Package org.eclipse.rdf4j.sail.lucene

Enum TypeBacktraceMode

  • All Implemented Interfaces:
    Serializable, Comparable<TypeBacktraceMode>
    public enum TypeBacktraceMode
extends Enum<TypeBacktraceMode>
    Option to describe how the LuceneSail should handle the add of a new type statement in a connection if the LuceneSail.INDEXEDTYPES property is defined.

    Backtrace example

    For example if we have the predicate my:text indexed by Lucene and (my:oftype my:type1) as an LuceneSail.INDEXEDTYPES, the previous store state is 
     # Store triples:
 my:subj1 my:text   "demo 1" .
 my:subj2 my:oftype my:type1 .
 my:subj2 my:text   "demo 2" .
 # Lucene Indexed literals:
 my:subj2 "demo 2"

    The option will define how the Sail will handle the update: 

     INSERT my:subj1 my:oftype my:type1 .
 DELETE my:subj2 my:oftype my:type1 .

    • Enum Constant Detail

      • COMPLETE

        public static final TypeBacktraceMode COMPLETE
        The sail will get all previous triples of the subject and add them (if required) in the Lucene index, this mode is enabled by default.

        the future state of the Lucene index in the above example would be: 

         my:subj1 "demo 1"

      • PARTIAL

        public static final TypeBacktraceMode PARTIAL
        The sail won't get any previous triples of the subject in the Lucene index, this mode is useful if you won't change the type and values of your subjects in multiple queries.

        the future state of the Lucene index in the above example would be: 

         my:subj2 "demo 2"

    • Field Detail

      • DEFAULT_TYPE_BACKTRACE_MODE

        public static final TypeBacktraceMode DEFAULT_TYPE_BACKTRACE_MODE
        Default backtrace mode

    • Method Detail

      • values

        public static TypeBacktraceMode[] values()
        Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows: 
        for (TypeBacktraceMode c : TypeBacktraceMode.values())
    System.out.println(c);
        Returns:
        an array containing the constants of this enum type, in the order they are declared

      • valueOf

        public static TypeBacktraceMode valueOf​(String name)
        Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
        Parameters:
        name - the name of the enum constant to be returned.
        Returns:
        the enum constant with the specified name
        Throws:
        IllegalArgumentException - if this enum type has no constant with the specified name
        NullPointerException - if the argument is null

      • shouldBackTraceInsert

        public boolean shouldBackTraceInsert()
        Returns:
        if the index should backtrace over the old properties on an add

      • shouldBackTraceDelete

        public boolean shouldBackTraceDelete()
        Returns:
        if the index should backtrace over the old properties on a delete