml.parsers.DocumentBuilderFactory</code> system 077 * property</li> 078 * <li>the above named property value in the 079 * <code><i>$JAVA_HOME</i>/lib/jaxp.properties</code> file</li> 080 * <li>the class name specified in the 081 * <code>META-INF/services/javax.xml.parsers.DocumentBuilderFactory</code> 082 * system resource</li> 083 * <li>the default factory class</li> 084 * </ol> 085 */ 086 public static DocumentBuilderFactory newInstance() 087 { 088 ClassLoader loader = Thread.currentThread().getContextClassLoader(); 089 if (loader == null) 090 { 091 loader = DocumentBuilderFactory.class.getClassLoader(); 092 } 093 String className = null; 094 int count = 0; 095 do 096 { 097 className = getFactoryClassName(loader, count++); 098 if (className != null) 099 { 100 try 101 { 102 Class<?> t = (loader != null) ? loader.loadClass(className) : 103 Class.forName(className); 104 return (DocumentBuilderFactory) t.newInstance(); 105 } 106 catch (ClassNotFoundException e) 107 { 108 className = null; 109 } 110 catch (Exception e) 111 { 112 throw new FactoryConfigurationError(e, 113 "error instantiating class " + className); 114 } 115 } 116 } 117 while (className == null && count < 3); 118 return new gnu.xml.dom.DomDocumentBuilderFactory(); 119 } 120 121 private static String getFactoryClassName(ClassLoader loader, int attempt) 122 { 123 final String propertyName = "javax.xml.parsers.DocumentBuilderFactory"; 124 switch (attempt) 125 { 126 case 0: 127 return System.getProperty(propertyName); 128 case 1: 129 try 130 { 131 File file = new File(System.getProperty("java.home")); 132 file = new File(file, "lib"); 133 file = new File(file, "jaxp.properties"); 134 InputStream in = new FileInputStream(file); 135 Properties props = new Properties(); 136 props.load(in); 137 in.close(); 138 return props.getProperty(propertyName); 139 } 140 catch (IOException e) 141 { 142 return null; 143 } 144 case 2: 145 try 146 { 147 String serviceKey = "/META-INF/services/" + propertyName; 148 InputStream in = (loader != null) ? 149 loader.getResourceAsStream(serviceKey) : 150 DocumentBuilderFactory.class.getResourceAsStream(serviceKey); 151 if (in != null) 152 { 153 BufferedReader r = 154 new BufferedReader(new InputStreamReader(in)); 155 String ret = r.readLine(); 156 r.close(); 157 return ret; 158 } 159 } 160 catch (IOException e) 161 { 162 } 163 return null; 164 default: 165 return null; 166 } 167 } 168 169 /** 170 * Creates a new document builder instance using the currently specified 171 * factory configuration. 172 * @exception ParserConfigurationException if the specified configuration 173 * is not supported 174 */ 175 public abstract DocumentBuilder newDocumentBuilder() 176 throws ParserConfigurationException; 177 178 /** 179 * Sets whether document builders obtained from this factory will be XML 180 * Namespace aware. 181 */ 182 public void setNamespaceAware(boolean awareness) 183 { 184 namespaceAware = awareness; 185 } 186 187 /** 188 * Sets whether document builders obtained from this factory will validate 189 * their input. 190 */ 191 public void setValidating(boolean validating) 192 { 193 this.validating = validating; 194 } 195 196 /** 197 * Sets whether document builders obtained from this factory will 198 * eliminate whitespace within elements that have an element-only content 199 * model. 200 */ 201 public void setIgnoringElementContentWhitespace(boolean whitespace) 202 { 203 ignoringElementContentWhitespace = whitespace; 204 } 205 206 /** 207 * Sets whether document builders obtained from this factory will expand 208 * entity reference nodes. 209 */ 210 public void setExpandEntityReferences(boolean expandEntityRef) 211 { 212 expandEntityReferences = expandEntityRef; 213 } 214 215 /** 216 * Sets whether document builders obtained from this factory will discard 217 * comment nodes. 218 */ 219 public void setIgnoringComments(boolean ignoreComments) 220 { 221 ignoringComments = ignoreComments; 222 } 223 224 /** 225 * Sets whether document builders obtained from this factory will convert 226 * CDATA sections to text nodes and normalize adjacent text nodes into a 227 * single text node. 228 */ 229 public void setCoalescing(boolean coalescing) 230 { 231 this.coalescing = coalescing; 232 } 233 234 /** 235 * Indicates whether document builders obtained from this factory will be 236 * XML Namespace aware. 237 */ 238 public boolean isNamespaceAware() 239 { 240 return namespaceAware; 241 } 242 243 /** 244 * Indicates whether document builders obtained from this factory will 245 * validate their input. 246 */ 247 public boolean isValidating() 248 { 249 return validating; 250 } 251 252 /** 253 * Indicates whether document builders obtained from this factory will 254 * eliminate whitespace within elements that have an element-only content 255 * model. 256 */ 257 public boolean isIgnoringElementContentWhitespace() 258 { 259 return ignoringElementContentWhitespace; 260 } 261 262 /** 263 * Indicates whether document builders obtained from this factory will 264 * expand entity reference nodes. 265 */ 266 public boolean isExpandEntityReferences() 267 { 268 return expandEntityReferences; 269 } 270 271 /** 272 * Indicates whether document builders obtained from this factory will 273 * discard comment nodes. 274 */ 275 public boolean isIgnoringComments() 276 { 277 return ignoringComments; 278 } 279 280 /** 281 * Indicates whether document builders obtained from this factory will 282 * convert CDATA sections to text nodes and normalize adjacent text nodes 283 * into a single text node. 284 */ 285 public boolean isCoalescing() 286 { 287 return coalescing; 288 } 289 290 /** 291 * Set the named attribute on the underlying implementation. 292 * @param name the name of the attribute 293 * @param value the new value 294 * @exception IllegalArgumentException if the attribute is not recognized 295 */ 296 public abstract void setAttribute(String name, Object value) 297 throws IllegalArgumentException; 298 299 /** 300 * Retrieves the named attribute value from the underlying implementation. 301 * @param name the name of the attribute 302 * @exception IllegalArgumentException if the attribute is not recognized 303 */ 304 public abstract Object getAttribute(String name) 305 throws IllegalArgumentException; 306 307 // -- JAXP 1.3 methods -- 308 309 /** 310 * Returns the schema. 311 * @see #setSchema 312 * @since 1.5 313 */ 314 public Schema getSchema() 315 { 316 return schema; 317 } 318 319 /** 320 * Sets the schema. 321 * @see #getSchema 322 * @since 1.5 323 */ 324 public void setSchema(Schema schema) 325 { 326 this.schema = schema; 327 } 328 329 /** 330 * Indicates whether parsers obtained from this factory will be XInclude 331 * aware. 332 * @since 1.5 333 */ 334 public boolean isXIncludeAware() 335 { 336 return xIncludeAware; 337 } 338 339 /** 340 * Sets whether parsers obtained from this factory will be XInclude aware. 341 * @since 1.5 342 */ 343 public void setXIncludeAware(boolean state) 344 { 345 xIncludeAware = state; 346 } 347 348 /** 349 * Sets the value of the specified feature. 350 * @param name the feature name (URI) 351 * @param value whether to enable the feature or not 352 * @exception ParserConfigurationException if the feature is not 353 * supported. 354 * @since 1.5 355 */ 356 public abstract void setFeature(String name, boolean value) 357 throws ParserConfigurationException; 358 359 /** 360 * Returns the value of the specified feature. 361 * @param name the feature name (URI) 362 * @exception ParserConfigurationException if the feature is not 363 * supported. 364 * @since 1.5 365 */ 366 public abstract boolean getFeature(String name) 367 throws ParserConfigurationException; 368 369 }