Package de.julielab.jcore.utility.index

Class TermGenerators

  • public class TermGenerators
extends Object
    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.
    Author:
    faessler

    • Constructor Detail

      • TermGenerators

        public TermGenerators()

    • Method Detail

      • nGramTermGenerator

        public static IndexTermGenerator<String> nGramTermGenerator​(int n)
        Creates strict n-grams of the covered text of an annotation. Returned terms are always of length n. Annotations shorter than n will not return any terms.
        Parameters:
        n - The n-gram size.
        Returns:
        The n-gram index terms.

      • edgeNGramTermGenerator

        public static IndexTermGenerator<String> edgeNGramTermGenerator​(int n)
        Generates all prefixes between length of 1 and length of max(n, annotation.getCoveredText().length()) for an annotation a.
        Parameters:
        n - The maximum prefix length.
        Returns:
        An index generated generating edge n-grams to a maxmimum length of n.

      • prefixTermGenerator

        public static IndexTermGenerator<String> prefixTermGenerator​(int maxLength)
        Generates as a search term the prefix of the covered text of an annotation up to length length. If the annotation is shorter than length the whole annotation text is returned.
        Parameters:
        maxLength - The maximum prefix length.
        Returns:
        The annotation text prefix of maximum length length

      • suffixTermGenerator

        public static IndexTermGenerator<String> suffixTermGenerator​(int maxLength)
        Generates as a search term the suffix of the covered text of an annotation up to length length. If the annotation is shorter than length the whole annotation text is returned.
        Parameters:
        maxLength - The maximum suffix length.
        Returns:
        The annotation text suffix of maximum length length

      • exactPrefixTermGenerator

        public static IndexTermGenerator<String> exactPrefixTermGenerator​(int length)
        Generates as a search term the prefix of the covered text of an annotation of length length. If the annotation is shorter than length no terms are generated.
        Parameters:
        length - The prefix length.
        Returns:
        The annotation text prefix of length length

      • exactSuffixTermGenerator

        public static IndexTermGenerator<String> exactSuffixTermGenerator​(int length)
        Generates as a search term the suffix of the covered text of an annotation of length length. If the annotation is shorter than length no terms are generated.
        Parameters:
        length - The suffix length.
        Returns:
        The annotation text suffix of length length