jdk/src/java.base/share/classes/java/util/PropertyResourceBundle.java
author nishjain
Sun, 18 Sep 2016 23:09:37 +0900
changeset 40985 69efd667068d
parent 37781 71ed5645f17c
child 41606 7b34be6ae552
permissions -rw-r--r--
8165984: ResourceBundle lookup fields not completely thread-safe Reviewed-by: okutsu, naoto
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/*
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 * Copyright (c) 1996, 2016, 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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package java.util;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.Reader;
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import java.io.IOException;
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import java.nio.charset.MalformedInputException;
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import java.nio.charset.StandardCharsets;
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import java.nio.charset.UnmappableCharacterException;
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import sun.security.action.GetPropertyAction;
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import sun.util.PropertyResourceBundleCharset;
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import sun.util.ResourceBundleEnumeration;
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/**
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 * <code>PropertyResourceBundle</code> is a concrete subclass of
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 * <code>ResourceBundle</code> that manages resources for a locale
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 * using a set of static strings from a property file. See
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 * {@link ResourceBundle ResourceBundle} for more information about resource
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 * bundles.
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 *
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 * <p>
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 * Unlike other types of resource bundle, you don't subclass
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 * <code>PropertyResourceBundle</code>.  Instead, you supply properties
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 * files containing the resource data.  <code>ResourceBundle.getBundle</code>
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 * will automatically look for the appropriate properties file and create a
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 * <code>PropertyResourceBundle</code> that refers to it. See
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 * {@link ResourceBundle#getBundle(java.lang.String, java.util.Locale, java.lang.ClassLoader) ResourceBundle.getBundle}
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 * for a complete description of the search and instantiation strategy.
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 *
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 * <p>
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 * The following <a name="sample">example</a> shows a member of a resource
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 * bundle family with the base name "MyResources".
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 * The text defines the bundle "MyResources_de",
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 * the German member of the bundle family.
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 * This member is based on <code>PropertyResourceBundle</code>, and the text
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 * therefore is the content of the file "MyResources_de.properties"
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 * (a related <a href="ListResourceBundle.html#sample">example</a> shows
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 * how you can add bundles to this family that are implemented as subclasses
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 * of <code>ListResourceBundle</code>).
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 * The keys in this example are of the form "s1" etc. The actual
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 * keys are entirely up to your choice, so long as they are the same as
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 * the keys you use in your program to retrieve the objects from the bundle.
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 * Keys are case-sensitive.
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 * <blockquote>
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 * <pre>
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 * # MessageFormat pattern
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 * s1=Die Platte \"{1}\" enth&auml;lt {0}.
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 *
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 * # location of {0} in pattern
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 * s2=1
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 *
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 * # sample disk name
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 * s3=Meine Platte
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 *
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 * # first ChoiceFormat choice
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 * s4=keine Dateien
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 *
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 * # second ChoiceFormat choice
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 * s5=eine Datei
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 *
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 * # third ChoiceFormat choice
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 * s6={0,number} Dateien
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 *
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 * # sample date
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 * s7=3. M&auml;rz 1996
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 * </pre>
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 * </blockquote>
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 *
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 * <p>
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 * The implementation of a {@code PropertyResourceBundle} subclass must be
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 * thread-safe if it's simultaneously used by multiple threads. The default
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 * implementations of the non-abstract methods in this class are thread-safe.
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 *
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 * <p>
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 * <strong>Note:</strong> PropertyResourceBundle can be constructed either
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 * from an InputStream or a Reader, which represents a property file.
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 * Constructing a PropertyResourceBundle instance from an InputStream requires
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 * that the input stream be encoded in UTF-8. By default, if a
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 * {@link java.nio.charset.MalformedInputException} or an
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 * {@link java.nio.charset.UnmappableCharacterException} occurs on reading the
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 * input stream, then the PropertyResourceBundle instance resets to the state
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 * before the exception, re-reads the input stream in {@code ISO-8859-1}, and
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 * continues reading. If the system property
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 * {@code java.util.PropertyResourceBundle.encoding} is set to either
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 * "ISO-8859-1" or "UTF-8", the input stream is solely read in that encoding,
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 * and throws the exception if it encounters an invalid sequence.
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 * If "ISO-8859-1" is specified, characters that cannot be represented in
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 * ISO-8859-1 encoding must be represented by Unicode Escapes as defined in section
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 * 3.3 of <cite>The Java&trade; Language Specification</cite>
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 * whereas the other constructor which takes a Reader does not have that limitation.
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 * Other encoding values are ignored for this system property.
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 *
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 * @see ResourceBundle
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 * @see ListResourceBundle
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 * @see Properties
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 * @since 1.1
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 */
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public class PropertyResourceBundle extends ResourceBundle {
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    // Check whether the strict encoding is specified.
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    // The possible encoding is either "ISO-8859-1" or "UTF-8".
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    private static final String encoding = GetPropertyAction
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        .privilegedGetProperty("java.util.PropertyResourceBundle.encoding", "")
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        .toUpperCase(Locale.ROOT);
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    /**
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     * Creates a property resource bundle from an {@link java.io.InputStream
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    * InputStream}. This constructor reads the property file in UTF-8 by default.
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    * If a {@link java.nio.charset.MalformedInputException} or an
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    * {@link java.nio.charset.UnmappableCharacterException} occurs on reading the
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    * input stream, then the PropertyResourceBundle instance resets to the state
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    * before the exception, re-reads the input stream in {@code ISO-8859-1} and
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    * continues reading. If the system property
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    * {@code java.util.PropertyResourceBundle.encoding} is set to either
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    * "ISO-8859-1" or "UTF-8", the input stream is solely read in that encoding,
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    * and throws the exception if it encounters an invalid sequence. Other
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    * encoding values are ignored for this system property.
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     *
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     * @param stream an InputStream that represents a property file
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     *        to read from.
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     * @throws IOException if an I/O error occurs
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     * @throws NullPointerException if <code>stream</code> is null
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     * @throws IllegalArgumentException if {@code stream} contains a
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     *     malformed Unicode escape sequence.
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     * @throws MalformedInputException if the system property
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     *     {@code java.util.PropertyResourceBundle.encoding} is set to "UTF-8"
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     *     and {@code stream} contains an invalid UTF-8 byte sequence.
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     * @throws UnmappableCharacterException if the system property
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     *     {@code java.util.PropertyResourceBundle.encoding} is set to "UTF-8"
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     *     and {@code stream} contains an unmappable UTF-8 byte sequence.
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     */
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    @SuppressWarnings({"unchecked", "rawtypes"})
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    public PropertyResourceBundle (InputStream stream) throws IOException {
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        this(new InputStreamReader(stream,
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            "ISO-8859-1".equals(encoding) ?
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                StandardCharsets.ISO_8859_1.newDecoder() :
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                new PropertyResourceBundleCharset("UTF-8".equals(encoding)).newDecoder()));
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    }
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    /**
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     * Creates a property resource bundle from a {@link java.io.Reader
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     * Reader}.  Unlike the constructor
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     * {@link #PropertyResourceBundle(java.io.InputStream) PropertyResourceBundle(InputStream)},
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     * there is no limitation as to the encoding of the input property file.
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     *
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     * @param reader a Reader that represents a property file to
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     *        read from.
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     * @throws IOException if an I/O error occurs
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     * @throws NullPointerException if <code>reader</code> is null
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     * @throws IllegalArgumentException if a malformed Unicode escape sequence appears
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     *     from {@code reader}.
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     * @since 1.6
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     */
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    @SuppressWarnings({"unchecked", "rawtypes"})
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    public PropertyResourceBundle (Reader reader) throws IOException {
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        Properties properties = new Properties();
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        properties.load(reader);
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        lookup = new HashMap(properties);
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    }
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    // Implements java.util.ResourceBundle.handleGetObject; inherits javadoc specification.
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    public 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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        return lookup.get(key);
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    }
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    /**
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     * Returns an <code>Enumeration</code> of the keys contained in
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     * this <code>ResourceBundle</code> and its parent bundles.
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     *
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     * @return an <code>Enumeration</code> of the keys contained in
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     *         this <code>ResourceBundle</code> and its parent bundles.
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     * @see #keySet()
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     */
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    public Enumeration<String> getKeys() {
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        ResourceBundle parent = this.parent;
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        return new ResourceBundleEnumeration(lookup.keySet(),
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                (parent != null) ? parent.getKeys() : null);
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    }
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    /**
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     * Returns a <code>Set</code> of the keys contained
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     * <em>only</em> in this <code>ResourceBundle</code>.
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     *
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     * @return a <code>Set</code> of the keys contained only in this
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     *         <code>ResourceBundle</code>
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     * @since 1.6
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     * @see #keySet()
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     */
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    protected Set<String> handleKeySet() {
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        return lookup.keySet();
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    }
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    // ==================privates====================
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    private final Map<String,Object> lookup;
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}