src/edu/internet2/middleware/shibboleth/common/XML.java

   1 package edu.internet2.middleware.shibboleth.common;
   2
   3 import java.io.ByteArrayInputStream;
   4 import java.io.InputStream;
   5 import org.xml.sax.EntityResolver;
   6 import org.xml.sax.InputSource;
   7 import org.xml.sax.SAXException;
   8
   9 /**
  10  *  Utility class for XML constants and schema handling
  11  *
  12  * @author     Scott Cantor
  13  * @created    January 2, 2002
  14  */
  15 public class XML
  16 {
  17     /**  Shibboleth extension XML namespace */
  18     public final static String SHIB_NS = "urn:mace:shibboleth:1.0";
  19
  20     /**  Shibboleth XML schema identifier */
  21     public final static String SHIB_SCHEMA_ID = "shibboleth.xsd";
  22
  23     private static byte[] Shib_schema;
  24
  25     /**
  26      *  Custom schema resolver class
  27      *
  28      * @author     Scott Cantor
  29      * @created    May 18, 2002
  30      */
  31     protected static class SchemaResolver implements EntityResolver
  32     {
  33         /**
  34          *  A customized entity resolver for the Shibboleth extension schema
  35          *
  36          * @param  publicId                 The public identifier of the entity
  37          * @param  systemId                 The system identifier of the entity
  38          * @return                          A source of bytes for the entity or
  39          *      null
  40          * @exception  SAXException         Raised if an XML parsing problem
  41          *      occurs
  42          * @exception  java.io.IOException  Raised if an I/O problem is detected
  43          */
  44         public InputSource resolveEntity(String publicId, String systemId)
  45             throws SAXException, java.io.IOException
  46         {
  47             InputSource src = null;
  48             if (systemId.endsWith('/' + SHIB_SCHEMA_ID) && Shib_schema != null)
  49                 src = new InputSource(new ByteArrayInputStream(Shib_schema));
  50             return src;
  51         }
  52     }
  53
  54     static
  55     {
  56         try
  57         {
  58             StringBuffer buf = new StringBuffer(1024);
  59             InputStream xmlin = XML.class.getResourceAsStream("/schemas/" + SHIB_SCHEMA_ID);
  60             if (xmlin == null)
  61                 throw new RuntimeException("XML static initializer unable to locate Shibboleth schema");
  62             else
  63             {
  64                 int b;
  65                 while ((b = xmlin.read()) != -1)
  66                     buf.append((char)b);
  67                 Shib_schema = buf.toString().getBytes();
  68                 xmlin.close();
  69             }
  70         }
  71         catch (java.io.IOException e)
  72         {
  73             throw new RuntimeException("XML static initializer caught an I/O error");
  74         }
  75     }
  76 }
  77