org.openlowcode.server.data.storage

Class JoinQueryCondition<E>

java.lang.Object

org.openlowcode.server.data.storage.QueryCondition

org.openlowcode.server.data.storage.JoinQueryCondition<E>

Type Parameters:

E - the payload of the field on which the join is performed.

public class JoinQueryCondition<E>
extends QueryCondition

A query condition specifying a join between two tables. In current version, only inner join is managed

Author:

Open Lowcode SAS

Nested Class Summary

Nested classes/interfaces inherited from class org.openlowcode.server.data.storage.QueryCondition

QueryCondition.Visitor

Field Summary

Fields inherited from class org.openlowcode.server.data.storage.QueryCondition

MAX_CIRCUIT_BREAKER

Constructor Summary

Constructors

Constructor and Description
JoinQueryCondition(TableAlias maintable, StoredFieldSchema<E> maintablefield, TableAlias sidetable, StoredFieldSchema<E> sidetablefield, QueryOperator<E> joinqueryoperator) creates a join query condition

Method Summary

Modifier and Type	Method and Description
void	accept(QueryCondition.Visitor visitor)
QueryOperator<E>	getJoinqueryoperator()
TableAlias	getMaintable()
StoredFieldSchema<E>	getMaintablefield()
TableAlias	getSidetable()
TableAlias	getSideTableAlias()
StoredFieldSchema<E>	getSidetablefield()
boolean	isSignificant(int circuitbreaker)

Methods inherited from class java.lang.Object

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

Constructor Detail

JoinQueryCondition

public JoinQueryCondition(TableAlias maintable,
                          StoredFieldSchema<E> maintablefield,
                          TableAlias sidetable,
                          StoredFieldSchema<E> sidetablefield,
                          QueryOperator<E> joinqueryoperator)

creates a join query condition

Parameters:

maintable - main table alias for the join condition

maintablefield - field used on the main table for the join condition

sidetable -

sidetablefield -

joinqueryoperator - operator (typically equal)

Method Detail

getMaintable

public TableAlias getMaintable()

Returns:

alias for main table for the join query (all select queries have a main table)

getMaintablefield

public StoredFieldSchema<E> getMaintablefield()

Returns:

the field used for the join on the main table

getSidetable

public TableAlias getSidetable()

Returns:

the side table alias

getSidetablefield

public StoredFieldSchema<E> getSidetablefield()

Returns:

getJoinqueryoperator

public QueryOperator<E> getJoinqueryoperator()

Returns:

the operator to compare the two fields for join. Typically, it is QueryOperatorEqual

getSideTableAlias

public TableAlias getSideTableAlias()

Returns:

the alias of the side table

accept

public void accept(QueryCondition.Visitor visitor)

Specified by:

accept in class QueryCondition

Parameters:

visitor - visitor for query condition

isSignificant

public boolean isSignificant(int circuitbreaker)

Specified by:

isSignificant in class QueryCondition

Returns:

true if condition if significant (e.g. an 'AND' query condition with zero elements is not significant