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Non-domain infrastructure code that is common to many Neo4j components.

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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [https://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.neo4j.cursor;

public class CursorValue {
    private boolean valid;
    private T t;

    public void set(T newT) {
        t = newT;
        valid = true;
    }

    public T get() {
        if (valid) {
            return t;
        }
        throw new IllegalStateException();
    }

    public void invalidate() {
        valid = false;
        t = null;
    }
}