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.graph;
  24 
  25 import java.util.Collections;
  26 import java.util.IdentityHashMap;
  27 import java.util.Map;
  28 import java.util.Set;
  29 
  30 import org.graalvm.compiler.api.collections.DefaultCollectionsProvider;
  31 
  32 /**
  33  * A default implementation of {@link NodeCollectionsProvider} that creates standard JDK collection
  34  * class objects.
  35  */
  36 public class DefaultNodeCollectionsProvider extends DefaultCollectionsProvider implements NodeCollectionsProvider {
  37 
  38     @Override
  39     public <E extends Node> Set<E> newNodeIdentitySet() {
  40         return Collections.newSetFromMap(newNodeIdentityMap());
  41     }
  42 
  43     @Override
  44     public <K extends Node, V> Map<K, V> newNodeIdentityMap() {
  45         return new IdentityHashMap<>();
  46     }
  47 
  48     @Override
  49     public <K extends Node, V> Map<K, V> newNodeIdentityMap(int expectedMaxSize) {
  50         return new IdentityHashMap<>(expectedMaxSize);
  51     }
  52 
  53     @Override
  54     public <K extends Node, V> Map<K, V> newNodeIdentityMap(Map<K, V> initFrom) {
  55         return new IdentityHashMap<>(initFrom);
  56     }
  57 }