Source for gnu.xml.dom.DomDocumentBuilderFactory

   1: /* DomDocumentBuilderFactory.java --
   2:    Copyright (C) 2004 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.dom;
  39: 
  40: import javax.xml.XMLConstants;
  41: import javax.xml.parsers.DocumentBuilder;
  42: import javax.xml.parsers.DocumentBuilderFactory;
  43: import javax.xml.parsers.FactoryConfigurationError;
  44: import javax.xml.parsers.ParserConfigurationException;
  45: import org.w3c.dom.DOMConfiguration;
  46: import org.w3c.dom.DOMException;
  47: import org.w3c.dom.DOMImplementation;
  48: import org.w3c.dom.bootstrap.DOMImplementationRegistry;
  49: import org.w3c.dom.ls.DOMImplementationLS;
  50: import org.w3c.dom.ls.LSParser;
  51: 
  52: /**
  53:  * Document builder factory that uses a DOM Level 3 Load & Save
  54:  * implementation.
  55:  *
  56:  * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
  57:  */
  58: public class DomDocumentBuilderFactory
  59:   extends DocumentBuilderFactory
  60: {
  61: 
  62:   final DOMImplementation impl;
  63:   final DOMImplementationLS ls;
  64:   private boolean secureProcessing;
  65: 
  66:   public DomDocumentBuilderFactory()
  67:   {
  68:     try
  69:       {
  70:         DOMImplementationRegistry reg =
  71:           DOMImplementationRegistry.newInstance();
  72:         impl = reg.getDOMImplementation("LS 3.0");
  73:         if (impl == null)
  74:           {
  75:             throw new FactoryConfigurationError("no LS implementations found");
  76:           }
  77:         ls = (DOMImplementationLS) impl;
  78:       }
  79:     catch (Exception e)
  80:       {
  81:         throw new FactoryConfigurationError(e);
  82:       }
  83:   }
  84: 
  85:   public DocumentBuilder newDocumentBuilder()
  86:     throws ParserConfigurationException
  87:   {
  88:     LSParser parser = null;
  89:     try
  90:       {
  91:         parser = ls.createLSParser(DOMImplementationLS.MODE_ASYNCHRONOUS,
  92:                                    "http://www.w3.org/TR/REC-xml");
  93:       }
  94:     catch (DOMException e)
  95:       {
  96:         if (e.code == DOMException.NOT_SUPPORTED_ERR)
  97:           {
  98:             // Fall back to synchronous parser
  99:             try
 100:               {
 101:                 parser = ls.createLSParser(DOMImplementationLS.MODE_SYNCHRONOUS,
 102:                                            "http://www.w3.org/TR/REC-xml");
 103:               }
 104:             catch (DOMException e2)
 105:               {
 106:                 ParserConfigurationException pce =
 107:                     new ParserConfigurationException();
 108:                 pce.initCause(e2);
 109:                 throw pce;
 110:               }
 111:           }
 112:         else
 113:           {
 114:             ParserConfigurationException pce =
 115:                 new ParserConfigurationException();
 116:             pce.initCause(e);
 117:             throw pce;
 118:           }
 119:       }
 120:     DOMConfiguration config = parser.getDomConfig();
 121:     setParameter(config, "namespaces",
 122:                  isNamespaceAware() ? Boolean.TRUE : Boolean.FALSE);
 123:     setParameter(config, "element-content-whitespace",
 124:                  isIgnoringElementContentWhitespace() ? Boolean.FALSE :
 125:                  Boolean.TRUE);
 126:     setParameter(config, "comments",
 127:                  isIgnoringComments() ? Boolean.FALSE : Boolean.TRUE);
 128:     setParameter(config, "expand-entity-references",
 129:                  isExpandEntityReferences() ? Boolean.TRUE : Boolean.FALSE);
 130:     setParameter(config, "coalescing",
 131:                  isCoalescing() ? Boolean.TRUE : Boolean.FALSE);
 132:     setParameter(config, "validating",
 133:                  isValidating() ? Boolean.TRUE : Boolean.FALSE);
 134:     setParameter(config, "xinclude-aware",
 135:                  isXIncludeAware() ? Boolean.TRUE : Boolean.FALSE);
 136:     return new DomDocumentBuilder(impl, ls, parser);
 137:   }
 138: 
 139:   void setParameter(DOMConfiguration config, String name, Object value)
 140:     throws ParserConfigurationException
 141:   {
 142:     if (!config.canSetParameter(name, value))
 143:       {
 144:         throw new ParserConfigurationException(name);
 145:       }
 146:     config.setParameter(name, value);
 147:   }
 148: 
 149:   public Object getAttribute(String name)
 150:   {
 151:     // TODO
 152:     return null;
 153:   }
 154: 
 155:   public void setAttribute(String name, Object value)
 156:   {
 157:     // TODO
 158:   }
 159: 
 160:   public void setFeature(String name, boolean value)
 161:     throws ParserConfigurationException
 162:   {
 163:     if (name == null)
 164:       throw new NullPointerException();
 165:     if (XMLConstants.FEATURE_SECURE_PROCESSING.equals(name))
 166:       {
 167:         secureProcessing = true;
 168:         return;
 169:       }
 170:     throw new ParserConfigurationException(name);
 171:   }
 172: 
 173:   public boolean getFeature(String name)
 174:     throws ParserConfigurationException
 175:   {
 176:     if (XMLConstants.FEATURE_SECURE_PROCESSING.equals(name))
 177:       return secureProcessing;
 178:     throw new ParserConfigurationException(name);
 179:   }
 180: 
 181: }