Package datomic

Interface Entity

public interface Entity
Implements the Entity API for associative navigation by attribute keys. An Entity is lazy - the values of its attributes are not obtained from the db until get or touch are called, after which they are cached in the entity. Note that entities have reference-like equality semantics - Two entities are equal if they have the same id and their databases have the same id

  • Method Summary

    Modifier and Type
    Method
    Description
    Database
    db()
     
    Object
    get(Object key)
    Gets the value of the attribute named by key, and is polymorphic on key type cardinality :many attributes will always return a collection, even when only one value
    Set<String>
    keySet()
     
    Entity
    touch()
    Touches all of the attributes of the entity, including any component entities recursively.

  • Method Details

    • get

      Object get(Object key)
      Gets the value of the attribute named by key, and is polymorphic on key type cardinality :many attributes will always return a collection, even when only one value
      Parameters:
      key - A colon-prefixed string, e.g. ":user/firstName"
      Returns:
      the value(s) of that attribute, or null if none

    • touch

      Entity touch()
      Touches all of the attributes of the entity, including any component entities recursively.
      Returns:
      this Entity

    • keySet

      Set<String> keySet()
      Returns:
      the key names of the attributes

    • db

      Database db()
      Returns:
      the database value that is the basis for this entity