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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 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 com.datastax.driver.core.exceptions.DriverInternalError;
import java.util.HashMap;
import java.util.Map;

/** 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),
  READ_FAILURE(0x1300),
  FUNCTION_FAILURE(0x1400),
  WRITE_FAILURE(0x1500),

  // 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;
  }
}