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/usr/include/Wt/WLocalizedStrings is in libwt-dev 3.3.6+dfsg-1.1.

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// This may look like C code, but it's really -*- C++ -*-
/*
 * Copyright (C) 2008 Emweb bvba, Kessel-Lo, Belgium.
 *
 * See the LICENSE file for terms of use.
 */
#ifndef WLOCALIZED_STRINGS_
#define WLOCALIZED_STRINGS_

#include <string>
#include <Wt/WDllDefs.h>

namespace Wt {

class WString;

/*! \class WLocalizedStrings Wt/WLocalizedStrings Wt/WLocalizedStrings
 *  \brief An abstract class that provides support for localized strings.
 *
 * This abstract class provides the content to localized WStrings, by
 * resolving the key to a string using the current application locale.
 *
 * \sa WString::tr(), WApplication::setLocalizedStrings()
 */
class WT_API WLocalizedStrings
{
public:
  /*! \brief Destructor.
   */
  virtual ~WLocalizedStrings();

  /*! \brief Rereads the message resources.
   *
   * Purge any cached key/values, if applicable.
   *
   * The default implementation does nothing.
   */
  virtual void refresh();

  /*! \brief Purges memory resources, if possible.
   * 
   * 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.
   *
   * The default implementation does nothing.
   */
  virtual void hibernate();

  /*! \brief Resolves a key in the current locale.
   * 
   * This method is used by WString to obtain the UTF8 value corresponding
   * to a key in the current locale.
   *
   * \if cpp
   * Returns \c true if the key could be resolved. The value is written
   * in \p result, encoded using UTF8.
   * \endif
   *
   * \if java
   * Returns the value if the key could be resolved. Returns \c null otherwise.
   * \endif
   *
   * \sa WApplication::locale(), WString::tr()
   */
#ifndef WT_TARGET_JAVA
  virtual bool resolveKey(const std::string& key, std::string& result) = 0;
#else // WT_TARGET_JAVA
  virtual std::string *resolveKey(const std::string& key) = 0;
#endif // WT_TARGET_JAVA

  /*! \brief Resolves the plural form of a key in the current locale.
   * 
   * This method is used by WString 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 \p amount passed.
   *
   * Throws a std::logic_error if the underlying implementation does not
   * provide support for plural internationalized strings.
   *
   * \if cpp
   * Returns \c true if the key could be resolved. The value is written
   * in \p result, encoded as UTF8.
   * \endif
   *
   * \if java
   * Returns the value if the key could be resolved. Returns \c null
   * otherwise.
   * \endif
   *
   * \sa WApplication::locale(), WString::trn()
   */
#ifndef WT_TARGET_JAVA
  virtual bool resolvePluralKey(const std::string& key, 
				std::string& result,
				::uint64_t amount);

  /*! \brief Utility method to evaluate a plural expression.
   *
   * This evaluates C expressions such as used by ngettext for a particular
   * value, which can be useful to implement plural key resolution.
   *
   * \sa resolvePluralKey() 
   */
  static int evaluatePluralExpression(const std::string &expression,
				      ::uint64_t n);

#else // WT_TARGET_JAVA
  //TODO make this work for java
  //virtual std::string *resolveKey(const std::string& key) = 0;
#endif // WT_TARGET_JAVA


};

}

#endif // WSTRING_TRANSLATOR_