haiku/headers/os/app/Message.h

/*
 * Copyright 2005-2007, Haiku Inc. All Rights Reserved.
 * Distributed under the terms of the MIT License.
 *
 * Authors:
 *	Michael Lotz <mmlr@mlotz.ch>
 */
#ifndef _MESSAGE_H
#define _MESSAGE_H


#include <BeBuild.h>
#include <DataIO.h>
#include <Flattenable.h>
#include <OS.h>
#include <Rect.h>

#include <AppDefs.h>		/* For convenience */
#include <TypeConstants.h>	/* For convenience */

class BBlockCache;
class BMessenger;
class BHandler;
class BString;
struct entry_ref;


// Name lengths and Scripting specifiers
#define B_FIELD_NAME_LENGTH			255
#define B_PROPERTY_NAME_LENGTH		255

enum {
	B_NO_SPECIFIER = 0,
	B_DIRECT_SPECIFIER = 1,
	B_INDEX_SPECIFIER,
	B_REVERSE_INDEX_SPECIFIER,
	B_RANGE_SPECIFIER,
	B_REVERSE_RANGE_SPECIFIER,
	B_NAME_SPECIFIER,
	B_ID_SPECIFIER,

	B_SPECIFIERS_END = 128
	// app-defined specifiers start at B_SPECIFIERS_END + 1
};

class BMessage {
	public:
		uint32			what;

						BMessage();
						BMessage(uint32 what);
						BMessage(const BMessage &other);
		virtual			~BMessage();

		BMessage		&operator=(const BMessage &other);

		// Statistics and misc info
		status_t		GetInfo(type_code typeRequested, int32 index,
							char **nameFound, type_code *typeFound,
							int32 *countFound = NULL) const;
		status_t		GetInfo(const char *name, type_code *typeFound,
							int32 *countFound = NULL) const;
		status_t		GetInfo(const char *name, type_code *typeFound,
							bool *fixedSize) const;

		int32			CountNames(type_code type) const;
		bool			IsEmpty() const;
		bool			IsSystem() const;
		bool			IsReply() const;
		void			PrintToStream() const;

		status_t		Rename(const char *oldEntry, const char *newEntry);

		// Delivery info
		bool			WasDelivered() const;
		bool			IsSourceWaiting() const;
		bool			IsSourceRemote() const;
		BMessenger		ReturnAddress() const;
		const BMessage	*Previous() const;
		bool			WasDropped() const;
		BPoint			DropPoint(BPoint *offset = NULL) const;

		// Replying
		status_t		SendReply(uint32 command, BHandler *replyTo = NULL);
		status_t		SendReply(BMessage *reply, BHandler *replyTo = NULL,
							bigtime_t timeout = B_INFINITE_TIMEOUT);
		status_t		SendReply(BMessage *reply, BMessenger replyTo,
							bigtime_t timeout = B_INFINITE_TIMEOUT);
	
		status_t		SendReply(uint32 command, BMessage *replyToReply);
		status_t		SendReply(BMessage *the_reply, BMessage *replyToReply,
							bigtime_t sendTimeout = B_INFINITE_TIMEOUT,
							bigtime_t replyTimeout = B_INFINITE_TIMEOUT);

		// Flattening data
		ssize_t			FlattenedSize() const;
		status_t		Flatten(char *buffer, ssize_t size) const;
		status_t		Flatten(BDataIO *stream, ssize_t *size = NULL) const;
		status_t		Unflatten(const char *flatBuffer);
		status_t		Unflatten(BDataIO *stream);

		// Specifiers (scripting)
		status_t		AddSpecifier(const char *property);
		status_t		AddSpecifier(const char *property, int32 index);
		status_t		AddSpecifier(const char *property, int32 index, int32 range);
		status_t		AddSpecifier(const char *property, const char *name);
		status_t		AddSpecifier(const BMessage *specifier);

		status_t		SetCurrentSpecifier(int32 index);
		status_t		GetCurrentSpecifier(int32 *index,
							BMessage *specifier = NULL, int32 *what = NULL,
							const char **property = NULL) const;
		bool			HasSpecifiers() const;
		status_t		PopSpecifier();

		// Adding data
		status_t		AddRect(const char *name, BRect aRect);
		status_t		AddPoint(const char *name, BPoint aPoint);
		status_t		AddString(const char *name, const char *aString);
		status_t		AddString(const char *name, const BString &aString);
		status_t		AddInt8(const char *name, int8 value);
		status_t		AddInt16(const char *name, int16 value);
		status_t		AddInt32(const char *name, int32 value);
		status_t		AddInt64(const char *name, int64 value);
		status_t		AddBool(const char *name, bool aBoolean);
		status_t		AddFloat(const char *name, float aFloat);
		status_t		AddDouble(const char *name, double aDouble);
		status_t		AddPointer(const char *name, const void *aPointer);
		status_t		AddMessenger(const char *name, BMessenger messenger);
		status_t		AddRef(const char *name, const entry_ref *ref);
		status_t		AddMessage(const char *name, const BMessage *message);
		status_t		AddFlat(const char *name, BFlattenable *object,
							int32 count = 1);
		status_t		AddData(const char *name, type_code type,
							const void *data, ssize_t numBytes,
							bool isFixedSize = true, int32 count = 1);

		// Removing data
		status_t		RemoveData(const char *name, int32 index = 0);
		status_t		RemoveName(const char *name);
		status_t		MakeEmpty();

		// Finding data
		status_t		FindRect(const char *name, BRect *rect) const;
		status_t		FindRect(const char *name, int32 index, BRect *rect) const;
		status_t		FindPoint(const char *name, BPoint *point) const;
		status_t		FindPoint(const char *name, int32 index, BPoint *point) const;
		status_t		FindString(const char *name, const char **string) const;
		status_t		FindString(const char *name, int32 index, const char **string) const;
		status_t		FindString(const char *name, BString *string) const;
		status_t		FindString(const char *name, int32 index, BString *string) const;
		status_t		FindInt8(const char *name, int8 *value) const;
		status_t		FindInt8(const char *name, int32 index, int8 *value) const;
		status_t		FindInt16(const char *name, int16 *value) const;
		status_t		FindInt16(const char *name, int32 index, int16 *value) const;
		status_t		FindInt32(const char *name, int32 *value) const;
		status_t		FindInt32(const char *name, int32 index, int32 *value) const;
		status_t		FindInt64(const char *name, int64 *value) const;
		status_t		FindInt64(const char *name, int32 index, int64 *value) const;
		status_t		FindBool(const char *name, bool *value) const;
		status_t		FindBool(const char *name, int32 index, bool *value) const;
		status_t		FindFloat(const char *name, float *value) const;
		status_t		FindFloat(const char *name, int32 index, float *value) const;
		status_t		FindDouble(const char *name, double *value) const;
		status_t		FindDouble(const char *name, int32 index, double *value) const;
		status_t		FindPointer(const char *name, void **pointer) const;
		status_t		FindPointer(const char *name, int32 index,  void **pointer) const;
		status_t		FindMessenger(const char *name, BMessenger *messenger) const;
		status_t		FindMessenger(const char *name, int32 index, BMessenger *messenger) const;
		status_t		FindRef(const char *name, entry_ref *ref) const;
		status_t		FindRef(const char *name, int32 index, entry_ref *ref) const;
		status_t		FindMessage(const char *name, BMessage *message) const;
		status_t		FindMessage(const char *name, int32 index, BMessage *message) const;
		status_t		FindFlat(const char *name, BFlattenable *object) const;
		status_t		FindFlat(const char *name, int32 index, BFlattenable *object) const;
		status_t		FindData(const char *name, type_code type,
							const void **data, ssize_t *numBytes) const;
		status_t		FindData(const char *name, type_code type, int32 index,
							const void **data, ssize_t *numBytes) const;

		// Replacing data
		status_t		ReplaceRect(const char *name, BRect aRect);
		status_t		ReplaceRect(const char *name, int32 index, BRect aRect);
		status_t		ReplacePoint(const char *name, BPoint aPoint);
		status_t		ReplacePoint(const char *name, int32 index, BPoint aPoint);
		status_t		ReplaceString(const char *name, const char *aString);
		status_t		ReplaceString(const char *name, int32 index, const char *aString);
		status_t		ReplaceString(const char *name, const BString &aString);
		status_t		ReplaceString(const char *name, int32 index, const BString &aString);
		status_t		ReplaceInt8(const char *name, int8 value);
		status_t		ReplaceInt8(const char *name, int32 index, int8 value);
		status_t		ReplaceInt16(const char *name, int16 value);
		status_t		ReplaceInt16(const char *name, int32 index, int16 value);
		status_t		ReplaceInt32(const char *name, int32 value);
		status_t		ReplaceInt32(const char *name, int32 index, int32 value);
		status_t		ReplaceInt64(const char *name, int64 value);
		status_t		ReplaceInt64(const char *name, int32 index, int64 value);
		status_t		ReplaceBool(const char *name, bool aBoolean);
		status_t		ReplaceBool(const char *name, int32 index, bool aBoolean);
		status_t		ReplaceFloat(const char *name, float aFloat);
		status_t		ReplaceFloat(const char *name, int32 index, float aFloat);
		status_t		ReplaceDouble(const char *name, double aDouble);
		status_t		ReplaceDouble(const char *name, int32 index, double aDouble);
		status_t		ReplacePointer(const char *name, const void *pointer);
		status_t		ReplacePointer(const char *name,int32 index,const void *pointer);
		status_t		ReplaceMessenger(const char *name, BMessenger messenger);
		status_t		ReplaceMessenger(const char *name, int32 index, BMessenger messenger);
		status_t		ReplaceRef(	const char *name,const entry_ref *ref);
		status_t		ReplaceRef(	const char *name, int32 index, const entry_ref *ref);
		status_t		ReplaceMessage(const char *name, const BMessage *message);
		status_t		ReplaceMessage(const char *name, int32 index, const BMessage *message);
		status_t		ReplaceFlat(const char *name, BFlattenable *object);
		status_t		ReplaceFlat(const char *name, int32 index, BFlattenable *object);
		status_t		ReplaceData(const char *name, type_code type,
							const void *data, ssize_t numBytes);
		status_t		ReplaceData(const char *name, type_code type, int32 index,
							const void *data, ssize_t numBytes);

		void			*operator new(size_t size);
		void			*operator new(size_t, void *pointer);
		void			operator delete(void *pointer, size_t size);

		// Private, reserved, or obsolete
		bool			HasRect(const char *, int32 n = 0) const;
		bool			HasPoint(const char *, int32 n = 0) const;
		bool			HasString(const char *, int32 n = 0) const;
		bool			HasInt8(const char *, int32 n = 0) const;
		bool			HasInt16(const char *, int32 n = 0) const;
		bool			HasInt32(const char *, int32 n = 0) const;
		bool			HasInt64(const char *, int32 n = 0) const;
		bool			HasBool(const char *, int32 n = 0) const;
		bool			HasFloat(const char *, int32 n = 0) const;
		bool			HasDouble(const char *, int32 n = 0) const;
		bool			HasPointer(const char *, int32 n = 0) const;
		bool			HasMessenger(const char *, int32 n = 0) const;
		bool			HasRef(const char *, int32 n = 0) const;
		bool			HasMessage(const char *, int32 n = 0) const;
		bool			HasFlat(const char *, const BFlattenable *) const;
		bool			HasFlat(const char *, int32 n, const BFlattenable *) const;
		bool			HasData(const char *, type_code , int32 n = 0) const;
		BRect			FindRect(const char *, int32 n = 0) const;
		BPoint			FindPoint(const char *, int32 n = 0) const;
		const char		*FindString(const char *, int32 n = 0) const;
		int8			FindInt8(const char *, int32 n = 0) const;
		int16			FindInt16(const char *, int32 n = 0) const;
		int32			FindInt32(const char *, int32 n = 0) const;
		int64			FindInt64(const char *, int32 n = 0) const;
		bool			FindBool(const char *, int32 n = 0) const;
		float			FindFloat(const char *, int32 n = 0) const;
		double			FindDouble(const char *, int32 n = 0) const;

		class Private;
		struct message_header;
		struct field_header;

	private:
		friend class Private;
		friend class BMessageQueue;

		status_t		_InitCommon();
		status_t		_InitHeader();
		status_t		_Clear();

		status_t		_FlattenToArea(message_header **_header) const;
		status_t		_CopyForWrite();
		status_t		_Reference(message_header *header);
		status_t		_Dereference();

		status_t		_ResizeData(int32 offset, int32 change);

		uint32			_HashName(const char* name) const;
		status_t		_FindField(const char* name, type_code type,
							field_header** _result) const;
		status_t		_AddField(const char* name, type_code type,
							bool isFixedSize, field_header** _result);
		status_t		_RemoveField(field_header* field);

		ssize_t			_NativeFlattenedSize() const;
		status_t		_NativeFlatten(char *buffer, ssize_t size) const;
		status_t		_NativeFlatten(BDataIO *stream, ssize_t *size = NULL) const;
		void			_PrintToStream(const char* indent) const;

	private:
		message_header*	fHeader;
		field_header*	fFields;
		uint8*			fData;
		area_id			fClonedArea;

		mutable	BMessage* fOriginal;

		BMessage*		fQueueLink;
			// fQueueLink is used by BMessageQueue to build a linked list

		uint32			fReserved[10];

						// deprecated
						BMessage(BMessage *message);

		virtual	void	_ReservedMessage1();
		virtual	void	_ReservedMessage2();
		virtual	void	_ReservedMessage3();

		status_t		_SendMessage(port_id port, team_id portOwner, int32 token,
							bigtime_t timeout, bool replyRequired,
							BMessenger &replyTo) const;
		status_t		_SendMessage(port_id port, team_id portOwner,
							int32 token, BMessage *reply, bigtime_t sendTimeout,
							bigtime_t replyTimeout) const;
		static status_t	_SendFlattenedMessage(void *data, int32 size,
							port_id port, int32 token, bigtime_t timeout);

		static void		_StaticInit();
		static void		_StaticCleanup();
		static void		_StaticCacheCleanup();
		static int32	_StaticGetCachedReplyPort();

		enum			{ sNumReplyPorts = 3 };
		static port_id	sReplyPorts[sNumReplyPorts];
		static long		sReplyPortInUse[sNumReplyPorts];
		static int32	sGetCachedReplyPort();

		static BBlockCache* sMsgCache;
};

#endif	// _MESSAGE_H