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haiku/headers/os/app/Message.h
Axel Dörfler 7a9c00732a BMessage: add default parameter to GetString()/GetBool(). 
* It's likely that you want NULL/false when the data is not available
  so you can now leave out the default value in that case.
2015-03-27 13:21:48 +01:00

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/*
* Copyright 2005-2015 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 <new>
#include <BeBuild.h>
#include <DataIO.h>
#include <Flattenable.h>
#include <OS.h>
#include <Rect.h>
#include <Size.h>
#include <AppDefs.h> /* For convenience */
#include <TypeConstants.h> /* For convenience */
class BAlignment;
class BBlockCache;
class BMessenger;
class BHandler;
class BString;
class BStringList;
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;
status_t GetInfo(const char* name, type_code* typeFound,
int32* countFound, 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* 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 AddAlignment(const char* name,
const BAlignment& alignment);
status_t AddRect(const char* name, BRect rect);
status_t AddPoint(const char* name, BPoint point);
status_t AddSize(const char* name, BSize size);
status_t AddString(const char* name, const char* string);
status_t AddString(const char* name,
const BString& string);
status_t AddStrings(const char* name,
const BStringList& list);
status_t AddInt8(const char* name, int8 value);
status_t AddUInt8(const char* name, uint8 value);
status_t AddInt16(const char* name, int16 value);
status_t AddUInt16(const char* name, uint16 value);
status_t AddInt32(const char* name, int32 value);
status_t AddUInt32(const char* name, uint32 value);
status_t AddInt64(const char* name, int64 value);
status_t AddUInt64(const char* name, uint64 value);
status_t AddBool(const char* name, bool value);
status_t AddFloat(const char* name, float value);
status_t AddDouble(const char* name, double value);
status_t AddPointer(const char* name,
const void* pointer);
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 AddFlat(const char* name,
const 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);
status_t Append(const BMessage& message);
// Removing data
status_t RemoveData(const char* name, int32 index = 0);
status_t RemoveName(const char* name);
status_t MakeEmpty();
// Finding data
status_t FindAlignment(const char* name,
BAlignment* alignment) const;
status_t FindAlignment(const char* name, int32 index,
BAlignment* alignment) const;
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 FindSize(const char* name, BSize* size) const;
status_t FindSize(const char* name, int32 index,
BSize* size) 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 FindStrings(const char* name,
BStringList* list) const;
status_t FindInt8(const char* name, int8* value) const;
status_t FindInt8(const char* name, int32 index,
int8* value) const;
status_t FindUInt8(const char* name, uint8* value) const;
status_t FindUInt8(const char* name, int32 index,
uint8* value) const;
status_t FindInt16(const char* name, int16* value) const;
status_t FindInt16(const char* name, int32 index,
int16* value) const;
status_t FindUInt16(const char* name,
uint16* value) const;
status_t FindUInt16(const char* name, int32 index,
uint16* value) const;
status_t FindInt32(const char* name, int32* value) const;
status_t FindInt32(const char* name, int32 index,
int32* value) const;
status_t FindUInt32(const char* name,
uint32* value) const;
status_t FindUInt32(const char* name, int32 index,
uint32* value) const;
status_t FindInt64(const char* name, int64* value) const;
status_t FindInt64(const char* name, int32 index,
int64* value) const;
status_t FindUInt64(const char* name,
uint64* value) const;
status_t FindUInt64(const char* name, int32 index,
uint64* 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 ReplaceAlignment(const char* name,
const BAlignment& alignment);
status_t ReplaceAlignment(const char* name, int32 index,
const BAlignment& alignment);
status_t ReplaceRect(const char* name, BRect rect);
status_t ReplaceRect(const char* name, int32 index,
BRect rect);
status_t ReplacePoint(const char* name, BPoint aPoint);
status_t ReplacePoint(const char* name, int32 index,
BPoint aPoint);
status_t ReplaceSize(const char* name, BSize aSize);
status_t ReplaceSize(const char* name, int32 index,
BSize aSize);
status_t ReplaceString(const char* name,
const char* string);
status_t ReplaceString(const char* name, int32 index,
const char* string);
status_t ReplaceString(const char* name,
const BString& string);
status_t ReplaceString(const char* name, int32 index,
const BString& string);
status_t ReplaceInt8(const char* name, int8 value);
status_t ReplaceInt8(const char* name, int32 index,
int8 value);
status_t ReplaceUInt8(const char* name, uint8 value);
status_t ReplaceUInt8(const char* name, int32 index,
uint8 value);
status_t ReplaceInt16(const char* name, int16 value);
status_t ReplaceInt16(const char* name, int32 index,
int16 value);
status_t ReplaceUInt16(const char* name, uint16 value);
status_t ReplaceUInt16(const char* name, int32 index,
uint16 value);
status_t ReplaceInt32(const char* name, int32 value);
status_t ReplaceInt32(const char* name, int32 index,
int32 value);
status_t ReplaceUInt32(const char* name, uint32 value);
status_t ReplaceUInt32(const char* name, int32 index,
uint32 value);
status_t ReplaceInt64(const char* name, int64 value);
status_t ReplaceInt64(const char* name, int32 index,
int64 value);
status_t ReplaceUInt64(const char* name, uint64 value);
status_t ReplaceUInt64(const char* name, int32 index,
uint64 value);
status_t ReplaceBool(const char* name, bool aBoolean);
status_t ReplaceBool(const char* name, int32 index,
bool value);
status_t ReplaceFloat(const char* name, float value);
status_t ReplaceFloat(const char* name, int32 index,
float value);
status_t ReplaceDouble(const char* name, double value);
status_t ReplaceDouble(const char* name, int32 index,
double value);
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);
// Comparing data - Haiku experimental API
bool HasSameData(const BMessage& other,
bool ignoreFieldOrder = true,
bool deep = false) const;
void* operator new(size_t size);
void* operator new(size_t, void* pointer);
void* operator new(size_t,
const std::nothrow_t& noThrow);
void operator delete(void* pointer, size_t size);
// Private, reserved, or obsolete
bool HasAlignment(const char* name,
int32 n = 0) const;
bool HasRect(const char* name, int32 n = 0) const;
bool HasPoint(const char* name, int32 n = 0) const;
bool HasSize(const char* name, int32 n = 0) const;
bool HasString(const char* name, int32 n = 0) const;
bool HasInt8(const char* name, int32 n = 0) const;
bool HasUInt8(const char* name, int32 n = 0) const;
bool HasInt16(const char* name, int32 n = 0) const;
bool HasUInt16(const char* name, int32 n = 0) const;
bool HasInt32(const char* name, int32 n = 0) const;
bool HasUInt32(const char* name, int32 n = 0) const;
bool HasInt64(const char* name, int32 n = 0) const;
bool HasUInt64(const char* name, int32 n = 0) const;
bool HasBool(const char* name, int32 n = 0) const;
bool HasFloat(const char* name, int32 n = 0) const;
bool HasDouble(const char* name, int32 n = 0) const;
bool HasPointer(const char* name, int32 n = 0) const;
bool HasMessenger(const char* name,
int32 n = 0) const;
bool HasRef(const char* name, int32 n = 0) const;
bool HasMessage(const char* name, int32 n = 0) const;
bool HasFlat(const char* name,
const BFlattenable* object) const;
bool HasFlat(const char* name, int32 n,
const BFlattenable* object) const;
bool HasData(const char* name, type_code ,
int32 n = 0) const;
BRect FindRect(const char* name, int32 n = 0) const;
BPoint FindPoint(const char* name, int32 n = 0) const;
const char* FindString(const char* name, int32 n = 0) const;
int8 FindInt8(const char* name, int32 n = 0) const;
int16 FindInt16(const char* name, int32 n = 0) const;
int32 FindInt32(const char* name, int32 n = 0) const;
int64 FindInt64(const char* name, int32 n = 0) const;
bool FindBool(const char* name, int32 n = 0) const;
float FindFloat(const char* name, int32 n = 0) const;
double FindDouble(const char* name, int32 n = 0) const;
// Convenience methods
bool GetBool(const char* name,
bool defaultValue = false) const;
bool GetBool(const char* name, int32 index,
bool defaultValue) const;
int8 GetInt8(const char* name,
int8 defaultValue) const;
int8 GetInt8(const char* name, int32 index,
int8 defaultValue) const;
uint8 GetUInt8(const char* name,
uint8 defaultValue) const;
uint8 GetUInt8(const char* name, int32 index,
uint8 defaultValue) const;
int16 GetInt16(const char* name,
int16 defaultValue) const;
int16 GetInt16(const char* name, int32 index,
int16 defaultValue) const;
uint16 GetUInt16(const char* name,
uint16 defaultValue) const;
uint16 GetUInt16(const char* name, int32 index,
uint16 defaultValue) const;
int32 GetInt32(const char* name,
int32 defaultValue) const;
int32 GetInt32(const char* name, int32 index,
int32 defaultValue) const;
uint32 GetUInt32(const char* name,
uint32 defaultValue) const;
uint32 GetUInt32(const char* name, int32 index,
uint32 defaultValue) const;
int64 GetInt64(const char* name,
int64 defaultValue) const;
int64 GetInt64(const char* name, int32 index,
int64 defaultValue) const;
uint64 GetUInt64(const char* name,
uint64 defaultValue) const;
uint64 GetUInt64(const char* name, int32 index,
uint64 defaultValue) const;
float GetFloat(const char* name,
float defaultValue) const;
float GetFloat(const char* name, int32 index,
float defaultValue) const;
double GetDouble(const char* name,
double defaultValue) const;
double GetDouble(const char* name, int32 index,
double defaultValue) const;
const char* GetString(const char* name,
const char* defaultValue = NULL) const;
const char* GetString(const char* name, int32 index,
const char* defaultValue) const;
BAlignment GetAlignment(const char* name, int32 index,
const BAlignment& defaultValue) const;
BAlignment GetAlignment(const char* name,
const BAlignment& defaultValue) const;
BRect GetRect(const char* name, int32 index,
const BRect& defaultValue) const;
BRect GetRect(const char* name,
const BRect& defaultValue) const;
BPoint GetPoint(const char* name, int32 index,
const BPoint& defaultValue) const;
BPoint GetPoint(const char* name,
const BPoint& defaultValue) const;
BSize GetSize(const char* name, int32 index,
const BSize& defaultValue) const;
BSize GetSize(const char* name,
const BSize& defaultValue) const;
// fixed size fields only
status_t SetBool(const char* name, bool value);
status_t SetInt8(const char* name, int8 value);
status_t SetUInt8(const char* name, uint8 value);
status_t SetInt16(const char* name, int16 value);
status_t SetUInt16(const char* name, uint16 value);
status_t SetInt32(const char* name, int32 value);
status_t SetUInt32(const char* name, uint32 value);
status_t SetInt64(const char* name, int64 value);
status_t SetUInt64(const char* name, uint64 value);
status_t SetPointer(const char* name, const void* value);
status_t SetString(const char* name, const char* string);
status_t SetString(const char* name,
const BString& string);
status_t SetFloat(const char* name, float value);
status_t SetDouble(const char* name, double value);
status_t SetAlignment(const char* name,
const BAlignment& value);
status_t SetPoint(const char* name, const BPoint& value);
status_t SetRect(const char* name, const BRect& value);
status_t SetSize(const char* name, const BSize& value);
status_t SetData(const char* name, type_code type,
const void* data, ssize_t numBytes,
bool fixedSize = true, int count = 1);
class Private;
struct message_header;
struct field_header;
private:
friend class Private;
friend class BMessageQueue;
status_t _InitCommon(bool initHeader);
status_t _InitHeader();
status_t _Clear();
status_t _FlattenToArea(message_header** _header) const;
status_t _CopyForWrite();
status_t _Reference();
status_t _Dereference();
status_t _ValidateMessage();
void _UpdateOffsets(uint32 offset, int32 change);
status_t _ResizeData(uint32 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);
void _PrintToStream(const char* indent) const;
private:
BMessage(BMessage* message);
// deprecated
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 _StaticReInitForkedChild();
static void _StaticCleanup();
static void _StaticCacheCleanup();
static int32 _StaticGetCachedReplyPort();
private:
message_header* fHeader;
field_header* fFields;
uint8* fData;
uint32 fFieldsAvailable;
size_t fDataAvailable;
mutable BMessage* fOriginal;
BMessage* fQueueLink;
// fQueueLink is used by BMessageQueue to build a linked list
void* fArchivingPointer;
uint32 fReserved[8];
enum { sNumReplyPorts = 3 };
static port_id sReplyPorts[sNumReplyPorts];
static int32 sReplyPortInUse[sNumReplyPorts];
static int32 sGetCachedReplyPort();
static BBlockCache* sMsgCache;
};
#endif // _MESSAGE_H
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