Trie Index changes for retreiving metadata through catalog tool and
[csql.git] / include / Expression.h
blob43ecb9c84f5531d059c8e72b8fd7c21e7cfb4727
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16 #ifndef EXPRESSION_H
17 #define EXPRESSION_H
18 #include<os.h>
19 #include<DataType.h>
20 #include<Function.h>
22 class Table;
23 class TableImpl;
24 enum ArithOperator {
25 unKnownOperator = 0,
26 addition,
27 subtraction,
28 multiplication,
29 division,
30 modulus
32 class DllExport Expression
34 char fldName[IDENTIFIER_LENGTH];
35 void *tuple;
36 void *constVal;
37 void *calVal;
38 TableImpl *table;
39 ArithOperator arOp;
40 Expression *lhs;
41 Expression *rhs;
42 FunctionType fType;
43 DataType dType;
44 public:
45 Expression()
47 table=NULL; arOp = unKnownOperator; lhs=NULL; rhs=NULL;
48 tuple=NULL; constVal=NULL;
49 strcpy(fldName,"\0");
50 calVal = NULL;
51 fType = UNKNOWN_FUNCTION;
53 ~Expression()
55 if(lhs){ delete lhs; lhs=NULL;}
56 if(rhs){ delete rhs; rhs=NULL;}
58 void setTable(Table *tbl);
59 void setTuple(void *tpl);
60 bool isSingleTerm();
61 void setDataType(DataType type){dType = type;};
62 DataType getDataType(){ return dType;};
63 void setFunctionType(FunctionType type);
64 FunctionType getFunctionType() {return fType;}
65 void copyFunctionVal(void *dest,void *src, FunctionType type, int length);
66 void *evaluateAndGetValPtr(void *lhsResult, void *rhsResult);
67 void setExpr(Expression* exp1, FunctionType type,Expression* exp2);
68 void setExpr(char const *name,ArithOperator op,void *cVal );
69 void setExpr(char const *name);
70 void setExpr(Expression *exp1, ArithOperator op, Expression *exp2 );
71 void setExpr(void *cVal,bool flag );
72 void *evaluate(DataType type,bool &result);
73 void *evaluateForFunction(DataType type);
74 void solve(void *opand1, void *opand2, DataType type, ArithOperator arOp);
75 void convertStrToVal(DataType type);
76 void freeVal();
77 void memFree();
80 #endif