org.vishia.util

Class CalculatorExpr.Data

java.lang.Object

org.vishia.util.CalculatorExpr.Data

Enclosing class:

CalculatorExpr

public static class CalculatorExpr.Data
extends java.lang.Object

It is the data instance for the caluclation. Only the data instance have current data. One can use the CalculatorExpr itself in multithreading/multicore, but any thread should have its own data. The data instance can be reused in the same thread for the next operation. Invoke clean() before reusing.

Field Summary

Fields

Modifier and Type	Field and Description
protected CalculatorExpr.Value	accu The top of stack is the accumulator for the current level of adequate operations, for example all multiplications without stack changing.
protected java.util.Stack<CalculatorExpr.Value>	stack The stack of values used temporary.

Constructor Summary

Constructors

Constructor and Description
Data()

Method Summary

Modifier and Type	Method and Description
void	clean()

Methods inherited from class java.lang.Object

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

Field Detail

accu

protected CalculatorExpr.Value accu

The top of stack is the accumulator for the current level of adequate operations, for example all multiplications without stack changing. It is the left operand of an operation. The right operand is given in the operation itself. It an operation acts with the last 2 stack levels, the value of the top of stack (the accu) is set locally in the operation and the second value of the stack operands is set to the accu.

stack

protected final java.util.Stack<CalculatorExpr.Value> stack

The stack of values used temporary. It is only in used while any calculate routine runs. The top of all values is not stored in the stack but in the accu. It means that often the stack is not used.

Constructor Detail

Data

public Data()

Method Detail

clean

public void clean()