Package datomic
Interface Entity
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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
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description Database
db()
java.lang.Object
get(java.lang.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 valuejava.util.Set<java.lang.String>
keySet()
Entity
touch()
Touches all of the attributes of the entity, including any component entities recursively.
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Method Detail
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get
java.lang.Object get(java.lang.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
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touch
Entity touch()
Touches all of the attributes of the entity, including any component entities recursively.- Returns:
- this Entity
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keySet
java.util.Set<java.lang.String> keySet()
- Returns:
- the key names of the attributes
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db
Database db()
- Returns:
- the database value that is the basis for this entity
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