org.vishia.util

Class CalculatorExpr.Operator

java.lang.Object

org.vishia.util.CalculatorExpr.Operator

Enclosing class:

CalculatorExpr

public abstract static class CalculatorExpr.Operator
extends java.lang.Object

An operator for the current value (accu), the given second value maybe the operand from the CalculatorExpr.Operation, or for some additional values in stack. The operation are such as a set operation (set the arg to accu), add, subtract, negate, boolean operators etc or standard maths routines. Instances of this class are defined in the CalculatorExpr.

Field Summary

Fields

Modifier and Type	Field and Description
protected java.lang.String	name

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Operator(java.lang.String name)

Method Summary

Modifier and Type	Method and Description
protected abstract boolean	isBoolCheck() Returns true if this is a bool check operation.
protected abstract boolean	isUnary() Returns true on an unary operation, false on a operation with both operands.
protected abstract void	operate(CalculatorExpr.Value accu, CalculatorExpr.Value arg) Operates and returns the result type.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

name

protected final java.lang.String name

Constructor Detail

Operator

protected Operator(java.lang.String name)

Method Detail

operate

protected abstract void operate(CalculatorExpr.Value accu,
                                CalculatorExpr.Value arg)
                         throws java.lang.Exception

Operates and returns the result type. This method is used only internally, it is private, only protected to show it in the documentation. Before invoking the operation, both arguments are converted in a proper format for the operation with the method ExpressionType#checkArgument(Value, Value) with respect to the current type of the expression starting with the CalculatorExpr#startExpr.

Parameters:

Type - The current type

accu - First operand, used cumulatively or the only one operand for unary operations.

arg - The second argument for binary operations.

Throws:

java.lang.Exception - If the operation is not admissible.

isUnary

protected abstract boolean isUnary()

Returns true on an unary operation, false on a operation with both operands.

isBoolCheck

protected abstract boolean isBoolCheck()

Returns true if this is a bool check operation.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object