org.opencastproject.util.persistencefn

Class Queries

java.lang.Object

org.opencastproject.util.persistencefn.Queries

public final class Queries
extends Object

JPA query constructors.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Queries.QueriesBase<P>
static class	Queries.TypedQueriesBase<P>

Field Summary

Fields

Modifier and Type	Field and Description
static Queries.TypedQueriesBase<com.entwinemedia.fn.P2<String,?>>	jpql JPQL queries with support for named parameters.
static Queries.TypedQueriesBase<com.entwinemedia.fn.P2<String,?>>	named Named queries with support for named parameters.
static Queries.QueriesBase<Object>	sql Native SQL queries.

Method Summary

Modifier and Type	Method and Description
static com.entwinemedia.fn.Fn<javax.persistence.EntityManager,Boolean>	contains(Object a) EntityManager.contains(Object) as a function.
static <A> com.entwinemedia.fn.Fn<javax.persistence.EntityManager,com.entwinemedia.fn.data.Opt<A>>	find(Class<A> clazz, Object primaryKey) EntityManager.find(Class, Object) as a function wrapping the result into an Option.
static Object	getId(javax.persistence.EntityManager em, Object a) Convenience for EntityManager.getEntityManagerFactory().getPersistenceUnitUtil().getIdentifier(a).
static <A> com.entwinemedia.fn.Fn<javax.persistence.EntityManager,A>	getId(Object a) getId(EntityManager, Object) as a function.
static <A> com.entwinemedia.fn.Fn<javax.persistence.EntityManager,A>	merge(A a) EntityManager.merge(Object) as a function.
static <A> com.entwinemedia.fn.Fn<javax.persistence.EntityManager,A>	persist(A a) EntityManager.persist(Object) as a function.
static <A> com.entwinemedia.fn.Fn<javax.persistence.EntityManager,A>	persistOrUpdate(A a) persistOrUpdate(EntityManager, Object) as a function.
static <A> A	persistOrUpdate(javax.persistence.EntityManager em, A a) If the object does not have an ID, persist it.
static void	remove(javax.persistence.EntityManager em, Object a) Like EntityManager.remove(Object) but the entity is allowed to be detached.
static com.entwinemedia.fn.Fn<javax.persistence.EntityManager,com.entwinemedia.fn.Unit>	remove(Object a) remove(EntityManager, Object) as a function.
static <A extends javax.persistence.Query> A	setParams(A q, Object... params) Set a list of positional parameters on a query.
static <A extends javax.persistence.Query> A	setParams(A q, com.entwinemedia.fn.P2<String,?>... params) Set a list of named parameters on a query.
static <A> com.entwinemedia.fn.Fn<javax.persistence.EntityManager,A>	sum(com.entwinemedia.fn.Monoid<A> m, com.entwinemedia.fn.Fn<javax.persistence.EntityManager,A>... qs) Compose multiple queries qs and sum up their results.

Methods inherited from class java.lang.Object

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

Field Detail

named

public static final Queries.TypedQueriesBase<com.entwinemedia.fn.P2<String,?>> named

Named queries with support for named parameters.

jpql

public static final Queries.TypedQueriesBase<com.entwinemedia.fn.P2<String,?>> jpql

JPQL queries with support for named parameters.

sql

public static final Queries.QueriesBase<Object> sql

Native SQL queries. Only support positional parameters.

Method Detail

find

public static <A> com.entwinemedia.fn.Fn<javax.persistence.EntityManager,com.entwinemedia.fn.data.Opt<A>> find(Class<A> clazz,
                                                                                                               Object primaryKey)

EntityManager.find(Class, Object) as a function wrapping the result into an Option.

persist

public static <A> com.entwinemedia.fn.Fn<javax.persistence.EntityManager,A> persist(A a)

EntityManager.persist(Object) as a function.

merge

public static <A> com.entwinemedia.fn.Fn<javax.persistence.EntityManager,A> merge(A a)

EntityManager.merge(Object) as a function.

contains

public static com.entwinemedia.fn.Fn<javax.persistence.EntityManager,Boolean> contains(Object a)

EntityManager.contains(Object) as a function. The function returns true if the entity is a managed instance belonging to the current persistence context.

getId

public static Object getId(javax.persistence.EntityManager em,
                           Object a)

Convenience for EntityManager.getEntityManagerFactory().getPersistenceUnitUtil().getIdentifier(a). The function returns the ID or null if the object does not have an ID yet, i.e. is not yet persisted.

getId

public static <A> com.entwinemedia.fn.Fn<javax.persistence.EntityManager,A> getId(Object a)

getId(EntityManager, Object) as a function.

remove

public static void remove(javax.persistence.EntityManager em,
                          Object a)

Like EntityManager.remove(Object) but the entity is allowed to be detached. It will be merged into the current persistence context if necessary.

remove

public static com.entwinemedia.fn.Fn<javax.persistence.EntityManager,com.entwinemedia.fn.Unit> remove(Object a)

remove(EntityManager, Object) as a function.

persistOrUpdate

public static <A> A persistOrUpdate(javax.persistence.EntityManager em,
                                    A a)

If the object does not have an ID, persist it. If it does, try to update it.

persistOrUpdate

public static <A> com.entwinemedia.fn.Fn<javax.persistence.EntityManager,A> persistOrUpdate(A a)

persistOrUpdate(EntityManager, Object) as a function.

setParams

public static <A extends javax.persistence.Query> A setParams(A q,
                                                              com.entwinemedia.fn.P2<String,?>... params)

Set a list of named parameters on a query.

Values of type Date and AbstractInstant are recognized and set as a timestamp (TemporalType.TIMESTAMP.

setParams

public static <A extends javax.persistence.Query> A setParams(A q,
                                                              Object... params)

Set a list of positional parameters on a query.

Values of type Date and AbstractInstant are recognized and set as a timestamp (TemporalType.TIMESTAMP.

sum

@SafeVarargs
public static <A> com.entwinemedia.fn.Fn<javax.persistence.EntityManager,A> sum(com.entwinemedia.fn.Monoid<A> m,
                                                                                             com.entwinemedia.fn.Fn<javax.persistence.EntityManager,A>... qs)

Compose multiple queries qs and sum up their results.

Parameters:

m - monoid to sum up results

qs - list of queries

Returns:

the sum of the results