Field (Google App Engine API for Java)

Class Field

  • java.lang.Object
  • All Implemented Interfaces:

    public final class Field
    extends java.lang.Object
    Represents a field of a Document, which is a name, an optional locale, and at most one value: text, HTML, atom, date, GeoPoint, untokenizedPrefix, tokenizedPrefix or vector. Field name lengths are between 1 and SearchApiLimits.MAXIMUM_NAME_LENGTH characters, and text and HTML values are limited to SearchApiLimits.MAXIMUM_TEXT_LENGTH. Atoms are limited to SearchApiLimits.MAXIMUM_ATOM_LENGTH characters, both prefix types are limited to SearchApiLimits.MAXIMUM_PREFIX_LENGTH . Vector field size is limited to SearchApiLimits.VECTOR_FIELD_MAX_SIZE and dates must not have a time component.

    There are 5 types of text fields, ATOM, TEXT, HTML, UNTOKENIZED_PREFIX, and TOKENIZED_PREFIX. Atom fields when queried, are checked for equality. For example, if you add a field with name code and an ATOM value of "928A 33B-1", then query code:"928A 33B-1" would match the document with this field, while query code:928A would not. TEXT fields, unlike ATOM, match both on equality or if any token extracted from the original field matches. Thus if code field had the value set with Field.Builder.setText(String) method, both queries would match. HTML fields have HTML tags stripped before tokenization. Untokenized prefix fields match queries that are prefixes containing the contiguous starting characters of the whole field. For example if the field was "the quick brown fox", the query "the qui" would match whereas "th qui" would not. On the other hand, Tokenized prefix fields match if the query terms are prefixes of individual terms in the field. If the query is a phrase of terms, the ordering of the terms will matter. For example if the field is "the quick brown fox", the query "th qui bro" would match whereas "bro qui the" would not. Vector fields are only used to compute the dot product between a given constant vector and the provided vector field for sorting and field expressions only. for example, if a 3d vector is named "scores" and has a value of (1,2,3) then the expression dot(scores, vector(3,2,1)) will be evaluated to 10.

    See Also:
    Serialized Form
    • Method Detail

      • getName

        public java.lang.String getName()
        the name of the field
      • getType

        public Field.FieldType getType()
        the type of value of the field. Can be null
      • getText

        public java.lang.String getText()
        the text value of the field. Can be null
      • getHTML

        public java.lang.String getHTML()
        the HTML value of the field. Can be null
      • getAtom

        public java.lang.String getAtom()
        the atomic value of the field. Can be null
      • getDate

        public java.util.Date getDate()
        the date value of the field. Can be null
      • getNumber

        public java.lang.Double getNumber()
        the numeric value of the field. Can be null
      • getGeoPoint

        public GeoPoint getGeoPoint()
        the GeoPoint value of the field. Can be null
      • getUntokenizedPrefix

        public java.lang.String getUntokenizedPrefix()
        the String value of the untokenized prefix field. Can be null
      • getTokenizedPrefix

        public java.lang.String getTokenizedPrefix()
        the String value of the tokenized prefix field. Can be null
      • getVector

        public java.util.List<java.lang.Double> getVector()
        the vector value of the field.
      • getLocale

        public java.util.Locale getLocale()
        the locale the field value is written in. Can be null. If none is given the locale of the document will be used
      • hashCode

        public int hashCode()
        hashCode in class java.lang.Object
      • equals

        public boolean equals(java.lang.Object object)
        equals in class java.lang.Object
      • newBuilder

        public static Field.Builder newBuilder()
        Creates a field builder.
        a new builder for creating fields
      • toString

        public java.lang.String toString()
        toString in class java.lang.Object