/*
* Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 David Berkman
*
* This file is part of the SmallMind Code Project.
*
* The SmallMind Code Project is free software, you can redistribute
* it and/or modify it under either, at your discretion...
*
* 1) The terms of GNU Affero General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at
* your option) any later version.
*
* ...or...
*
* 2) The terms of the Apache License, Version 2.0.
*
* The SmallMind Code Project 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 or Apache License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* and the Apache License along with the SmallMind Code Project. If not, see
* <http://www.gnu.org/licenses/> or <http://www.apache.org/licenses/LICENSE-2.0>.
*
* Additional permission under the GNU Affero GPL version 3 section 7
* ------------------------------------------------------------------
* If you modify this Program, or any covered work, by linking or
* combining it with other code, such other code is not for that reason
* alone subject to any of the requirements of the GNU Affero GPL
* version 3.
*/
package org.smallmind.nutsnbolts.lang;
public class StackTraceUtility {
public static String[] obtainStackTraceAsArray (Throwable throwable) {
return obtainStackTrace(new ArrayStackTraceAccumulator(), throwable).asArray();
}
public static String obtainStackTraceAsString (Throwable throwable) {
return obtainStackTrace(new StringStackTraceAccumulator(), throwable).toString();
}
private static <S extends StackTraceAccumulator> S obtainStackTrace (S accumulator, Throwable throwable) {
StackTraceElement[] prevStackTrace = null;
StringBuilder lineBuilder;
int repeatedElements;
lineBuilder = new StringBuilder();
do {
lineBuilder.append(prevStackTrace == null ? "Exception in thread " : "Caused by: ");
lineBuilder.append(throwable.getClass().getCanonicalName());
lineBuilder.append(": ");
lineBuilder.append(throwable.getMessage());
accumulator.append(lineBuilder);
lineBuilder.delete(0, lineBuilder.length());
for (StackTraceElement singleElement : throwable.getStackTrace()) {
if (prevStackTrace != null) {
if ((repeatedElements = findRepeatedStackElements(singleElement, prevStackTrace)) >= 0) {
lineBuilder.append(" ... ");
lineBuilder.append(repeatedElements);
lineBuilder.append(" more");
accumulator.append(lineBuilder);
lineBuilder.delete(0, lineBuilder.length());
break;
}
}
lineBuilder.append(" at ");
lineBuilder.append(singleElement);
accumulator.append(lineBuilder);
lineBuilder.delete(0, lineBuilder.length());
}
prevStackTrace = throwable.getStackTrace();
} while ((throwable = throwable.getCause()) != null);
return accumulator;
}
private static int findRepeatedStackElements (StackTraceElement singleElement, StackTraceElement[] prevStackTrace) {
for (int count = 0; count < prevStackTrace.length; count++) {
if (singleElement.equals(prevStackTrace[count])) {
return prevStackTrace.length - count;
}
}
return -1;
}
}