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Spock is a testing and specification framework for Java and Groovy applications. What makes it stand out from the crowd is its beautiful and highly expressive specification language. Thanks to its JUnit runner, Spock is compatible with most IDEs, build tools, and continuous integration servers. Spock is inspired from JUnit, jMock, RSpec, Groovy, Scala, Vulcans, and other fascinating life forms.

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/*
 * Copyright 2012 the original author or authors.
 *
 * 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 spock.util;

import org.spockframework.util.Assert;

import java.util.*;

public abstract class Exceptions {
  /**
   * Returns the innermost cause of the specified exception. If the specified exception
   * has no cause, the exception itself is returned.
   *
   * @param exception an exception
   *
   * @return the root cause of the exception
   */
  public static Throwable getRootCause(Throwable exception) {
    Assert.notNull(exception);
    return exception.getCause() == null ? exception : getRootCause(exception.getCause());
  }

  /**
   * Returns a list of all causes of the specified exception. The first element of the
   * returned list is the specified exception itself; the last element is its root cause.
   *
   * @param exception an exception
   *
   * @return the exception's cause chain
   */
  public static List getCauseChain(Throwable exception) {
    Assert.notNull(exception);
    List result = new ArrayList<>();
    collectCauseChain(exception, result);
    return result;
  }

  private static void collectCauseChain(Throwable exception, List collector) {
    if (exception == null) return;
    collector.add(exception);
    collectCauseChain(exception.getCause(), collector);
  }
}