2362N/A * Copyright (c) 2003, 2008, Oracle and/or its affiliates. All rights reserved. 0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 0N/A * This code is free software; you can redistribute it and/or modify it 0N/A * under the terms of the GNU General Public License version 2 only, as 2362N/A * published by the Free Software Foundation. Oracle designates this 0N/A * particular file as subject to the "Classpath" exception as provided 2362N/A * by Oracle in the LICENSE file that accompanied this code. 0N/A * This code is distributed in the hope that it will be useful, but WITHOUT 0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 0N/A * version 2 for more details (a copy is included in the LICENSE file that 0N/A * accompanied this code). 0N/A * You should have received a copy of the GNU General Public License version 0N/A * 2 along with this work; if not, write to the Free Software Foundation, 0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 2362N/A * or visit www.oracle.com if you need additional information or have any 0N/A * Abstract class that maps Class objects to lazily-computed values of 0N/A * type V. A concrete subclass must implement the computeValue method 0N/A * to determine how the values are computed. 0N/A * The keys are only weakly reachable through this map, so this map 0N/A * does not prevent a class (along with its class loader, etc.) from 0N/A * being garbage collected if it is not otherwise strongly reachable. 0N/A * The values are only softly reachable through this map, so that the 0N/A * computed values generally persist while not otherwise strongly 0N/A * reachable, but their storage may be reclaimed if necessary. Also, 0N/A * note that if a key is strongly reachable from a value, then the key 0N/A * is effectively softly reachable through this map, which may delay 0N/A * garbage collection of classes (see 4429536). 0N/A * Use a mutable cell (a one-element list) to hold the soft 0N/A * reference to a value, to allow the lazy value computation 0N/A * to be synchronized with entry-level granularity instead of 0N/A * by locking the whole table.