Package org.datanucleus.query.expression

Class Expression.DyadicOperator

java.lang.Object

org.datanucleus.query.expression.Expression.Operator

org.datanucleus.query.expression.Expression.DyadicOperator

All Implemented Interfaces:

Serializable

Enclosing class:

Expression

public static class Expression.DyadicOperator
extends Expression.Operator

"Dyadic" operator performs operation on one or two operands.

See Also:

Serialized Form

Field Summary

Fields inherited from class org.datanucleus.query.expression.Expression.Operator

precedence, symbol

Constructor Summary

Constructors

Constructor	Description
DyadicOperator(String symbol, int precedence, boolean isAssociative)	Dyadic operator

Method Summary

Modifier and Type	Method	Description
boolean	isHigherThanLeftSide(Expression.Operator op)	Checks if this operation is higher than operator op in left side of the expression
boolean	isHigherThanRightSide(Expression.Operator op)	Checks if this operation is higher than operator op in right side of the expression

Methods inherited from class org.datanucleus.query.expression.Expression.Operator

toString

Methods inherited from class java.lang.Object

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

Constructor Detail

DyadicOperator

public DyadicOperator(String symbol,
                      int precedence,
                      boolean isAssociative)

Dyadic operator

Parameters:

symbol - the source text or symbol of an operator. e.g =, ==, +, /, >, <, etc

precedence - the order of precedence where the expression is compiled

isAssociative - true if associative operator. An associative operator is one for which parentheses can be inserted and removed without changing the meaning of the expression

Method Detail

isHigherThanLeftSide

public boolean isHigherThanLeftSide(Expression.Operator op)

Checks if this operation is higher than operator op in left side of the expression

Parameters:

op - the operator in the left side of the expression

Returns:

true if this operation is higher than operator op in left side of the expression

isHigherThanRightSide

public boolean isHigherThanRightSide(Expression.Operator op)

Checks if this operation is higher than operator op in right side of the expression

Parameters:

op - the operator in the right side of the expression

Returns:

true if this operation is higher than operator op in right side of the expression