juneau-core/juneau-marshall/src/main/java/org/apache/juneau/utils/StackTraceUtils.java

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// *  http://www.apache.org/licenses/LICENSE-2.0                                                                             *
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// ***************************************************************************************************************************
package org.apache.juneau.utils;

/**
 * Stack trace utility methods.
 */
public class StackTraceUtils {

	/**
	 * Calculates a 16-bit hash for the specified throwable based on it's stack trace.
	 *
	 * @param t The throwable to calculate the stack trace on.
	 * @param stopClass Optional stop class on which to stop calculation of a stack trace beyond when found.
	 * @return A calculated hash.
	 */
	public static int hash(Throwable t, String stopClass) {
		int i = 0;
		while (t != null) {
			for (StackTraceElement e : t.getStackTrace()) {
				if (e.getClassName().equals(stopClass))
					break;
				if (e.getClassName().indexOf('$') == -1)
					i ^= e.hashCode();
			}
			t = t.getCause();
		}
		return i;
	}
}