libjava/classpath/gnu/xml/validation/relaxng/RELAXNGSchemaFactory.java

   1 /* RelaxNGSchemaFactory.java --
   2    Copyright (C) 2006  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.validation.relaxng;
  39
  40 import java.io.IOException;
  41 import java.net.URL;
  42 import javax.xml.XMLConstants;
  43 import javax.xml.parsers.DocumentBuilder;
  44 import javax.xml.parsers.DocumentBuilderFactory;
  45 import javax.xml.parsers.ParserConfigurationException;
  46 import javax.xml.transform.Source;
  47 import javax.xml.transform.dom.DOMSource;
  48 import javax.xml.transform.stream.StreamSource;
  49 import javax.xml.validation.Schema;
  50 import javax.xml.validation.SchemaFactory;
  51 import org.w3c.dom.Document;
  52 import org.w3c.dom.Node;
  53 import org.w3c.dom.ls.LSResourceResolver;
  54 import org.xml.sax.ErrorHandler;
  55 import org.xml.sax.InputSource;
  56 import org.xml.sax.SAXException;
  57
  58 /**
  59  * Schema factory for RELAX NG grammars.
  60  *
  61  * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
  62  */
  63 public class RELAXNGSchemaFactory
  64   extends SchemaFactory
  65 {
  66
  67   LSResourceResolver resourceResolver;
  68   ErrorHandler errorHandler;
  69
  70   public LSResourceResolver getResourceResolver()
  71   {
  72     return resourceResolver;
  73   }
  74
  75   public void setResourceResolver(LSResourceResolver resourceResolver)
  76   {
  77     this.resourceResolver = resourceResolver;
  78   }
  79
  80   public ErrorHandler getErrorHandler()
  81   {
  82     return this.errorHandler;
  83   }
  84
  85   public void setErrorHandler(ErrorHandler errorHandler)
  86   {
  87     this.errorHandler = errorHandler;
  88   }
  89
  90   public boolean isSchemaLanguageSupported(String schemaLanguage)
  91   {
  92     return XMLConstants.RELAXNG_NS_URI.equals(schemaLanguage);
  93   }
  94
  95   public Schema newSchema()
  96     throws SAXException
  97   {
  98     // TODO
  99     throw new UnsupportedOperationException();
 100   }
 101
 102   public Schema newSchema(Source[] schemata)
 103     throws SAXException
 104   {
 105     if (schemata == null || schemata.length != 1)
 106       throw new IllegalArgumentException("must specify one source");
 107     // TODO multiple schemata
 108     // TODO compact syntax
 109     try
 110       {
 111         Document doc = getDocument(schemata[0]);
 112         FullSyntaxBuilder builder = new FullSyntaxBuilder();
 113         return builder.parse(doc);
 114       }
 115     catch (IOException e)
 116       {
 117         SAXException e2 = new SAXException(e.getMessage());
 118         e2.initCause(e);
 119         throw e2;
 120       }
 121   }
 122
 123   private static Document getDocument(Source source)
 124     throws SAXException, IOException
 125   {
 126     if (source instanceof DOMSource)
 127       {
 128         Node node = ((DOMSource) source).getNode();
 129         if (node != null && node instanceof Document)
 130           return (Document) node;
 131       }
 132     String url = source.getSystemId();
 133     try
 134       {
 135         InputSource input = new InputSource(url);
 136         if (source instanceof StreamSource)
 137           {
 138             StreamSource streamSource = (StreamSource) source;
 139             input.setByteStream(streamSource.getInputStream());
 140             input.setCharacterStream(streamSource.getReader());
 141           }
 142         if (input.getByteStream() == null &&
 143             input.getCharacterStream() == null &&
 144             url != null)
 145           input.setByteStream(new URL(url).openStream());
 146         DocumentBuilderFactory f = DocumentBuilderFactory.newInstance();
 147         f.setNamespaceAware(true);
 148         f.setCoalescing(true);
 149         f.setExpandEntityReferences(true);
 150         f.setIgnoringComments(true);
 151         f.setIgnoringElementContentWhitespace(true);
 152         DocumentBuilder b = f.newDocumentBuilder();
 153         return b.parse(input);
 154       }
 155     catch (ParserConfigurationException e)
 156       {
 157         SAXException e2 = new SAXException(e.getMessage());
 158         e2.initCause(e);
 159         throw e2;
 160       }
 161   }
 162
 163 }