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Java implementation of the Sendmail Milter protocol.

There is a newer version: 0.8

/*
 * 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.nightcode.milter.util;

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

/**
 * Throwables helper class.
 */
public enum Throwables {
  ;

  public static Throwable getRootCause(Throwable throwable) {
    Throwable predecessor = throwable;
    Throwable cause;
    boolean movePredecessor = false;
    while ((cause = throwable.getCause()) != null) {
      if (cause == predecessor) {
        throw new IllegalStateException("loop in causal chain", cause);
      }
      if (movePredecessor) {
        predecessor = predecessor.getCause();
      }
      movePredecessor = !movePredecessor;
      throwable = cause;
    }
    return throwable;
  }

  public static String getStackTrace(Throwable throwable) {
    StringWriter out = new StringWriter();
    throwable.printStackTrace(new PrintWriter(out));
    return out.toString();
  }

  @SuppressWarnings("unchecked")
  public static  RuntimeException rethrow(Throwable throwable) throws T {
    throw (T) throwable;
  }
}