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'rapiddweller Common' is an open source Java library forked from Databene Commons 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 com.rapiddweller.common;

import java.io.PrintWriter;
import java.io.StringWriter;

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

  /**
   * Gets root cause.
   *
   * @param t the t
   * @return the root cause
   */
  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;
  }

  /**
   * Stack trace to string string.
   *
   * @param throwable the throwable
   * @return the string
   */
  public static String stackTraceToString(Throwable throwable) {
    StringWriter sw = new StringWriter();
    PrintWriter pw = new PrintWriter(sw);
    throwable.printStackTrace(pw);
    return sw.toString();
  }
}