libjava/classpath/gnu/xml/aelfred2/JAXPFactory.java

   1 /* JAXPFactory.java --
   2    Copyright (C) 2001 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38 package gnu.xml.aelfred2;
  39
  40 import java.util.Enumeration;
  41 import java.util.Hashtable;
  42
  43 import org.xml.sax.Parser;
  44 import org.xml.sax.XMLReader;
  45 import org.xml.sax.SAXException;
  46 import org.xml.sax.SAXNotRecognizedException;
  47 import org.xml.sax.SAXNotSupportedException;
  48 import org.xml.sax.helpers.XMLReaderAdapter;
  49
  50 import javax.xml.parsers.ParserConfigurationException;
  51 import javax.xml.parsers.SAXParser;
  52 import javax.xml.parsers.SAXParserFactory;
  53
  54
  55 /**
  56  * Configurable factory to create an &AElig;lfred2 JAXP parser; required
  57  * to bootstrap using JAXP.  You should use SAX2 directly where possible,
  58  * rather than through JAXP, since that gives you better control.
  59  * This class would normally be configured as a platform default factory.
  60  *
  61  * @author David Brownell
  62  */
  63 public final class JAXPFactory
  64   extends SAXParserFactory
  65 {
  66
  67   private Hashtable flags = new Hashtable();
  68
  69   /**
  70    * Constructs a factory which normally returns a non-validating
  71    * parser.
  72    */
  73   public JAXPFactory()
  74   {
  75   }
  76
  77   public SAXParser newSAXParser()
  78     throws ParserConfigurationException, SAXException
  79   {
  80     JaxpParser jaxp = new JaxpParser();
  81     Enumeration e = flags.keys();
  82     XMLReader parser = jaxp.getXMLReader();
  83
  84     parser.setFeature(SAXDriver.FEATURE + "namespaces",
  85                       isNamespaceAware());
  86     parser.setFeature(SAXDriver.FEATURE + "validation",
  87                       isValidating());
  88     // that makes SAX2 feature flags trump JAXP
  89
  90     while (e.hasMoreElements())
  91       {
  92         String uri = (String) e.nextElement();
  93         Boolean value = (Boolean) flags.get(uri);
  94         parser.setFeature(uri, value.booleanValue());
  95       }
  96
  97     return jaxp;
  98   }
  99
 100   // yes, this "feature transfer" mechanism doesn't play well
 101
 102   public void setFeature(String name, boolean value)
 103     throws ParserConfigurationException, SAXNotRecognizedException,
 104            SAXNotSupportedException
 105   {
 106     try
 107       {
 108         // force "early" detection of errors where possible
 109         // (flags can't necessarily be set before parsing)
 110         new JaxpParser().getXMLReader().setFeature(name, value);
 111
 112         flags.put(name, Boolean.valueOf(value));
 113       }
 114     catch (SAXNotRecognizedException e)
 115       {
 116         throw new SAXNotRecognizedException(name);
 117       }
 118     catch (SAXNotSupportedException e)
 119       {
 120         throw new SAXNotSupportedException(name);
 121       }
 122     catch (Exception e)
 123       {
 124         throw new ParserConfigurationException(e.getClass().getName()
 125                                                + ": "
 126                                                + e.getMessage());
 127       }
 128   }
 129
 130   public boolean getFeature(String name)
 131     throws ParserConfigurationException, SAXNotRecognizedException,
 132            SAXNotSupportedException
 133   {
 134     Boolean value = (Boolean) flags.get(name);
 135
 136     if (value != null)
 137       {
 138         return value.booleanValue();
 139       }
 140     else
 141       {
 142         try
 143           {
 144             return new JaxpParser().getXMLReader().getFeature(name);
 145           }
 146         catch (SAXNotRecognizedException e)
 147           {
 148             throw new SAXNotRecognizedException(name);
 149           }
 150         catch (SAXNotSupportedException e)
 151           {
 152             throw new SAXNotSupportedException(name);
 153           }
 154         catch (SAXException e)
 155           {
 156             throw new ParserConfigurationException(e.getClass().getName()
 157                                                    + ": "
 158                                                    + e.getMessage());
 159           }
 160       }
 161   }
 162
 163   private static class JaxpParser
 164     extends SAXParser
 165   {
 166
 167     private XmlReader ae2 = new XmlReader();
 168     private XMLReaderAdapter parser = null;
 169
 170     JaxpParser()
 171     {
 172     }
 173
 174     public void setProperty(String id, Object value)
 175       throws SAXNotRecognizedException, SAXNotSupportedException
 176     {
 177       ae2.setProperty(id, value);
 178     }
 179
 180     public Object getProperty(String id)
 181       throws SAXNotRecognizedException, SAXNotSupportedException
 182     {
 183       return ae2.getProperty(id);
 184     }
 185
 186     public Parser getParser()
 187       throws SAXException
 188     {
 189       if (parser == null)
 190         {
 191           parser = new XMLReaderAdapter(ae2);
 192         }
 193       return parser;
 194     }
 195
 196     public XMLReader getXMLReader ()
 197       throws SAXException
 198     {
 199       return ae2;
 200     }
 201
 202     public boolean isNamespaceAware()
 203     {
 204       try
 205         {
 206           return ae2.getFeature(SAXDriver.FEATURE + "namespaces");
 207         }
 208       catch (Exception e)
 209         {
 210           throw new Error();
 211         }
 212     }
 213
 214     public boolean isValidating()
 215     {
 216       try
 217         {
 218           return ae2.getFeature(SAXDriver.FEATURE + "validation");
 219         }
 220       catch (Exception e)
 221         {
 222           throw new Error();
 223         }
 224     }
 225
 226     // TODO isXIncludeAware()
 227
 228   }
 229
 230 }
 231