src/jdk.jfr/share/classes/jdk/jfr/internal/consumer/ConstantLookup.java

/*
 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package jdk.jfr.internal.consumer;

import jdk.jfr.internal.Type;

final class ConstantLookup {
    private final Type type;
    private ConstantMap current;
    private ConstantMap previous = ConstantMap.EMPTY;

    ConstantLookup(ConstantMap current, Type type) {
        this.current = current;
        this.type = type;
    }

    public Type getType() {
        return type;
    }

    public ConstantMap getLatestPool() {
        return current;
    }

    public void newPool() {
        previous = current;
        current = new ConstantMap(current.factory, current.name);
    }

    public Object getPreviousResolved(long key) {
        return previous.getResolved(key);
    }

    public Object getCurrentResolved(long key) {
        return current.getResolved(key);
    }

    public Object getCurrent(long key) {
        return current.get(key);
    }
}