org.apache.commons.workflow.core
Class WhileNotStep

java.lang.Object
  org.apache.commons.workflow.base.BaseStep
      org.apache.commons.workflow.base.DescriptorStep
          org.apache.commons.workflow.base.BaseBlock
              org.apache.commons.workflow.core.WhileStep
                  org.apache.commons.workflow.core.WhileNotStep

All Implemented Interfaces:

org.apache.commons.workflow.Block, org.apache.commons.workflow.Descriptors, org.apache.commons.workflow.Iterator, org.apache.commons.workflow.Owner, org.apache.commons.workflow.Step

public class WhileNotStep

extends WhileStep

Repeatedly evaluate the properties specified by the associated Descriptors, and execute the nested Steps if and only if ANY of them evaluate to a negative result. To avoid non-deterministic evaluation stack behavior, all of the specified Descriptors are always evaluated exactly once.

Version:

$Revision: 1.3 $ $Date: 2004/02/28 03:35:54 $

Field Summary

Fields inherited from class org.apache.commons.workflow.base.BaseBlock

firstStep, lastStep

Fields inherited from class org.apache.commons.workflow.base.DescriptorStep

descriptors

Fields inherited from class org.apache.commons.workflow.base.BaseStep

id, nextStep, owner, previousStep

Constructor Summary

WhileNotStep()
Construct a default instance of this Step.

WhileNotStep(java.lang.String id)
Construct an instance of this Step with the specified identifier.

WhileNotStep(java.lang.String id, org.apache.commons.workflow.Descriptor descriptor)
Construct a fully configured instance of this Step.

Method Summary

protected boolean	evaluate(org.apache.commons.workflow.Context context) Evaluate the condition specified by the Descriptors associated with this Block, and return the resulting boolean value.
java.lang.String	toString() Render a string representation of this Step.

Methods inherited from class org.apache.commons.workflow.core.WhileStep

initial, subsequent

Methods inherited from class org.apache.commons.workflow.base.BaseBlock

addStep, clearSteps, execute, findStep, getFirstStep, getLastStep, getSteps, setSteps, state

Methods inherited from class org.apache.commons.workflow.base.DescriptorStep

addDescriptor, findDescriptors, removeDescriptor

Methods inherited from class org.apache.commons.workflow.base.BaseStep

getId, getNextStep, getOwner, getPreviousStep, setId, setNextStep, setOwner, setPreviousStep

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.commons.workflow.Owner

addStep, clearSteps, findStep, getFirstStep, getLastStep, getSteps, setSteps

Methods inherited from interface org.apache.commons.workflow.Step

execute, getId, getNextStep, getOwner, getPreviousStep, setId, setNextStep, setOwner, setPreviousStep

Constructor Detail

WhileNotStep

public WhileNotStep()

Construct a default instance of this Step.

WhileNotStep

public WhileNotStep(java.lang.String id)

Construct an instance of this Step with the specified identifier.

Parameters:

id - Step identifier

WhileNotStep

public WhileNotStep(java.lang.String id,
                    org.apache.commons.workflow.Descriptor descriptor)

Construct a fully configured instance of this Step.

Parameters:

id - Step identifier of this step

descriptor - Initial descriptor to be added

Method Detail

toString

public java.lang.String toString()

Render a string representation of this Step.

Overrides:

toString in class WhileStep

evaluate

protected boolean evaluate(org.apache.commons.workflow.Context context)

Evaluate the condition specified by the Descriptors associated with this Block, and return the resulting boolean value.

Overrides:

evaluate in class WhileStep

Parameters:

context - Context within which to evaluate the descriptors