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A driver for DataStax Enterprise (DSE) and Apache Cassandra 1.2+ clusters that works exclusively with the Cassandra Query Language version 3 (CQL3) and Cassandra's binary protocol, supporting DSE-specific features such as geospatial types, DSE Graph and DSE authentication.

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/*
 * Copyright DataStax, Inc.
 *
 * This software can be used solely with DataStax Enterprise. Please consult the license at
 * http://www.datastax.com/terms/datastax-dse-driver-license-terms
 */
package com.datastax.driver.core;

import com.datastax.driver.core.exceptions.DriverException;
import com.datastax.driver.core.exceptions.DriverInternalError;
import java.util.concurrent.ExecutionException;

class DriverThrowables {

  static RuntimeException propagateCause(ExecutionException e) {
    Throwable cause = e.getCause();

    if (cause instanceof Error) throw ((Error) cause);

    // We could just rethrow e.getCause(). However, the cause of the ExecutionException has likely
    // been
    // created on the I/O thread receiving the response. Which means that the stacktrace associated
    // with said cause will make no mention of the current thread. This is painful for say, finding
    // out which execute() statement actually raised the exception. So instead, we re-create the
    // exception.
    if (cause instanceof DriverException) throw ((DriverException) cause).copy();
    else throw new DriverInternalError("Unexpected exception thrown", cause);
  }
}