mondrian.calc
Class DummyExp

java.lang.Object
  mondrian.calc.DummyExp

All Implemented Interfaces:

Exp

public class DummyExp
extends Object
implements Exp

Dummy expression which exists only to wrap a Type.

Since:

Sep 26, 2005

Author:

jhyde

Constructor Summary

DummyExp(Type type)

Method Summary

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.
DummyExp	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.

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DummyExp

public DummyExp(Type type)

Method Detail

clone

public DummyExp clone()

Specified by:

clone in interface Exp

Overrides:

clone in class Object

getCategory

public int getCategory()

Description copied from interface: Exp

Returns the Category of the expression.

Specified by:

getCategory in interface Exp

getType

public Type getType()

Description copied from interface: Exp

Returns the type of this expression. Never null.

Specified by:

getType in interface Exp

unparse

public void unparse(PrintWriter pw)

Description copied from interface: Exp

Writes the MDX representation of this expression to a print writer. Sub-expressions are invoked recursively.

Specified by:

unparse in interface Exp

Parameters:

pw - PrintWriter

accept

public Exp accept(Validator validator)

Description copied from interface: Exp

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'.

Specified by:

accept in interface Exp

Parameters:

validator - Validator contains validation context

Returns:

The validated expression; often but not always the same as this expression

accept

public Calc accept(ExpCompiler compiler)

Description copied from interface: Exp

Converts this expression into an a tree of expressions which can be efficiently evaluated.

Specified by:

accept in interface Exp

Returns:

A compiled expression

accept

public Object accept(MdxVisitor visitor)

Description copied from interface: Exp

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.

Specified by:

accept in interface Exp

Parameters:

visitor - Visitor