CommandHandler.hpp

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/******************************************************************************/
/* REXX Kernel                                                                */
/*                                                                            */
/* Manage a command handler callback                                          */
/*                                                                            */
/******************************************************************************/
#ifndef Included_CommandHandler_hpp
#define Included_CommandHandler_hpp
 
#include "RexxCore.h"
#include "CallbackDispatcher.hpp"
 
class RexxActivity;
 
class CommandHandler : public RexxInternalObject
{
public:
    inline void *operator new(size_t size, void *ptr) { return ptr; }
    void        *operator new(size_t size);
    inline void  operator delete(void *) { ; }
    inline void  operator delete(void *, void *) { ; }
 
    inline CommandHandler(RESTORETYPE restoreType) { ; };
    inline CommandHandler(REXXPFN e) : entryPoint(e) { type = DIRECT; }
    inline CommandHandler(const char *n) : entryPoint(NULL) { type = UNRESOLVED; resolve(n); }
 
    void call(RexxActivity *activity, RexxActivation *activation, RexxString *address, RexxString *command, ProtectedObject &rc, ProtectedObject &condition);
    void resolve(const char *name);
    inline bool isResolved() { return type != UNRESOLVED; }
 
protected:
 
    typedef enum
    {
        UNRESOLVED,
        REGISTERED_NAME,
        DIRECT
    } HandlerType;
 
    REXXPFN    entryPoint;             // resolved exit entry point
    HandlerType   type;                // the type of call
};
 
 
class CommandHandlerDispatcher : public CallbackDispatcher
{
public:
    CommandHandlerDispatcher(RexxActivity * a, REXXPFN e, RexxString *c);
    virtual ~CommandHandlerDispatcher() { ; }
 
    virtual void run();
    void complete(RexxString *command, ProtectedObject &result, ProtectedObject &condition);
 
    RexxActivity *activity;               // the activity we're dispatching on
    REXXPFN    entryPoint;                // resolved exit entry point
    CONSTRXSTRING  rxstrcmd;              // invoked command
    RXSTRING       retstr;                // passed back result
    wholenumber_t  sbrc;                  // direct numeric return code
    char default_return_buffer[DEFRXSTRING];
    unsigned short flags;                 // command status flags
};
 
 
class ContextCommandHandlerDispatcher : public CallbackDispatcher
{
public:
    inline ContextCommandHandlerDispatcher(REXXPFN e, RexxString *a, RexxString *c, ProtectedObject &r, ProtectedObject &co) :
        entryPoint(e), address(a), command(c), result(r), condition(co) { }
    virtual ~ContextCommandHandlerDispatcher() { ; }
 
    virtual void run();
    virtual void handleError(RexxDirectory *);
 
    REXXPFN   entryPoint;                 // the installed command handler
    RexxString *address;                  // the address environment
    RexxString *command;                  // the command to invoke
    ProtectedObject &result;              // the handled result
    ProtectedObject &condition;           // any raised condition
};
 
#endif