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 <span id="projectnumber">3.2.1</span>
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<a href="#pub-types">Public Types</a> |
<a href="#pub-methods">Public Member Functions</a> </div>
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<div class="title">Wt::WMessageResourceBundle Class Reference</div> </div>
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<!-- doxytag: class="Wt::WMessageResourceBundle" --><!-- doxytag: inherits="Wt::WLocalizedStrings" -->
<p>Support for localized strings using XML files.
<a href="classWt_1_1WMessageResourceBundle.html#details">More...</a></p>
<p><code>#include <Wt/WMessageResourceBundle></code></p>
<div class="dynheader">
Inheritance diagram for Wt::WMessageResourceBundle:</div>
<div class="dyncontent">
<div class="center"><img src="classWt_1_1WMessageResourceBundle__inherit__graph.png" border="0" usemap="#Wt_1_1WMessageResourceBundle_inherit__map" alt="Inheritance graph"/></div>
<map name="Wt_1_1WMessageResourceBundle_inherit__map" id="Wt_1_1WMessageResourceBundle_inherit__map">
<area shape="rect" href="classWt_1_1WLocalizedStrings.html" title="An abstract class that provides support for localized strings." alt="" coords="32,5,187,32"/></map>
<center><span class="legend">[<a href="graph_legend.html">legend</a>]</span></center></div>
<p><a href="classWt_1_1WMessageResourceBundle-members.html">List of all members.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="pub-types"></a>
Public Types</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WMessageResourceBundle.html#a384dd7fde994d5419c87b069b3c3226d">Scope</a> </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Resource key scope. <br/></td></tr>
<tr><td colspan="2"><h2><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aecfe527e2123bf7793d926f71dc2ed23"></a><!-- doxytag: member="Wt::WMessageResourceBundle::WMessageResourceBundle" ref="aecfe527e2123bf7793d926f71dc2ed23" args="()" -->
 </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WMessageResourceBundle.html#aecfe527e2123bf7793d926f71dc2ed23">WMessageResourceBundle</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Creates a message resource bundle. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WMessageResourceBundle.html#a01368946b2a2aaceab3a64cddb1cb1e2">use</a> (const std::string &path, bool loadInMemory=true)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Adds a (series) of message resource files to be used. <a href="#a01368946b2a2aaceab3a64cddb1cb1e2"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">const std::set< std::string > </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WMessageResourceBundle.html#aef1673743006fac449c095690aeff413">keys</a> (WFlags< <a class="el" href="classWt_1_1WMessageResourceBundle.html#a384dd7fde994d5419c87b069b3c3226d">Scope</a> > scope) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns a set of all keys in this bundle. <a href="#aef1673743006fac449c095690aeff413"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WMessageResourceBundle.html#a8dd275eff8f823ee58a1e673a79b71e7">refresh</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Rereads the message resources. <a href="#a8dd275eff8f823ee58a1e673a79b71e7"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WMessageResourceBundle.html#a5e6c391a95229691fcae8c058c637b7b">hibernate</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Purges memory resources, if possible. <a href="#a5e6c391a95229691fcae8c058c637b7b"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WMessageResourceBundle.html#a22878a466da85139384133f01c7fec77">resolveKey</a> (const std::string &key, std::string &result)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Resolves a key in the current locale. <a href="#a22878a466da85139384133f01c7fec77"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WMessageResourceBundle.html#ad29f61458c5bba4d19d7adcf7f0478ea">resolvePluralKey</a> (const std::string &key, std::string &result,::uint64_t amount)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Resolves the plural form of a key in the current locale. <a href="#ad29f61458c5bba4d19d7adcf7f0478ea"></a><br/></td></tr>
</table>
<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>Support for localized strings using XML files. </p>
<p>The resource bundle manages a number of resource files, which allow the developer to conceptually manage its messages in a number of libraries.</p>
<p>For example, a <a class="el" href="classWt_1_1WApplication.html" title="Represents an application instance for a single session.">WApplication</a> may have a generic message library, that is shared with many other libraries, with re-occurring messages (such as 'welcome', 'add to shopping cart', and 'pay'), and a specific message library for specific messages.</p>
<p>Usage example:</p>
<p>XML file "general.xml": </p>
<div class="fragment"><pre class="fragment">
<?xml version="1.0" encoding="UTF-8"?>
<messages>
<message id='welcome-text'>
Welcome dear visiter, {1} of the WFooBar magic website !
</message>
<message id='company-policy'>
The company policy is to <b>please our share-holders</b>.
</message>
</messages>
</pre></div><p>The encodings supported are ASCII, UTF-8 (recommended) or UTF-16.</p>
<p>Use this resource bundle in your program: </p>
<div class="fragment"><pre class="fragment"> <span class="comment">// load the message resource bundle</span>
<a class="code" href="classWt_1_1WApplication.html" title="Represents an application instance for a single session.">Wt::WApplication</a> *app = <a class="code" href="classWt_1_1WApplication.html#a38d922da0a0d83395519f3eaab85d0f6" title="Returns the current application instance.">Wt::WApplication::instance</a>();
app-><a class="code" href="classWt_1_1WApplication.html#a4f304244f6bc75be6cd5f41798ea5e2e" title="Returns the message resource bundle.">messageResourceBundle</a>().use(<span class="stringliteral">"general"</span>);
<span class="comment">// resolve a string using the resource bundle</span>
<a class="code" href="classWt_1_1WText.html" title="A widget that renders (XHTML) text.">Wt::WText</a> *welcome = <span class="keyword">new</span> <a class="code" href="classWt_1_1WText.html" title="A widget that renders (XHTML) text.">Wt::WText</a>(tr(<span class="stringliteral">"welcome-visitor"</span>).arg(<span class="stringliteral">"Bart"</span>));
</pre></div><p>To refer the two messages defined in this resource file, use <a class="el" href="classWt_1_1WString.html#a0afc7dc0f9897456d71b569a86ca26c1" title="Creates a localized string from a key.">WString::tr</a>("welcome-text").<a class="el" href="classWt_1_1WString.html#a1c3d0d7790282777ce13edececfe0095">arg</a>(userName) or <a class="el" href="classWt_1_1WWidget.html#aa651f107ec7cf080faef6c435705fc44" title="Short hand for WString::tr()">WWidget::tr</a>("company-policy").</p>
<h3>Plural forms</h3>
<p>The XML format supports plural noun forms, and allows the definition of different cases of plural nouns, per language. The amount of cases per noun may differ between language families, as does the expression to transform a number associated with a noun into a case id. Two attributes for the <code>messages</code> XML element configure the plural support:</p>
<ul>
<li>the 'nplurals' attribute indicates the number of plural cases; cases are numbered 0 .. (<em>nplurals</em> - 1).</li>
<li>the 'plural' attribute is an expression which evaluates converts a count <em>n</em> into a plural case. This expression should use the C language syntax, with the exception that no negative numbers are allowed, numbers must be integers, and the only allowed variable is n, which corresponds to the amount passed to <a class="el" href="classWt_1_1WString.html#abcff7d3d30972762bd5d9279dc903a36" title="Creates a localized string from a key for a number n.">WString::trn()</a>. The resulting value must be a plural case: 0 .. (<em>nplurals</em> - 1).</li>
</ul>
<p>Using <a class="el" href="classWt_1_1WString.html#abcff7d3d30972762bd5d9279dc903a36" title="Creates a localized string from a key for a number n.">WString::trn()</a>, you can pass the count <em>n</em> that is used to select a suitable plural case.</p>
<p>As an example, consider an XML resource file describing Polish translations, which enlists all plural cases of the noun 'plik' (<em>file</em> in Polish). The noun is used this way:</p>
<ul>
<li>1 plik</li>
<li>2,3,4 pliki</li>
<li>5-21 pliko'w</li>
<li>22-24 pliki</li>
<li>25-31 pliko'w</li>
</ul>
<div class="fragment"><pre class="fragment">
<?xml version="1.0" encoding="UTF-8"?>
<messages nplurals="3"
plural="n==1 ? 0 : n%10>=2 && n%10<=4 && (n%100<10 || n%100>=20) ? 1 : 2">
<message id="file">
<plural case="0">{1} plik</plural>
<plural case="1">{1} pliki</plural>
<plural case="2">{1} pliko'w</plural>
</message>
</messages>
</pre></div><p>To message defined in this resource file can then be used using <a class="el" href="classWt_1_1WString.html#abcff7d3d30972762bd5d9279dc903a36" title="Creates a localized string from a key for a number n.">WString::trn</a>("file", n).</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WApplication.html#a6e782f1f38a6f56e2024aab1a917a80b" title="Returns the current locale.">WApplication::locale()</a>, <a class="el" href="classWt_1_1WString.html#a0afc7dc0f9897456d71b569a86ca26c1" title="Creates a localized string from a key.">WString::tr()</a>, <a class="el" href="classWt_1_1WString.html#abcff7d3d30972762bd5d9279dc903a36" title="Creates a localized string from a key for a number n.">WString::trn()</a> </dd></dl>
</div><hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a5e6c391a95229691fcae8c058c637b7b"></a><!-- doxytag: member="Wt::WMessageResourceBundle::hibernate" ref="a5e6c391a95229691fcae8c058c637b7b" args="()" -->
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<td class="memname">void Wt::WMessageResourceBundle::hibernate </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td><code> [virtual]</code></td>
</tr>
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</div>
<div class="memdoc">
<p>Purges memory resources, if possible. </p>
<p>This is called afer event handling, and is an opportunity to conserve memory inbetween events, by freeing memory used for cached key/value bindings, if applicable.</p>
<p>The default implementation does nothing. </p>
<p>Reimplemented from <a class="el" href="classWt_1_1WLocalizedStrings.html#a2ea29ba180ed9af25cf561f0df6a995d">Wt::WLocalizedStrings</a>.</p>
</div>
</div>
<a class="anchor" id="aef1673743006fac449c095690aeff413"></a><!-- doxytag: member="Wt::WMessageResourceBundle::keys" ref="aef1673743006fac449c095690aeff413" args="(WFlags< Scope > scope) const " -->
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<td class="memname">const std::set< std::string > Wt::WMessageResourceBundle::keys </td>
<td>(</td>
<td class="paramtype">WFlags< <a class="el" href="classWt_1_1WMessageResourceBundle.html#a384dd7fde994d5419c87b069b3c3226d">Scope</a> > </td>
<td class="paramname"><em>scope</em></td><td>)</td>
<td> const</td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Returns a set of all keys in this bundle. </p>
<p>Returns a set of all keys connected with this WMessageResources, within the scope provided as parameter. </p>
</div>
</div>
<a class="anchor" id="a8dd275eff8f823ee58a1e673a79b71e7"></a><!-- doxytag: member="Wt::WMessageResourceBundle::refresh" ref="a8dd275eff8f823ee58a1e673a79b71e7" args="()" -->
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<td class="memname">void Wt::WMessageResourceBundle::refresh </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td><code> [virtual]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Rereads the message resources. </p>
<p>Purge any cached key/values, if applicable.</p>
<p>The default implementation does nothing. </p>
<p>Reimplemented from <a class="el" href="classWt_1_1WLocalizedStrings.html#a71b2ca0b40eed56ee1acba8f865e7220">Wt::WLocalizedStrings</a>.</p>
</div>
</div>
<a class="anchor" id="a22878a466da85139384133f01c7fec77"></a><!-- doxytag: member="Wt::WMessageResourceBundle::resolveKey" ref="a22878a466da85139384133f01c7fec77" args="(const std::string &key, std::string &result)" -->
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<td class="memname">bool Wt::WMessageResourceBundle::resolveKey </td>
<td>(</td>
<td class="paramtype">const std::string & </td>
<td class="paramname"><em>key</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">std::string & </td>
<td class="paramname"><em>result</em> </td>
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<td></td>
<td>)</td>
<td></td><td><code> [virtual]</code></td>
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<div class="memdoc">
<p>Resolves a key in the current locale. </p>
<p>This method is used by <a class="el" href="classWt_1_1WString.html" title="A value class which describes a locale-aware unicode string.">WString</a> to obtain the UTF8 value corresponding to a key in the current locale.</p>
<p>Returns <code>true</code> if the key could be resolved. The value is written in <code>result</code>, encoded using UTF8.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WApplication.html#a6e782f1f38a6f56e2024aab1a917a80b" title="Returns the current locale.">WApplication::locale()</a>, <a class="el" href="classWt_1_1WString.html#a0afc7dc0f9897456d71b569a86ca26c1" title="Creates a localized string from a key.">WString::tr()</a> </dd></dl>
<p>Implements <a class="el" href="classWt_1_1WLocalizedStrings.html#a05666a0ae917e4fd6deafdd2f4b98ba2">Wt::WLocalizedStrings</a>.</p>
</div>
</div>
<a class="anchor" id="ad29f61458c5bba4d19d7adcf7f0478ea"></a><!-- doxytag: member="Wt::WMessageResourceBundle::resolvePluralKey" ref="ad29f61458c5bba4d19d7adcf7f0478ea" args="(const std::string &key, std::string &result,::uint64_t amount)" -->
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<td class="memname">bool Wt::WMessageResourceBundle::resolvePluralKey </td>
<td>(</td>
<td class="paramtype">const std::string & </td>
<td class="paramname"><em>key</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">std::string & </td>
<td class="paramname"><em>result</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">::uint64_t </td>
<td class="paramname"><em>amount</em> </td>
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<td></td>
<td>)</td>
<td></td><td><code> [virtual]</code></td>
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<p>Resolves the plural form of a key in the current locale. </p>
<p>This method is used by <a class="el" href="classWt_1_1WString.html" title="A value class which describes a locale-aware unicode string.">WString</a> to obtain the UTF8 value corresponding to a key in the current locale, taking into account the possibility of multiple plural forms, and chosing the right plural form based on the <code>amount</code> passed.</p>
<p>Throws a std::logic_error if the underlying implementation does not provide support for plural internationalized strings.</p>
<p>Returns <code>true</code> if the key could be resolved. The value is written in <code>result</code>, encoded as UTF8.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WApplication.html#a6e782f1f38a6f56e2024aab1a917a80b" title="Returns the current locale.">WApplication::locale()</a>, <a class="el" href="classWt_1_1WString.html#abcff7d3d30972762bd5d9279dc903a36" title="Creates a localized string from a key for a number n.">WString::trn()</a> </dd></dl>
<p>Reimplemented from <a class="el" href="classWt_1_1WLocalizedStrings.html#a679c976ebd09d9ab0b1db8e93a6e18d5">Wt::WLocalizedStrings</a>.</p>
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<a class="anchor" id="a01368946b2a2aaceab3a64cddb1cb1e2"></a><!-- doxytag: member="Wt::WMessageResourceBundle::use" ref="a01368946b2a2aaceab3a64cddb1cb1e2" args="(const std::string &path, bool loadInMemory=true)" -->
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<td class="memname">void Wt::WMessageResourceBundle::use </td>
<td>(</td>
<td class="paramtype">const std::string & </td>
<td class="paramname"><em>path</em>, </td>
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<td class="paramtype">bool </td>
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<td>)</td>
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<p>Adds a (series) of message resource files to be used. </p>
<p>The <code>path</code> is not a URI, and relative paths will be resolved with respect to the working directory of the server. The XML files do not need to be deployed in the web server's docroot.</p>
<p>When you give as <code>path:</code> /path/to/name, then the following message resource files will be used:</p>
<ul>
<li>/path/to/name.xml (default, English)</li>
<li>/path/to/name_nl.xml (for Dutch)</li>
<li>/path/to/name_fr.xml (for French)</li>
<li>etc...</li>
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<p>The message file that is used depends on the application's locale.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WApplication.html#a6e782f1f38a6f56e2024aab1a917a80b" title="Returns the current locale.">WApplication::locale()</a> </dd></dl>
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