Package org.apache.uima.cas_data

Interface CasData

All Superinterfaces:
Serializable
All Known Implementing Classes:
CasDataImpl
public interface CasData extends Serializable
Interface for directly accessing and manipulating the data in the Common Analysis Structure.

The CAS Data is a collection of FeatureStructures, where each FeatureStructure has an optional ID, a type (represented as a string), and a collection of features, which are attribute-value pairs. Feature names are strings, and their values may be primitives (String, integer, or float) or references, via ID, to one or more other FeatureStructures. Circular references are allowed.

Note on Arrays: Arrays are represented by ArrayFS, which is a subtype of FeatureStructure. Arrays are NOT primitive values. See FeatureStructure for more information.

FeatureStructures also have a property indexed, which determines whether the FeatureStructure should be added to the CAS's indexes if the CAS Data is converted to a CAS Object. The CasData itself does not provide indexes.

  • Method Details

    • getFeatureStructures

      Iterator<FeatureStructure> getFeatureStructures()
      Get an iterator over all top-level FeatureStructures, in no particular order.
      Returns:
      an iterator over FeatureStructure objects.

    • addFeatureStructure

      void addFeatureStructure(FeatureStructure aFS)
      Adds a FeatureStructure to the list of top-level FeatureStructures contained in this CasData.
      Parameters:
      aFS - the FeatureStructure to be added

    • removeFeatureStructure

      void removeFeatureStructure(FeatureStructure aFS)
      Removes a FeatureStructure to this CasData. Note that this only removes the FeatureStructure from the top-level list. If the FeatureStructure is a value of a feature, it is will still be accessible through that path.
      Parameters:
      aFS - the FeatureStructure to be removed