Package org.springframework.expression

Interface OperatorOverloader

All Known Implementing Classes:
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.
Since:
3.0
Author:
Andy Clement

  • Method Summary

    Modifier and Type
    Method
    Description
    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.

  • Method Details

    • 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.
      Parameters:
      operation - the operation to be performed
      leftOperand - the left operand
      rightOperand - the right operand
      Returns:
      true if the OperatorOverloader supports the specified operation between the two operands
      Throws:
      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.
      Parameters:
      operation - the operation to be performed
      leftOperand - the left operand
      rightOperand - the right operand
      Returns:
      the result of performing the operation on the two operands
      Throws:
      EvaluationException - if there is a problem performing the operation