This stream makes possible to reuse a BufferedStream, so each usage maintains a different cursor position.
| 43 | // This stream makes possible to reuse a BufferedStream, so each usage maintains a different |
| 44 | // cursor position. |
| 45 | class BufferedStreamWindow : public BaseBufferedStream |
| 46 | { |
| 47 | struct Impure : public RecordSource::Impure |
| 48 | { |
| 49 | FB_UINT64 irsb_position; |
| 50 | }; |
| 51 | |
| 52 | public: |
| 53 | BufferedStreamWindow(CompilerScratch* csb, BufferedStream* next); |
| 54 | |
| 55 | void internalOpen(thread_db* tdbb) const override; |
| 56 | void close(thread_db* tdbb) const override; |
| 57 | |
| 58 | bool internalGetRecord(thread_db* tdbb) const override; |
| 59 | bool refetchRecord(thread_db* tdbb) const override; |
| 60 | WriteLockResult lockRecord(thread_db* tdbb) const override; |
| 61 | |
| 62 | void getChildren(Firebird::Array<const RecordSource*>& children) const override; |
| 63 | |
| 64 | void print(thread_db* tdbb, Firebird::string& plan, bool detailed, unsigned level, bool recurse) const override; |
| 65 | |
| 66 | void markRecursive() override; |
| 67 | void invalidateRecords(Request* request) const override; |
| 68 | |
| 69 | void findUsedStreams(StreamList& streams, bool expandAll) const override; |
| 70 | bool isDependent(const StreamList& streams) const override; |
| 71 | void nullRecords(thread_db* tdbb) const override; |
| 72 | |
| 73 | void locate(thread_db* tdbb, FB_UINT64 position) const override |
| 74 | { |
| 75 | Request* const request = tdbb->getRequest(); |
| 76 | Impure* const impure = request->getImpure<Impure>(m_impure); |
| 77 | impure->irsb_position = position; |
| 78 | } |
| 79 | |
| 80 | FB_UINT64 getCount(thread_db* tdbb) const override |
| 81 | { |
| 82 | return m_next->getCount(tdbb); |
| 83 | } |
| 84 | |
| 85 | FB_UINT64 getPosition(Request* request) const override |
| 86 | { |
| 87 | Impure* const impure = request->getImpure<Impure>(m_impure); |
| 88 | return impure->irsb_position; |
| 89 | } |
| 90 | |
| 91 | public: |
| 92 | NestConst<BufferedStream> m_next; |
| 93 | }; |
| 94 | |
| 95 | // BufferedStreamWindow implementation |
| 96 |