Package datomic

Interface Attribute

public interface Attribute

Programmatic representation of a schema attribute.

Attribute information always resides in memory, so using this interface is more efficient than accessing the same information from the database via e.g. query.
Since:
0.9.4470

  • Field Details

    • CARDINALITY_MANY

      static final Object CARDINALITY_MANY

    • CARDINALITY_ONE

      static final Object CARDINALITY_ONE

    • UNIQUE_IDENTITY

      static final Object UNIQUE_IDENTITY

    • UNIQUE_VALUE

      static final Object UNIQUE_VALUE

    • TYPE_BIGDEC

      static final Object TYPE_BIGDEC

    • TYPE_BIGINT

      static final Object TYPE_BIGINT

    • TYPE_BOOLEAN

      static final Object TYPE_BOOLEAN

    • TYPE_BYTES

      static final Object TYPE_BYTES

    • TYPE_DOUBLE

      static final Object TYPE_DOUBLE

    • TYPE_FN

      static final Object TYPE_FN

    • TYPE_FLOAT

      static final Object TYPE_FLOAT

    • TYPE_INSTANT

      static final Object TYPE_INSTANT

    • TYPE_KEYWORD

      static final Object TYPE_KEYWORD

    • TYPE_LONG

      static final Object TYPE_LONG

    • TYPE_REF

      static final Object TYPE_REF

    • TYPE_STRING

      static final Object TYPE_STRING

    • TYPE_URI

      static final Object TYPE_URI

    • TYPE_UUID

      static final Object TYPE_UUID

  • Method Details

    • id

      Object id()
      The attribute's entity id
      Returns:
      an entity id

    • ident

      Object ident()
      The attribute's ident (programmatic name)
      Returns:
      an ident

    • valueType

      Object valueType()
      The attribute's value type
      Returns:
      a value type

    • cardinality

      Object cardinality()
      The attribute's cardinality
      Returns:
      either CARDINALITY_MANY or CARDINALITY_ONE

    • unique

      Object unique()
      Type of the attribute's unique index, if any.
      Returns:
      one of UNIQUE_IDENTITY, UNIQUE_VALUE, or null

    • isComponent

      boolean isComponent()
      Is this a component attribute?
      Returns:
      true if :db/isComponent true for this attribute

    • isIndexed

      boolean isIndexed()
      Is this attribute configured for an AVET index?
      Returns:
      true if :db/index true for this attribute, or attribute is unique

    • hasAVET

      boolean hasAVET()

      Does this attribute currently have an AVET index?

      When you alter an existing schema, indexes are created in the background after setting :db/index to true. This method returns true once a recently-added index is ready for use.
      Returns:
      true if AVET index available for this attribute

    • hasNoHistory

      boolean hasNoHistory()
      Is this a noHistory attribute?
      Returns:
      true if :db/noHistory true for this attribute

    • hasFulltext

      boolean hasFulltext()
      Does this attribute have a fulltext index?
      Returns:
      true if :db/fulltext true for this attribute