org.eclipse.xtend.expression.LoggingNullEvaluationHandler Maven / Gradle / Ivy
/*
* Copyright (c) Robert Bosch GmbH. All rights reserved.
*/
package org.eclipse.xtend.expression;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.eclipse.internal.xtend.expression.ast.SyntaxElement;
/**
* Logs null evaluation events to the log category of this class.
*
* The log level of the resulting message is configurable. By default messages will be logged with ERROR level.
*
* @author [email protected]
*
*/
public class LoggingNullEvaluationHandler implements NullEvaluationHandler {
private Log log = LogFactory.getLog(LoggingNullEvaluationHandler.class);
public enum Level {
OFF, TRACE, DEBUG, INFO, WARN, ERROR, FATAL
}
private Level level = Level.ERROR;
/**
* {@inheritDoc}
*/
public Object handleNullEvaluation(final SyntaxElement element, final ExecutionContext ctx) {
if (isLevelEnabled()) {
final CharSequence msg = buildMessage(element, ctx);
switch (level) {
case FATAL:
log.fatal(msg);
break;
case ERROR:
log.error(msg);
break;
case WARN:
log.warn(msg);
break;
case INFO:
log.info(msg);
break;
case DEBUG:
log.debug(msg);
break;
case TRACE:
log.trace(msg);
break;
default:
break;
}
}
return null;
}
private boolean isLevelEnabled() {
switch (level) {
case FATAL:
return log.isFatalEnabled();
case ERROR:
return log.isErrorEnabled();
case WARN:
return log.isWarnEnabled();
case INFO:
return log.isInfoEnabled();
case DEBUG:
return log.isDebugEnabled();
case TRACE:
return log.isTraceEnabled();
default:
return false;
}
}
/**
* Changes the log category.
*
* @param category
* Logger category
*/
public void setLogCategory(final String category) {
log = LogFactory.getLog(category);
}
/**
* Set log level for messages.
*
* @param level
* The level
*/
public void setLevel(final Level level) {
this.level = level;
}
/**
* Build the error message.
*
* @param element
* Current {@link SyntaxElement} that raised the Null Evaluation
* @param ctx
* Current context
* @return Error message
*/
protected CharSequence buildMessage(final SyntaxElement element, final ExecutionContext ctx) {
StringBuilder msg = new StringBuilder();
msg.append("null evaluation in ").append(element.getFileName()).append(" on line ").append(element.getLine()).append(" '").append(element)
.append("'");
return msg;
}
}