org.springframework.rules.constraint.property
Class ConditionalPropertyConstraint

java.lang.Object
  org.springframework.rules.constraint.property.AbstractPropertyConstraint
      org.springframework.rules.constraint.property.ConditionalPropertyConstraint

All Implemented Interfaces:

Constraint, PropertyConstraint, TypeResolvable

public class ConditionalPropertyConstraint
extends AbstractPropertyConstraint
implements TypeResolvable

Provides a way to trigger rules for propertyB when propertyA satisfies a certain condition:

        if (propertyA satisfies the conditional constraint)
        {
                check the rules for propertyB
        }
 

with an optional part:

  else
  {
      check the rules for propertyC
  }
 

More complex situations are possible by using compound constraints which leverages the previous to:

 if (constraint(propertyA, propertyB,...) == true)
 {
     checkConstraint(property1, property2,...);
 }
 \\ optional part
 else
 {
     checkConstraint(propertyX, propertyY,...);
 }
 

This class can be compared to the IfTrue class: it applies the same pattern but on different properties instead of on a property value.

Author:

jh

Constructor Summary

ConditionalPropertyConstraint(PropertyConstraint ifConstraint, PropertyConstraint thenConstraint)

ConditionalPropertyConstraint(PropertyConstraint ifConstraint, PropertyConstraint thenConstraint, PropertyConstraint elseConstraint)

ConditionalPropertyConstraint(PropertyConstraint ifConstraint, PropertyConstraint thenConstraint, PropertyConstraint elseConstraint, String type)
Create a constraint which simulates the if...then...else pattern applied on separate properties.

ConditionalPropertyConstraint(PropertyConstraint ifConstraint, PropertyConstraint thenConstraint, String type)
Create a constraint which simulates the if...then pattern applied on separate properties.

Method Summary

String	getType() Returns this object's logical type identifier.
boolean	isCompoundRule() Does this property constraint effect more than one property?
boolean	isDependentOn(String propertyName) Returns true if this property constraint is dependent on the provided propertyName for test evaluation; that is, it should be retested when propertyName changes.
void	setType(String type)
protected boolean	test(PropertyAccessStrategy domainObjectAccessStrategy)

Methods inherited from class org.springframework.rules.constraint.property.AbstractPropertyConstraint

getPropertyName, setPropertyName, test, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

ConditionalPropertyConstraint

public ConditionalPropertyConstraint(PropertyConstraint ifConstraint,
                                     PropertyConstraint thenConstraint)

See Also:

ConditionalPropertyConstraint(PropertyConstraint, PropertyConstraint, String)

ConditionalPropertyConstraint

public ConditionalPropertyConstraint(PropertyConstraint ifConstraint,
                                     PropertyConstraint thenConstraint,
                                     String type)

Create a constraint which simulates the if...then pattern applied on separate properties.

Parameters:

ifConstraint - the PropertyConstraint that triggers the test (satisfying a certain condition).

thenConstraint - the PropertyConstraint to test in the specified condition.

ConditionalPropertyConstraint

public ConditionalPropertyConstraint(PropertyConstraint ifConstraint,
                                     PropertyConstraint thenConstraint,
                                     PropertyConstraint elseConstraint)

See Also:

ConditionalPropertyConstraint(PropertyConstraint, PropertyConstraint, PropertyConstraint, String)

ConditionalPropertyConstraint

public ConditionalPropertyConstraint(PropertyConstraint ifConstraint,
                                     PropertyConstraint thenConstraint,
                                     PropertyConstraint elseConstraint,
                                     String type)

Create a constraint which simulates the if...then...else pattern applied on separate properties.

Parameters:

ifConstraint - the PropertyConstraint that triggers the test (satisfying a certain condition).

thenConstraint - the PropertyConstraint to test in the specified condition.

elseConstraint - the PropertyConstraint to test if the condition is NOT satisfied. May be null.

type - the messageCode used to fetch the message.

Method Detail

isCompoundRule

public boolean isCompoundRule()

Description copied from interface: PropertyConstraint

Does this property constraint effect more than one property?

Specified by:

isCompoundRule in interface PropertyConstraint

Overrides:

isCompoundRule in class AbstractPropertyConstraint

Returns:

true if yes, false otherwise

isDependentOn

public boolean isDependentOn(String propertyName)

Description copied from interface: PropertyConstraint

Returns true if this property constraint is dependent on the provided propertyName for test evaluation; that is, it should be retested when propertyName changes.

Specified by:

isDependentOn in interface PropertyConstraint

Overrides:

isDependentOn in class AbstractPropertyConstraint

Returns:

true or false

test

protected boolean test(PropertyAccessStrategy domainObjectAccessStrategy)

Specified by:

test in class AbstractPropertyConstraint

getType

public String getType()

Description copied from interface: TypeResolvable

Returns this object's logical type identifier.

Specified by:

getType in interface TypeResolvable

Returns:

The type identifier

setType

public void setType(String type)