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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;

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

  /** The capability of setting keyspace on a per-query basis. */
  KEYSPACE_ON_QUERY,

  /**
   * 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 KEYSPACE_ON_QUERY:
        return version == ProtocolVersion.V5 || version == ProtocolVersion.DSE_V2;
      case PREPARED_METADATA_CHANGES:
        return version == ProtocolVersion.V5 || version == ProtocolVersion.DSE_V2;
      case CUSTOM_PAYLOADS:
        return version.compareTo(ProtocolVersion.V4) >= 0;
      case CLIENT_TIMESTAMPS:
        return version.compareTo(ProtocolVersion.V3) >= 0;
      default:
        return false;
    }
  }
}