com.greenpepper.internal.ch.qos.logback.core.helpers.ThrowableToStringArray Maven / Gradle / Ivy
/**
* Logback: the reliable, generic, fast and flexible logging framework.
* Copyright (C) 1999-2015, QOS.ch. All rights reserved.
*
* This program and the accompanying materials are dual-licensed under
* either the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation
*
* or (per the licensee's choosing)
*
* under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation.
*/
package com.greenpepper.internal.com.greenpepper.internal.ch.qos.logback.core.helpers;
import java.util.LinkedList;
import java.util.List;
import com.greenpepper.internal.com.greenpepper.internal.ch.qos.logback.core.CoreConstants;
public class ThrowableToStringArray {
public static String[] convert(Throwable t) {
List strList = new LinkedList();
extract(strList, t, null);
return strList.toArray(new String[0]);
}
private static void extract(List strList, Throwable t,
StackTraceElement[] parentSTE) {
StackTraceElement[] ste = t.getStackTrace();
final int numberOfcommonFrames = findNumberOfCommonFrames(ste, parentSTE);
strList.add(formatFirstLine(t, parentSTE));
for (int i = 0; i < (ste.length - numberOfcommonFrames); i++) {
strList.add("\tat "+ste[i].toString());
}
if (numberOfcommonFrames != 0) {
strList.add("\t... "+numberOfcommonFrames + " common frames omitted");
}
Throwable cause = t.getCause();
if (cause != null) {
ThrowableToStringArray.extract(strList, cause, ste);
}
}
private static String formatFirstLine(Throwable t,
StackTraceElement[] parentSTE) {
String prefix = "";
if (parentSTE != null) {
prefix = CoreConstants.CAUSED_BY;
}
String result = prefix + t.getClass().getName();
if (t.getMessage() != null) {
result += ": " + t.getMessage();
}
return result;
}
private static int findNumberOfCommonFrames(StackTraceElement[] ste,
StackTraceElement[] parentSTE) {
if (parentSTE == null) {
return 0;
}
int steIndex = ste.length - 1;
int parentIndex = parentSTE.length - 1;
int count = 0;
while (steIndex >= 0 && parentIndex >= 0) {
if (ste[steIndex].equals(parentSTE[parentIndex])) {
count++;
} else {
break;
}
steIndex--;
parentIndex--;
}
return count;
}
}