Class Expression.DyadicOperator

java.lang.Object

org.datanucleus.store.query.expression.Expression.Operator

org.datanucleus.store.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

Modifier and Type	Field	Description
private final boolean	isAssociative	An associative operator is one for which parentheses can be inserted and removed without changing the meaning of the expression
private static final long	serialVersionUID

Fields inherited from class 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 Expression.Operator

toString

Methods inherited from class Object

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

Field Details

serialVersionUID

private static final long serialVersionUID

See Also:

• Constant Field Values

isAssociative

private final boolean isAssociative

An associative operator is one for which parentheses can be inserted and removed without changing the meaning of the expression

Constructor Details

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 Details

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