ExceptionBuilder.java

/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2013, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.classic.corpus;

import java.io.IOException;
import java.util.Random;

public class ExceptionBuilder {

  static Throwable build(Random r, double nestingProbability) {
    double rn = r.nextDouble();
    boolean nested = false;
    if (rn < nestingProbability) {
      nested = true;
    }

    Throwable cause = null;
    if(nested) {
      cause = makeThrowable(r, null);
    } 
    return makeThrowable(r, cause);
  }

  private static Throwable makeThrowable(Random r, Throwable cause) {
    int exType = r.nextInt(4);
    switch(exType) {
    case 0: return new IllegalArgumentException("an illegal argument was passed", cause);
    case 1: return new Exception("this is a test", cause);
    // exType 2 is JMXProviderException (which is an IOException).
    // JMX not supported in Android, so use IOException.
    case 2: return new IOException("jmx provider exception error occured", cause);
    case 3: return new OutOfMemoryError("ran out of memory");
    }
    return null;
  }
  
}