org.mycore.common.xsl.MCRErrorListener Maven / Gradle / Ivy
/*
* This file is part of *** M y C o R e ***
* See http://www.mycore.de/ for details.
*
* MyCoRe is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* MyCoRe is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with MyCoRe. If not, see .
*/
package org.mycore.common.xsl;
import javax.xml.transform.ErrorListener;
import javax.xml.transform.SourceLocator;
import javax.xml.transform.TransformerException;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.xml.utils.WrappedRuntimeException;
/**
* @author Thomas Scheffler (yagee)
*
*/
public class MCRErrorListener implements ErrorListener {
private static Logger LOGGER = LogManager.getLogger(MCRErrorListener.class);
private TransformerException exceptionThrown;
private String lastMessage;
public static MCRErrorListener getInstance() {
return new MCRErrorListener();
}
private MCRErrorListener() {
this.exceptionThrown = null;
}
public TransformerException getExceptionThrown() {
return exceptionThrown;
}
private boolean triggerException(TransformerException e) {
if (exceptionThrown != null) {
return false;
} else {
exceptionThrown = e;
return true;
}
}
/* (non-Javadoc)
* @see javax.xml.transform.ErrorListener#warning(javax.xml.transform.TransformerException)
*/
@Override
public void warning(TransformerException exception) throws TransformerException {
exception = unwrapException(exception);
StackTraceElement[] stackTrace = exception.getStackTrace();
if (stackTrace.length > 0 && stackTrace[0].getMethodName().equals("message")) {
//org.apache.xalan.transformer.MsgMgr.message to print a message
String messageAndLocation = getMyMessageAndLocation(exception);
this.lastMessage = messageAndLocation;
LOGGER.info(messageAndLocation);
} else {
LOGGER.warn("Exception while XSL transformation:{}", exception.getMessageAndLocation());
}
}
/* (non-Javadoc)
* @see javax.xml.transform.ErrorListener#error(javax.xml.transform.TransformerException)
*/
@Override
public void error(TransformerException exception) throws TransformerException {
exception = unwrapException(exception);
if (triggerException(exception)) {
LOGGER.error("Exception while XSL transformation:{}", exception.getMessageAndLocation());
}
throw exception;
}
/* (non-Javadoc)
* @see javax.xml.transform.ErrorListener#fatalError(javax.xml.transform.TransformerException)
*/
@Override
public void fatalError(TransformerException exception) throws TransformerException {
exception = unwrapException(exception);
StackTraceElement[] stackTrace = exception.getStackTrace();
if (stackTrace.length > 0 && stackTrace[0].getMethodName().equals("execute")
&& stackTrace[0].getClassName().endsWith("ElemMessage")) {
LOGGER.debug("Original exception: ", exception);
exception = new TransformerException(lastMessage);
}
if (triggerException(exception)) {
LOGGER.fatal("Exception while XSL transformation.", exception);
}
throw exception;
}
public static TransformerException unwrapException(TransformerException exception) {
Throwable cause = exception.getCause();
while (cause != null) {
if (cause instanceof TransformerException) {
return unwrapException((TransformerException) cause);
}
if (cause instanceof WrappedRuntimeException) {
cause = ((WrappedRuntimeException) cause).getException();
} else {
cause = cause.getCause();
}
}
return exception;
}
public static String getMyMessageAndLocation(TransformerException exception) {
SourceLocator locator = exception.getLocator();
StringBuilder msg = new StringBuilder();
if (locator != null) {
String systemID = locator.getSystemId();
int line = locator.getLineNumber();
int col = locator.getColumnNumber();
if (systemID != null) {
msg.append("SystemID: ");
msg.append(systemID);
}
if (line != 0) {
msg.append(" [");
msg.append(line);
if (col != 0) {
msg.append(',');
msg.append(col);
}
msg.append("]");
}
}
msg.append(": ");
msg.append(exception.getMessage());
return msg.toString();
}
}