hotspot/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.graph/src/org/graalvm/compiler/graph/DefaultNodeCollectionsProvider.java

/*
 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package org.graalvm.compiler.graph;

import java.util.Collections;
import java.util.IdentityHashMap;
import java.util.Map;
import java.util.Set;

import org.graalvm.compiler.api.collections.DefaultCollectionsProvider;

/**
 * A default implementation of {@link NodeCollectionsProvider} that creates standard JDK collection
 * class objects.
 */
public class DefaultNodeCollectionsProvider extends DefaultCollectionsProvider implements NodeCollectionsProvider {

    @Override
    public <E extends Node> Set<E> newNodeIdentitySet() {
        return Collections.newSetFromMap(newNodeIdentityMap());
    }

    @Override
    public <K extends Node, V> Map<K, V> newNodeIdentityMap() {
        return new IdentityHashMap<>();
    }

    @Override
    public <K extends Node, V> Map<K, V> newNodeIdentityMap(int expectedMaxSize) {
        return new IdentityHashMap<>(expectedMaxSize);
    }

    @Override
    public <K extends Node, V> Map<K, V> newNodeIdentityMap(Map<K, V> initFrom) {
        return new IdentityHashMap<>(initFrom);
    }
}