com.redhat.lightblue.assoc

Class Conjunct

java.lang.Object

com.redhat.lightblue.assoc.Conjunct

All Implemented Interfaces:

Serializable

public class Conjunct
extends Object
implements Serializable

A query clause that cannot be further broken into conjuncts of a conjunctive normal form query. This class also keeps metadata related to that clause, such as the referred nodes of query plan, fieldinfo, etc. Object identify of conjuncts are preserved during query plan processing. That is, a Conjunct object created for a particular query plan is used again for other incarnation of that query plan, only node associations are changed. So, it is possible to keep maps that map a Conjunct to some other piece of data. This is important in query scoring. Scoring can process conjuncts, and keep data internally to prevent recomputing the cost associated with the conjunct for every possible query plan.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
Conjunct(QueryExpression q, CompositeMetadata compositeMetadata, QueryPlan qplan)

Method Summary

Methods

Modifier and Type	Method and Description
QueryExpression	getClause() Returns the query clause
List<ResolvedFieldInfo>	getFieldInfo() Returns the field information about the fields in the conjunct
QueryPlanNode	getFieldNode(Path field) Returns the query plan node referenced by the field.
List<QueryPlanNode>	getReferredNodes() Returns the nodes referenced by this clause
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Conjunct

public Conjunct(QueryExpression q,
        CompositeMetadata compositeMetadata,
        QueryPlan qplan)

Method Detail

getReferredNodes

public List<QueryPlanNode> getReferredNodes()

Returns the nodes referenced by this clause

getFieldNode

public QueryPlanNode getFieldNode(Path field)

Returns the query plan node referenced by the field. Null if the field is not in this conjunct

getFieldInfo

public List<ResolvedFieldInfo> getFieldInfo()

Returns the field information about the fields in the conjunct

getClause

public QueryExpression getClause()

Returns the query clause

toString

public String toString()

Overrides:

toString in class Object