XsdBinderTerminatingErrorHandler


1   /**
2    * 
3    */
4   package org.jboss.xb.binding.sunday.unmarshalling;
5   
6   import org.jboss.xb.binding.JBossXBRuntimeException;
7   import org.w3c.dom.DOMError  ;
8   import org.w3c.dom.DOMErrorHandler  ;
9   import org.w3c.dom.DOMLocator  ;
10  
11  public class XsdBinderTerminatingErrorHandler implements DOMErrorHandler  
12  {
13     private static XsdBinderTerminatingErrorHandler errorHandler;
14  
15     // Hide constructor
16     private XsdBinderTerminatingErrorHandler()
17     {
18     }
19     
20     public static XsdBinderTerminatingErrorHandler newInstance()
21     {
22        if (errorHandler == null)
23        {
24           errorHandler = new XsdBinderTerminatingErrorHandler();
25        }
26        return errorHandler;
27     }
28  
29     public boolean handleError(DOMError   error)
30     {
31        // todo: i do throw exceptions here instead of returning false to stop parsing immediately
32        // since returning false seems to be no different from true (a bug in the parser?)
33        // Although, throwing an exception reports the same error twice but the second time with
34        // location -1:-1
35        switch(error.getSeverity())
36        {
37           case DOMError.SEVERITY_ERROR:
38              throw new JBossXBRuntimeException(formatMessage(error));
39           case DOMError.SEVERITY_FATAL_ERROR:
40              throw new JBossXBRuntimeException(formatMessage(error));
41           case DOMError.SEVERITY_WARNING:
42              XsdBinder.log.warn(formatMessage(error));
43              break;
44        }
45        return false;
46     }
47  
48     String   formatMessage(DOMError   error)
49     {
50        StringBuffer   buf = new StringBuffer  ();
51        DOMLocator   location = error.getLocation();
52        if(location != null)
53        {
54           buf.append(location.getLineNumber())
55              .append(':')
56              .append(location.getColumnNumber());
57        }
58        else
59        {
60           buf.append("[location unavailable]");
61        }
62  
63        buf.append(' ').append(error.getMessage());
64        return buf.toString();
65     }
66  }
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