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A driver for Apache Cassandra 1.2+ that works exclusively with the Cassandra Query Language version 3 (CQL3) and Cassandra's binary protocol.

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/*
 *      Copyright (C) 2012 DataStax Inc.
 *
 *   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 com.datastax.driver.core;

import java.util.HashMap;
import java.util.Map;

import com.datastax.driver.core.exceptions.DriverInternalError;

/**
 * Exceptions code, as defined by the native protocol.
 */
enum ExceptionCode {

    SERVER_ERROR    (0x0000),
    PROTOCOL_ERROR  (0x000A),

    BAD_CREDENTIALS (0x0100),

    // 1xx: problem during request execution
    UNAVAILABLE     (0x1000),
    OVERLOADED      (0x1001),
    IS_BOOTSTRAPPING(0x1002),
    TRUNCATE_ERROR  (0x1003),
    WRITE_TIMEOUT   (0x1100),
    READ_TIMEOUT    (0x1200),

    // 2xx: problem validating the request
    SYNTAX_ERROR    (0x2000),
    UNAUTHORIZED    (0x2100),
    INVALID         (0x2200),
    CONFIG_ERROR    (0x2300),
    ALREADY_EXISTS  (0x2400),
    UNPREPARED      (0x2500);

    public final int value;
    private static final Map valueToCode = new HashMap(ExceptionCode.values().length);
    static {
        for (ExceptionCode code : ExceptionCode.values())
            valueToCode.put(code.value, code);
    }

    private ExceptionCode(int value) {
        this.value = value;
    }

    public static ExceptionCode fromValue(int value) {
        ExceptionCode code = valueToCode.get(value);
        if (code == null)
            throw new DriverInternalError(String.format("Unknown error code %d", value));
        return code;
    }
}