org.mov.parser.expression
Class ArithmeticExpression

java.lang.Object
  org.mov.parser.expression.AbstractExpression
      org.mov.parser.expression.BinaryExpression
          org.mov.parser.expression.ArithmeticExpression

All Implemented Interfaces:

java.lang.Cloneable, Expression

Direct Known Subclasses:

AddExpression, DivideExpression, MultiplyExpression, SubtractExpression

public abstract class ArithmeticExpression
extends BinaryExpression

Abstract base class for the arithmetic expressions: +, /, *, -

Field Summary

Fields inherited from interface org.mov.parser.Expression

BOOLEAN_TYPE, FALSE, FLOAT_QUOTE_TYPE, FLOAT_TYPE, INTEGER_QUOTE_TYPE, INTEGER_TYPE, STRING_TYPE, TRUE, TRUE_LEVEL

Constructor Summary

ArithmeticExpression(Expression left, Expression right)
Create a new arithmetic expression with the given left and right arguments.

Method Summary

int	checkType() Check the input arguments to the expression.
int	getType() Get the type of the expression.
Expression	simplify() Perform simplifications and optimisations on the expression tree.

Methods inherited from class org.mov.parser.expression.BinaryExpression

getChildCount, toString

Methods inherited from class org.mov.parser.expression.AbstractExpression

clone, equals, getChild, getIndex, getNumberFormat, getParent, hashCode, isRoot, iterator, parseDouble, parseInt, setChild, setParent, size, size, valueOfDouble, valueOfInt

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.mov.parser.Expression

evaluate, toString

Constructor Detail

ArithmeticExpression

public ArithmeticExpression(Expression left,
                            Expression right)

Create a new arithmetic expression with the given left and right arguments.

Method Detail

checkType

public int checkType()
              throws TypeMismatchException

Check the input arguments to the expression. They can only be Expression.INTEGER_TYPE or Expression.FLOAT_TYPE. There are 4 possible cases: Expression.INTEGER_TYPE operator Expression.INTEGER_TYPE returns a Expression.INTEGER_TYPE Expression.INTEGER_TYPE operator Expression.FLOAT_TYPE returns a Expression.INTEGER_TYPE Expression.FLOAT_TYPE operator Expression.INTEGER_TYPE returns a Expression.FLOAT_TYPE Expression.FLOAT_TYPE operator Expression.FLOAT_TYPE returns a Expression.FLOAT_TYPE

Returns:

the type of the expression

Throws:

TypeMismatchException - if the expression has incorrect types

simplify

public Expression simplify()

Description copied from class: AbstractExpression

Perform simplifications and optimisations on the expression tree. For example, if the expression tree was a and true then the expression tree would be simplified to a.

Specified by:

simplify in interface Expression

Overrides:

simplify in class AbstractExpression

getType

public int getType()

Get the type of the expression.

Returns:

either Expression.FLOAT_TYPE or Expression.INTEGER_TYPE.