1 /*

     2  * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 package jdk.jfr.internal.consumer;

    25 

    26 import jdk.jfr.internal.Type;

    27 

    28 final class ConstantLookup {

    29     private final Type type;

    30     private ConstantMap current;

    31     private ConstantMap previous = ConstantMap.EMPTY;

    32 

    33     ConstantLookup(ConstantMap current, Type type) {

    34         this.current = current;

    35         this.type = type;

    36     }

    37 

    38     public Type getType() {

    39         return type;

    40     }

    41 

    42     public ConstantMap getLatestPool() {

    43         return current;

    44     }

    45 

    46     public void newPool() {

    47         previous = current;

    48         current = new ConstantMap(current.factory, current.name);

    49     }

    50 

    51     public Object getPreviousResolved(long key) {

    52         return previous.getResolved(key);

    53     }

    54 

    55     public Object getCurrentResolved(long key) {

    56         return current.getResolved(key);

    57     }

    58 

    59     public Object getCurrent(long key) {

    60         return current.get(key);

    61     }

    62 }