Move ICU headers from public/{common,i18n} to source/{common,i18n}

public/common/unicode/icuplug.h

Index: public/common/unicode/icuplug.h
diff --git a/public/common/unicode/icuplug.h b/public/common/unicode/icuplug.h
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-/*
-******************************************************************************
-*
-*   Copyright (C) 2009-2010, International Business Machines
-*   Corporation and others.  All Rights Reserved.
-*
-******************************************************************************
-*
-*  FILE NAME : icuplug.h
-*
-*   Date         Name        Description
-*   10/29/2009   sl          New.
-******************************************************************************
-*/
-
-/**
- * \file
- * \brief C API: ICU Plugin API 
- *
- * <h2>C API: ICU Plugin API</h2>
- *
- * <p>C API allowing run-time loadable modules that extend or modify ICU functionality.</p>
- *
- * <h3>Loading and Configuration</h3>
- *
- * <p>At ICU startup time, the environment variable "ICU_PLUGINS" will be 
- * queried for a directory name.  If it is not set, the preprocessor symbol 
- * "DEFAULT_ICU_PLUGINS" will be checked for a default value.</p>
- *
- * <p>Within the above-named directory, the file  "icuplugins##.txt" will be 
- * opened, if present, where ## is the major+minor number of the currently 
- * running ICU (such as, 44 for ICU 4.4, thus icuplugins44.txt)</p>
- *
- * <p>The configuration file has this format:</p>
- *
- * <ul>
- * <li>Hash (#) begins a comment line</li>
- * 
- * <li>Non-comment lines have two or three components:
- * LIBRARYNAME     ENTRYPOINT     [ CONFIGURATION .. ]</li>
- *
- * <li>Tabs or spaces separate the three items.</li>
- *
- * <li>LIBRARYNAME is the name of a shared library, either a short name if 
- * it is on the loader path,  or a full pathname.</li>
- *
- * <li>ENTRYPOINT is the short (undecorated) symbol name of the plugin's 
- * entrypoint, as above.</li>
- *
- * <li>CONFIGURATION is the entire rest of the line . It's passed as-is to 
- * the plugin.</li>
- * </ul>
- *
- * <p>An example configuration file is, in its entirety:</p>
- *
- * \code
- * # this is icuplugins44.txt
- * testplug.dll    myPlugin        hello=world
- * \endcode
- * <p>Plugins are categorized as "high" or "low" level.  Low level are those 
- * which must be run BEFORE high level plugins, and before any operations 
- * which cause ICU to be 'initialized'.  If a plugin is low level but 
- * causes ICU to allocate memory or become initialized, that plugin is said 
- * to cause a 'level change'. </p>
- *
- * <p>At load time, ICU first queries all plugins to determine their level, 
- * then loads all 'low' plugins first, and then loads all 'high' plugins.  
- * Plugins are otherwise loaded in the order listed in the configuration file.</p>
- * 
- * <h3>Implementing a Plugin</h3>
- * \code
- * U_CAPI UPlugTokenReturn U_EXPORT2 
- * myPlugin (UPlugData *plug, UPlugReason reason, UErrorCode *status) {
- *   if(reason==UPLUG_REASON_QUERY) {
- *      uplug_setPlugName(plug, "Simple Plugin");
- *      uplug_setPlugLevel(plug, UPLUG_LEVEL_HIGH);
- *    } else if(reason==UPLUG_REASON_LOAD) {
- *       ... Set up some ICU things here.... 
- *    } else if(reason==UPLUG_REASON_UNLOAD) {
- *       ... unload, clean up ...
- *    }
- *   return UPLUG_TOKEN;
- *  }
- * \endcode
- *
- * <p>The UPlugData*  is an opaque pointer to the plugin-specific data, and is 
- * used in all other API calls.</p>
- *
- * <p>The API contract is:</p>
- * <ol><li>The plugin MUST always return UPLUG_TOKEN as a return value- to 
- * indicate that it is a valid plugin.</li>
- *
- * <li>When the 'reason' parameter is set to UPLUG_REASON_QUERY,  the 
- * plugin MUST call uplug_setPlugLevel() to indicate whether it is a high 
- * level or low level plugin.</li>
- *
- * <li>When the 'reason' parameter is UPLUG_REASON_QUERY, the plugin 
- * SHOULD call uplug_setPlugName to indicate a human readable plugin name.</li></ol>
- * 
- *
- * \internal ICU 4.4 Technology Preview
- */
-
-
-#ifndef ICUPLUG_H
-#define ICUPLUG_H
-
-#include "unicode/utypes.h"
-
-
-/* === Basic types === */
-
-/**
- * @{
- * Opaque structure passed to/from a plugin. 
- * use the APIs to access it.
- * @internal ICU 4.4 Technology Preview
- */
-
-struct UPlugData;
-typedef struct UPlugData UPlugData;
-
-/** @} */
-
-/**
- * Random Token to identify a valid ICU plugin. Plugins must return this 
- * from the entrypoint.
- * @internal ICU 4.4 Technology Preview
- */
-#define UPLUG_TOKEN 0x54762486
-
-/**
- * Max width of names, symbols, and configuration strings
- * @internal ICU 4.4 Technology Preview
- */
-#define UPLUG_NAME_MAX              100
-
-
-/**
- * Return value from a plugin entrypoint. 
- * Must always be set to UPLUG_TOKEN
- * @see UPLUG_TOKEN
- * @internal ICU 4.4 Technology Preview
- */
-typedef uint32_t UPlugTokenReturn;
-
-/**
- * Reason code for the entrypoint's call
- * @internal ICU 4.4 Technology Preview
- */
-typedef enum {
-    UPLUG_REASON_QUERY = 0,     /**< The plugin is being queried for info. **/
-    UPLUG_REASON_LOAD = 1,     /**< The plugin is being loaded. **/
-    UPLUG_REASON_UNLOAD = 2,   /**< The plugin is being unloaded. **/
-    UPLUG_REASON_COUNT         /**< count of known reasons **/
-} UPlugReason;
-
-
-/**
- * Level of plugin loading
- *     INITIAL:  UNKNOWN
- *       QUERY:   INVALID ->  { LOW | HIGH }
- *     ERR -> INVALID
- * @internal ICU 4.4 Technology Preview
- */
-typedef enum {
-    UPLUG_LEVEL_INVALID = 0,     /**< The plugin is invalid, hasn't called uplug_setLevel, or can't load. **/
-    UPLUG_LEVEL_UNKNOWN = 1,     /**< The plugin is waiting to be installed. **/
-    UPLUG_LEVEL_LOW     = 2,     /**< The plugin must be called before u_init completes **/
-    UPLUG_LEVEL_HIGH    = 3,     /**< The plugin can run at any time. **/
-    UPLUG_LEVEL_COUNT         /**< count of known reasons **/
-} UPlugLevel;
-
-/**
- * Entrypoint for an ICU plugin.
- * @param plug the UPlugData handle. 
- * @param status the plugin's extended status code.
- * @return A valid plugin must return UPLUG_TOKEN
- * @internal ICU 4.4 Technology Preview
- */
-typedef UPlugTokenReturn (U_EXPORT2 UPlugEntrypoint) (
-                  UPlugData *plug,
-                  UPlugReason reason,
-                  UErrorCode *status);
-
-/* === Needed for Implementing === */
-
-/**
- * Request that this plugin not be unloaded at cleanup time.
- * This is appropriate for plugins which cannot be cleaned up.
- * @see u_cleanup()
- * @param plug plugin
- * @param dontUnload  set true if this plugin can't be unloaded
- * @internal ICU 4.4 Technology Preview
- */
-U_CAPI void U_EXPORT2 
-uplug_setPlugNoUnload(UPlugData *plug, UBool dontUnload);
-
-/**
- * Set the level of this plugin.
- * @param plug plugin data handle
- * @param level the level of this plugin
- * @internal ICU 4.4 Technology Preview
- */
-U_CAPI void U_EXPORT2
-uplug_setPlugLevel(UPlugData *plug, UPlugLevel level);
-
-/**
- * Get the level of this plugin.
- * @param plug plugin data handle
- * @return the level of this plugin
- * @internal ICU 4.4 Technology Preview
- */
-U_CAPI UPlugLevel U_EXPORT2
-uplug_getPlugLevel(UPlugData *plug);
-
-/**
- * Get the lowest level of plug which can currently load.
- * For example, if UPLUG_LEVEL_LOW is returned, then low level plugins may load
- * if UPLUG_LEVEL_HIGH is returned, then only high level plugins may load.
- * @return the lowest level of plug which can currently load
- * @internal ICU 4.4 Technology Preview
- */
-U_CAPI UPlugLevel U_EXPORT2
-uplug_getCurrentLevel(void);
-
-
-/**
- * Get plug load status
- * @return The error code of this plugin's load attempt.
- * @internal ICU 4.4 Technology Preview
- */
-U_CAPI UErrorCode U_EXPORT2
-uplug_getPlugLoadStatus(UPlugData *plug); 
-
-/**
- * Set the human-readable name of this plugin.
- * @param plug plugin data handle
- * @param name the name of this plugin. The first UPLUG_NAME_MAX characters willi be copied into a new buffer.
- * @internal ICU 4.4 Technology Preview
- */
-U_CAPI void U_EXPORT2
-uplug_setPlugName(UPlugData *plug, const char *name);
-
-/**
- * Get the human-readable name of this plugin.
- * @param plug plugin data handle
- * @return the name of this plugin
- * @internal ICU 4.4 Technology Preview
- */
-U_CAPI const char * U_EXPORT2
-uplug_getPlugName(UPlugData *plug);
-
-/**
- * Return the symbol name for this plugin, if known.
- * @param plug plugin data handle
- * @return the symbol name, or NULL
- * @internal ICU 4.4 Technology Preview
- */
-U_CAPI const char * U_EXPORT2
-uplug_getSymbolName(UPlugData *plug);
-
-/**
- * Return the library name for this plugin, if known.
- * @param plug plugin data handle
- * @param status error code
- * @return the library name, or NULL
- * @internal ICU 4.4 Technology Preview
- */
-U_CAPI const char * U_EXPORT2
-uplug_getLibraryName(UPlugData *plug, UErrorCode *status);
-
-/**
- * Return the library used for this plugin, if known.
- * Plugins could use this to load data out of their 
- * @param plug plugin data handle
- * @return the library, or NULL
- * @internal ICU 4.4 Technology Preview
- */
-U_CAPI void * U_EXPORT2
-uplug_getLibrary(UPlugData *plug);
-
-/**
- * Return the plugin-specific context data.
- * @param plug plugin data handle
- * @return the context, or NULL if not set
- * @internal ICU 4.4 Technology Preview
- */
-U_CAPI void * U_EXPORT2
-uplug_getContext(UPlugData *plug);
-
-/**
- * Set the plugin-specific context data.
- * @param plug plugin data handle
- * @param context new context to set
- * @internal ICU 4.4 Technology Preview
- */
-U_CAPI void U_EXPORT2
-uplug_setContext(UPlugData *plug, void *context);
-
-
-/**
- * Get the configuration string, if available.
- * The string is in the platform default codepage.
- * @param plug plugin data handle
- * @return configuration string, or else null.
- * @internal ICU 4.4 Technology Preview
- */
-U_CAPI const char * U_EXPORT2
-uplug_getConfiguration(UPlugData *plug);
-
-/**
- * Return all currently installed plugins, from newest to oldest
- * Usage Example:
- * \code
- *    UPlugData *plug = NULL;
- *    while(plug=uplug_nextPlug(plug)) {
- *        ... do something with 'plug' ...
- *    }
- * \endcode
- * Not thread safe- do not call while plugs are added or removed.
- * @param prior pass in 'NULL' to get the first (most recent) plug, 
- *  otherwise pass the value returned on a prior call to uplug_nextPlug
- * @return the next oldest plugin, or NULL if no more.
- * @internal ICU 4.4 Technology Preview
- */
-U_CAPI UPlugData* U_EXPORT2
-uplug_nextPlug(UPlugData *prior);
-
-/**
- * Inject a plugin as if it were loaded from a library.
- * This is useful for testing plugins. 
- * Note that it will have a 'NULL' library pointer associated
- * with it, and therefore no llibrary will be closed at cleanup time.
- * Low level plugins may not be able to load, as ordering can't be enforced.
- * @param entrypoint entrypoint to install
- * @param config user specified configuration string, if available, or NULL.
- * @param status error result
- * @return the new UPlugData associated with this plugin, or NULL if error.
- * @internal ICU 4.4 Technology Preview
- */
-U_CAPI UPlugData* U_EXPORT2
-uplug_loadPlugFromEntrypoint(UPlugEntrypoint *entrypoint, const char *config, UErrorCode *status);
-
-
-/**
- * Inject a plugin from a library, as if the information came from a config file.
- * Low level plugins may not be able to load, and ordering can't be enforced.
- * @param libName DLL name to load
- * @param sym symbol of plugin (UPlugEntrypoint function)
- * @param config configuration string, or NULL
- * @param status error result
- * @return the new UPlugData associated with this plugin, or NULL if error.
- * @internal ICU 4.4 Technology Preview
- */
-U_CAPI UPlugData* U_EXPORT2
-uplug_loadPlugFromLibrary(const char *libName, const char *sym, const char *config, UErrorCode *status);
-
-/**
- * Remove a plugin. 
- * Will request the plugin to be unloaded, and close the library if needed
- * @param plug plugin handle to close
- * @param status error result
- * @internal ICU 4.4 Technology Preview
- */
-U_CAPI void U_EXPORT2
-uplug_removePlug(UPlugData *plug, UErrorCode *status);
-
-
-#endif