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• a field for each feature
• a reference to the _Type instance
  • only for backwards compatibility for low-level access model
  • One instance Multiple instances per type system - one per CAS
  • has ref to TypeImpl?
• a reference to the CAS View (to support addToIndexes for the right view)
• a ref to a type-system-wide Bitset for index corruption testing
• Constructors
  • new Foo(Cas)
• Methods
  • getter / setter for all fields
    
    • The setter methods may include index corruption checking code.
      • May be code which tests at runtime on each set, whether or not this 
  • indexed getter/setter for fields defined as arrays
  • (via inheritance) 
    • a collection of get/set methods, one per boolean/byte/short.../double/String/TOP/JavaObject and arrays of these, kinds of values.
      • The methods take an extra "offset" value, obtained from the Feature.
      • Used for backwards compatibility with non-JCas styles, and for serialization and other "generic" operations

x.y.z.Foo_Type 

An instance is loaded when a new x.y.z.Foo(some-cas) is done, lazily.  

has

• a ref to the TypeImpl
• a ref to the CAS (an arbitrary view, sometimes updated in v2), used for low level access patterns

Instances are accessed per CAS via

• a Map (kept per CAS) from the x.y.z.Foo Class to the corresponding x.y.z.Foo_type instance.  
  • The key is a x.y.z.Foo Class object, so instances loaded under different class loaders may have the same class name.  This used to happen for PEARS (but not in v3).
    • This happens when different generated x.y.z.Foo (due to different merged type systems) are running in the same JVM.
    • This used to happen within one pipeline with PEAR switching, where the PEAR might have a different customization of a JCas class.  In v3, that doesn't happen; all versions of a customization must be merged.
  • If the Map has no entry, 
    • Load the _Type class itself, if not loaded (Map in TypeSystemImpl instance, key = name string, value = _Type Class). 
    • Make instance of it, populate map in CAS.svd.