org.apache.commons.workflow.core
Class InvokeStep

java.lang.Object
  org.apache.commons.workflow.base.BaseStep
      org.apache.commons.workflow.base.DescriptorStep
          org.apache.commons.workflow.core.InvokeStep

All Implemented Interfaces:

Descriptors, Step

public class InvokeStep
extends DescriptorStep

Call the specified method of the specified bean in the specified scope, passing arguments as specified by associated Descriptor objects. The first associated Descriptor identifies the Java object on whom method invocation shall take place.

FIXME - Better way to deal with exceptions???

Supported Attributes:

• method - Name of the public method to be called on the bean specified by either name and scope, or by xpath.

Version:

$Revision: 155475 $ $Date: 2005-02-26 13:31:11 +0000 (Sat, 26 Feb 2005) $

Author:

Craig R. McClanahan

Field Summary

protected String

method The method name to be invoked.

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

InvokeStep()
Construct a default instance of this Step.

InvokeStep(String id)
Construct an instance of this Step with the specified identifier.

InvokeStep(String id, String method)
Construct a fully configured instance of this Step.

InvokeStep(String id, String method, Descriptor descriptor)
Construct a fully configured instance of this Step.

Method Summary

void	execute(Context context) Perform the executable actions related to this Step, in the context of the specified Context.
protected Method	findMethod(Object bean, String name, Class[] types) Return a Method of the specified Class with the specified method name, that takes the specified parameter types, if there is one.
String	getMethod()
void	setMethod(String method)
protected String	signature(String name, Class[] types) Return a method signature useful in debugging and exception messages.
String	toString() Render a string representation of this Step.

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

Field Detail

method

protected String method

The method name to be invoked.

Constructor Detail

InvokeStep

public InvokeStep()

Construct a default instance of this Step.

InvokeStep

public InvokeStep(String id)

Construct an instance of this Step with the specified identifier.

Parameters:

id - Step identifier

InvokeStep

public InvokeStep(String id,
                  String method)

Construct a fully configured instance of this Step.

Parameters:

id - Step identifier

method - Method name

InvokeStep

public InvokeStep(String id,
                  String method,
                  Descriptor descriptor)

Construct a fully configured instance of this Step.

Parameters:

id - Step identifier

method - Method name

descriptor - Descriptor for the bean on which to invoke

Method Detail

getMethod

public String getMethod()

setMethod

public void setMethod(String method)

execute

public void execute(Context context)
             throws StepException

Perform the executable actions related to this Step, in the context of the specified Context.

Specified by:

execute in interface Step

Specified by:

execute in class BaseStep

Parameters:

context - The Context that is tracking our execution state

Throws:

StepException - if a processing error has occurred

toString

public String toString()

Render a string representation of this Step.

Overrides:

toString in class Object

findMethod

protected Method findMethod(Object bean,
                            String name,
                            Class[] types)

Return a Method of the specified Class with the specified method name, that takes the specified parameter types, if there is one. Otherwise, return null.

Parameters:

bean - Bean on which method searching is to be done

name - Method name to search for

types - Parameter types to search for

signature

protected String signature(String name,
                           Class[] types)

Return a method signature useful in debugging and exception messages.

Parameters:

name - Method name

types - Parameter types