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   * Copyright (c) 1996, 2013, 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.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * 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.
   */
  
  /*
   * (C) Copyright Taligent, Inc. 1996, 1997 - All Rights Reserved
   * (C) Copyright IBM Corp. 1996 - 1998 - All Rights Reserved
   *
   * The original version of this source code and documentation
   * is copyrighted and owned by Taligent, Inc., a wholly-owned
   * subsidiary of IBM. These materials are provided under terms
   * of a License Agreement between Taligent and Sun. This technology
   * is protected by multiple US and International patents.
   *
   * This notice and attribution to Taligent may not be removed.
   * Taligent is a registered trademark of Taligent, Inc.
   */
  
  package java.util;
  
  import java.io.InputStream;
  import java.io.Reader;
  import java.io.IOException;
  import sun.util.ResourceBundleEnumeration;
  
  /**
   * <code>PropertyResourceBundle</code> is a concrete subclass of
   * <code>ResourceBundle</code> that manages resources for a locale
   * using a set of static strings from a property file. See
   * {@link ResourceBundle ResourceBundle} for more information about resource
   * bundles.
   *
   * <p>
   * Unlike other types of resource bundle, you don't subclass
   * <code>PropertyResourceBundle</code>.  Instead, you supply properties
   * files containing the resource data.  <code>ResourceBundle.getBundle</code>
   * will automatically look for the appropriate properties file and create a
   * <code>PropertyResourceBundle</code> that refers to it. See
   * {@link ResourceBundle#getBundle(String, Locale, ClassLoader) ResourceBundle.getBundle}
   * for a complete description of the search and instantiation strategy.
   *
   * <p>
   * The following <a name="sample">example</a> shows a member of a resource
   * bundle family with the base name "MyResources".
   * The text defines the bundle "MyResources_de",
   * the German member of the bundle family.
   * This member is based on <code>PropertyResourceBundle</code>, and the text
   * therefore is the content of the file "MyResources_de.properties"
   * (a related <a href="ListResourceBundle.html#sample">example</a> shows
   * how you can add bundles to this family that are implemented as subclasses
   * of <code>ListResourceBundle</code>).
   * The keys in this example are of the form "s1" etc. The actual
   * keys are entirely up to your choice, so long as they are the same as
   * the keys you use in your program to retrieve the objects from the bundle.
   * Keys are case-sensitive.
   * <blockquote>
   * <pre>
   * # MessageFormat pattern
   * s1=Die Platte \"{1}\" enth&auml;lt {0}.
   *
   * # location of {0} in pattern
   * s2=1
   *
   * # sample disk name
   * s3=Meine Platte
   *
   * # first ChoiceFormat choice
   * s4=keine Dateien
   *
   * # second ChoiceFormat choice
   * s5=eine Datei
   *
   * # third ChoiceFormat choice
   * s6={0,number} Dateien
   *
   * # sample date
   * s7=3. M&auml;rz 1996
   * </pre>
   * </blockquote>
   *
   * <p>
   * The implementation of a {@code PropertyResourceBundle} subclass must be
   * thread-safe if it's simultaneously used by multiple threads. The default
   * implementations of the non-abstract methods in this class are thread-safe.
   *
   * <p>
   * <strong>Note:</strong> PropertyResourceBundle can be constructed either
   * from an InputStream or a Reader, which represents a property file.
   * Constructing a PropertyResourceBundle instance from an InputStream requires
   * that the input stream be encoded in ISO-8859-1.  In that case, characters
   * that cannot be represented in ISO-8859-1 encoding must be represented by Unicode Escapes
   * as defined in section 3.3 of
   * <cite>The Java&trade; Language Specification</cite>
   * whereas the other constructor which takes a Reader does not have that limitation.
   *
   * @see ResourceBundle
   * @see ListResourceBundle
   * @see Properties
   * @since JDK1.1
   */
  public class PropertyResourceBundle extends ResourceBundle {
      /**
       * Creates a property resource bundle from an {@link InputStream
       * InputStream}.  The property file read with this constructor
       * must be encoded in ISO-8859-1.
       *
       * @param stream an InputStream that represents a property file
       *        to read from.
       * @throws IOException if an I/O error occurs
       * @throws NullPointerException if <code>stream</code> is null
       * @throws IllegalArgumentException if {@code stream} contains a
       *     malformed Unicode escape sequence.
       */
      @SuppressWarnings({"unchecked", "rawtypes"})
      public PropertyResourceBundle (InputStream stream) throws IOException {
          Properties properties = new Properties();
          properties.load(stream);
          lookup = new HashMap(properties);
      }
  
      /**
       * Creates a property resource bundle from a {@link Reader
       * Reader}.  Unlike the constructor
       * {@link #PropertyResourceBundle(InputStream) PropertyResourceBundle(InputStream)},
       * there is no limitation as to the encoding of the input property file.
       *
       * @param reader a Reader that represents a property file to
       *        read from.
       * @throws IOException if an I/O error occurs
       * @throws NullPointerException if <code>reader</code> is null
       * @throws IllegalArgumentException if a malformed Unicode escape sequence appears
       *     from {@code reader}.
       * @since 1.6
       */
      @SuppressWarnings({"unchecked", "rawtypes"})
      public PropertyResourceBundle (Reader reader) throws IOException {
          Properties properties = new Properties();
          properties.load(reader);
          lookup = new HashMap(properties);
      }
  
      // Implements java.util.ResourceBundle.handleGetObject; inherits javadoc specification.
      public Object handleGetObject(String key) {
          if (key == null) {
              throw new NullPointerException();
          }
          return lookup.get(key);
      }
  
      /**
       * Returns an <code>Enumeration</code> of the keys contained in
       * this <code>ResourceBundle</code> and its parent bundles.
       *
       * @return an <code>Enumeration</code> of the keys contained in
       *         this <code>ResourceBundle</code> and its parent bundles.
       * @see #keySet()
       */
      public Enumeration<String> getKeys() {
          ResourceBundle parent = this.parent;
          return new ResourceBundleEnumeration(lookup.keySet(),
                  (parent != null) ? parent.getKeys() : null);
      }
  
      /**
       * Returns a <code>Set</code> of the keys contained
       * <em>only</em> in this <code>ResourceBundle</code>.
       *
       * @return a <code>Set</code> of the keys contained only in this
       *         <code>ResourceBundle</code>
       * @since 1.6
       * @see #keySet()
       */
      protected Set<String> handleKeySet() {
          return lookup.keySet();
      }
  
      // ==================privates====================
  
      // Android-changed: Fix unsafe publication http://b/31467561
      // Fixed in OpenJDK 9: http://hg.openjdk.java.net/jdk9/dev/jdk/rev/29ecac30ecae
      // was: private Map<String,Object> lookup;
      private final Map<String,Object> lookup;
  }
  