llcommandhandler.cpp

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#include "llviewerprecompiledheaders.h"

#include "llcommandhandler.h"

// system includes
#include <boost/tokenizer.hpp>

//---------------------------------------------------------------------------
// Underlying registry for command handlers, not directly accessible.
//---------------------------------------------------------------------------
struct LLCommandHandlerInfo
{
        bool mAllowFromExternalBrowser;
        LLCommandHandler* mHandler;     // safe, all of these are static objects
};

class LLCommandHandlerRegistry
{
public:
        static LLCommandHandlerRegistry& instance();
        void add(const char* cmd, bool allow_from_external_browser, LLCommandHandler* handler);
        bool dispatch(const std::string& cmd, bool from_external_browser, const LLSD& params, const LLSD& queryMap);

private:
        std::map<std::string, LLCommandHandlerInfo> mMap;
};

// static 
LLCommandHandlerRegistry& LLCommandHandlerRegistry::instance()
{
        // Force this to be initialized on first call, because we're going
        // to be adding items to the std::map before main() and we can't
        // rely on a global being initialized in the right order.
        static LLCommandHandlerRegistry instance;
        return instance;
}

void LLCommandHandlerRegistry::add(const char* cmd, bool allow_from_external_browser, LLCommandHandler* handler)
{
        LLCommandHandlerInfo info;
        info.mAllowFromExternalBrowser = allow_from_external_browser;
        info.mHandler = handler;

        mMap[cmd] = info;
}

bool LLCommandHandlerRegistry::dispatch(const std::string& cmd,
                                                                                bool from_external_browser,
                                                                                const LLSD& params,
                                                                                const LLSD& queryMap)
{
        std::map<std::string, LLCommandHandlerInfo>::iterator it = mMap.find(cmd);
        if (it == mMap.end()) return false;
        const LLCommandHandlerInfo& info = it->second;
        if (from_external_browser && !info.mAllowFromExternalBrowser)
        {
                // block request from external browser, but report as
                // "handled" because it was well formatted.
                return true;
        }
        if (!info.mHandler) return false;
        return info.mHandler->handle(params, queryMap);
}

//---------------------------------------------------------------------------
// Automatic registration of commands, runs before main()
//---------------------------------------------------------------------------

LLCommandHandler::LLCommandHandler(const char* cmd, bool allow_from_external_browser)
{
        LLCommandHandlerRegistry::instance().add(cmd, allow_from_external_browser, this);
}

LLCommandHandler::~LLCommandHandler()
{
        // Don't care about unregistering these, all the handlers
        // should be static objects.
}

//---------------------------------------------------------------------------
// Public interface
//---------------------------------------------------------------------------

// static
bool LLCommandDispatcher::dispatch(const std::string& cmd,
                                                                   bool from_external_browser,
                                                                   const LLSD& params, const LLSD& queryMap)
{
        return LLCommandHandlerRegistry::instance().dispatch(
                cmd, from_external_browser, params, queryMap);
}

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