for implementation of callback evaluations.
For a list of all members of this type, see Evaluation Members.
Remarks
for implementation of callback evaluations.
To constrain a com.db4o.query.Query node with your own callback
Evaluation
, construct an object that implements the
Evaluation
interface and register it by passing it to
constrain .
Evaluations are called as the last step during query execution, after all other constraints have been applied. Evaluations in higher level
com.db4o.query.Query nodes in the query graph are called first.
Java client/server only:
db4o first attempts to use Java Serialization to allow to pass final variables to the server. Please make sure that all variables that are used within the evaluate() method are Serializable. This may include the class an anonymous Evaluation object is created in. If db4o is not successful at using Serialization, the Evaluation is transported to the server in a db4o MemoryFile. In this case final variables can not be restored.
Requirements
Namespace:
com.db4o.query
Assembly: db4o (in db4o.dll)
See Also
Evaluation Members | com.db4o.query Namespace