/**
* Logback: the generic, reliable, fast and flexible logging framework.
*
* Copyright (C) 1999-2006, QOS.ch
*
* This library is free software, you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation.
*/
package ch.qos.logback.classic.pattern;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import ch.qos.logback.classic.spi.LoggingEvent;
import ch.qos.logback.classic.spi.ThrowableDataPoint;
import ch.qos.logback.classic.spi.ThrowableProxy;
import ch.qos.logback.core.Context;
import ch.qos.logback.core.CoreConstants;
import ch.qos.logback.core.boolex.EvaluationException;
import ch.qos.logback.core.boolex.EventEvaluator;
import ch.qos.logback.core.status.ErrorStatus;
/**
* Add a stack trace in case the event contains a Throwable.
*
* @author Ceki Gülcü
*/
public class ThrowableProxyConverter extends ThrowableHandlingConverter {
int lengthOption;
List<EventEvaluator> evaluatorList = null;
final int MAX_ERROR_COUNT = 4;
int errorCount = 0;
public void start() {
String lengthStr = getFirstOption();
if (lengthStr == null) {
lengthOption = Integer.MAX_VALUE;
} else {
lengthStr = lengthStr.toLowerCase();
if ("full".equals(lengthStr)) {
lengthOption = Integer.MAX_VALUE;
} else if ("short".equals(lengthStr)) {
lengthOption = 2;
} else {
try {
// we add one because, printing starts at offset 1
lengthOption = Integer.parseInt(lengthStr) + 1;
} catch (NumberFormatException nfe) {
addError("Could not parser [" + lengthStr + " as an integer");
lengthOption = Integer.MAX_VALUE;
}
}
}
final List optionList = getOptionList();
if (optionList != null && optionList.size() > 1) {
final int optionListSize = optionList.size();
for (int i = 1; i < optionListSize; i++) {
String evaluatorStr = (String) optionList.get(i);
Context context = getContext();
Map evaluatorMap = (Map) context.getObject(CoreConstants.EVALUATOR_MAP);
EventEvaluator ee = (EventEvaluator) evaluatorMap.get(evaluatorStr);
addEvaluator(ee);
}
}
super.start();
}
private void addEvaluator(EventEvaluator ee) {
if (evaluatorList == null) {
evaluatorList = new ArrayList<EventEvaluator>();
}
evaluatorList.add(ee);
}
public void stop() {
evaluatorList = null;
super.stop();
}
protected void extraData(StringBuilder builder, ThrowableDataPoint tdp) {
// nop
}
protected void prepareLoggingEvent(LoggingEvent event) {
// nop
}
public String convert(LoggingEvent event) {
StringBuilder buf = new StringBuilder(32);
ThrowableProxy information = event.getThrowableProxy();
if (information == null) {
return CoreConstants.EMPTY_STRING;
}
ThrowableDataPoint[] tdpArray = information.getThrowableDataPointArray();
int length = (lengthOption > tdpArray.length) ? tdpArray.length
: lengthOption;
// an evaluator match will cause stack printing to be skipped
if (evaluatorList != null) {
boolean printStack = true;
for (int i = 0; i < evaluatorList.size(); i++) {
EventEvaluator ee = (EventEvaluator) evaluatorList.get(i);
try {
if (ee.evaluate(event)) {
printStack = false;
break;
}
} catch (EvaluationException eex) {
errorCount++;
if (errorCount < MAX_ERROR_COUNT) {
addError("Exception thrown for evaluator named [" + ee.getName()
+ "]", eex);
} else if (errorCount == MAX_ERROR_COUNT) {
ErrorStatus errorStatus = new ErrorStatus(
"Exception thrown for evaluator named [" + ee.getName() + "].",
this, eex);
errorStatus.add(new ErrorStatus("This was the last warning about this evaluator's errors." +
"We don't want the StatusManager to get flooded.", this));
addStatus(errorStatus);
}
}
}
if (!printStack) {
return CoreConstants.EMPTY_STRING;
}
}
prepareLoggingEvent(event);
buf.append(tdpArray[0]).append(CoreConstants.LINE_SEPARATOR);
for (int i = 1; i < length; i++) {
String string = tdpArray[i].toString();
buf.append(string);
extraData(buf, tdpArray[i]); // allow other data to be appended
buf.append(CoreConstants.LINE_SEPARATOR);
}
return buf.toString();
}
}