1/* 2 * Copyright (c) 2015, 2015, 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 */ 23package org.graalvm.compiler.graph; 24 25import java.util.Map; 26import java.util.function.Consumer; 27 28/** 29 * This class is a container of a graph that needs to be readonly and optionally a lazily created 30 * mutable copy of the graph. 31 */ 32public final class CachedGraph<G extends Graph> { 33 34 private final G readonlyCopy; 35 private G mutableCopy; 36 37 private CachedGraph(G readonlyCopy, G mutableCopy) { 38 this.readonlyCopy = readonlyCopy; 39 this.mutableCopy = mutableCopy; 40 } 41 42 public static <G extends Graph> CachedGraph<G> fromReadonlyCopy(G graph) { 43 return new CachedGraph<>(graph, null); 44 } 45 46 public static <G extends Graph> CachedGraph<G> fromMutableCopy(G graph) { 47 return new CachedGraph<>(graph, graph); 48 } 49 50 public G getReadonlyCopy() { 51 if (hasMutableCopy()) { 52 return mutableCopy; 53 } 54 return readonlyCopy; 55 } 56 57 public boolean hasMutableCopy() { 58 return mutableCopy != null; 59 } 60 61 @SuppressWarnings("unchecked") 62 public G getMutableCopy(Consumer<Map<Node, Node>> duplicationMapCallback) { 63 if (!hasMutableCopy()) { 64 mutableCopy = (G) readonlyCopy.copy(duplicationMapCallback); 65 } 66 return mutableCopy; 67 } 68} 69