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Implementation of the Neo4j JDBC driver.

There is a newer version: 6.0.1

/*
 * Copyright (c) 2023-2024 "Neo4j,"
 * Neo4j Sweden AB [https://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * 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
 *
 *     https://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.neo4j.jdbc;

import java.sql.SQLWarning;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
import java.util.function.Consumer;

/**
 * A holder for mutable {@link SQLWarning SQL warnings}.
 *
 * @author Michael J. Simons
 */
class Warnings implements Consumer {

	private static final AtomicReferenceFieldUpdater UPDATER = AtomicReferenceFieldUpdater
		.newUpdater(Warnings.class, SQLWarning.class, "value");

	private volatile SQLWarning value;

	@Override
	public void accept(SQLWarning warning) {

		if (UPDATER.compareAndSet(this, null, warning)) {
			return;
		}

		this.value.setNextWarning(warning);
	}

	SQLWarning get() {
		return this.value;
	}

	void clear() {
		UPDATER.compareAndSet(this, this.value, null);
	}

}