Class Expression.Operator

java.lang.Object

org.apache.felix.gogo.runtime.Expression.Operator

Direct Known Subclasses:

Expression.Assignment, Expression.Comparator

Enclosing class:

Expression

public abstract class Expression.Operator
extends Object

Abstract definition of a supported operator. An operator is defined by its name (pattern), precedence and if it is left- or right associative.

Author:

Udo Klimaschewski (http://about.me/udo.klimaschewski)

Constructor Summary

Constructors

Constructor	Description
Operator(String oper, int precedence, boolean leftAssoc)	Creates a new operator.

Method Summary

Modifier and Type	Method	Description
Object	eval(String v1, String v2)
abstract BigDecimal	eval(BigDecimal v1, BigDecimal v2)	Implementation for this operator.
Object	eval(Map<String,Object> variables, Object v1, Object v2)
String	getOper()
int	getPrecedence()
boolean	isLeftAssoc()
String	toString()

Methods inherited from class Object

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

Constructor Details

Operator

public Operator(String oper,
 int precedence,
 boolean leftAssoc)

Creates a new operator.

Parameters:

oper - The operator name (pattern).

precedence - The operators precedence.

leftAssoc - true if the operator is left associative, else false.

Method Details

getOper

public String getOper()

getPrecedence

public int getPrecedence()

isLeftAssoc

public boolean isLeftAssoc()

eval

public Object eval(Map<String,Object> variables,
 Object v1,
 Object v2)

eval

public Object eval(String v1,
 String v2)

eval

public abstract BigDecimal eval(BigDecimal v1,
 BigDecimal v2)

Implementation for this operator.

Parameters:

v1 - Operand 1.

v2 - Operand 2.

Returns:

The result of the operation.

toString

public String toString()

Overrides:

toString in class Object