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 }