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149 lines
3.1 KiB
C++
149 lines
3.1 KiB
C++
/* ---------------------------------------------------------------------------
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Nullsoft Database Engine
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--------------------
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codename: Near Death Experience
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--------------------------------------------------------------------------- */
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/* ---------------------------------------------------------------------------
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IndexRecord Class
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--------------------------------------------------------------------------- */
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#include "IndexRecord.h"
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#include "../nde.h"
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#include <stdio.h>
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IndexRecord::IndexRecord(int RecordPos, int insertionPoint, VFILE *TableHandle, Table *ParentTable)
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{
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InsertionPoint = insertionPoint;
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if (RecordPos != 0)
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{
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int n=0;
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uint32_t ThisPos = RecordPos;
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while (ThisPos)
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{
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if (n >= 128)
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break;
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Vfseek(TableHandle, ThisPos, SEEK_SET);
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Field Entry (ThisPos);
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Field *TypedEntry = Entry.ReadField(ParentTable, ThisPos, &ThisPos);
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if (!TypedEntry) break; // some db error?
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AddField(TypedEntry);
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// ThisPos = TypedEntry->GetNextFieldPos();
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n++;
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}
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}
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}
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void IndexRecord::BuildCollaboration()
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{
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for (FieldList::iterator itr=Fields.begin();itr!=Fields.end();itr++)
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{
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IndexField *p = (IndexField *)*itr;
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if (p->next)
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p->index->Colaborate((IndexField *)p->next);
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else
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p->index->Colaborate((IndexField *)*Fields.begin());
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}
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}
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bool IndexRecord::NeedFix()
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{
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for (FieldList::iterator itr=Fields.begin();itr!=Fields.end();itr++)
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{
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IndexField *p = (IndexField *)*itr;
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if (p->index->NeedFix())
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return true;
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}
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return false;
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}
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IndexField *IndexRecord::GetIndexByName(const char *name)
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{
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for (FieldList::iterator itr=Fields.begin();itr!=Fields.end();itr++)
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{
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IndexField *p = (IndexField *)*itr;
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if (!strcasecmp(p->GetIndexName(), name))
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return p;
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}
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return NULL;
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}
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bool IndexRecord::CheckIndexing(int v)
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{
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int i = v;
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for (FieldList::iterator itr=Fields.begin();itr!=Fields.end();itr++)
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{
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IndexField *p = (IndexField *)*itr;
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v = p->index->GetCooperative(v);
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}
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return v == i;
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}
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Field *RecordBase::GetField(unsigned char ID)
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{
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for (FieldList::iterator itr=Fields.begin();itr!=Fields.end();itr++)
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{
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IndexField *p = (IndexField *)*itr;
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if (p->GetFieldId() == ID)
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return p;
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}
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return NULL;
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}
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void RecordBase::AddField(Field *field)
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{
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if (!field) return;
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if (GetField(field->ID))
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return;
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Fields.push_back(field);
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}
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int IndexRecord::WriteFields(Table *ParentTable)
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{
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Field *previous = 0;
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for (FieldList::iterator itr=Fields.begin();itr!=Fields.end();itr++)
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{
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IndexField *p = (IndexField *)*itr;
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p->WriteField(ParentTable, previous, (Field *)p->next);
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previous = p;
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}
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return WriteIndex(ParentTable);
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}
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int IndexRecord::WriteIndex(Table *ParentTable)
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{
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int P=0;
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if (!Fields.empty())
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P=(*Fields.begin())->GetFieldPos();
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return ParentTable->index->Update(INDEX_RECORD_NUM, P, this, false);
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}
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void RecordBase::RemoveField(Field *field)
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{
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if (!field)
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return;
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Fields.erase(field);
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delete field;
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}
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void IndexRecord::WalkFields(FieldsWalker callback, void *context)
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{
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if (callback)
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{
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for (FieldList::iterator itr=Fields.begin();itr!=Fields.end();itr++)
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{
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if (!callback(this, *itr, context))
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break;
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}
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}
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}
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