streams/src/main/java/org/apache/kafka/streams/query/internals/InternalQueryResultUtil.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.kafka.streams.query.internals;

import org.apache.kafka.common.annotation.InterfaceStability.Unstable;
import org.apache.kafka.streams.query.QueryResult;

/**
 * Internal utility class to support operations the Kafka Streams framework needs to
 * perform on {@link QueryResult}s.
 */
@Unstable
public final class InternalQueryResultUtil {
    // uninstantiable utility class
    public InternalQueryResultUtil() {}

    /**
     * Creates a new `QueryResult` preserving the execution info
     * and position of the provided result.
     */
    public static <R> QueryResult<R> copyAndSubstituteDeserializedResult(
        final QueryResult<?> rawResult,
        final R deserializedResult) {

        if (rawResult.isFailure()) {
            throw new IllegalArgumentException(
                "Callers must avoid calling this method on a failed result."
            );
        } else {
            return new SucceededQueryResult<>(
                deserializedResult,
                rawResult.getExecutionInfo(),
                rawResult.getPosition()
            );
        }
    }
}