jeb.api.ast

Class Predicate

java.lang.Object

jeb.api.ast.NonStatement

jeb.api.ast.Expression

jeb.api.ast.Predicate

All Implemented Interfaces:

IElement, IExpression

public class Predicate
extends Expression

This AST element is used to represent predicates. A predicate is a boolean Expression. It evaluates to true or false.

Note: Currently, logical expressions using non short-circuiting operators OR (|), AND (&), or XOR(^) are not allowed.

Since:

1.4.201309040

See Also:

Operator, IfStm, WhileStm, DoWhileStm, ForStm

Method Summary

Modifier and Type	Method and Description
static Predicate	build(IExpression left, Operator operator, IExpression right) Create a new predicate expression.
boolean	isLitteralFalse() Determine if the predicate represents the simple literal value 'false' (null IDENT 'false').
boolean	isLitteralTrue() Determine if the predicate represents the simple literal value 'true' (null IDENT 'true').
void	reverse() Reverse the predicate.

Methods inherited from class jeb.api.ast.Expression

getLeft, getOperator, getRight

Methods inherited from class jeb.api.ast.NonStatement

attachTag, getSubElements, replaceSubElement, retrieveTag

Methods inherited from class java.lang.Object

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

Methods inherited from interface jeb.api.ast.IElement

attachTag, getSubElements, replaceSubElement, retrieveTag

Method Detail

build

public static Predicate build(IExpression left,
                              Operator operator,
                              IExpression right)

Create a new predicate expression.

Parameters:

left - optional left expression, should be null if the operator is a unary operator

operator - a logical operator. Currently, only one of the following 11 logical operators is allowed: LOG_IDENT, LOG_NOT, LOG_OR, LOG_AND, INSTANCEOF, EQ, NE, LT, GE, GT, LE.

right - mandatory right expression

Returns:

the new predicate

Since:

1.4.201309040

isLitteralTrue

public boolean isLitteralTrue()

Determine if the predicate represents the simple literal value 'true' (null IDENT 'true').

Returns:

true if the predicate represents the literal true

Since:

1.4.201309040

isLitteralFalse

public boolean isLitteralFalse()

Determine if the predicate represents the simple literal value 'false' (null IDENT 'false').

Returns:

true if the predicate represents the literal false

Since:

1.4.201309040

reverse

public void reverse()

Reverse the predicate.

Since:

1.4.201309040