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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 (C) 2012-2017 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;

/**
 * Identifies a PreparedStatement.
 */
public class PreparedId {

    // This class is mostly here to group PreparedStatement data that are needed for
    // execution but that we don't want to expose publicly (see JAVA-195)

    final int[] routingKeyIndexes;

    final ProtocolVersion protocolVersion;

    final PreparedMetadata boundValuesMetadata;

    // can change over time, see JAVA-1196, JAVA-420
    volatile PreparedMetadata resultSetMetadata;

    PreparedId(PreparedMetadata boundValuesMetadata, PreparedMetadata resultSetMetadata, int[] routingKeyIndexes, ProtocolVersion protocolVersion) {
        assert boundValuesMetadata != null;
        assert resultSetMetadata != null;
        this.boundValuesMetadata = boundValuesMetadata;
        this.resultSetMetadata = resultSetMetadata;
        this.routingKeyIndexes = routingKeyIndexes;
        this.protocolVersion = protocolVersion;
    }


    static class PreparedMetadata {

        final MD5Digest id;
        final ColumnDefinitions variables;

        PreparedMetadata(MD5Digest id, ColumnDefinitions variables) {
            this.id = id;
            this.variables = variables;
        }
    }
}