1 /*
   2  * Copyright (c) 2014, 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.compiler.api.collections;
  24 
  25 import java.util.Collections;
  26 import java.util.IdentityHashMap;
  27 import java.util.Map;
  28 import java.util.Set;
  29 
  30 /**
  31  * A default implementation of {@link CollectionsProvider} that creates standard JDK collection
  32  * class objects.
  33  */
  34 public class DefaultCollectionsProvider implements CollectionsProvider {
  35 
  36     @Override
  37     public <E> Set<E> newIdentitySet() {
  38         return Collections.newSetFromMap(newIdentityMap());
  39     }
  40 
  41     @Override
  42     public <K, V> Map<K, V> newIdentityMap() {
  43         return new IdentityHashMap<>();
  44     }
  45 
  46     @Override
  47     public <K, V> Map<K, V> newIdentityMap(int expectedMaxSize) {
  48         return new IdentityHashMap<>(expectedMaxSize);
  49     }
  50 
  51     @Override
  52     public <K, V> Map<K, V> newIdentityMap(Map<K, V> initFrom) {
  53         return new IdentityHashMap<>(initFrom);
  54     }
  55 }