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 query analysis information along with the clause Object identity 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, List<QueryFieldInfo> fieldInfo, ResolvedReferenceField reference)

Method Summary

Modifier and Type	Method and Description
QueryExpression	getClause() Returns the query clause
Set<CompositeMetadata>	getEntities() Returns a set of entities this conjunct refers to
List<QueryFieldInfo>	getFieldInfo() Returns the field information about the fields in the conjunct
ResolvedReferenceField	getReference()
boolean	isRequestQuery() Returns true if the clause belongs to a request query, not to a reference field
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,
                List<QueryFieldInfo> fieldInfo,
                ResolvedReferenceField reference)

Method Detail

isRequestQuery

public boolean isRequestQuery()

Returns true if the clause belongs to a request query, not to a reference field

getReference

public ResolvedReferenceField getReference()

getFieldInfo

public List<QueryFieldInfo> getFieldInfo()

Returns the field information about the fields in the conjunct

getClause

public QueryExpression getClause()

Returns the query clause

getEntities

public Set<CompositeMetadata> getEntities()

Returns a set of entities this conjunct refers to

toString

public String toString()

Overrides:

toString in class Object