Package de.julielab.jcore.utility.index

In the this package, a range of JCoReAnnotationIndex implementations can be found.

See: Description

Interface Summary

Interface	Description
IndexTermGenerator<K extends Comparable<K>>	An interface that defines a way to construct index or search terms from an annotation a.
JCoReAnnotationIndex<T extends org.apache.uima.jcas.tcas.Annotation>	A common interface for JCoRe annotation indexes.

Class Summary

Class	Description
Comparators	This class offers some commonly used comparators on annotations.
JCoReCoverIndex<E extends org.apache.uima.jcas.tcas.Annotation>	Use when: You need access to annotations between a given begin- and end-offset or completely covered by another annotation.
JCoReHashMapAnnotationIndex<K extends Comparable<K>,T extends org.apache.uima.jcas.tcas.Annotation>	Use when: You basically just need a map that maps from some key to annotations associated with that key.
JCoReMapAnnotationIndex<K extends Comparable<K>,T extends org.apache.uima.jcas.tcas.Annotation>	Use when: You want to access annotations by an some arbitrary key that should be computed once and then only used for access.
JCoReOverlapAnnotationIndex<E extends org.apache.uima.jcas.tcas.Annotation>	Use when: You need to access arbitrary annotations that are in any way overlapped by an input annotation (warning: these quite loose restrictions cause a relatively high search complexity, see below).
JCoReSetAnnotationIndex<E extends org.apache.uima.jcas.tcas.Annotation>	Use when: You just want an ordered set of annotations that can be retrieved according to an Comparator.
JCoReTreeMapAnnotationIndex<K extends Comparable<K>,T extends org.apache.uima.jcas.tcas.Annotation>	Use when: You want a fuzzy search on the index keys (please see the note in the next paragraph) or ou specifically need a TreeMap instead of a HashMap (if not, refer to JCoReHashMapAnnotationIndex) for some other reason.
TermGenerators	This class offers a range of predefined term generators (to be used as a constructor argument to JCoReMapAnnotationIndex that might be useful in a range of applications.
TermGenerators.LongOffsetIndexTermGenerator

Package de.julielab.jcore.utility.index Description

In the this package, a range of JCoReAnnotationIndex implementations can be found. These classes leverage the Map and TreeSet classes to structure a given set of annotations by some comparator, e.g. start offset comparator. After a first run where a concrete index implementation is filled with the annotations from a CAS, the CAS annotation indices can be left alone and the index can be consulted efficiently for specific annotations. This is used, for example, using the overlap comparator defined in Comparators. With this comparator, one can find annotations overlapping a given annotation. When using a map annotation index, the map keys are so-called IndexTerms. Consult the TermGenerators class for predefined index term generators which are used for indexing and for searching. Index terms can be long numbers encoding start and end offsets of annotations, for example, allowing for a very efficient retrieval of overlapping annotations.