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57 package com.sun.org.apache.xerces.internal.util;
58
59 import com.sun.org.apache.xerces.internal.xni.parser.XMLErrorHandler;
60 import org.xml.sax.ErrorHandler JavaDoc;
61 import org.xml.sax.SAXException JavaDoc;
62 import org.xml.sax.SAXParseException JavaDoc;
63
64 /**
65  * Wraps {@link XMLErrorHandler} and make it look like a SAX {@link ErrorHandler}.
66  *
67  * <p>
68  * The derived class should override the {@link #getErrorHandler()} method
69  * so that it will return the correct {@link XMLErrorHandler} instance.
70  * This method will be called whenever an error/warning is found.
71  *
72  * <p>
73  * Experience shows that it is better to store the actual
74  * {@link XMLErrorHandler} in one place and looks up that variable,
75  * rather than copying it into every component that needs an error handler
76  * and update all of them whenever it is changed, IMO.
77  *
78  * @author
79  * Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
80  */
81 public abstract class ErrorHandlerProxy implements ErrorHandler {
82     
83     public void error(SAXParseException JavaDoc e) throws SAXException JavaDoc {
84         XMLErrorHandler eh = getErrorHandler();
85         if(eh instanceof ErrorHandlerWrapper) {
86             ((ErrorHandlerWrapper)eh).fErrorHandler.error(e);
87         }
88         eh.error("","",ErrorHandlerWrapper.createXMLParseException(e));
89         // if an XNIException is thrown, just let it go.
90 // REVISIT: is this OK? or should we try to wrap it into SAXException?
91 }
92
93     public void fatalError(SAXParseException JavaDoc e) throws SAXException JavaDoc {
94         XMLErrorHandler eh = getErrorHandler();
95         if(eh instanceof ErrorHandlerWrapper) {
96             ((ErrorHandlerWrapper)eh).fErrorHandler.fatalError(e);
97         }
98         eh.fatalError("","",ErrorHandlerWrapper.createXMLParseException(e));
99     }
100
101     public void warning(SAXParseException JavaDoc e) throws SAXException JavaDoc {
102         XMLErrorHandler eh = getErrorHandler();
103         if(eh instanceof ErrorHandlerWrapper) {
104             ((ErrorHandlerWrapper)eh).fErrorHandler.warning(e);
105         }
106         eh.warning("","",ErrorHandlerWrapper.createXMLParseException(e));
107     }
108
109     protected abstract XMLErrorHandler getErrorHandler();
110 }
111
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