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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);
    }
}