Package ru.ewc.decita

Class DecisionTable

java.lang.Object

ru.ewc.decita.DecisionTable

All Implemented Interfaces:

Locator

public final class DecisionTable
extends Object
implements Locator

I am a collection of Rules used to compute any kind of decision. My main responsibility is to orchestrate the computation and choose the only satisfied Rule.

Since:

0.1

Field Summary

Fields inherited from interface ru.ewc.decita.Locator

CONSTANT_VALUES

Constructor Summary

Constructors

Constructor	Description
DecisionTable(Iterable<Rule> rules)	Ctor.
DecisionTable(Iterable<Rule> rules, Rule elserule)	Ctor.

Method Summary

Modifier and Type	Method	Description
String	fragmentBy(String fragment, ComputationContext context)	Determines the system's state - the value of a single property, described by its name.
Map<String,String>	outcome(ComputationContext context)	Computes this table's outcomes by checking all of its Rules.

Methods inherited from class java.lang.Object

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

Constructor Details

DecisionTable

public DecisionTable(Iterable<Rule> rules)

Ctor.

Parameters:

rules - A collection of Rules for this table.

DecisionTable

public DecisionTable(Iterable<Rule> rules,
 Rule elserule)

Ctor.

Parameters:

rules - A collection of Rules for this table.

elserule - The special Rule that gets satisfied only if no other Rule is satisfied.

Method Details

fragmentBy

public String fragmentBy(String fragment,
 ComputationContext context)
                  throws DecitaException

Description copied from interface: Locator

Determines the system's state - the value of a single property, described by its name.

Specified by:

fragmentBy in interface Locator

Parameters:

fragment - The String identifier of the required property.

context - The ComputationContext to use in property retrieval.

Returns:

The value of the requested property as a String.

Throws:

DecitaException - When the requested Coordinate cannot be found.

outcome

public Map<String,String> outcome(ComputationContext context)
                           throws DecitaException

Description copied from interface: Locator

Computes this table's outcomes by checking all of its Rules.

Specified by:

outcome in interface Locator

Parameters:

context - The specific ComputationContext to make a decision in.

Returns:

The simple dictionary of the table's outcomes.

Throws:

DecitaException - If any of the Rules cannot be checked.