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## 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 Summary
`JCasFlowController_ImplBase()`

Method Summary
`Flow` | `computeFlow(AbstractCas aCAS)` Overriden to check that `aCAS` is an instanceof `JCas`.
`abstract Flow` | `computeFlow(JCas aJCas)` This method must be overriden by subclasses.
`Class` | `getRequiredCasInterface()` Returns the specific CAS interface that this FlowController requires the framework to pass to its `FlowController.computeFlow(AbstractCas)` method.

Methods inherited from class org.apache.uima.flow.FlowController_ImplBase
`addAnalysisEngines, batchProcessComplete, collectionProcessComplete, destroy, getContext, initialize, reconfigure, removeAnalysisEngines`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### JCasFlowController_ImplBase

    public JCasFlowController_ImplBase()

Method Detail

### getRequiredCasInterface

    public Class 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`

### 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:
    `FlowController.computeFlow(AbstractCas)`

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Copyright © 2007 The Apache Software Foundation. All Rights Reserved.