a2u.tn.utils.computer.calculator

Class Calculator

java.lang.Object

a2u.tn.utils.computer.calculator.Calculator

Direct Known Subclasses:

MapListEngine

public abstract class Calculator
extends Object

Computing by formula

Constructor Summary

Constructors

Constructor and Description
Calculator()

Method Summary

Modifier and Type	Method and Description
void	addFunction(Function function) Add or replace function for used in query
void	addType(Type descriptor) Add or replace type for used in data
Object	calc(Formula formula, Object startObj) Run computing using the prepared formula
Object	calc(String query, Object startObj) Run computing using query as string
Object	calcArgument(FormulaPart part, Object value, int rowIndex, Collection<Object> allRows) Compute result for part of formula
boolean	equalValues(Object v1, Object v2) Compare values.
protected abstract Collection<Object>	extractValues(String byCode, Collection<Object> fromObjList) Extract values from each object 'fromObjList' by code
Function	getFunction(String name) Getter for known functions
Type	getType(Class<?> forClass) Getter for known types
<T> T	toType(Class<?> toCls, Object value) Convert value to type

Methods inherited from class java.lang.Object

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

Constructor Detail

Calculator

public Calculator()

Method Detail

calc

public Object calc(Formula formula,
                   Object startObj)

Run computing using the prepared formula

Parameters:

formula - prepared formula

startObj - object for begin computing

Returns:

result of calculations

calc

public Object calc(String query,
                   Object startObj)

Run computing using query as string

Parameters:

query - query as string

startObj - object for begin computing

Returns:

result of calculations

calcArgument

public Object calcArgument(FormulaPart part,
                           Object value,
                           int rowIndex,
                           Collection<Object> allRows)

Compute result for part of formula

Parameters:

part - part of formula

value - value for computing

rowIndex - index in collection with all values

allRows - collection with all values

Returns:

result of calculations

extractValues

protected abstract Collection<Object> extractValues(String byCode,
                                                    Collection<Object> fromObjList)

Extract values from each object 'fromObjList' by code

Parameters:

byCode - code for extracting values

fromObjList - collection with objects for extracting values

Returns:

Values

addFunction

public void addFunction(Function function)

Add or replace function for used in query

Parameters:

function - new function

getFunction

public Function getFunction(String name)

Getter for known functions

Parameters:

name - name of function

Returns:

function

addType

public void addType(Type descriptor)

Add or replace type for used in data

Parameters:

descriptor - type descriptor

getType

public Type getType(Class<?> forClass)

Getter for known types

Parameters:

forClass - class

Returns:

type descriptor

toType

public <T> T toType(Class<?> toCls,
                    Object value)

Convert value to type

Parameters:

toCls - goal-class for result

value - value which be converted

Returns:

value with goal type

equalValues

public boolean equalValues(Object v1,
                           Object v2)

Compare values. Values can be of different types. The second value will be converted to the first value type.

Parameters:

v1 - the first value

v2 - the second value

Returns:

comparison result