Class InheritancePolicy

  • All Implemented Interfaces:
    Serializable, Cloneable

    public class InheritancePolicy
    extends CoreInheritancePolicy<org.eclipse.persistence.internal.sessions.AbstractRecord,​org.eclipse.persistence.internal.sessions.AbstractSession,​ClassDescriptor,​org.eclipse.persistence.internal.helper.DatabaseField>
    implements Serializable, Cloneable

    Purpose: Allows customization of an object's inheritance. The primary supported inheritance model uses a class type indicator column in the table that stores the object's class type. The class-to-type mapping is specified on this policy. The full class name can also be used for the indicator instead of the mapping.

    Each subclass can either share their parents table, or in addition add their own table(s).

    For legacy models a customized inheritance class-extractor can be provided. This allows Java code to be used to compute the class type to use for a row. When this customized inheritance model is used an only-instances and with-all-subclasses filter expression may be required for concrete and branch querying.

    See Also:
    Serialized Form
    • Field Detail

      • parentClass

        protected Class parentClass
      • parentClassName

        protected String parentClassName
      • classIndicatorField

        protected org.eclipse.persistence.internal.helper.DatabaseField classIndicatorField
      • classIndicatorMapping

        protected transient Map classIndicatorMapping
      • classNameIndicatorMapping

        protected Map classNameIndicatorMapping
      • shouldUseClassNameAsIndicator

        protected transient boolean shouldUseClassNameAsIndicator
      • shouldReadSubclasses

        protected transient Boolean shouldReadSubclasses
      • readAllSubclassesView

        protected org.eclipse.persistence.internal.helper.DatabaseTable readAllSubclassesView
      • allChildClassIndicators

        protected transient List<Object> allChildClassIndicators
      • onlyInstancesExpression

        protected transient Expression onlyInstancesExpression
      • withAllSubclassesExpression

        protected transient Expression withAllSubclassesExpression
      • allTables

        protected transient Vector allTables
      • childrenTables

        protected transient List<org.eclipse.persistence.internal.helper.DatabaseTable> childrenTables
      • childrenTablesJoinExpressions

        protected transient Map<org.eclipse.persistence.internal.helper.DatabaseTable,​Expression> childrenTablesJoinExpressions
      • childrenJoinExpression

        protected transient Expression childrenJoinExpression
      • classExtractorName

        protected String classExtractorName
        Allow for class extraction method to be specified.
      • shouldAlwaysUseOuterJoin

        protected boolean shouldAlwaysUseOuterJoin
      • useDescriptorsToValidateInheritedObjects

        protected boolean useDescriptorsToValidateInheritedObjects
      • shouldOuterJoinSubclasses

        protected boolean shouldOuterJoinSubclasses
        Define if an outer join should be used to read subclasses.
      • isJoinedStrategy

        protected boolean isJoinedStrategy
      • rootParentDescriptor

        protected ClassDescriptor rootParentDescriptor
        PERF: Cache root descriptor.
      • describesNonPersistentSubclasses

        protected boolean describesNonPersistentSubclasses
    • Constructor Detail

      • InheritancePolicy

        public InheritancePolicy()
        INTERNAL: Create a new policy. Only descriptors involved in inheritance should have a policy.
      • InheritancePolicy

        public InheritancePolicy​(ClassDescriptor descriptor)
        INTERNAL: Create a new policy. Only descriptors involved in inheritance should have a policy.
    • Method Detail

      • addChildDescriptor

        public void addChildDescriptor​(ClassDescriptor childDescriptor)
        INTERNAL: Add child descriptor to the parent descriptor.
      • addChildTableJoinExpression

        protected void addChildTableJoinExpression​(org.eclipse.persistence.internal.helper.DatabaseTable table,
                                                   Expression expression)
        INTERNAL: childrenTablesJoinExpressions, childrenTables, allTables and childrenJoinExpression are created simultaneously and kept in sync.
      • addChildTableJoinExpressionToAllParents

        public void addChildTableJoinExpressionToAllParents​(org.eclipse.persistence.internal.helper.DatabaseTable table,
                                                            Expression expression)
        INTERNAL: call addChildTableJoinExpression on all parents
      • addClassIndicator

        public void addClassIndicator​(Class childClass,
                                      Object typeValue)
        PUBLIC: Add a class indicator for the root classes subclass. The indicator is used to determine the class to use for a row read from the database, and to query only instances of a class from the database. Every concrete persistent subclass must have a single unique indicator defined for it. If the root class is concrete then it must also define an indicator. Only the root class's descriptor of the entire inheritance hierarchy can define the class indicator mapping.
      • addClassNameIndicator

        public void addClassNameIndicator​(String childClassName,
                                          Object typeValue)
        INTERNAL: Add the class name reference by class name, used by the MW.
        Specified by:
        addClassNameIndicator in class CoreInheritancePolicy<org.eclipse.persistence.internal.sessions.AbstractRecord,​org.eclipse.persistence.internal.sessions.AbstractSession,​ClassDescriptor,​org.eclipse.persistence.internal.helper.DatabaseField>
      • addClassIndicatorFieldToInsertRow

        public void addClassIndicatorFieldToInsertRow​(org.eclipse.persistence.internal.sessions.AbstractRecord databaseRow)
        INTERNAL: Add abstract class indicator information to the database row. This is required when building a row for an insert or an update of a concrete child descriptor. This is only used to build a template row.
      • addClassIndicatorFieldToRow

        public void addClassIndicatorFieldToRow​(org.eclipse.persistence.internal.sessions.AbstractRecord databaseRow)
        INTERNAL: Add abstract class indicator information to the database row. This is required when building a row for an insert or an update of a concrete child descriptor.
        Specified by:
        addClassIndicatorFieldToRow in class CoreInheritancePolicy<org.eclipse.persistence.internal.sessions.AbstractRecord,​org.eclipse.persistence.internal.sessions.AbstractSession,​ClassDescriptor,​org.eclipse.persistence.internal.helper.DatabaseField>
      • addClassIndicatorTypeToParent

        protected void addClassIndicatorTypeToParent​(Object indicator)
        INTERNAL: Post initialize the child descriptors
      • addFieldsToParent

        protected void addFieldsToParent​(Vector fields)
        INTERNAL: Recursively adds fields to all the parents
      • buildClassIndicatorSelectStatement

        public org.eclipse.persistence.internal.expressions.SQLSelectStatement buildClassIndicatorSelectStatement​(ObjectLevelReadQuery query)
        INTERNAL: Return a select statement that will be used to query the class indicators required to query. This is used in the abstract-multiple read.
      • appendWithAllSubclassesExpression

        public void appendWithAllSubclassesExpression​(org.eclipse.persistence.internal.expressions.SQLSelectStatement selectStatement)
        INTERNAL: Append the branch with all subclasses expression to the statement.
      • buildViewSelectStatement

        public org.eclipse.persistence.internal.expressions.SQLSelectStatement buildViewSelectStatement​(ObjectLevelReadQuery query)
        INTERNAL: Build a select statement for all subclasses on the view using the same selection criteria as the query.
      • classFromRow

        public Class classFromRow​(org.eclipse.persistence.internal.sessions.AbstractRecord rowFromDatabase,
                                  org.eclipse.persistence.internal.sessions.AbstractSession session)
                           throws DescriptorException
        INTERNAL: This method is invoked only for the abstract descriptors.
        Specified by:
        classFromRow in class CoreInheritancePolicy<org.eclipse.persistence.internal.sessions.AbstractRecord,​org.eclipse.persistence.internal.sessions.AbstractSession,​ClassDescriptor,​org.eclipse.persistence.internal.helper.DatabaseField>
        Throws:
        DescriptorException
      • classFromValue

        public Class classFromValue​(Object classFieldValue,
                                    org.eclipse.persistence.internal.sessions.AbstractSession session)
                             throws DescriptorException
        INTERNAL: This method is used to turn the a raw database field value classFieldValue into a Class object. Used to determine which class objects to build from database results, and for class type expression
        Throws:
        DescriptorException
      • clone

        public Object clone()
        INTERNAL: Clone the policy
        Overrides:
        clone in class Object
      • convertClassNamesToClasses

        public void convertClassNamesToClasses​(ClassLoader classLoader)
        INTERNAL: Convert all the class-name-based settings in this InheritancePolicy to actual class-based settings. This method is used when converting a project that has been built with class names to a project with classes. It will also convert referenced classes to the versions of the classes from the classLoader.
      • convertClassNameToClass

        protected <T> Class<T> convertClassNameToClass​(String className,
                                                       ClassLoader classLoader)
        INTERNAL: Convert the given className to an actual class.
      • dontReadSubclassesOnQueries

        public void dontReadSubclassesOnQueries()
        PUBLIC: Set the descriptor to only read instance of itself when queried. This is used with inheritance to configure the result of queries. By default this is true for root inheritance descriptors, and false for all others.
      • dontUseClassNameAsIndicator

        public void dontUseClassNameAsIndicator()
        PUBLIC: Set the descriptor not to use the class' full name as the indicator. The class indicator is used with inheritance to determine the class from a row. By default a class indicator mapping is required, this can be set to true if usage of the class name is desired. The field must be of a large enough size to store the fully qualified class name.
      • getAllChildClassIndicators

        protected List<Object> getAllChildClassIndicators()
        INTERNAL: Stores class indicators for all child and children's children. Used for queries on branch classes only.
      • getAllChildDescriptors

        public List<ClassDescriptor> getAllChildDescriptors()
        INTERNAL: Returns all the child descriptors, even descriptors for subclasses of subclasses. Required for bug 3019934.
        Specified by:
        getAllChildDescriptors in class CoreInheritancePolicy<org.eclipse.persistence.internal.sessions.AbstractRecord,​org.eclipse.persistence.internal.sessions.AbstractSession,​ClassDescriptor,​org.eclipse.persistence.internal.helper.DatabaseField>
      • getChildrenTables

        public List<org.eclipse.persistence.internal.helper.DatabaseTable> getChildrenTables()
        INTERNAL: if reads subclasses, all tables for all read subclasses (indirect included).
      • getChildrenTablesJoinExpressions

        public Map<org.eclipse.persistence.internal.helper.DatabaseTable,​Expression> getChildrenTablesJoinExpressions()
        INTERNAL: join expression for each child table, keyed by the table
      • getChildrenJoinExpression

        public Expression getChildrenJoinExpression()
        INTERNAL: all expressions from childrenTablesJoinExpressions ANDed together
      • getAllTables

        public Vector getAllTables()
        INTERNAL: all tables for reference class plus childrenTables
      • getChildDescriptors

        public List<ClassDescriptor> getChildDescriptors()
        INTERNAL: Return all the immediate child descriptors. Only descriptors from direct subclasses are returned.
      • getClassExtractionMethod

        protected Method getClassExtractionMethod()
        INTERNAL: Return all the classExtractionMethod
      • getClassExtractionMethodName

        public String getClassExtractionMethodName()
        ADVANCED: A class extraction method can be registered with the descriptor to override the default inheritance mechanism. This allows for a user defined class indicator in place of providing an explicit class indicator field. The method registered must be a static method on the class which has that descriptor. The method must take a Record as an argument (for example, a DatabaseRecord), and must return the class to use for that record. This method will be used to decide which class to instantiate when reading from the database. It is the application's responsibility to populate any typing information in the database required to determine the class from the record. If this method is used, then the class indicator field and mapping cannot be used, and in addition, the descriptor's withAllSubclasses and onlyInstances expressions must also be setup correctly.
        See Also:
        setWithAllSubclassesExpression(Expression), setOnlyInstancesExpression(Expression)
      • getClassExtractor

        public ClassExtractor getClassExtractor()
        ADVANCED: A class extractor can be registered with the descriptor to override the default inheritance mechanism. This allows for a user defined class indicator in place of providing an explicit class indicator field. The instance registered must extend the ClassExtractor class and implement the extractClass(Map) method. The method must take database row (a Record/Map) as an argument and must return the class to use for that row. This method will be used to decide which class to instantiate when reading from the database. It is the application's responsibility to populate any typing information in the database required to determine the class from the row, such as usage of a direct or transformation mapping for the type fields. If this method is used then the class indicator field and mapping cannot be used, and in addition, the descriptor's withAllSubclasses and onlyInstances expressions must also be setup correctly.
        See Also:
        setWithAllSubclassesExpression(Expression), setOnlyInstancesExpression(Expression)
      • setClassExtractor

        public void setClassExtractor​(ClassExtractor classExtractor)
        ADVANCED: A class extractor can be registered with the descriptor to override the default inheritance mechanism. This allows for a user defined class indicator in place of providing an explicit class indicator field. The instance registered must extend the ClassExtractor class and implement the extractClass(Map) method. The method must take database row (a Record/Map) as an argument and must return the class to use for that row. This method will be used to decide which class to instantiate when reading from the database. It is the application's responsibility to populate any typing information in the database required to determine the class from the row, such as usage of a direct or transformation mapping for the type fields. If this method is used then the class indicator field and mapping cannot be used, and in addition, the descriptor's withAllSubclasses and onlyInstances expressions must also be setup correctly.
        See Also:
        setWithAllSubclassesExpression(Expression), setOnlyInstancesExpression(Expression)
      • getClassIndicatorAssociations

        public Vector getClassIndicatorAssociations()
        INTERNAL: Return the class indicator associations for XML. List of class-name/value associations.
      • getClassIndicatorField

        public org.eclipse.persistence.internal.helper.DatabaseField getClassIndicatorField()
        INTERNAL: Returns field that the class type indicator is store when using inheritance.
        Specified by:
        getClassIndicatorField in class CoreInheritancePolicy<org.eclipse.persistence.internal.sessions.AbstractRecord,​org.eclipse.persistence.internal.sessions.AbstractSession,​ClassDescriptor,​org.eclipse.persistence.internal.helper.DatabaseField>
      • getClassIndicatorFieldName

        public String getClassIndicatorFieldName()
        PUBLIC: Return the class indicator field name. This is the name of the field in the table that stores what type of object this is.
        Specified by:
        getClassIndicatorFieldName in class CoreInheritancePolicy<org.eclipse.persistence.internal.sessions.AbstractRecord,​org.eclipse.persistence.internal.sessions.AbstractSession,​ClassDescriptor,​org.eclipse.persistence.internal.helper.DatabaseField>
      • getClassIndicatorMapping

        public Map getClassIndicatorMapping()
        INTERNAL: Return the association of indicators and classes using specified ConversionManager
        Specified by:
        getClassIndicatorMapping in class CoreInheritancePolicy<org.eclipse.persistence.internal.sessions.AbstractRecord,​org.eclipse.persistence.internal.sessions.AbstractSession,​ClassDescriptor,​org.eclipse.persistence.internal.helper.DatabaseField>
      • getClassNameIndicatorMapping

        public Map getClassNameIndicatorMapping()
        INTERNAL: Return the mapping from class name to indicator, used by MW.
        Specified by:
        getClassNameIndicatorMapping in class CoreInheritancePolicy<org.eclipse.persistence.internal.sessions.AbstractRecord,​org.eclipse.persistence.internal.sessions.AbstractSession,​ClassDescriptor,​org.eclipse.persistence.internal.helper.DatabaseField>
      • getClassIndicatorValue

        protected Object getClassIndicatorValue()
        INTERNAL: Returns value of the abstract class indicator for the Java class.
      • getClassIndicatorValue

        protected Object getClassIndicatorValue​(Class javaClass)
        INTERNAL: Returns the indicator field value for the given class If no abstract indicator mapping is specified, use the class name.
      • getDescriptor

        public ClassDescriptor getDescriptor()
        INTERNAL: Returns the descriptor which the policy belongs to.
        Specified by:
        getDescriptor in class CoreInheritancePolicy<org.eclipse.persistence.internal.sessions.AbstractRecord,​org.eclipse.persistence.internal.sessions.AbstractSession,​ClassDescriptor,​org.eclipse.persistence.internal.helper.DatabaseField>
      • getDescribesNonPersistentSubclasses

        public boolean getDescribesNonPersistentSubclasses()
        ADVANCED: Determines whether the descriptors using this inheritance policy should be used as descriptors for subclasses of the classes they describe if those subclasses do not have their own descriptor e.g. If Employee.class has a descriptor and EmployeeSubClass does not have a descriptor, if describesNonPersistenceSubclasses is true Employee's descriptor will be used as the descriptor for Employee
      • getOnlyInstancesExpression

        public Expression getOnlyInstancesExpression()
        ADVANCED: Return the 'only instances expression'.
      • getParentClass

        public Class getParentClass()
        PUBLIC: Return the parent class.
        Specified by:
        getParentClass in class CoreInheritancePolicy<org.eclipse.persistence.internal.sessions.AbstractRecord,​org.eclipse.persistence.internal.sessions.AbstractSession,​ClassDescriptor,​org.eclipse.persistence.internal.helper.DatabaseField>
      • getParentClassName

        public String getParentClassName()
        INTERNAL: Return the parent class name.
      • getParentDescriptor

        public ClassDescriptor getParentDescriptor()
        INTERNAL: Return the parent descriptor.
        Specified by:
        getParentDescriptor in class CoreInheritancePolicy<org.eclipse.persistence.internal.sessions.AbstractRecord,​org.eclipse.persistence.internal.sessions.AbstractSession,​ClassDescriptor,​org.eclipse.persistence.internal.helper.DatabaseField>
      • getReadAllSubclassesView

        public org.eclipse.persistence.internal.helper.DatabaseTable getReadAllSubclassesView()
        INTERNAL: The view can be used to optimize/customize the query for all subclasses where they have multiple tables. This view can do the outer join, we require the view because we cannot generate dynamic platform independent SQL for outer joins (i.e. not possible to do so either).
      • getReadAllSubclassesViewName

        public String getReadAllSubclassesViewName()
        ADVANCED: The view can be used to optimize/customize the query for all subclasses where they have multiple tables. This view can use outer joins or unions to combine the results of selecting from all of the subclass tables. If a view is not given then TopLink must make an individual call for each subclass.
      • getRootParentDescriptor

        public ClassDescriptor getRootParentDescriptor()
        INTERNAL: Return the root parent descriptor
      • getSubclassDescriptor

        public ClassDescriptor getSubclassDescriptor​(Class theClass)
        INTERNAL: use aggregate in inheritance
      • getDescriptor

        public ClassDescriptor getDescriptor​(Class theClass)
        INTERNAL: Returns descriptor corresponding to the class owning the policy or its subclass - otherwise null.
      • getUseDescriptorsToValidateInheritedObjects

        public boolean getUseDescriptorsToValidateInheritedObjects()
        INTERNAL: return if we should use the descriptor inheritance to determine if an object can be returned from the identity map or not.
      • getWithAllSubclassesExpression

        public Expression getWithAllSubclassesExpression()
        ADVANCED: Return the Expression which gets all subclasses.
      • hasChildren

        public boolean hasChildren()
        INTERNAL: Check if descriptor has children
      • hasClassExtractor

        public boolean hasClassExtractor()
        INTERNAL:
        Specified by:
        hasClassExtractor in class CoreInheritancePolicy<org.eclipse.persistence.internal.sessions.AbstractRecord,​org.eclipse.persistence.internal.sessions.AbstractSession,​ClassDescriptor,​org.eclipse.persistence.internal.helper.DatabaseField>
      • hasClassIndicator

        public boolean hasClassIndicator()
        INTERNAL: Checks if the class is involved in inheritance
      • hasMultipleTableChild

        public boolean hasMultipleTableChild()
        INTERNAL: Return if any children of this descriptor require information from another table not specified at the parent level.
      • hasView

        public boolean hasView()
        INTERNAL: Return if a view is used for inheritance reads.
      • initialize

        public void initialize​(org.eclipse.persistence.internal.sessions.AbstractSession session)
        INTERNAL: Initialize the inheritance properties of the descriptor once the mappings are initialized. This is done before formal postInitialize during the end of mapping initialize.
      • initializeClassExtractor

        protected void initializeClassExtractor​(org.eclipse.persistence.internal.sessions.AbstractSession session)
                                         throws DescriptorException
        INTERNAL: Setup the default classExtractionMethod, or if one was specified by the user make sure it is valid.
        Throws:
        DescriptorException
      • initializeOnlyInstancesExpression

        protected void initializeOnlyInstancesExpression()
                                                  throws DescriptorException
        INTERNAL: Initialize the expression to use to check the specific type field.
        Throws:
        DescriptorException
      • initializeOptimisticLocking

        protected void initializeOptimisticLocking()
        INTERNAL: Potentially override the optimistic locking behavior
      • initializeCacheInvalidationPolicy

        protected void initializeCacheInvalidationPolicy()
        INTERNAL: Potentially override the cache invalidation behavior
      • initializeWithAllSubclassesExpression

        protected void initializeWithAllSubclassesExpression()
                                                      throws DescriptorException
        INTERNAL: Initialize the expression to use for queries to the class and its subclasses.
        Throws:
        DescriptorException
      • isChildDescriptor

        public boolean isChildDescriptor()
        INTERNAL: Check if it is a child descriptor.
      • isJoinedStrategy

        public boolean isJoinedStrategy()
        INTERNAL: Indicate whether a single table or joined inheritance strategy is being used. Since we currently do not support TABLE_PER_CLASS, indicating either joined/not joined is sufficient.
        Returns:
        isJoinedStrategy value
      • isRootParentDescriptor

        public boolean isRootParentDescriptor()
        INTERNAL: Return whether or not is root parent descriptor
        Specified by:
        isRootParentDescriptor in class CoreInheritancePolicy<org.eclipse.persistence.internal.sessions.AbstractRecord,​org.eclipse.persistence.internal.sessions.AbstractSession,​ClassDescriptor,​org.eclipse.persistence.internal.helper.DatabaseField>
      • postInitialize

        public void postInitialize​(org.eclipse.persistence.internal.sessions.AbstractSession session)
        INTERNAL: Initialized the inheritance properties that cannot be initialized until after the mappings have been.
      • preInitialize

        public void preInitialize​(org.eclipse.persistence.internal.sessions.AbstractSession session)
                           throws DescriptorException
        INTERNAL: Allow the inheritance properties of the descriptor to be initialized. The descriptor's parent must first be initialized.
        Throws:
        DescriptorException
      • readSubclassesOnQueries

        public void readSubclassesOnQueries()
        PUBLIC: Set the descriptor to read instance of itself and its subclasses when queried. This is used with inheritance to configure the result of queries. By default this is true for root inheritance descriptors, and false for all others.
      • remoteInitialization

        public void remoteInitialization​(DistributedSession session)
        INTERNAL: Used to initialize a remote descriptor.
      • requiresMultipleTableSubclassRead

        public boolean requiresMultipleTableSubclassRead()
        INTERNAL: Return if this descriptor has children that define additional tables and needs to read them. This case requires a special read, because the query cannot be done through a single SQL call with normal joins.
      • selectAllRowUsingCustomMultipleTableSubclassRead

        protected Vector selectAllRowUsingCustomMultipleTableSubclassRead​(ObjectLevelReadQuery query)
                                                                   throws DatabaseException
        INTERNAL: Select all rows from a abstract table descriptor. This is accomplished by selecting for all of the concrete classes and then merging the rows. This does not optimize using type select, as the type information is not known.
        Returns:
        vector containing database rows.
        Throws:
        DatabaseException - - an error has occurred on the database.
      • selectAllRowUsingDefaultMultipleTableSubclassRead

        protected Vector selectAllRowUsingDefaultMultipleTableSubclassRead​(ObjectLevelReadQuery query)
                                                                    throws DatabaseException,
                                                                           QueryException
        INTERNAL: Select all rows from a abstract table descriptor. This is accomplished by selecting for all of the concrete classes and then merging the rows.
        Returns:
        vector containing database rows.
        Throws:
        DatabaseException - - an error has occurred on the database.
        QueryException
      • removeChildren

        protected void removeChildren​(ClassDescriptor descriptor,
                                      Set<Class> classes,
                                      Set<Class> subclasses)
        Remove all of the subclasses (and so on) from the set of classes.
      • selectAllRowUsingMultipleTableSubclassRead

        public Vector selectAllRowUsingMultipleTableSubclassRead​(ObjectLevelReadQuery query)
                                                          throws DatabaseException
        INTERNAL: Select all rows from a abstract table descriptor. This is accomplished by selecting for all of the concrete classes and then merging the rows.
        Returns:
        vector containing database rows.
        Throws:
        DatabaseException - - an error has occurred on the database.
      • selectOneRowUsingCustomMultipleTableSubclassRead

        protected org.eclipse.persistence.internal.sessions.AbstractRecord selectOneRowUsingCustomMultipleTableSubclassRead​(ReadObjectQuery query)
                                                                                                                     throws DatabaseException
        INTERNAL: Select one rows from a abstract table descriptor. This is accomplished by selecting for all of the concrete classes until a row is found. This does not optimize using type select, as the type information is not known.
        Throws:
        DatabaseException - - an error has occurred on the database.
      • selectOneRowUsingDefaultMultipleTableSubclassRead

        protected org.eclipse.persistence.internal.sessions.AbstractRecord selectOneRowUsingDefaultMultipleTableSubclassRead​(ReadObjectQuery query)
                                                                                                                      throws DatabaseException,
                                                                                                                             QueryException
        INTERNAL: Select one row of any concrete subclass, This must use two selects, the first retrieves the type field only.
        Throws:
        DatabaseException
        QueryException
      • setAllChildClassIndicators

        protected void setAllChildClassIndicators​(Vector allChildClassIndicators)
        INTERNAL:
      • setChildDescriptors

        public void setChildDescriptors​(List<ClassDescriptor> childDescriptors)
        INTERNAL:
      • setClassExtractionMethodName

        public void setClassExtractionMethodName​(String staticClassClassExtractionMethod)
        ADVANCED: A class extraction method can be registered with the descriptor to override the default inheritance mechanism. This allows for a user defined class indicator in place of providing an explicit class indicator field. The method registered must be a static method on the class which has that descriptor. The method must take Record as an argument (for example, a DatabaseRecord), and must return the class to use for that record. This method will be used to decide which class to instantiate when reading from the database. It is the application's responsibility to populate any typing information in the database required to determine the class from the record. If this method is used then the class indicator field and mapping cannot be used, and in addition, the descriptor's withAllSubclasses and onlyInstances expressions must also be set up correctly.
        See Also:
        setWithAllSubclassesExpression(Expression), setOnlyInstancesExpression(Expression)
      • setClassIndicatorAssociations

        public void setClassIndicatorAssociations​(Vector classIndicatorAssociations)
        INTERNAL: Set the class indicator associations from reading the deployment XML.
      • setClassIndicatorField

        public void setClassIndicatorField​(org.eclipse.persistence.internal.helper.DatabaseField classIndicatorField)
        ADVANCED: To set the class indicator field. This can be used for advanced field types, such as XML nodes, or to set the field type.
        Specified by:
        setClassIndicatorField in class CoreInheritancePolicy<org.eclipse.persistence.internal.sessions.AbstractRecord,​org.eclipse.persistence.internal.sessions.AbstractSession,​ClassDescriptor,​org.eclipse.persistence.internal.helper.DatabaseField>
      • setClassIndicatorFieldName

        public void setClassIndicatorFieldName​(String fieldName)
        PUBLIC: To set the class indicator field name. This is the name of the field in the table that stores what type of object this is.
      • setClassIndicatorMapping

        public void setClassIndicatorMapping​(Map classIndicatorMapping)
        PUBLIC: Set the association of indicators and classes. This may be desired to be used by clients in strange inheritance models.
        Specified by:
        setClassIndicatorMapping in class CoreInheritancePolicy<org.eclipse.persistence.internal.sessions.AbstractRecord,​org.eclipse.persistence.internal.sessions.AbstractSession,​ClassDescriptor,​org.eclipse.persistence.internal.helper.DatabaseField>
      • setClassNameIndicatorMapping

        public void setClassNameIndicatorMapping​(Map classNameIndicatorMapping)
        INTERNAL: Set the class name indicator mapping, used by the MW.
      • setDescriptor

        public void setDescriptor​(ClassDescriptor descriptor)
        INTERNAL: Set the descriptor.
        Specified by:
        setDescriptor in class CoreInheritancePolicy<org.eclipse.persistence.internal.sessions.AbstractRecord,​org.eclipse.persistence.internal.sessions.AbstractSession,​ClassDescriptor,​org.eclipse.persistence.internal.helper.DatabaseField>
      • setDescribesNonPersistentSubclasses

        public void setDescribesNonPersistentSubclasses​(boolean describesNonPersistentSubclasses)
        ADVANCED: Determines whether the descriptors using this inheritance policy should be used as descriptors for subclasses of the classes they describe if those subclasses do not have their own descriptor e.g. If Employee.class has a descriptor and EmployeeSubClass does not have a descriptor, if describesNonPersistenceSubclasses is true Employee's descriptor will be used as the descriptor for Employee
        Parameters:
        describesNonPersistentSubclasses -
      • setJoinedStrategy

        public void setJoinedStrategy()
        INTERNAL: Used to indicate a JOINED inheritance strategy.
      • setOnlyInstancesExpression

        public void setOnlyInstancesExpression​(Expression onlyInstancesExpression)
        ADVANCED: Sets the expression used to select instance of the class only. Can be used to customize the inheritance class indicator expression.
      • setParentClass

        public void setParentClass​(Class parentClass)
        PUBLIC: Set the parent class. A descriptor can inherit from another descriptor through defining it as its parent. The root descriptor must define a class indicator field and mapping. All children must share the same table as their parent but can add additional tables. All children must share the root descriptor primary key.
      • setParentClassName

        public void setParentClassName​(String parentClassName)
        INTERNAL: Set the parent class name, used by MW to avoid referencing the real class for deployment XML generation.
        Specified by:
        setParentClassName in class CoreInheritancePolicy<org.eclipse.persistence.internal.sessions.AbstractRecord,​org.eclipse.persistence.internal.sessions.AbstractSession,​ClassDescriptor,​org.eclipse.persistence.internal.helper.DatabaseField>
      • setParentDescriptor

        public void setParentDescriptor​(ClassDescriptor parentDescriptor)
        INTERNAL:
      • setReadAllSubclassesView

        protected void setReadAllSubclassesView​(org.eclipse.persistence.internal.helper.DatabaseTable readAllSubclassesView)
        INTERNAL: The view can be used to optimize/customize the query for all subclasses where they have multiple tables. This view can do the outer join, we require the view because we cannot generate dynamic platform independent SQL for outer joins (i.e. not possible to do so either).
      • setReadAllSubclassesViewName

        public void setReadAllSubclassesViewName​(String readAllSubclassesViewName)
        ADVANCED: The view can be used to optimize/customize the query for all subclasses where they have multiple tables. This view can use outer joins or unions to combine the results of selecting from all of the subclass tables. If a view is not given then TopLink must make an individual call for each subclass.
      • setShouldReadSubclasses

        public void setShouldReadSubclasses​(Boolean shouldReadSubclasses)
        INTERNAL: Set the descriptor to read instance of itself and its subclasses when queried. This is used with inheritance to configure the result of queries. By default this is true for root inheritance descriptors, and false for all others.
        Specified by:
        setShouldReadSubclasses in class CoreInheritancePolicy<org.eclipse.persistence.internal.sessions.AbstractRecord,​org.eclipse.persistence.internal.sessions.AbstractSession,​ClassDescriptor,​org.eclipse.persistence.internal.helper.DatabaseField>
      • setShouldReadSubclasses

        public void setShouldReadSubclasses​(boolean shouldReadSubclasses)
        PUBLIC: Set the descriptor to read instance of itself and its subclasses when queried. This is used with inheritance to configure the result of queries. By default this is true for root inheritance descriptors, and false for all others.
      • setShouldUseClassNameAsIndicator

        public void setShouldUseClassNameAsIndicator​(boolean shouldUseClassNameAsIndicator)
        PUBLIC: Set if the descriptor uses the classes fully qualified name as the indicator. The class indicator is used with inheritance to determine the class from a row. By default a class indicator mapping is required, this can be set to true if usage of the class name is desired. The field must be of a large enough size to store the fully qualified class name.
      • setAlwaysUseOuterJoinForClassType

        public void setAlwaysUseOuterJoinForClassType​(boolean choice)
        PUBLIC: Sets the inheritance policy to always use an outer join when querying across a relationship of class. used when using getAllowingNull(), or anyOfAllowingNone()
      • setSingleTableStrategy

        public void setSingleTableStrategy()
        INTERNAL: Used to indicate a SINGLE_TABLE inheritance strategy. Since only JOINED and SINGLE_TABLE strategies are supported at this time (no support for TABLE_PER_CLASS) using a !isJoinedStrategy an an indicator for SINGLE_TABLE is sufficient.
      • setUseDescriptorsToValidateInheritedObjects

        public void setUseDescriptorsToValidateInheritedObjects​(boolean useDescriptorsToValidateInheritedObjects)
        INTERNAL: Sets if we should use the descriptor inheritance to determine if an object can be returned from the identity map or not.
      • setWithAllSubclassesExpression

        public void setWithAllSubclassesExpression​(Expression withAllSubclassesExpression)
        ADVANCED: Sets the expression to be used for querying for a class and all its subclasses. Can be used to customize the inheritance class indicator expression.
      • shouldReadSubclasses

        public boolean shouldReadSubclasses()
        PUBLIC: Return true if this descriptor should read instances of itself and subclasses on queries.
      • shouldReadSubclassesValue

        public Boolean shouldReadSubclassesValue()
        INTERNAL: Return true if this descriptor should read instances of itself and subclasses on queries.
      • shouldAlwaysUseOuterJoin

        public boolean shouldAlwaysUseOuterJoin()
        PUBLIC: returns if the inheritance policy will always use an outerjoin when selecting class type
      • shouldOuterJoinSubclasses

        public boolean shouldOuterJoinSubclasses()
        PUBLIC: Return if an outer join should be used to read subclasses. By default a separate query is done for each subclass when querying for a root or branch inheritance class that has subclasses that span multiple tables.
      • setShouldOuterJoinSubclasses

        public void setShouldOuterJoinSubclasses​(boolean shouldOuterJoinSubclasses)
        PUBLIC: Set if an outer join should be used to read subclasses. By default a separate query is done for each subclass when querying for a root or branch inheritance class that has subclasses that span multiple tables.
      • shouldUseClassNameAsIndicator

        public boolean shouldUseClassNameAsIndicator()
        PUBLIC: Return true if the descriptor use the classes full name as the indicator. The class indicator is used with inheritance to determine the class from a row. By default a class indicator mapping is required, this can be set to true if usage of the class name is desired. The field must be of a large enough size to store the fully qualified class name.
      • updateTables

        protected void updateTables()
        INTERNAL: set the tables on the child descriptor overridden in org.eclipse.persistence.internal.oxm.QNameInheritancePolicy
      • useClassNameAsIndicator

        public void useClassNameAsIndicator()
        PUBLIC: Set the descriptor to use the classes full name as the indicator. The class indicator is used with inheritance to determine the class from a row. By default a class indicator mapping is required, this can be set to true if usage of the class name is desired. The field must be of a large enough size to store the fully qualified class name.