de.scravy.machina

Class ExpressionGuard<E,C>

java.lang.Object

de.scravy.machina.ExpressionGuard<E,C>

Type Parameters:

C - Context

All Implemented Interfaces:

Guard<E,C>, Serializable

public final class ExpressionGuard<E,C>
extends Object
implements Guard<E,C>, Serializable

A Guard which is defined by an MVEL expression.

Since:

1.0.0

Author:

Julian Fleischer

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ExpressionGuard(String expression) Create a condition with an MVEL expression as guard.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
boolean	evaluate(E event, C context) Determines whether the guarded transition is eligible or not.
Serializable	getCompiledExpression()
String	getExpression()
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

ExpressionGuard

public ExpressionGuard(String expression)
                throws InvalidExpressionException,
                       IllegalArgumentException

Create a condition with an MVEL expression as guard.

Parameters:

expression - The expression. You can use the variables e, event, c, and context to refer to the event of type E and the context of type C.

Throws:

InvalidExpressionException - If the expression failed to compile.

IllegalArgumentException - If the given expression is null.

Since:

1.0.0

Method Detail

evaluate

public boolean evaluate(E event,
                        C context)

Description copied from interface: Guard

Determines whether the guarded transition is eligible or not.

Specified by:

evaluate in interface Guard<E,C>

Parameters:

event - The event that was fired.

context - The context of the state machine.

Returns:

Whether the guarded transition is eligible or not.

toString

public String toString()

Overrides:

toString in class Object

getExpression

@NonNull
 @Generated(value="lombok")
public String getExpression()

getCompiledExpression

@NonNull
 @Generated(value="lombok")
public Serializable getCompiledExpression()

equals

@Generated(value="lombok")
public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

@Generated(value="lombok")
public int hashCode()

Overrides:

hashCode in class Object