/*
* Copyright 2007 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.gwt.i18n.client;
/**
* A tag interface that serves as the root of a family of types used in static
* internationalization. Using <code>GWT.create(<i>class</i>)</code> to
* instantiate a type that directly extends or implements
* <code>Localizable</code> invites locale-sensitive type substitution.
*
* <h3>Locale-sensitive Type Substitution</h3>
* If a type <code>Type</code> directly extends or implements
* <code>Localizable</code> (as opposed to
* {@link com.google.gwt.i18n.client.Constants} or
* {@link com.google.gwt.i18n.client.Messages}) and the following code is used
* to create an object from <code>Type</code> as follows:
*
* <pre class="code">Type localized = (Type)GWT.create(Type.class);</pre>
*
* then <code>localized</code> will be assigned an instance of a localized
* subclass, selected based on the value of the <code>locale</code> client
* property. The choice of subclass is determined by the following naming
* pattern:
*
* <table>
*
* <tr>
* <th align='left'>If <code>locale</code> is...    </th>
* <th align='left'>The substitute class for <code>Type</code> is...</th>
* </tr>
*
* <tr>
* <td><i>unspecified</i></td>
* <td><code>Type</code> itself, or <code>Type_</code> if <code>Type</code>
* is an interface</td>
* </tr>
*
* <tr>
* <td><code>x</code></td>
* <td>Class <code>Type_x</code> if it exists, otherwise treated as if
* <code>locale</code> were <i>unspecified</i></td>
* </tr>
*
* <tr>
* <td><code>x_Y</code></td>
* <td>Class <code>Type_x_Y</code> if it exists, otherwise treated as if
* <code>locale</code> were <code>x</code></td>
* </tr>
*
* </table>
*
* where in the table above <code>x</code> is a <a
* href="http://ftp.ics.uci.edu/pub/ietf/http/related/iso639.txt">ISO language
* code</a> and <code>Y</code> is a two-letter <a
* href="http://userpage.chemie.fu-berlin.de/diverse/doc/ISO_3166.html">ISO
* country code</a>.
*
* <h3>Specifying Locale</h3>
* The locale of a module is specified using the <code>locale</code> client
* property, which can be specified using either a meta tag or as part of the
* query string in the host page's URL. If both are specified, the query string
* takes precedence.
*
* <p>
* To specify the <code>locale</code> client property using a meta tag in the
* host HTML, use <code>gwt:property</code> as follows:
*
* <pre><meta name="gwt:property" content="locale=x_Y"></pre>
*
* For example, the following host HTML page sets the locale to "ja_JP":
*
* {@gwt.include com/google/gwt/examples/i18n/ColorNameLookupExample_ja_JP.html}
* </p>
*
* <p>
* To specify the <code>locale</code> client property using a query string,
* specify a value for the name <code>locale</code>. For example,
*
* <pre>http://www.example.org/myapp.html?locale=fr_CA</pre>
*
* </p>
*
* <h3>For More Information</h3>
* See the GWT Developer Guide for an introduction to internationalization.
*
* @see com.google.gwt.i18n.client.Constants
* @see com.google.gwt.i18n.client.ConstantsWithLookup
* @see com.google.gwt.i18n.client.Messages
* @see com.google.gwt.i18n.client.Dictionary
*/
public interface Localizable {
}
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