Package 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
    Description
    J()
     

  • Method Summary

    Modifier and Type
    Method
    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 JoinDescription
    right(com.querydsl.core.types.EntityPath<?> path)
    Add right join for given path
    static List<JoinDescription>
    unrollChildrenJoins(Collection<JoinDescription> joins)
    Collect all joins and its children as a flat collection

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • J

      public J()

  • Method Details

    • 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 an association to be joined
      Returns:
      join description

    • right

      public static JoinDescription right(com.querydsl.core.types.EntityPath<?> path)
      Add right join for given path
      Parameters:
      path - alias of an association 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 as a flat collection
      Parameters:
      joins - root joins
      Returns:
      all joins, including children