com.datastax.driver.core.ProtocolFeature Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of cassandra-driver-core Show documentation

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

There is a newer version: 4.0.0

Show newest version

/*
 * 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;

/** A listing of features that may or not apply to a given {@link ProtocolVersion}. */
enum ProtocolFeature {

  /**
   * The capability of updating a prepared statement if the result's metadata changes at runtime
   * (for example, if the query is a {@code SELECT *} and the table is altered).
   */
  PREPARED_METADATA_CHANGES,

  /** The capability of sending or receiving custom payloads. */
  CUSTOM_PAYLOADS,

  /** The capability of assigning client-generated timestamps to write requests. */
  CLIENT_TIMESTAMPS,

//
;

  /**
   * Determines whether or not the input version supports ths feature.
   *
   * @param version the version to test against.
   * @return true if supported, false otherwise.
   */
  boolean isSupportedBy(ProtocolVersion version) {
    switch (this) {
      case PREPARED_METADATA_CHANGES:
        return version == ProtocolVersion.V5;
      case CUSTOM_PAYLOADS:
        return version.compareTo(ProtocolVersion.V4) >= 0;
      case CLIENT_TIMESTAMPS:
        return version.compareTo(ProtocolVersion.V3) >= 0;
      default:
        return false;
    }
  }
}