001/* SchemaFactory.java -- 002 Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc. 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038package javax.xml.validation; 039 040import java.io.BufferedReader; 041import java.io.File; 042import java.io.FileInputStream; 043import java.io.InputStream; 044import java.io.InputStreamReader; 045import java.io.IOException; 046import java.net.URL; 047import java.util.Properties; 048import javax.xml.XMLConstants; 049import javax.xml.transform.Source; 050import javax.xml.transform.stream.StreamSource; 051import org.w3c.dom.ls.LSResourceResolver; 052import org.xml.sax.ErrorHandler; 053import org.xml.sax.SAXException; 054import org.xml.sax.SAXNotRecognizedException; 055import org.xml.sax.SAXNotSupportedException; 056 057/** 058 * Factory for obtaining schemata. 059 * 060 * @author Chris Burdess (dog@gnu.org) 061 * @since 1.5 062 */ 063public abstract class SchemaFactory 064{ 065 protected SchemaFactory() 066 { 067 } 068 069 /** 070 * Returns an implementation of <code>SchemaFactory</code> that supports 071 * the specified schema language. 072 * @param schemaLanguage the URI of a schema language (see 073 * <code>XMLConstants</code>) 074 */ 075 public static final SchemaFactory newInstance(String schemaLanguage) 076 { 077 ClassLoader loader = Thread.currentThread().getContextClassLoader(); 078 if (loader == null) 079 { 080 loader = SchemaFactory.class.getClassLoader(); 081 } 082 final String factoryClassName = "javax.xml.validation.SchemaFactory"; 083 String className = null; 084 int count = 0; 085 do 086 { 087 className = getFactoryClassName(loader, schemaLanguage, count++); 088 if (className != null) 089 { 090 try 091 { 092 Class<?> t = (loader != null) ? loader.loadClass(className) : 093 Class.forName(className); 094 return (SchemaFactory) t.newInstance(); 095 } 096 catch (Exception e) 097 { 098 // Ignore any errors and continue algorithm. 099 // This method doesn't have a means of propagating 100 // class instantiation errors. 101 className = null; 102 } 103 } 104 } 105 while (className == null && count < 2); 106 try 107 { 108 String serviceKey = "/META-INF/services/" + factoryClassName; 109 InputStream in = (loader != null) ? 110 loader.getResourceAsStream(serviceKey) : 111 SchemaFactory.class.getResourceAsStream(serviceKey); 112 if (in != null) 113 { 114 BufferedReader r = 115 new BufferedReader(new InputStreamReader(in)); 116 try 117 { 118 for (String line = r.readLine(); line != null; 119 line = r.readLine()) 120 { 121 Class<?> t = (loader != null) ? loader.loadClass(className) : 122 Class.forName(className); 123 SchemaFactory ret = (SchemaFactory) t.newInstance(); 124 if (ret.isSchemaLanguageSupported(schemaLanguage)) 125 return ret; 126 } 127 } 128 catch (Exception e) 129 { 130 // Fall through. See above. 131 } 132 finally 133 { 134 r.close(); 135 } 136 } 137 } 138 catch (IOException e) 139 { 140 } 141 // Default schema factories for Classpath 142 if (XMLConstants.W3C_XML_SCHEMA_NS_URI.equals(schemaLanguage)) 143 return new gnu.xml.validation.xmlschema.XMLSchemaSchemaFactory(); 144 if (XMLConstants.RELAXNG_NS_URI.equals(schemaLanguage)) 145 return new gnu.xml.validation.relaxng.RELAXNGSchemaFactory(); 146 throw new IllegalArgumentException(schemaLanguage); 147 } 148 149 private static String getFactoryClassName(ClassLoader loader, 150 String schemaLanguage, int attempt) 151 { 152 final String factoryClassName = "javax.xml.validation.SchemaFactory"; 153 final String propertyName = factoryClassName + ":" + schemaLanguage; 154 switch (attempt) 155 { 156 case 0: 157 return System.getProperty(propertyName); 158 case 1: 159 try 160 { 161 File file = new File(System.getProperty("java.home")); 162 file = new File(file, "lib"); 163 file = new File(file, "jaxp.properties"); 164 InputStream in = new FileInputStream(file); 165 Properties props = new Properties(); 166 props.load(in); 167 in.close(); 168 return props.getProperty(propertyName); 169 } 170 catch (IOException e) 171 { 172 return null; 173 } 174 default: 175 return null; 176 } 177 } 178 179 /** 180 * Indicates whether the specified schema language is supported. 181 * @param schemaLanguage the URI of a schema language (see 182 * <code>XMLConstants</code>) 183 */ 184 public abstract boolean isSchemaLanguageSupported(String schemaLanguage); 185 186 public boolean getFeature(String name) 187 throws SAXNotRecognizedException, SAXNotSupportedException 188 { 189 throw new SAXNotRecognizedException(name); 190 } 191 192 public void setFeature(String name, boolean value) 193 throws SAXNotRecognizedException, SAXNotSupportedException 194 { 195 throw new SAXNotRecognizedException(name); 196 } 197 198 public Object getProperty(String name) 199 throws SAXNotRecognizedException, SAXNotSupportedException 200 { 201 throw new SAXNotRecognizedException(name); 202 } 203 204 public void setProperty(String name, Object value) 205 throws SAXNotRecognizedException, SAXNotSupportedException 206 { 207 throw new SAXNotRecognizedException(name); 208 } 209 210 public abstract ErrorHandler getErrorHandler(); 211 212 public abstract void setErrorHandler(ErrorHandler errorHandler); 213 214 public abstract LSResourceResolver getResourceResolver(); 215 216 public abstract void setResourceResolver(LSResourceResolver resourceResolver); 217 218 /** 219 * Returns a schema based on the specified source resource. 220 * @param schema the source resource 221 */ 222 public Schema newSchema(Source schema) 223 throws SAXException 224 { 225 return newSchema(new Source[] { schema }); 226 } 227 228 /** 229 * Returns a schema based on the specified source file. 230 * @param schema the source resource 231 */ 232 public Schema newSchema(File schema) 233 throws SAXException 234 { 235 return newSchema(new StreamSource(schema)); 236 } 237 238 /** 239 * Returns a schema based on the specified URL. 240 * @param schema the source resource 241 */ 242 public Schema newSchema(URL schema) 243 throws SAXException 244 { 245 return newSchema(new StreamSource(schema.toString())); 246 } 247 248 /** 249 * Parses the specified sources, and combine them into a single schema. 250 * The exact procedure and semantics of this depends on the schema 251 * language. 252 * @param schemata the schema resources to load 253 */ 254 public abstract Schema newSchema(Source[] schemata) 255 throws SAXException; 256 257 /** 258 * Creates a special schema. 259 * The exact semantics of this depends on the schema language. 260 */ 261 public abstract Schema newSchema() 262 throws SAXException; 263 264}