org.lsmp.djep.xjep
Class ErrorCatchingVisitor

java.lang.Object
  org.lsmp.djep.xjep.DoNothingVisitor
      org.lsmp.djep.xjep.ErrorCatchingVisitor

All Implemented Interfaces:

ParserVisitor

Direct Known Subclasses:

PrintVisitor

public abstract class ErrorCatchingVisitor
extends DoNothingVisitor

An abstract ParserVisitor which adds some useful error handling facilities. Visitors which require these facilities should extend this class. General format should be

  
        clearErrors();
        Object res = (Node) node.jjtAccept(this,data);
        if(hasErrors())
                throw new ParseException(getErrors());

Author:

Rich Morris Created on 19-Jun-2003

Constructor Summary

ErrorCatchingVisitor()

Method Summary

Object	acceptCatchingErrors(Node node, Object data) calls jjtAccept inside a try catch block, adding the error if necessary
void	addError(Exception e) Adds an error message to the list of errors.
void	clearErrors() Reset the list of errors.
Exception	getError() Returns the Exception or null if no error.
String	getErrorsMessage() Returns the error messages.
boolean	hasErrors() Are their any errors?

Methods inherited from class org.lsmp.djep.xjep.DoNothingVisitor

acceptChildrenAsArray, visit, visit, visit, visit, visit

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ErrorCatchingVisitor

public ErrorCatchingVisitor()

Method Detail

acceptCatchingErrors

public Object acceptCatchingErrors(Node node,
                                   Object data)

calls jjtAccept inside a try catch block, adding the error if necessary

clearErrors

public void clearErrors()

Reset the list of errors.

hasErrors

public boolean hasErrors()

Are their any errors?

addError

public void addError(Exception e)

Adds an error message to the list of errors.

getErrorsMessage

public String getErrorsMessage()

Returns the error messages.

getError

public Exception getError()

Returns the Exception or null if no error.