Package org.apache.uima.flow

Class JCasFlowController_ImplBase

java.lang.Object
org.apache.uima.flow.FlowController_ImplBase
org.apache.uima.flow.JCasFlowController_ImplBase
All Implemented Interfaces:
FlowController
public abstract class JCasFlowController_ImplBase extends FlowController_ImplBase
Base class to be extended by FlowControllers that use the JCas interface.

  • Constructor Details

    • JCasFlowController_ImplBase

      public JCasFlowController_ImplBase()

  • Method Details

    • getRequiredCasInterface

      public Class<JCas> getRequiredCasInterface()
      Description copied from interface: FlowController
      Returns the specific CAS interface that this FlowController requires the framework to pass to its FlowController.computeFlow(AbstractCas) method.
      Returns:
      the required CAS interface. This must specify a subtype of AbstractCas.

    • computeFlow

      public final Flow computeFlow(AbstractCas aCAS) throws AnalysisEngineProcessException
      Overriden to check that aCAS is an instanceof JCas. If it is, then computeFlow(JCas) is called. If not, an exception is thrown.
      Parameters:
      aCAS - A CAS that this FlowController should process. The framework will ensure that aCAS implements the specific CAS interface declared in the <casInterface> element of this FlowController's descriptor.
      Returns:
      a Flow object that has responsibility for routing aCAS through the Aggregate Analysis Engine.
      Throws:
      AnalysisEngineProcessException - if this FlowController encounters a problem computing the flow for the CAS

    • computeFlow

      public abstract Flow computeFlow(JCas aJCas) throws AnalysisEngineProcessException
      This method must be overriden by subclasses. It takes a JCas and returns a Flow object that is responsible for routing this particular JCas through the components of this Aggregate. The Flow object should be given a handle to the JCas, so that it can use information in the CAS to make routing decisions.

      FlowController implementations will typically define their own class that implements Flow by extending from the base class JCasFlow_ImplBase. This method would then just instantiate the flow object, call its setCas method to provide a handle to the JCas, and return the flow object.

      Parameters:
      aJCas - the JCas to be routed
      Returns:
      a Flow object that will be used to route aJCas
      Throws:
      AnalysisEngineProcessException - if a problem occurs during processing
      See Also: