程序包 cn.taketoday.expression

接口 OperatorOverloader

所有已知实现类:

StandardOperatorOverloader

public interface OperatorOverloader

By default the mathematical operators Operation support simple types like numbers. By providing an implementation of OperatorOverloader, a user of the expression language can support these operations on other types.

从以下版本开始:

4.0

作者:

Andy Clement, Harry Yang

字段概要

字段

修饰符和类型	字段	说明
static final StandardOperatorOverloader	STANDARD

方法概要

修饰符和类型	方法	说明
Object	operate(Operation operation, Object leftOperand, Object rightOperand)	Execute the specified operation on two operands, returning a result.
boolean	overridesOperation(Operation operation, Object leftOperand, Object rightOperand)	Return true if the operator overloader supports the specified operation between the two operands and so should be invoked to handle it.

字段详细资料

STANDARD

static final StandardOperatorOverloader STANDARD

方法详细资料

overridesOperation

boolean overridesOperation(Operation operation,
 @Nullable
 Object leftOperand,
 @Nullable
 Object rightOperand)
                    throws EvaluationException

Return true if the operator overloader supports the specified operation between the two operands and so should be invoked to handle it.

参数:

operation - the operation to be performed

leftOperand - the left operand

rightOperand - the right operand

返回:

true if the OperatorOverloader supports the specified operation between the two operands

抛出:

EvaluationException - if there is a problem performing the operation

operate

Object operate(Operation operation,
 @Nullable
 Object leftOperand,
 @Nullable
 Object rightOperand)
        throws EvaluationException

Execute the specified operation on two operands, returning a result. See Operation for supported operations.

参数:

operation - the operation to be performed

leftOperand - the left operand

rightOperand - the right operand

返回:

the result of performing the operation on the two operands

抛出:

EvaluationException - if there is a problem performing the operation