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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.
/*
* 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;
}
}