Exp (Pentaho Community Edition Project: mondrian 9.3.0.0-424 API)

All Known Subinterfaces:

FunCall

All Known Implementing Classes:

DimensionExpr, DummyExp, ExpBase, HierarchyExpr, Id, LevelExpr, Literal, MemberExpr, NamedSetExpr, ParameterExpr, ResolvedFunCall, UnresolvedFunCall
```
public interface Exp
```
An Exp is an MDX expression.

Since:

1.0

Author:

jhyde, 20 January, 1999

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Calc`	`accept(ExpCompiler compiler)`	Converts this expression into an a tree of expressions which can be efficiently evaluated.
`Object`	`accept(MdxVisitor visitor)`	Accepts a visitor to this Exp.
`Exp`	`accept(Validator validator)`	Validates this expression.
`Exp`	`clone()`
`int`	`getCategory()`	Returns the `Category` of the expression.
`Type`	`getType()`	Returns the type of this expression.
`void`	`unparse(PrintWriter pw)`	Writes the MDX representation of this expression to a print writer.

- Method Detail
  - clone
```
Exp clone()
```
  - getCategory
```
int getCategory()
```
    Returns the Category of the expression.
  - getType
```
Type getType()
```
    Returns the type of this expression. Never null.
  - unparse
```
void unparse(PrintWriter pw)
```
    Writes the MDX representation of this expression to a print writer. Sub-expressions are invoked recursively.
    
    Parameters:
    
    pw - PrintWriter
  - accept
```
Exp accept(Validator validator)
```
    Validates this expression. The validator acts in the role of 'visitor' (see Gang of Four 'visitor pattern'), and an expression in the role of 'visitee'.
    
    Parameters:
    
    validator - Validator contains validation context
    
    Returns:
    
    The validated expression; often but not always the same as this expression
  - accept
```
Calc accept(ExpCompiler compiler)
```
    Converts this expression into an a tree of expressions which can be efficiently evaluated.
    
    Parameters:
    
    compiler -
    
    Returns:
    
    A compiled expression
  - accept
```
Object accept(MdxVisitor visitor)
```
    Accepts a visitor to this Exp. The implementation should generally dispatches to the MdxVisitor.visit(mondrian.olap.Query) method appropriate to the type of expression.
    
    Parameters:
    
    visitor - Visitor