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'databene commons' is an open source Java library by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.databene.commons;

/**
 * Provides Exception related utilities.
 * Created at 23.02.2009 13:13:19
 * @since 0.4.8
 * @author Volker Bergmann
 */

public class ExceptionUtil {

	public static Throwable getRootCause(Throwable t) {
		Throwable result = t;
		while (result.getCause() != null && result.getCause() != result) // Note: UnsupportedOperationException recurses to itself as cause
			result = result.getCause();
		return result;
	}
	
	/** Scans recursively through an Exception and its 'cause' chain and tells if a given Exception type is contained. 
	 * @param exceptionType the requested exception type
	 * @param exception the actual exception to examine
	 * @return true if the given Exception type was found */
	public static boolean containsException(Class exceptionType, Throwable exception) {
		do {
			if (exceptionType.isAssignableFrom(exception.getClass()))
				return true;
			exception = exception.getCause();
		} while (exception != null);
		return false;
	}
	
}