org.apache.uima.cas

## Interface Marker

-     public interface Marker

  An object obtained from the `CAS` that is used to query when FSs were created or modified with respect to the marker.

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `isModified(FeatureStructure fs)` Test if a FeatureStructure in a CAS represented by this `Marker` existed before the mark was set, and has been modified.
    `boolean` | `isNew(FeatureStructure fs)`
    `boolean` | `isValid()` A Marker becomes invalid when the `CAS` from which it was obtained is reset.

- - ### Method Detail

    - #### isNew

          boolean isNew(FeatureStructure fs)

      Parameters:
        `fs` - -
      Returns:
        true if a `FeatureStructure` was created after the mark represented by this `Marker` object.

    - #### isModified

          boolean isModified(FeatureStructure fs)

      Test if a FeatureStructure in a CAS represented by this `Marker` existed before the mark was set, and has been modified. isModified(fs) == true implies that isNew(fs) == false.
      Parameters:
        `fs` - -
      Returns:
        true if a `FeatureStructure` that existed prior to the mark being set has been modified

    - #### isValid

          boolean isValid()

      A Marker becomes invalid when the `CAS` from which it was obtained is reset.
      Returns:
        true if the Marker is still valid.

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