cetus.hir
Class MinMaxExpression

java.lang.Object
  cetus.hir.Expression
      cetus.hir.MinMaxExpression

All Implemented Interfaces:

Printable, Traversable, java.lang.Cloneable, java.lang.Comparable<Expression>

public class MinMaxExpression
extends Expression

Class for MIN() MAX() expressions - these are equivalent to conditional expressions.

Field Summary

Fields inherited from class cetus.hir.Expression

children, needs_parens, object_print_method, parent

Constructor Summary

MinMaxExpression(boolean ismin)
Constructor with predefined min/max operator.

MinMaxExpression(boolean ismin, Expression lhs, Expression rhs)
Constructor with two operands.

Method Summary

void	add(Expression e) Adds an operand to the existing expression.
int	compareTo(Expression e) Compares MinMaxExpression to another expression.
java.lang.Integer	compareTo(int num) Compares MinMaxExpression to an integer value.
static void	defaultPrint(MinMaxExpression minmax, java.io.OutputStream stream) Prints out MIN/MAX expressions.
boolean	isMin() Returns true if this is a MIN expression.
boolean	isNegMin() Checks if this expression is a MIN expression having at least one operand with negative value.
boolean	isPosMax() Checks if this expression is a MIN expression having at least one operand with positive value.
Expression	negate() Negates the expression by switching the operator and the signs of the operands.
void	setMin(boolean ismin) Sets the expression type.
Expression	simplify() Simplifies a MinMaxExpression as much as possible by removing duplicates and by matching special cases.
Expression	toConditionalExpression() Converts MinMaxExpression to an equivalent conditional expression.
java.lang.String	toString() Every expression class should override toString method.

Methods inherited from class cetus.hir.Expression

clone, equals, equals2, findExpression, getChildren, getParent, getStatement, needsParens, print, printSelf, removeChild, setChild, setParens, setParent, setPrintMethod, swapWith, verify

Methods inherited from class java.lang.Object

finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

MinMaxExpression

public MinMaxExpression(boolean ismin)

Constructor with predefined min/max operator.

Parameters:

ismin - true if the operator is MIN, false otherwise

MinMaxExpression

public MinMaxExpression(boolean ismin,
                        Expression lhs,
                        Expression rhs)

Constructor with two operands.

Parameters:

ismin - true if the operator is MIN, false otherwise

lhs - the first operand

rhs - the second operand

Method Detail

defaultPrint

public static void defaultPrint(MinMaxExpression minmax,
                                java.io.OutputStream stream)

Prints out MIN/MAX expressions.

toString

public java.lang.String toString()

Description copied from class: Expression

Every expression class should override toString method.

Overrides:

toString in class Expression

isMin

public boolean isMin()

Returns true if this is a MIN expression.

Returns:

true if this is a MIN expression, false otherwise

setMin

public void setMin(boolean ismin)

Sets the expression type.

Parameters:

ismin - true for MIN, false for MAX

add

public void add(Expression e)

Adds an operand to the existing expression.

Parameters:

e - the new operand to be appended

negate

public Expression negate()

Negates the expression by switching the operator and the signs of the operands.

Returns:

the negated expression

isPosMax

public boolean isPosMax()

Checks if this expression is a MIN expression having at least one operand with positive value.

Returns:

true/false

isNegMin

public boolean isNegMin()

Checks if this expression is a MIN expression having at least one operand with negative value.

Returns:

true/false

simplify

public Expression simplify()

Simplifies a MinMaxExpression as much as possible by removing duplicates and by matching special cases.

Returns:

A simplified expression

compareTo

public int compareTo(Expression e)

Compares MinMaxExpression to another expression.

Specified by:

compareTo in interface java.lang.Comparable<Expression>

Overrides:

compareTo in class Expression

compareTo

public java.lang.Integer compareTo(int num)

Compares MinMaxExpression to an integer value.

Parameters:

num - an integer value

Returns:

Integer object if comparison is possible, null otherwise

toConditionalExpression

public Expression toConditionalExpression()

Converts MinMaxExpression to an equivalent conditional expression.

Returns:

the converted conditional expression