StackTraceHelper: convert stack traces to length-limited string

prism/src/common/StackTraceHelper.java

@@ -0,0 +1,69 @@
+//==============================================================================
+//	
+//	Copyright (c) 2018-
+//	Authors:
+//	* Joachim Klein <klein@tcs.inf.tu-dresden.de> (TU Dresden)
+//	
+//------------------------------------------------------------------------------
+//	
+//	This file is part of PRISM.
+//	
+//	PRISM is free software; you can redistribute it and/or modify
+//	it under the terms of the GNU General Public License as published by
+//	the Free Software Foundation; either version 2 of the License, or
+//	(at your option) any later version.
+//	
+//	PRISM 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 for more details.
+//	
+//	You should have received a copy of the GNU General Public License
+//	along with PRISM; if not, write to the Free Software Foundation,
+//	Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//	
+//==============================================================================
+
+package common;
+
+/** Helper class for converting stack traces to strings for output */
+public class StackTraceHelper
+{
+	/** Default limit for number of lines in a stack trace */
+	public static final int DEFAULT_STACK_TRACE_LIMIT = 25;
+
+	/**
+	 * Get a string representation of the stack trace for the Throwable
+	 * (up to the given limit of lines).
+	 * @param throwable the throwable
+	 * @param limit the limit
+	 */
+	public static String asString(Throwable throwable, int limit)
+	{
+		return asString(throwable.getStackTrace(), limit);
+	}
+
+	/**
+	 * Get a string representation of the stack trace for the given stack trace array
+	 * (up to the given limit of lines).
+	 * @param elements array of stack trace elements (zero-th element is top of stack)
+	 * @param limit the limit (0 = no limit)
+	 */
+	public static String asString(StackTraceElement[] elements, int limit)
+	{
+		StringBuilder sb = new StringBuilder();
+
+		int i = 0;
+		for (StackTraceElement element : elements) {
+			if (limit != 0 && i++ > limit) {
+				sb.append("    ....\n");
+				break;
+			}
+			sb.append("    at ");
+			sb.append(element);
+			sb.append("\n");
+		}
+
+		return sb.toString();
+	}
+}