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.ThrowableInformation;
import ch.qos.logback.core.Context;
import ch.qos.logback.core.CoreGlobal;
import ch.qos.logback.core.boolex.EvaluationException;
import ch.qos.logback.core.boolex.EventEvaluator;
/**
* Add a stack trace i case the event contains a Throwable.
*
* @author Ceki Gülcü
*/
public class ThrowableInformationConverter extends ThrowableHandlingConverter {
int lengthOption;
List<EventEvaluator> evaluatorList = null;
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(CoreGlobal.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();
}
public String convert(Object event) {
StringBuffer buf = new StringBuffer(32);
LoggingEvent le = (LoggingEvent) event;
ThrowableInformation information = le.getThrowableInformation();
if (information == null) {
return CoreGlobal.EMPTY_STRING;
}
String[] stringRep = information.getThrowableStrRep();
int length = (lengthOption > stringRep.length) ? stringRep.length : lengthOption;
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) {
addError("Exception thrown for evaluator named ["+ee.getName()+"]", eex);
}
}
if (!printStack) {
return CoreGlobal.EMPTY_STRING;
}
}
buf.append(stringRep[0]).append(CoreGlobal.LINE_SEPARATOR);
for (int i = 1; i < length; i++) {
String string = stringRep[i];
if (string.startsWith(ch.qos.logback.classic.ClassicGlobal.CAUSED_BY)) {
// nothing
} else if (Character.isDigit(string.charAt(0))) {
buf.append("\t... ");
} else {
buf.append("\tat ");
}
buf.append(string).append(CoreGlobal.LINE_SEPARATOR);
}
return buf.toString();
}
}