cz.encircled.joiner.query.join

Class J

java.lang.Object

cz.encircled.joiner.query.join.J

public class J
extends Object

This class contains helper methods for joins building

Author:

Kisel on 26.01.2016.

Constructor Summary

Constructors

Constructor and Description
J()

Method Summary

Modifier and Type	Method and Description
static JoinDescription	inner(com.querydsl.core.types.dsl.CollectionPathBase<?,?,?> path) Add inner join for given path
static JoinDescription	inner(com.querydsl.core.types.EntityPath<?> path) Add inner join for given path
static JoinDescription	left(com.querydsl.core.types.dsl.CollectionPathBase<?,?,?> path) Add left join for given path
static JoinDescription	left(com.querydsl.core.types.EntityPath<?> path) Add left join for given path
static <P extends com.querydsl.core.types.dsl.SimpleExpression<?>,T extends com.querydsl.core.types.EntityPath<P>> P	path(com.querydsl.core.types.dsl.CollectionPathBase<?,?,P> path) Aliases of nested joins are determined at runtime.
static <T extends com.querydsl.core.types.EntityPath> T	path(com.querydsl.core.types.EntityPath<?> grandFather, com.querydsl.core.types.EntityPath<?> father, T path) Aliases of nested joins are determined at runtime.
static <T extends com.querydsl.core.types.EntityPath> T	path(com.querydsl.core.types.EntityPath<?> parent, T path) Aliases of nested joins are determined at runtime.
static List<JoinDescription>	unrollChildrenJoins(Collection<JoinDescription> joins) Collect all joins and its children to single collection

Methods inherited from class java.lang.Object

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

Constructor Detail

J

public J()

Method Detail

path

public static <P extends com.querydsl.core.types.dsl.SimpleExpression<?>,T extends com.querydsl.core.types.EntityPath<P>> P path(com.querydsl.core.types.dsl.CollectionPathBase<?,?,P> path)

Aliases of nested joins are determined at runtime. To refer a nested join, this method should be used to get a correct alias. For example, there is a query

Q.from(QGroup.group).joins(J.left(QPerson.person).nested(J.left(QContact.contact)))

To refer a Contact entity in the 'where' clause, one should use J.path(QPerson.person.contacts).number.eq(12345)

Type Parameters:

T - any entity path

Parameters:

path - path on parent entity

Returns:

entity path with correct alias

path

public static <T extends com.querydsl.core.types.EntityPath> T path(com.querydsl.core.types.EntityPath<?> parent,
                                                                    T path)

Aliases of nested joins are determined at runtime. To refer a nested join, this method should be used to get a correct alias. For example, there is a query

Q.from(QGroup.group).joins(J.left(QPerson.person).nested(J.left(QContact.contact)))

To refer a Contact entity in the 'where' clause, one should use J.path(QPerson.person, QContact.contact).number.eq(12345)

Type Parameters:

T - any entity path

Parameters:

parent - parent join path

path - target join path

Returns:

entity path with correct alias

path

public static <T extends com.querydsl.core.types.EntityPath> T path(com.querydsl.core.types.EntityPath<?> grandFather,
                                                                    com.querydsl.core.types.EntityPath<?> father,
                                                                    T path)

Aliases of nested joins are determined at runtime. To refer a nested join, this method should be used to get a correct alias. For example, there is a query

Q.from(QGroup.group).joins(J.left(QPerson.person).nested(J.left(QContact.contact).nested(QStatus.status)))

To refer a Status entity in the 'where' clause, one should use J.path(QPerson.person, QContact.contact. QStatus.status).state.eq("active")

Type Parameters:

T - any entity path

Parameters:

grandFather - parent of parent join path

father - parent join path

path - target join path

Returns:

entity path with correct alias

left

public static JoinDescription left(com.querydsl.core.types.EntityPath<?> path)

Add left join for given path

Parameters:

path - alias of object to be joined

Returns:

join description

left

public static JoinDescription left(com.querydsl.core.types.dsl.CollectionPathBase<?,?,?> path)

Add left join for given path

Parameters:

path - path to an object to be joined

Returns:

join description

inner

public static JoinDescription inner(com.querydsl.core.types.EntityPath<?> path)

Add inner join for given path

Parameters:

path - alias of object to be joined

Returns:

join description

inner

public static JoinDescription inner(com.querydsl.core.types.dsl.CollectionPathBase<?,?,?> path)

Add inner join for given path

Parameters:

path - path to an object to be joined

Returns:

join description

unrollChildrenJoins

public static List<JoinDescription> unrollChildrenJoins(Collection<JoinDescription> joins)

Collect all joins and its children to single collection

Parameters:

joins - root joins

Returns:

all joins, including children