Package org.apache.lucene.index

Class Term

  • All Implemented Interfaces:
    Comparable<Term>, Accountable
    public final class Term
extends Object
implements Comparable<Term>, Accountable
    A Term represents a word from text. This is the unit of search. It is composed of two elements, the text of the word, as a string, and the name of the field that the text occurred in.

    Note that terms may represent more than words from text fields, but also things like dates, email addresses, urls, etc.

    • Constructor Detail

      • Term

        public Term​(String fld,
            BytesRef bytes)
        Constructs a Term with the given field and bytes.

        Note that a null field or null bytes value results in undefined behavior for most Lucene APIs that accept a Term parameter.

        The provided BytesRef is copied when it is non null.

      • Term

        public Term​(String fld,
            BytesRefBuilder bytesBuilder)
        Constructs a Term with the given field and the bytes from a builder.

        Note that a null field value results in undefined behavior for most Lucene APIs that accept a Term parameter.

      • Term

        public Term​(String fld,
            String text)
        Constructs a Term with the given field and text.

        Note that a null field or null text value results in undefined behavior for most Lucene APIs that accept a Term parameter.

      • Term

        public Term​(String fld)
        Constructs a Term with the given field and empty text. This serves two purposes: 1) reuse of a Term with the same field. 2) pattern for a query.
        Parameters:
        fld - field's name

    • Method Detail

      • field

        public final String field()
        Returns the field of this term. The field indicates the part of a document which this term came from.

      • text

        public final String text()
        Returns the text of this term. In the case of words, this is simply the text of the word. In the case of dates and other types, this is an encoding of the object as a string.

      • toString

        public static final String toString​(BytesRef termText)
        Returns human-readable form of the term text. If the term is not unicode, the raw bytes will be printed instead.

      • bytes

        public final BytesRef bytes()
        Returns the bytes of this term, these should not be modified.

      • hashCode

        public int hashCode()
        Overrides:
        hashCode in class Object

      • compareTo

        public final int compareTo​(Term other)
        Compares two terms, returning a negative integer if this term belongs before the argument, zero if this term is equal to the argument, and a positive integer if this term belongs after the argument.

        The ordering of terms is first by field, then by text.

        Specified by:
        compareTo in interface Comparable<Term>

      • ramBytesUsed

        public long ramBytesUsed()
        Description copied from interface: Accountable
        Return the memory usage of this object in bytes. Negative values are illegal.
        Specified by:
        ramBytesUsed in interface Accountable