org.apache.uima.flow

## Class CasFlow_ImplBase

- java.lang.Object
- - org.apache.uima.flow.CasFlow_ImplBase

- All Implemented Interfaces:
    Flow

      public abstract class CasFlow_ImplBase
      extends Object
      implements Flow

  Convenience base class for Flow objects that use the CAS interface. Stores the CAS in a field made accessible through the protected `getCas()` method.

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `CasFlow_ImplBase()`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods Deprecated Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `aborted()` By default, does nothing.
    `boolean` | `continueOnFailure(String failedAeKey, Exception failure)` By default, returns false, indicating that processing cannot continue after a failure.
    `protected CAS` | `getCas()` Gets the CAS being routed by this Flow object.
    `Flow` | `newCasProduced(AbstractCas newCas, String producedBy)` Overriden to check that `newCas` is an instanceof `CAS`.
    `protected Flow` | `newCasProduced(CAS newCas, String producedBy)` By default, throws an exception to indicate this this Flow object does not support new CASes being produced in the middle of the flow.
    `void` | `setCas(CAS aCAS)` Deprecated. this is automatically done by the framework after a new flow object is created

    - ### Methods inherited from class java.lang.Object

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

    - ### Methods inherited from interface org.apache.uima.flow.Flow

      `next`

- - ### Constructor Detail

    - #### CasFlow_ImplBase

          public CasFlow_ImplBase()

  - ### Method Detail

    - #### setCas

          @Deprecated
          public void setCas(CAS aCAS)

      Deprecated. this is automatically done by the framework after a new flow object is created
      Sets the CAS to be routed by this Flow object. This should be called from the `FlowController.computeFlow(AbstractCas)` method after this Flow object is instantiated.
      Parameters:
        `aCAS` - the CAS to be routed by this Flow object

    - #### newCasProduced

          public final Flow newCasProduced(AbstractCas newCas,
                                           String producedBy)
                                    throws AnalysisEngineProcessException

      Overriden to check that `newCas` is an instanceof `CAS`. If it is, then `newCasProduced(CAS,String)` is called. If not, an exception is thrown.
      Specified by:
        `newCasProduced` in interface `Flow`
      Parameters:
        `newCas` - the new CAS
        `producedBy` - key of the AnalysisEngine (CAS Multiplier) that produced the new CAS
      Returns:
        a new Flow object that has responsibility for routing `aCAS` through the Aggregate Analysis Engine.
      Throws:
        `AnalysisEngineProcessException` - passthru
      See Also:
        `Flow.newCasProduced(AbstractCas, String)`

    - #### continueOnFailure

          public boolean continueOnFailure(String failedAeKey,
                                           Exception failure)

      By default, returns false, indicating that processing cannot continue after a failure. May be overridden by subclasses to allow processing to continue.
      Specified by:
        `continueOnFailure` in interface `Flow`
      Parameters:
        `failedAeKey` - The key of the analysis engine that failed.
        `failure` - the Exception that occurred
      Returns:
        true if the FlowController decides that processing of the CAS can continue; false if processing of the CAS should be aborted.
      See Also:
        `Flow.continueOnFailure(String, java.lang.Exception)`

    - #### aborted

          public void aborted()

      By default, does nothing. May be overriden by subclasses to release resources when a flow is aborted.
      Specified by:
        `aborted` in interface `Flow`
      See Also:
        `Flow.aborted()`

    - #### newCasProduced

          protected Flow newCasProduced(CAS newCas,
                                        String producedBy)
                                 throws AnalysisEngineProcessException

      By default, throws an exception to indicate this this Flow object does not support new CASes being produced in the middle of the flow. Subclasses can override to implement handling for this.
      Parameters:
        `newCas` - the new CAS
        `producedBy` - the key of the CAS Multiplier that produced this CAS
      Returns:
        a Flow object that will be used to route the new CAS
      Throws:
        `AnalysisEngineProcessException` - passthru
      See Also:
        `Flow.newCasProduced(AbstractCas, String)`

    - #### getCas

          protected CAS getCas()

      Gets the CAS being routed by this Flow object.
      Returns:
        the CAS being routed by this Flow object

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