XsdBinderLoggingErrorHandler


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