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42 import java.io.InputStream;
43 import java.io.Reader;
44 import java.io.IOException;
45 import sun.util.ResourceBundleEnumeration;
48 * <code>PropertyResourceBundle</code> is a concrete subclass of
49 * <code>ResourceBundle</code> that manages resources for a locale
50 * using a set of static strings from a property file. See
51 * {@link ResourceBundle ResourceBundle} for more information about resource
55 * Unlike other types of resource bundle, you don't subclass
56 * <code>PropertyResourceBundle</code>. Instead, you supply properties
57 * files containing the resource data. <code>ResourceBundle.getBundle</code>
58 * will automatically look for the appropriate properties file and create a
59 * <code>PropertyResourceBundle</code> that refers to it. See
60 * {@link ResourceBundle#getBundle(java.lang.String, java.util.Locale, java.lang.ClassLoader) ResourceBundle.getBundle}
61 * for a complete description of the search and instantiation strategy.
64 * The following <a name="sample">example</a> shows a member of a resource
65 * bundle family with the base name "MyResources".
66 * The text defines the bundle "MyResources_de",
67 * the German member of the bundle family.
68 * This member is based on <code>PropertyResourceBundle</code>, and the text
69 * therefore is the content of the file "MyResources_de.properties"
70 * (a related <a href="ListResourceBundle.html#sample">example</a> shows
71 * how you can add bundles to this family that are implemented as subclasses
72 * of <code>ListResourceBundle</code>).
73 * The keys in this example are of the form "s1" etc. The actual
74 * keys are entirely up to your choice, so long as they are the same as
75 * the keys you use in your program to retrieve the objects from the bundle.
76 * Keys are case-sensitive.
79 * # MessageFormat pattern
80 * s1=Die Platte \"{1}\" enthält {0}.
82 * # location of {0} in pattern
88 * # first ChoiceFormat choice
91 * # second ChoiceFormat choice
94 * # third ChoiceFormat choice
95 * s6={0,number} Dateien
98 * s7=3. März 1996
103 * <strong>Note:</strong> PropertyResourceBundle can be constructed either
104 * from an InputStream or a Reader, which represents a property file.
105 * Constructing a PropertyResourceBundle instance from an InputStream requires
106 * that the input stream be encoded in ISO-8859-1. In that case, characters
107 * that cannot be represented in ISO-8859-1 encoding must be represented by Unicode Escapes
108 * as defined in section 3.3 of
109 * <cite>The Java™ Language Specification</cite>
110 * whereas the other constructor which takes a Reader does not have that limitation.
112 * @see ResourceBundle
113 * @see ListResourceBundle
117 public class PropertyResourceBundle extends ResourceBundle {
119 * Creates a property resource bundle from an {@link java.io.InputStream
120 * InputStream}. The property file read with this constructor
121 * must be encoded in ISO-8859-1.
123 * @param stream an InputStream that represents a property file
125 * @throws IOException if an I/O error occurs
126 * @throws NullPointerException if <code>stream</code> is null
128 public PropertyResourceBundle (InputStream stream) throws IOException {
129 Properties properties = new Properties();
130 properties.load(stream);
131 lookup = new HashMap(properties);
135 * Creates a property resource bundle from a {@link java.io.Reader
136 * Reader}. Unlike the constructor
137 * {@link #PropertyResourceBundle(java.io.InputStream) PropertyResourceBundle(InputStream)},
138 * there is no limitation as to the encoding of the input property file.
140 * @param reader a Reader that represents a property file to
142 * @throws IOException if an I/O error occurs
143 * @throws NullPointerException if <code>reader</code> is null
146 public PropertyResourceBundle (Reader reader) throws IOException {
147 Properties properties = new Properties();
148 properties.load(reader);
149 lookup = new HashMap(properties);
152 // Implements java.util.ResourceBundle.handleGetObject; inherits javadoc specification.
153 public Object handleGetObject(String key) {
155 throw new NullPointerException();
157 return lookup.get(key);
161 * Returns an <code>Enumeration</code> of the keys contained in
162 * this <code>ResourceBundle</code> and its parent bundles.
164 * @return an <code>Enumeration</code> of the keys contained in
165 * this <code>ResourceBundle</code> and its parent bundles.
168 public Enumeration<String> getKeys() {
169 ResourceBundle parent = this.parent;
170 return new ResourceBundleEnumeration(lookup.keySet(),
171 (parent != null) ? parent.getKeys() : null);
175 * Returns a <code>Set</code> of the keys contained
176 * <em>only</em> in this <code>ResourceBundle</code>.
178 * @return a <code>Set</code> of the keys contained only in this
179 * <code>ResourceBundle</code>
183 protected Set<String> handleKeySet() {
184 return lookup.keySet();
187 // ==================privates====================
189 private Map<String,Object> lookup;