1 /*

     2  * Copyright (c) 2017, 2017, 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 package org.graalvm.util;

    24 

    25 /**

    26  * Unmodifiable memory efficient map data structure.

    27  */

    28 public interface UnmodifiableEconomicMap<K, V> {

    29 

    30     V get(K key);

    31 

    32     default V get(K key, V defaultValue) {

    33         V v = get(key);

    34         if (v == null) {

    35             return defaultValue;

    36         }

    37         return v;

    38     }

    39 

    40     boolean containsKey(K key);

    41 

    42     int size();

    43 

    44     boolean isEmpty();

    45 

    46     Iterable<V> getValues();

    47 

    48     Iterable<K> getKeys();

    49 

    50     UnmodifiableMapCursor<K, V> getEntries();

    51 }