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/*
* Copyright 2014 - 2020 Blazebit.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.blazebit.persistence.spi;
import com.blazebit.persistence.JoinType;
import javax.persistence.EntityManager;
import javax.persistence.Query;
import javax.persistence.metamodel.EntityType;
import javax.persistence.metamodel.ManagedType;
import java.util.List;
import java.util.Map;
/**
* A JPA provider implementation provides information about which features are supported by a JPA implementation.
*
* @author Christian Beikov
* @since 1.2.0
*/
public interface JpaProvider {
/**
* Whether JPA 2.1 specification is supported.
*
* @return True if JPA 2.1 is supported, false otherwise
*/
public boolean supportsJpa21();
/**
* Whether Entity Joins are supported.
*
* @return True if Entity Joins are supported, false otherwise
*/
public boolean supportsEntityJoin();
/**
* Whether Insert statements are supported.
*
* @return True if Insert statements are supported, false otherwise
*/
public boolean supportsInsertStatement();
/**
* Whether brackets are needed around a list parameter.
*
* @return True if brackets are needed, false otherwise
*/
public boolean needsBracketsForListParameter();
/**
* Returns whether key restricted left joins should be rewritten to subquery joins.
* This is part of the workaround for https://hibernate.atlassian.net/browse/HHH-9329 which makes key restricted left joins wrong.
*
* @return true if joins should be rewritten to subquery joins, false otherwise
*/
public boolean needsJoinSubqueryRewrite();
/**
* The JPQL expression to use for the given literal boolean value.
* This expression is used in contexts where an expression is assumed.
*
* @param value The boolean value
* @return The JPQL expression to use to reflect the boolean value
*/
public String getBooleanExpression(boolean value);
/**
* The JPQL conditional expression to use for the given literal boolean value.
* This expression is used in contexts where a predicate is assumed.
*
* @param value The boolean value
* @return The JPQL conditional expression to use to reflect the boolean value
*/
public String getBooleanConditionalExpression(boolean value);
/**
* The JPQL expression to use for the NULL literal.
*
* @return The JPQL expression to use to reflect the NULL value
*/
public String getNullExpression();
/**
* The name of the clause that has the same semantics as the ON clause which was introduced in JPA 2.1.
*
* @return The name of the ON clause
*/
public String getOnClause();
/**
* Normally returns VALUE, but since Hibernate does weird things when using that, it returns null.
* Returning null results in omitting VALUE in the final query that is passed to the JPA provider.
*
* @return The value function
*/
public String getCollectionValueFunction();
/**
* Whether dereferencing a VALUE function expression is supported by the JPA provider.
*
* @return True if dereferencing is supported, false otherwise
*/
public boolean supportsCollectionValueDereference();
/**
* The default result type of a scalar query.
*
* @return The default result type
*/
public Class getDefaultQueryResultType();
/**
* Returns the start of a JPQL representation of a function invocation for the given function name and argument count.
* Normally this returns FUNCTION('functionName', but implementations may also allow to render the function name directly.
*
* @param functionName The function name
* @param argumentCount The number of the arguments that the function is invoked with
* @return The start of the JPQL represenation for the function invocation
*/
public String getCustomFunctionInvocation(String functionName, int argumentCount);
/**
* The given escape character for a LIKE predicate as string.
*
* @param character The escape character
* @return The string representation
*/
public String escapeCharacter(char character);
/**
* Whether the query language supports the null precedence clause.
*
* @return True if the null precedence clause is supported, false otherwise
*/
public boolean supportsNullPrecedenceExpression();
/**
* Renders the null precedence into the given string builder.
*
* @param sb The builder to which the null precedence should be appended to
* @param expression The order by expression which might be a select alias
* @param resolvedExpression The resolved expression for a possible select alias or the expression
* @param order The order as string (ASC or DESC)
* @param nulls The null precedence as string (NULLS FIRST or NULLS LAST)
*/
public void renderNullPrecedence(StringBuilder sb, String expression, String resolvedExpression, String order, String nulls);
/**
* Whether treating a from/root alias is supported.
* For example SELECT TREAT(alias AS Subtype).property FROM ..
*
* @return True if treating a from alias is supported, false otherwise
*/
public boolean supportsRootTreat();
/**
* Whether a treat join is supported.
* For example SELECT ... FROM .. JOIN TREAT(alias.relation AS Subtype)
*
* @return True if a treat join is supported, false otherwise
*/
public boolean supportsTreatJoin();
/**
* Whether a correlation path with a treat expression is supported.
* For example SELECT (SELECT .. FROM TREAT(parent AS Subtype).relation) FROM ..
*
* @return True if a treat in correlation expressions is supported, false otherwise
*/
public boolean supportsTreatCorrelation();
/**
* Whether a root treat in a join is supported.
* For example SELECT ... FROM .. JOIN TREAT(alias AS Subtype).relation
*
* @return True if a root treat in a join is supported, false otherwise
*/
public boolean supportsRootTreatJoin();
/**
* Whether a root treat in a treat join is supported.
* For example SELECT ... FROM .. JOIN TREAT(TREAT(alias AS Subtype).relation AS Subtype)
*
* @return True if a root treat in a treat join is supported, false otherwise
*/
public boolean supportsRootTreatTreatJoin();
/**
* Whether properties accessed of a from node are implicitly resolved to properties of a subtype of the from node.
*
* @return True if subtype property resolving is supported, false otherwise
*/
public boolean supportsSubtypePropertyResolving();
/**
* Whether relations of a from node in joins are implicitly resolved to the relations of a subtype of the from node.
*
* @return True if subtype relation resolving is supported, false otherwise
*/
public boolean supportsSubtypeRelationResolving();
/**
* Whether the COUNT(*) syntax is supported.
*
* @return True if COUNT(*) syntax is supported, false otherwise
*/
public boolean supportsCountStar();
/**
* Whether the custom functions are supported.
*
* @return True if custom functions are supported, false otherwise
* @since 1.4.0
*/
public boolean supportsCustomFunctions();
/**
* Whether the non scalar subqueries are supported.
*
* @return True if non scalar subqueries are supported, false otherwise
* @since 1.4.1
*/
public boolean supportsNonScalarSubquery();
/**
* Whether the subqueries in functions are supported.
*
* @return True if subqueries in functions are supported, false otherwise
* @since 1.4.1
*/
public boolean supportsSubqueryInFunction();
/**
* Whether the subqueries alias shadowing is supported.
*
* @return True if subqueries alias shadowing is supported, false otherwise
* @since 1.4.1
*/
public boolean supportsSubqueryAliasShadowing();
/**
* Returns an array with the column name of the discriminator of the given entity type and the discriminator value, or null.
*
* @param entityType The entity type
* @return The column name of the discriminator and the discriminator value, or null
* @since 1.3.0
*/
public String[] getDiscriminatorColumnCheck(EntityType entityType);
/**
* Whether the join columns for the given attribute are in a foreign table.
*
* @param ownerType The owner of the attribute
* @param attributeName The attribute name to check
* @return True if join columns are in a foreign table, false otherwise
*/
public boolean isForeignJoinColumn(EntityType ownerType, String attributeName);
/**
* Whether columns for the given attribute are shared between multiple subtypes
* or shared by occupying the same slot in the resulting SQL.
*
* @param ownerType The owner of the attribute
* @param attributeName The attribute name to check
* @return True if columns of the attribute are shared, false otherwise
*/
public boolean isColumnShared(EntityType ownerType, String attributeName);
/**
* Returns the column names of the attribute of the given entity type.
*
* @param ownerType The owner of the attribute
* @param attributeName The attribute name
* @return The column names of the attribute
*/
public String[] getColumnNames(EntityType ownerType, String attributeName);
/**
* Returns the column names of the attribute of the given entity type within the element collection.
*
* @param ownerType The owner of the attribute
* @param elementCollectionPath The path to the element collection within which the attribute is contained
* @param attributeName The attribute name
* @return The column names of the attribute
* @since 1.3.0
*/
public String[] getColumnNames(EntityType ownerType, String elementCollectionPath, String attributeName);
/**
* Returns the SQL column type names of the given attribute of the given entity type.
*
* @param ownerType The owner of the attribute
* @param attributeName The attribute name
* @return The SQL column type names for the attribute
*/
public String[] getColumnTypes(EntityType ownerType, String attributeName);
/**
* Returns the SQL column type names of the given attribute of the given entity type within the element collection.
*
* @param ownerType The owner of the attribute
* @param elementCollectionPath The path to the element collection within which the attribute is contained
* @param attributeName The attribute name
* @return The SQL column type names for the attribute
* @since 1.3.0
*/
public String[] getColumnTypes(EntityType ownerType, String elementCollectionPath, String attributeName);
/**
* Returns where to put treat filters for a treat joined association of this attribute.
* This is for JPA providers that don't correctly filter the types.
*
* Hibernate for example does not automatically add the type constraint to treat joins of a type that uses
* the table per class inheritance strategy.
*
* @param ownerType The declaring type of the attribute to check
* @param attributeName The attribute name for which to check the treat filter requirement or null
* @param joinType The join type used for the treat join
* @return The constraint type for the treat filter
*/
public ConstraintType requiresTreatFilter(EntityType ownerType, String attributeName, JoinType joinType);
/**
* If the given attribute is an inverse collection, the mapped by attribute name is returned.
* Otherwise returns null.
*
* @param ownerType The declaring type of the attribute to check
* @param attributeName The name of the inverse attribute for which to retrieve the mapped by value
* @return The mapped by attribute name if the given attribute is an inverse collection, null otherwise
*/
public String getMappedBy(EntityType ownerType, String attributeName);
/**
* If the given attribute is insertable = false and updatable = false it returns the writable mappings for the inverse type.
* Otherwise returns null.
*
* @param inverseType The type containing the inverse relation
* @param ownerType The declaring type of the attribute to check
* @param attributeName The name of the attribute for which to retrieve the writable mapped by mapping
* @param inverseAttribute The name of the inverse attribute for which to retrieve the writable mapped by mapping
* @return The writable mappings for the inverse type if the attribute is not insertable or updatable, null otherwise
*/
public Map getWritableMappedByMappings(EntityType inverseType, EntityType ownerType, String attributeName, String inverseAttribute);
/**
* If the given attribute is a collection that uses a join table, returns it's descriptor.
* Otherwise returns null.
*
* @param ownerType The declaring type of the attribute to check
* @param attributeName The name of the attribute for which to retrieve the join table name
* @return The join table information if the attribute has one, null otherwise
*/
public JoinTable getJoinTable(EntityType ownerType, String attributeName);
/**
* Whether the given attribute is a non-indexed and non-ordered collection a.k.a. a bag.
*
* @param ownerType The declaring type of the attribute to check
* @param attributeName The name of the attribute to check
* @return True if it is a bag, false otherwise
*/
public boolean isBag(EntityType ownerType, String attributeName);
/**
* Whether orphan removal is activated for the given attribute.
*
* @param ownerType The declaring type of the attribute to check
* @param attributeName The name of the attribute to check
* @return True if orphan removal is activated, else false
*/
public boolean isOrphanRemoval(ManagedType ownerType, String attributeName);
/**
* Whether orphan removal is activated for the given attribute within the element collection.
*
* @param ownerType The declaring type of the attribute to check
* @param elementCollectionPath The path to the element collection within which the attribute is contained
* @param attributeName The name of the attribute to check
* @return True if orphan removal is activated, else false
* @since 1.3.0
*/
public boolean isOrphanRemoval(ManagedType ownerType, String elementCollectionPath, String attributeName);
/**
* Whether delete cascading is activated for the given attribute.
*
* @param ownerType The declaring type of the attribute to check
* @param attributeName The name of the attribute to check
* @return True if delete cascading is activated, else false
*/
public boolean isDeleteCascaded(ManagedType ownerType, String attributeName);
/**
* Whether delete cascading is activated for the given attribute within the element collection.
*
* @param ownerType The declaring type of the attribute to check
* @param elementCollectionPath The path to the element collection within which the attribute is contained
* @param attributeName The name of the attribute to check
* @return True if delete cascading is activated, else false
* @since 1.3.0
*/
public boolean isDeleteCascaded(ManagedType ownerType, String elementCollectionPath, String attributeName);
/**
* Whether the given attribute has a join condition.
*
* @param ownerType The declaring type of the attribute to check
* @param elementCollectionPath The nullable path to the element collection within which the attribute is contained
* @param attributeName The name of the attribute to check
* @return True if it has a join condition, else false
*/
public boolean hasJoinCondition(ManagedType ownerType, String elementCollectionPath, String attributeName);
/**
* Returns whether the entity with the id is contained in the entity managers persistence context.
*
* @param em The entity manager
* @param entityClass The entity class
* @param id The entity id
* @return True if it is contained, false otherwise
*/
public boolean containsEntity(EntityManager em, Class entityClass, Object id);
/**
* Indicates if the provider supports expressions like
*
* doc.owner.id
*
* without generating an extra join.
*
* @return true if supported, else false
*/
public boolean supportsSingleValuedAssociationIdExpressions();
/**
* Indicates if the provider supports the use of foreign associations in the ON clause.
* This is the case when implicit joins in the ON clause are specially treated regarding SQL rendering.
* If an expression like alias.association.property results in a subquery or table group join
* when used in the ON clause, the JPA provider supports this feature. Normally this silently fails with invalid SQL.
* By returning false, subqueries will be generated for such associations instead.
*
* The value is not yet used but will be in a future version. Also see: https://github.com/Blazebit/blaze-persistence/issues/402
*
* @return true if supported, else false
*/
public boolean supportsForeignAssociationInOnClause();
/**
* Indicates whether an embeddable can be set via an update queries SET clause.
* Although the JPA spec mandates this, it doesn't seem to be asserted so some providers don't support it.
*
* @return true if supported, else false
*/
public boolean supportsUpdateSetEmbeddable();
/**
* Indicates whether an association id can be set via an update queries SET clause or if the association has to be set as a whole.
*
* @return true if supported, else false
* @since 1.5.0
*/
public boolean supportsUpdateSetAssociationId();
/**
* Indicates if the provider supports the use of transient entity objects as parameters.
*
* @return true if supported, else false
*/
public boolean supportsTransientEntityAsParameter();
/**
* Indicates if the provider needs associations in the ON clause to use their id.
* If needed, an expression like alias.association in the ON clause is rewritten to
* alias.association.id.
*
* @return true if required, else false
*/
public boolean needsAssociationToIdRewriteInOnClause();
/**
* Indicates if the provider needs associations in the ON clause to use their id.
* If needed, an expression like alias.association in the ON clause is rewritten to
* alias.association.id which relies on a broken type check in older Hibernate versions.
*
* @return true if required, else false
*/
public boolean needsBrokenAssociationToIdRewriteInOnClause();
/**
* Indicates if the provider does column sharing for same named columns in inheritance mappings
* and thus requires the use of a CASE WHEN expression for restricting casted accesses like e.g. TREAT(alias AS Subtype).property
* to retain cast semantics.
*
* @return true if required, else false
*/
public boolean needsTypeConstraintForColumnSharing();
/**
* Indicates whether the provider clears collection table entries on bulk delete operations.
*
* @return true if supported, else false
*/
public boolean supportsCollectionTableCleanupOnDelete();
/**
* Indicates whether the provider clears join table entries on bulk delete operations.
*
* @return true if supported, else false
*/
public boolean supportsJoinTableCleanupOnDelete();
/**
* Indicates whether the provider supports correlating inverse associations.
*
* @return true if needed, else false
* @since 1.3.0
*/
public boolean needsCorrelationPredicateWhenCorrelatingWithWhereClause();
/**
* Indicates whether the provider supports optimized natural id access.
*
* @return true if supported, else false
* @since 1.3.0
*/
public boolean supportsSingleValuedAssociationNaturalIdExpressions();
/**
* Indicates whether the provider supports group by entity alias properly.
*
* @return true if supported, else false
* @since 1.3.0
*/
public boolean supportsGroupByEntityAlias();
/**
* Indicates whether the provider needs to cutoff id properties when used as subpath of element collections.
* This is to be able to workaround https://hibernate.atlassian.net/browse/HHH-13045 .
*
* @return true if needed, else false
* @since 1.3.0
*/
public boolean needsElementCollectionIdCutoff();
/**
* Indicates whether the provider requires an unproxied entity for field access to work.
*
* @return true if needed, else false
* @since 1.4.1
*/
public boolean needsUnproxyForFieldAccess();
/**
* Enables query result caching for the given query.
*
* @param query Enables query result caching for the query
* @since 1.2.0
*/
public void setCacheable(Query query);
/**
* Get the identifier or unique key inverse properties of an association attribute.
*
* @param owner The owning entity type
* @param attributeName The association attribute
* @return the identifier or unique key inverse properties of the association attribute
* @since 1.2.1
* @deprecated Use {@link #getJoinMappingPropertyNames(EntityType, String, String)} instead
*/
public List getIdentifierOrUniqueKeyEmbeddedPropertyNames(EntityType owner, String attributeName);
/**
* Get the identifier or unique key inverse properties of an association attribute within an element collection.
*
* @param owner The owning entity type
* @param elementCollectionPath The path to the element collection within which the attribute is contained
* @param attributeName The association attribute
* @return the identifier or unique key inverse properties of the association attribute
* @since 1.3.0
* @deprecated Use {@link #getJoinMappingPropertyNames(EntityType, String, String)} instead
*/
public List getIdentifierOrUniqueKeyEmbeddedPropertyNames(EntityType owner, String elementCollectionPath, String attributeName);
/**
* Returns the join mapping property names of an association attribute. This is a mapping from target to source property names.
*
* @param owner The owning entity type
* @param elementCollectionPath The nullable path to the element collection within which the attribute is contained
* @param attributeName The association attribute
* @return the property names from target type to the source type
* @since 1.4.0
*/
public Map getJoinMappingPropertyNames(EntityType owner, String elementCollectionPath, String attributeName);
/**
* Whether the enum type of the given attribute supports being used as literal by it's FQN.
*
* @param ownerType The declaring type of the attribute to check
* @param attributeName The name of the attribute to check
* @param key Whether the key part of a map attribute should be checked or the attribute element type
* @return true if supported, false otherwise
* @since 1.5.0
*/
public boolean supportsEnumLiteral(ManagedType ownerType, String attributeName, boolean key);
/**
* Whether the JPA provider supports the temporal literal.
*
* @return true if supported, false otherwise
* @since 1.5.0
*/
public boolean supportsTemporalLiteral();
/**
* Returns the identifier of the entity object.
*
* @param entity The entity
* @return the primary identifier of the entity
* @since 1.3.0
*/
public Object getIdentifier(Object entity);
/**
* Returns the unproxied i.e. the real entity object.
*
* @param entity The entity, maybe a proxy
* @param The entity type
* @return the real entity object
* @since 1.3.0
*/
public T unproxy(T entity);
/**
* Returns the JpaMetamodelAccessor for this JPA vendor.
* @return the JpaMetamodelAccessor for this JPA vendor
* @since 1.3.0
*/
public JpaMetamodelAccessor getJpaMetamodelAccessor();
/**
* The possible locations of a constraint.
*
* @author Christian Beikov
*/
public static enum ConstraintType {
/**
* No constraint.
*/
NONE,
/**
* Constraint in the ON clause.
*/
ON,
/**
* Constraint in the WHERE clause.
*/
WHERE;
}
}
