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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;

/**
 * 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;
        }
    }
}