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OpenAI FSM is used by Apache cTAKES.
It was originally developed out of sourceforge openAI group
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/*****************************************************************************
* net.openai.fsm.NullCondition
*****************************************************************************
* @author thornhalo
* @date Fri Oct 11 23:20:42 EDT 2002
* 2002 OpenAI Labs
*****************************************************************************/
package net.openai.util.fsm;
/**
* This condition will be satisfied whenever a null is passed in as an input
* to the machine.
*/
public final class NullCondition extends AbstractCondition {
/**
* Constructs a new NullCondition.
*/
public NullCondition() {
this(null);
}
/**
* Constructs a new NullCondition for the given target state.
*
* @param targetState The target state for the condition.
*/
public NullCondition(State targetState) {
super(targetState);
}
/**
* Called to check if the conditional meets the criteria defined by this
* condition. In this case, any condition that is null will pass.
*
* @param conditional The object to check.
* @return True if conditional is null.
*/
public final boolean satisfiedBy(Object conditional) {
return (conditional == null);
}
}