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/*
* Modification History
*
* 2001-February-10 Jason Rohrer
* Created.
*
* 2001-September-4 Jason Rohrer
* Changed the destructor to virtual to fix a memory leak.
*
* 2001-September-9 Jason Rohrer
* Changed setArgument to be more intelligent about duplicated calls.
* Added an extractArgument() implemenation.
*/
#ifndef BINARY_OPERATION_EXPRESSION_INCLUDED
#define BINARY_OPERATION_EXPRESSION_INCLUDED
#include "Expression.h"
/**
* Abstract base for an binary operation expression object.
*
* @author Jason Rohrer
*/
class BinaryOperationExpression : public Expression {
public:
/**
* Constructs a binary operation expression.
*
* Both arguments are destroyed when the class is destroyed.
*
* @param inArgumentA the first argument. Defaults to NULL.
* @param inArgumentA the first argument. Defaults to NULL.
*/
BinaryOperationExpression( Expression *inArgumentA = NULL,
Expression *inArgumentB = NULL );
virtual ~BinaryOperationExpression();
/**
* Sets the first argument for the operation.
*
* @param inArgument the first argument. Is destroyed
* when the class is destroyed, or by another
* call to setArgumentA.
*/
void setArgumentA( Expression *inArgument );
/**
* Sets the second argument for the operation.
*
* @param inArgument the second argument. Is destroyed
* when the class is destroyed, or by another
* call to setArgumentB.
*/
void setArgumentB( Expression *inArgument );
/**
* Gets the first argument for the operation.
*
* @return the first argument. Is destroyed
* when the class is destroyed, or by another
* call to setArgumentB. Returns NULL if the
* argument was never set.
*/
Expression *getArgumentA();
/**
* Gets the second argument for the operation.
*
* @return the second argument. Is destroyed
* when the class is destroyed, or by another
* call to setArgumentB. Returns NULL if the
* argument was never set.
*/
Expression *getArgumentB();
// implements the Expression interface
virtual long getNumArguments();
virtual Expression *getArgument( long inArgumentNumber );
virtual void setArgument( long inArgumentNumber,
Expression *inArgument );
virtual Expression *extractArgument( long inArgumentNumber );
protected:
Expression *mArgumentA;
Expression *mArgumentB;
};
inline BinaryOperationExpression::BinaryOperationExpression(
Expression *inArgumentA, Expression *inArgumentB )
: mArgumentA( inArgumentA ), mArgumentB( inArgumentB ) {
}
inline BinaryOperationExpression::~BinaryOperationExpression() {
if( mArgumentA != NULL ) {
delete mArgumentA;
}
if( mArgumentB != NULL ) {
delete mArgumentB;
}
}
inline void BinaryOperationExpression::setArgumentA( Expression *inArgument ) {
if( mArgumentA != NULL && inArgument != mArgumentA ) {
delete mArgumentA;
}
mArgumentA = inArgument;
}
inline void BinaryOperationExpression::setArgumentB( Expression *inArgument ) {
if( mArgumentB != NULL && inArgument != mArgumentB ) {
delete mArgumentB;
}
mArgumentB = inArgument;
}
inline Expression *BinaryOperationExpression::getArgumentA() {
return mArgumentA;
}
inline Expression *BinaryOperationExpression::getArgumentB() {
return mArgumentB;
}
inline long BinaryOperationExpression::getNumArguments() {
return 2;
}
inline Expression *BinaryOperationExpression::getArgument(
long inArgumentNumber ) {
switch( inArgumentNumber ) {
case 0:
return getArgumentA();
break;
case 1:
return getArgumentB();
break;
default:
return NULL;
break;
}
}
inline void BinaryOperationExpression::setArgument( long inArgumentNumber,
Expression *inArgument ) {
switch( inArgumentNumber ) {
case 0:
setArgumentA( inArgument );
return;
break;
case 1:
setArgumentB( inArgument );
return;
break;
default:
return;
break;
}
}
inline Expression *BinaryOperationExpression::extractArgument(
long inArgumentNumber ) {
Expression *returnArg;
switch( inArgumentNumber ) {
case 0:
returnArg = mArgumentA;
mArgumentA = NULL;
return returnArg;
break;
case 1:
returnArg = mArgumentB;
mArgumentB = NULL;
return returnArg;
break;
default:
return NULL;
break;
}
}
#endif
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