author | martin |
Tue, 15 Sep 2015 21:56:04 -0700 | |
changeset 32649 | 2ee9017c7597 |
parent 25859 | 3317bb8137f4 |
child 34774 | 03b4e6dc367b |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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/* |
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* (C) Copyright Taligent, Inc. 1996, 1997 - All Rights Reserved |
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* (C) Copyright IBM Corp. 1996 - 1998 - All Rights Reserved |
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* |
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* The original version of this source code and documentation |
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* is copyrighted and owned by Taligent, Inc., a wholly-owned |
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* subsidiary of IBM. These materials are provided under terms |
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* of a License Agreement between Taligent and Sun. This technology |
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* is protected by multiple US and International patents. |
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* |
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* This notice and attribution to Taligent may not be removed. |
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* Taligent is a registered trademark of Taligent, Inc. |
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* |
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*/ |
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package sun.util.resources; |
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import java.util.Enumeration; |
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import java.util.HashMap; |
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import java.util.HashSet; |
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import java.util.Map; |
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import java.util.ResourceBundle; |
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import java.util.Set; |
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import sun.util.ResourceBundleEnumeration; |
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/** |
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* Subclass of <code>ResourceBundle</code> which mimics |
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* <code>ListResourceBundle</code>, but provides more hooks |
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* for specialized subclass behavior. For general description, |
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* see {@link java.util.ListResourceBundle}. |
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* <p> |
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* This class leaves handleGetObject non-final, and |
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* adds a method createMap which allows subclasses to |
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* use specialized Map implementations. |
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*/ |
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public abstract class OpenListResourceBundle extends ResourceBundle { |
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/** |
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* Sole constructor. (For invocation by subclass constructors, typically |
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* implicit.) |
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*/ |
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protected OpenListResourceBundle() { |
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} |
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// Implements java.util.ResourceBundle.handleGetObject; inherits javadoc specification. |
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@Override |
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protected Object handleGetObject(String key) { |
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if (key == null) { |
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throw new NullPointerException(); |
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} |
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loadLookupTablesIfNecessary(); |
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return lookup.get(key); // this class ignores locales |
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} |
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/** |
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* Implementation of ResourceBundle.getKeys. |
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*/ |
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@Override |
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public Enumeration<String> getKeys() { |
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ResourceBundle parentBundle = this.parent; |
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return new ResourceBundleEnumeration(handleKeySet(), |
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(parentBundle != null) ? parentBundle.getKeys() : null); |
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} |
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/** |
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* Returns a set of keys provided in this resource bundle, |
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* including no parents. |
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*/ |
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@Override |
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protected Set<String> handleKeySet() { |
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loadLookupTablesIfNecessary(); |
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return lookup.keySet(); |
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} |
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@Override |
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public Set<String> keySet() { |
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if (keyset != null) { |
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return keyset; |
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} |
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Set<String> ks = createSet(); |
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ks.addAll(handleKeySet()); |
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if (parent != null) { |
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ks.addAll(parent.keySet()); |
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} |
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synchronized (this) { |
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if (keyset == null) { |
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keyset = ks; |
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} |
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} |
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return keyset; |
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} |
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/** |
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* See ListResourceBundle class description. |
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*/ |
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protected abstract Object[][] getContents(); |
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/** |
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* Load lookup tables if they haven't been loaded already. |
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*/ |
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void loadLookupTablesIfNecessary() { |
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if (lookup == null) { |
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loadLookup(); |
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} |
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} |
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/** |
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* We lazily load the lookup hashtable. This function does the |
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* loading. |
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*/ |
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private void loadLookup() { |
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Object[][] contents = getContents(); |
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Map<String, Object> temp = createMap(contents.length); |
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for (int i = 0; i < contents.length; ++i) { |
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// key must be non-null String, value must be non-null |
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String key = (String) contents[i][0]; |
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Object value = contents[i][1]; |
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if (key == null || value == null) { |
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throw new NullPointerException(); |
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} |
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temp.put(key, value); |
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} |
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synchronized (this) { |
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if (lookup == null) { |
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lookup = temp; |
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} |
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} |
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} |
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/** |
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* Lets subclasses provide specialized Map implementations. |
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* Default uses HashMap. |
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*/ |
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protected <K, V> Map<K, V> createMap(int size) { |
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return new HashMap<>(size); |
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} |
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protected <E> Set<E> createSet() { |
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return new HashSet<>(); |
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} |
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private volatile Map<String, Object> lookup = null; |
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private volatile Set<String> keyset; |
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} |