Package ru.ewc.decita

Class Coordinate

java.lang.Object

ru.ewc.decita.Coordinate

All Implemented Interfaces:

Comparable<Coordinate>

public final class Coordinate
extends Object
implements Comparable<Coordinate>

I am a simple data structure describing the position of the required value. My responsibility is to provide everything that is needed to retrieve that value. The position of every value is described by the Locator's ID and the String value's ID, so it looks like a 2D-coordinate.

Since:

0.1

Field Summary

Fields

Modifier and Type	Field	Description
static final String	NUMBER_REGEXP	A regular expression for a number.
static final Coordinate	TRUE	A constant value Coordinate that points to the "true" value.

Constructor Summary

Constructors

Constructor	Description
Coordinate(String locator, String fragment)	Ctor.

Method Summary

Modifier and Type	Method	Description
int	compareTo(Coordinate other)
boolean	isComputed()	Tests if Coordinate is already computed, i.e.
Coordinate	locateIn(ComputationContext context)	Locates the required value in the provided ComputationContext.

Methods inherited from class java.lang.Object

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

Field Details

TRUE

public static final Coordinate TRUE

A constant value Coordinate that points to the "true" value.

NUMBER_REGEXP

public static final String NUMBER_REGEXP

A regular expression for a number.

See Also:

• Constant Field Values

Constructor Details

Coordinate

public Coordinate(String locator,
 String fragment)

Ctor.

Parameters:

locator - The Locator identifier.

fragment - The value's identifier.

Method Details

locateIn

public Coordinate locateIn(ComputationContext context)
                    throws DecitaException

Locates the required value in the provided ComputationContext. Always return the same object with updated fields (not a new instance) because there could be many references to this instance, i.e. the same Coordinate could be used in many Conditions.

Parameters:

context - Provided ComputationContext.

Returns:

A constant value Coordinate.

Throws:

DecitaException - If the specified Locator is missing.

isComputed

public boolean isComputed()

Tests if Coordinate is already computed, i.e. its value is constant.

Returns:

True, if Coordinate points to a constant value.

compareTo

public int compareTo(Coordinate other)

Specified by:

compareTo in interface Comparable<Coordinate>