276 lines
13 KiB
HTML
276 lines
13 KiB
HTML
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<!DOCTYPE html PUBLIC "-//w3c//dtd html 4.0 transitional//en">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<meta http-equiv="Content-Style-Type" content="text/css2">
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<title>ReadMe for ICU4J Locale Service Provider</title>
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<meta name="COPYRIGHT" content="Copyright 2008, International Business Machines Corporation and others. All Rights Reserved.">
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<style type="text/css">
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h3.doc { background: #CCCCFF }
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</style>
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</head>
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<body style="background-color: rgb(255, 255, 255);" lang="EN-US"
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link="#0000ff" vlink="#800080">
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<h2>ICU4J Locale Service Provider</h2>
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<h3>Read Me for ICU4J Locale Service Provider</h3>
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<hr size="2" width="100%">
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<p><b>Note:</b> This is a technical preview for ICU4J Locale Service Provider.
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This component may be changed or removed in future release of ICU4J.
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</p>
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<h3 class="doc">Contents</h3>
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<ul type="disc">
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<li><a href="#intro">Introduction</a></li>
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<li><a href="#usage">Using ICU4J Locale Service Provider</a></li>
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<li><a href="#config">Optional Configuration</a></li>
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<li><a href="#build">Building and Testing ICU4J Locale Service Provider</a></li>
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</ul>
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<h3 class="doc"><a name="intro"></a>Introduction</h3>
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<p>Java SE 6 introduced a new feature which allows Java user code to extend locale support
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in Java runtime environment. JREs shipped by Sun or IBM come with decent locale coverage,
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but some users may want more locale support. Java SE 6 includes abstract classes extending
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<a href="http://java.sun.com/javase/6/docs/api/java/util/spi/LocaleServiceProvider.html">
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java.util.spi.LocaleServiceProvider</a>. Java SE 6 users can create a subclass of these
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abstract class to supply their own locale support for text break, collation, date/number
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formatting or providing translations for currency, locale and time zone names.</p>
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<p>ICU4J has been providing more comprehensive locale coverage than standard JREs. However,
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Java programmers have to use ICU4J's own internationalization service APIs (com.ibm.icu.*)
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to utilize the rich locale support. Sometimes, the migration is not an option for various
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reasons. For example, your code may depend on existing Java libraries utilizing JDK
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internationalization service APIs, but you have no access to the source code. In this case,
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it is not possible to modify the libraries to use ICU4J APIs.</p>
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<p>ICU4J Locale Service Provider is a component consists of classes implementing the Java
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SE 6 locale sensitive service provider interfaces. Available service providers are -
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<ul>
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<li><a href="http://java.sun.com/javase/6/docs/api/java/text/spi/BreakIteratorProvider.html">BreakIteratorProvider</a></li>
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<li><a href="http://java.sun.com/javase/6/docs/api/java/text/spi/CollatorProvider.html">CollatorProvider</a></li>
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<li><a href="http://java.sun.com/javase/6/docs/api/java/text/spi/DateFormatProvider.html">DateFormatProvider</a></li>
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<li><a href="http://java.sun.com/javase/6/docs/api/java/text/spi/DateFormatSymbolsProvider.html">DateFormatSymbolsProvider</a></li>
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<li><a href="http://java.sun.com/javase/6/docs/api/java/text/spi/DecimalFormatSymbolsProvider.html">DecimalFormatSymbolsProvider</a></li>
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<li><a href="http://java.sun.com/javase/6/docs/api/java/text/spi/NumberFormatProvider.html">NumberFormatProvider</a></li>
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<li><a href="http://java.sun.com/javase/6/docs/api/java/util/spi/CurrencyNameProvider.html">CurrencyNameProvider</a></li>
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<li><a href="http://java.sun.com/javase/6/docs/api/java/util/spi/LocaleNameProvider.html">LocaleNameProvider</a></li>
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<li><a href="http://java.sun.com/javase/6/docs/api/java/util/spi/TimeZoneNameProvider.html">TimeZoneNameProvider</a></li>
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</ul>
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ICU4J Locale Service Provider is designed to work as installed extensions in a JRE.
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Once the component is configured properly, Java application running on the JRE automatically
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picks the ICU4J's internationalization service implementation when a requested locale is not
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available in the JRE.</p>
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<h3 class="doc"><a name="usage"></a>Using ICU4J Locale Service Provider</h3>
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<p>Java SE 6 locale sensitive service providers are using the
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<a href="http://java.sun.com/javase/6/docs/technotes/guides/extensions/index.html">Java Extension Mechanism</a>.
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An implementation of a locale sensitive service provider is installed as an optional package
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to extend the functionality of the Java core platform. To install an optional package, its JAR
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files must be placed in the Java extension directory. The standard location is
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<<i>java-home</i>>/lib/ext. You can alternatively use the system property <i>java.ext.dirs</i>
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to specify one or more locations where optional packages are installed. For example,
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if the JRE root directry is JAVA_HOME and you put ICU4J Locale Service Provider files
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in ICU_SPI_DIR, the ICU4J Locale Service Provider is enabled by the following command.
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<pre>
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java -Djava.ext.dirs=%JAVA_HOME%\lib\ext;%ICU_SPI_DIR% <your_java_app> [Microsoft Windows]
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java -Djava.ext.dirs=$JAVA_HOME/lib/ext:$ICU_SPI_DIR <your_java_app> [Linux, Solaris and other unix like platforms]
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</pre>
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</p>
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<p>The ICU4J's implementations of Java SE 6 locale sensitive service provider interfaces
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and configuration files are packaged in a single JAR file (icu4j-localespi-<<i>version</i>>.jar).
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But the actual implementation of the service classes and data are in the ICU4J core JAR
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file (icu4j-<<i>version</i>>.jar). So you need to put the localespi JAR file along
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with the core JAR file in the Java extension directory.</p>
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<p>Once the ICU4J Locale Service Provider is installed properly, factory methods in
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JDK internationalization classes look for the implementation provided by ICU4J when
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a requested locale is not supported by the JDK service class. For example, locale
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af_ZA (Afrikaans - South Africa) is not supported by JDK DateFormat in Sun Java SE 6.
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The following code snippet returns an instance of DateFormat from ICU4J Locale Service
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Provider and prints out the current date localized for af_ZA.
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<pre>
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DateFormat df = DateFormat.getDateInstance(DateFormat.LONG, new Locale("af", "ZA"));
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System.out.println(df.format(new Date()));
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</pre>
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Sample output:
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<pre>
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2008 Junie 19 [With ICU4J Locale Service Provider enabled]
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June 19, 2008 [Without ICU4J Locale Service Provider]
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</pre>
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</p>
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<h3 class="doc"><a name="config"></a>Optional Configuration</h3>
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<h4>Enabling or disabling individual service</h4>
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<p>By default, all Java 6 SE locale sensitive service providers are enabled in the
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ICU4J Locale Service Provider JAR file. If you want to disable specific providers
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supported by ICU4J, you can remove the corresponding provider configuration files
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from META-INF/services in the localespi JAR file. For example, if you do not want
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to use ICU's time zone name service at all, you can remove the file:
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META-INF/services/java.util.spi.TimeZoneNameProvider from the JAR file.</p>
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<p><b>Note:</b> Disabling DateFormatSymbolsProvider/DecimalFormatSymbolsProvider
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won't affect the localized symbols actually used by DateFormatProvider/NumberFormatProvider
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by the current implementation. These services are implemented independently.</p>
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<h4>Configuring the behavior of ICU4J Locale Service Provider</h4>
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<p>com/ibm/icu/impl/javaspi/ICULocaleServiceProviderConfig.properties in the localespi
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JAR file is used for configuring the behavior of the ICU4J Locale Service Provider
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implementation. There are some configuration properties available. See the table below
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for each configuration in detail.</p>
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<table border="1">
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<tr>
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<th>Property</th>
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<th>Value</th>
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<th>Default</th>
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<th>Description</th>
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</tr>
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<tr>
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<td>com.ibm.icu.impl.javaspi.ICULocaleServiceProvider.enableIcuVariants</td>
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<td>"true" or "false"</td>
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<td>"true"</td>
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<td>
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Whether if Locales with ICU's variant suffix will be included in getAvailableLocales.
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The current Java SE 6 locale sensitive service does not allow user provided provider
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implementations to override locales supported by JRE itself. When this property is
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"true"(default), ICU4J Locale Service Provider includes Locales with
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the suffix(com.ibm.icu.impl.javaspi.ICULocaleServiceProvider.icuVariantSuffix)
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in the variant field. For example, the ICU4J provider includes locales fr_FR and
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fr_FR_ICU in the available locale list. So JDK API user can still access the
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internationalization service object created by the ICU4J provider by the special locale
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fr_FR_ICU.
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</td>
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</tr>
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<tr>
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<td>com.ibm.icu.impl.javaspi.ICULocaleServiceProvider.icuVariantSuffix</td>
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<td><i>Any String</i></td>
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<td>"ICU"</td>
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<td>
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Suffix string used in Locale's variant field to specify the ICU implementation.
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</td>
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</tr>
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<tr>
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<td>com.ibm.icu.impl.javaspi.ICULocaleServiceProvider.enableIso3Languages</td>
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<td>"true" or "false"</td>
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<td>"true"</td>
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<td>
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Whether if 3-letter language Locales are included in getAvailabeLocales. Use of
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3-letter language codes in java.util.Locale is not supported by the API reference
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document. However, the implementation does not check the length of language code,
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so there is no practical problem with it.
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</td>
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</tr>
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<tr>
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<td>com.ibm.icu.impl.javaspi.ICULocaleServiceProvider.useDecimalFormat</td>
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<td>"true" or "false"</td>
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<td>"false"</td>
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<td>
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Whether if java.text.DecimalFormat subclass is used for NumberFormat#getXXXInstance.
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DecimalFormat#format(Object,StringBuffer,FieldPosition) is declared as final, so
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ICU cannot override the implementation. As a result, some number types such as
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BigInteger/BigDecimal are not handled by the ICU implementation. If a client expects
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NumberFormat#getXXXInstance returns a DecimalFormat (for example, need to manipulate
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decimal format patterns), he/she can set true to this setting. However, in this case,
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BigInteger/BigDecimal support is not done by ICU's implementation.
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</td>
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</tr>
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</table>
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<h3 class="doc"><a name="build"></a>Building and Testing ICU4J Locale Service Provider</h3>
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<p>ICU4J Locale Service Provider classes depend on the ICU4J core files. To build the
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component, you should build the ICU4J core JAR file first. Please refer <a href="../readme.html">
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ReadMe for ICU4J</a> to set up the build environment. The actual steps building the
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ICU4J Locale Service Provider JAR file are described below. The examples used in these steps
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assume the ICU4J source package is extracted to C:\icu4j on Microsoft Windows.</p>
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<p>1. Build the ICU4J core JAR file (icu4j.jar). The preferred JDK version for building
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the ICU4J core classes/JAR files is JDK 5.0.
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<pre>
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C:\icu4j>ant jar
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</pre>
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</p>
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<p>2. Set JAVA_HOME to JDK 6.0. The ICU4J Locale Service Provider requires JDK 6.0.
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If you used JDK 6.0 for building the ICU4J core JAR file, this step is not necessary.
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<pre>
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C:\icu4j>set JAVA_HOME=C:\jdk1.6.0
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</pre>
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</p>
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<p>3. Change directory to a subdirectory named "localespi"</p>
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<p>4. Run <b>ant</b> with the default target ("jar").
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<pre>
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C:\icu4j\localespi>ant
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Buildfile: build.xml
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check-env-java6:
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icu4j-jar:
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compile:
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[mkdir] Created dir: C:\icu4j\localespi\classes
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[javac] Compiling 22 source files to C:\icu4j\localespi\classes
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jar:
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[jar] Building jar: C:\icu4j\localespi\icu4j-localespi.jar
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build-jar:
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BUILD SUCCESSFUL
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Total time: 5 seconds
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</pre>
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</p>
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<p>With above steps, icu4j-localespi.jar is created in localespi subdirectory. To
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verify the ICU4J Locale Service Provider component, you can run <b>ant</b> with the
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target "check". (Note: The target "check" actually creates icu4j-localespi.jar, so
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you can simply run this target to build and test the component.)
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<pre>
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C:\icu4j\localespi\ant check
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</pre>
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After compiling classes used for testing, the test cases for ICU4J Locale Service
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Provider are executed. The test output looks like below.
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<pre>
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[java] TestAll {
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[java] BreakIteratorTest {
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[java] TestGetInstance Passed
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[java] TestICUEquivalent Passed
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[java] } Passed
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[java] CollatorTest {
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[java] TestGetInstance Passed
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[java] TestICUEquivalent Passed
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[java] } Passed
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[java] CurrencyNameTest {
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[java] TestCurrencySymbols Passe
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[java] } Passed
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[java] DateFormatSymbolsTest {
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[java] TestGetInstance Passed
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[java] TestICUEquivalent Passed
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[java] TestNynorsk Passed
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[java] TestSetSymbols Passed
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[java] } Passed
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[java] DateFormatTest {
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[java] TestGetInstance Passed
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[java] TestICUEquivalent Passed
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[java] TestThaiDigit Passed
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[java] } Passed
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[java] DecimalFormatSymbolsTest {
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[java] TestGetInstance Passed
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[java] TestICUEquivalent Passed
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[java] TestSetSymbols Passed
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[java] } Passed
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[java] LocaleNameTest {
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[java] TestCountryNames Passed
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[java] TestLanguageNames Passed
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[java] TestVariantNames Passed
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[java] } Passed
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[java] NumberFormatTest {
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[java] TestGetInstance Passed
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[java] TestICUEquivalent Passed
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[java] } Passed
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[java] TimeZoneNameTest {
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[java] TestTimeZoneNames Passed
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[java] } Passed
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[java] } Passed
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</pre>
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</p>
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</body>
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</html>
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