| 1 | // File: LDOM_OSStream.hxx |
| 2 | // Created: 01.10.01 10:56:06 |
| 3 | // Author: Julia DOROVSKIKH |
| 4 | // Copyright: Open Cascade 2001 |
| 5 | |
| 6 | #ifndef LDOM_OSStream_HeaderFile |
| 7 | #define LDOM_OSStream_HeaderFile |
| 8 | |
| 9 | // This implementation allows to increase performance |
| 10 | // of outputting data into a string |
| 11 | // avoiding reallocation of buffer. |
| 12 | // |
| 13 | // class LDOM_OSStream implements output into a sequence of |
| 14 | // strings and getting the result as a string. |
| 15 | // It inherits Standard_OStream (ostream). |
| 16 | // Beside methods of ostream, it also has additional |
| 17 | // useful methods: str(), Length() and Clear(). |
| 18 | // |
| 19 | // struct LDOM_StringElem is one element of internal sequence |
| 20 | // |
| 21 | // class LDOM_SBuffer inherits streambuf and |
| 22 | // redefines some virtual methods of it |
| 23 | // (overflow() and xsputn()) |
| 24 | // This class contains pointers on first |
| 25 | // and current element of sequence, |
| 26 | // also it has methods for the sequence management. |
| 27 | |
| 28 | #include <Standard_OStream.hxx> |
| 29 | #include <Standard_Boolean.hxx> |
| 30 | |
| 31 | #include <stdlib.h> |
| 32 | #include <stdio.h> /* EOF */ |
| 33 | |
| 34 | class LDOM_StringElem; // defined in cxx file |
| 35 | |
| 36 | class LDOM_SBuffer : public streambuf |
| 37 | { |
| 38 | public: |
| 39 | Standard_EXPORT LDOM_SBuffer (const Standard_Integer theMaxBuf); |
| 40 | // Constructor. Sets a default value for the |
| 41 | // length of each sequence element. |
| 42 | |
| 43 | Standard_EXPORT Standard_CString str () const; |
| 44 | // Concatenates strings of all sequence elements |
| 45 | // into one string. Space for output string is allocated |
| 46 | // with operator new. |
| 47 | // Caller of this function is responsible |
| 48 | // for memory release after the string usage. |
| 49 | |
| 50 | Standard_Integer Length () const {return myLength;}; |
| 51 | // Returns full length of data contained |
| 52 | |
| 53 | Standard_EXPORT void Clear (); |
| 54 | // Clears first element of sequence and removes all others |
| 55 | |
| 56 | // Methods of streambuf |
| 57 | |
| 58 | Standard_EXPORT virtual int overflow(int c = EOF); |
| 59 | Standard_EXPORT virtual int underflow(); |
| 60 | //virtual int uflow(); |
| 61 | |
| 62 | Standard_EXPORT virtual int xsputn(const char* s, int n); |
| 63 | //virtual int xsgetn(char* s, int n); |
| 64 | //virtual int sync(); |
| 65 | |
| 66 | Standard_EXPORT ~LDOM_SBuffer (); |
| 67 | // Destructor |
| 68 | |
| 69 | private: |
| 70 | Standard_Integer myMaxBuf; // default length of one element |
| 71 | Standard_Integer myLength; // full length of contained data |
| 72 | LDOM_StringElem* myFirstString; // the head of the sequence |
| 73 | LDOM_StringElem* myCurString; // current element of the sequence |
| 74 | }; |
| 75 | |
| 76 | class LDOM_OSStream : public Standard_OStream |
| 77 | { |
| 78 | public: |
| 79 | Standard_EXPORT LDOM_OSStream (const Standard_Integer theMaxBuf); |
| 80 | // Constructor |
| 81 | |
| 82 | Standard_CString str () const {return myBuffer.str();}; |
| 83 | |
| 84 | Standard_Integer Length () const {return myBuffer.Length();}; |
| 85 | |
| 86 | void Clear () { myBuffer.Clear(); }; |
| 87 | |
| 88 | private: |
| 89 | LDOM_SBuffer myBuffer; |
| 90 | }; |
| 91 | |
| 92 | #endif |