Package org.apache.wiki.workflow

Class AbstractStep

java.lang.Object
org.apache.wiki.workflow.AbstractStep
All Implemented Interfaces:
Serializable, Step
Direct Known Subclasses:
Decision, Task
public abstract class AbstractStep
extends Object
implements Step
Abstract superclass that provides a complete implementation of most Step methods; subclasses need only implement execute() and getActor().
Since:
2.5
See Also:
Serialized Form

  • Constructor Details

    • AbstractStep

      protected AbstractStep​(String messageKey)
      Protected constructor that creates a new Step with a specified message key. After construction, the method setWorkflow(int, Map) should be called.
      Parameters:
      messageKey - the Step's message key, such as decision.editPageApproval. By convention, the message prefix should be a lower-case version of the Step's type, plus a period (e.g., task. and decision.).

    • AbstractStep

      public AbstractStep​(int workflowId, Map<String,​Serializable> workflowContext, String messageKey)
      Constructs a new Step belonging to a specified Workflow and having a specified message key.
      Parameters:
      workflowId - the parent workflow id to set
      workflowContext - the parent workflow context to set
      messageKey - the Step's message key, such as decision.editPageApproval. By convention, the message prefix should be a lower-case version of the Step's type, plus a period (e.g., task. and decision.).

  • Method Details

    • addSuccessor

      public final void addSuccessor​(Outcome outcome, Step step)
      Adds a successor Step to this one, which will be triggered by a supplied Outcome. Implementations should respect the order in which Outcomes are added; Step.getAvailableOutcomes() should return them in the same order they were added.
      Specified by:
      addSuccessor in interface Step
      Parameters:
      outcome - the Outcome triggering a particular successor Step
      step - the Step to associated with this Outcomes (null denotes no Steps)

    • getAvailableOutcomes

      public final Collection<Outcome> getAvailableOutcomes()
      Returns a Collection of available outcomes, such as "approve", "deny" or "reassign", in the order in which they were added via Step.addSuccessor(Outcome, Step). Concrete implementations should always return a defensive copy of the outcomes, not the original backing collection.
      Specified by:
      getAvailableOutcomes in interface Step
      Returns:
      the set of outcomes

    • getErrors

      public final List<String> getErrors()
      Returns a List of error strings generated by this Step. If this Step generated no errors, this method returns a zero-length array.
      Specified by:
      getErrors in interface Step
      Returns:
      the errors

    • execute

      public abstract Outcome execute() throws WikiException

      Executes the processing for this Step and returns an Outcome indicating if it succeeded (Outcome.STEP_COMPLETE or Outcome.STEP_ABORT). Processing instructions can do just about anything, such as executing custom business logic or changing the Step's final outcome via Step.setOutcome(Outcome). A return value of STEP_COMPLETE indicates that the instructions executed completely, without errors; STEP_ABORT indicates that the Step and its parent Workflow should be aborted (that is, fail silently without error). If the execution step encounters any errors, it should throw a WikiException or a subclass.

      Note that successful execution of this methods does not necessarily mean that the Step is considered "complete"; rather, it just means that it has executed. Therefore, it is possible that execute could run multiple times.

      Specified by:
      execute in interface Step
      Returns:
      the result of the Step, expressed as an Outcome
      Throws:
      WikiException - if the step encounters errors while executing

    • getActor

      public abstract Principal getActor()
      The Principal responsible for completing this Step, such as a system user or actor assigned to a Decision.
      Specified by:
      getActor in interface Step
      Returns:
      the responsible Principal

    • getEndTime

      public final Date getEndTime()
      The end time for this Step. This value should be set when the step completes. Returns Step.TIME_NOT_SET if not completed yet.
      Specified by:
      getEndTime in interface Step
      Returns:
      the end time

    • getMessageKey

      public final String getMessageKey()
      Message key for human-friendly name of this Step, including any parameter substitutions. By convention, the message prefix should be a lower-case version of the Step's type, plus a period (e.g., task. and decision.).
      Specified by:
      getMessageKey in interface Step
      Returns:
      the message key for this Step.

    • getOutcome

      public final Outcome getOutcome()
      Returns the Outcome of this Step's processing; by default, Outcome.STEP_CONTINUE.
      Specified by:
      getOutcome in interface Step
      Returns:
      the outcome

    • getStartTime

      public final Date getStartTime()
      The start time for this Step. Returns Step.TIME_NOT_SET if not started yet.
      Specified by:
      getStartTime in interface Step
      Returns:
      the start time

    • isCompleted

      public final boolean isCompleted()
      Determines whether the Step is completed; if not, it is by definition awaiting action by the owner or in process. If a Step has completed, it must also return a non-null result for Step.getOutcome().
      Specified by:
      isCompleted in interface Step
      Returns:
      true if the Step has completed; false if not.

    • isStarted

      public final boolean isStarted()
      Determines whether the Step has started.
      Specified by:
      isStarted in interface Step
      Returns:
      true if the Step has started; false if not.

    • setOutcome

      public final void setOutcome​(Outcome outcome)
      Sets the current Outcome for the step. If the Outcome is a "completion" Outcome, it should also sets the completon time and mark the Step as complete. Once a Step has been marked complete, this method cannot be called again. If the supplied Outcome is not in the set returned by Step.getAvailableOutcomes(), or is not Outcome.STEP_CONTINUE or Outcome.STEP_ABORT, this method returns an IllegalArgumentException. If the caller attempts to set an Outcome and the Step has already completed, this method throws an IllegalStateException.
      Specified by:
      setOutcome in interface Step
      Parameters:
      outcome - whether the step should be considered completed

    • start

      public final void start() throws WikiException
      Starts the Step, and sets the start time to the moment when this method is first invoked. If this Step has already been started, this method throws an IllegalStateException. If the Step cannot be started because the underlying implementation encounters an error, it the implementation should throw a WikiException.
      Specified by:
      start in interface Step
      Throws:
      WikiException - if the step encounters errors while starting

    • getSuccessor

      public final Step getSuccessor​(Outcome outcome)
      Identifies the next Step for a particular Outcome; if there is no next Step for this Outcome, this method returns null.
      Specified by:
      getSuccessor in interface Step
      Parameters:
      outcome - the outcome
      Returns:
      the next step

    • setWorkflow

      public final void setWorkflow​(int workflowId, Map<String,​Serializable> workflowContext)
      method that sets the parent Workflow id and context post-construction.
      Specified by:
      setWorkflow in interface Step
      Parameters:
      workflowId - the parent workflow id to set
      workflowContext - the parent workflow context to set

    • getWorkflowId

      public int getWorkflowId()

    • getWorkflowContext

      public Map<String,​Serializable> getWorkflowContext()

    • addError

      protected final void addError​(String message)
      Protected helper method that adds a String representing an error message to the Step's cached errors list.
      Parameters:
      message - the error message