EclipseLink 1.1.4, build 'v20100812-r7860' API Reference

org.eclipse.persistence.descriptors
Class InheritancePolicy

java.lang.Object
  extended by org.eclipse.persistence.descriptors.InheritancePolicy
All Implemented Interfaces:
java.io.Serializable, java.lang.Cloneable

public class InheritancePolicy
extends java.lang.Object
implements java.io.Serializable, java.lang.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 Summary
protected  java.util.Vector allChildClassIndicators
           
protected  java.util.Vector allTables
           
protected  java.util.Vector childDescriptors
           
protected  Expression childrenJoinExpression
           
protected  java.util.List childrenTables
           
protected  java.util.Map childrenTablesJoinExpressions
           
protected  ClassExtractor classExtractor
          Allow for class extraction method to be specified.
protected  org.eclipse.persistence.internal.helper.DatabaseField classIndicatorField
           
protected  java.util.Map classIndicatorMapping
           
protected  java.util.Map classNameIndicatorMapping
           
protected  boolean describesNonPersistentSubclasses
           
protected  ClassDescriptor descriptor
           
protected  boolean hasMultipleTableChild
           
protected  boolean isJoinedStrategy
           
protected  Expression onlyInstancesExpression
           
protected  java.lang.Class parentClass
           
protected  java.lang.String parentClassName
           
protected  ClassDescriptor parentDescriptor
           
protected  org.eclipse.persistence.internal.helper.DatabaseTable readAllSubclassesView
           
protected  ClassDescriptor rootParentDescriptor
          PERF: Cache root descriptor.
protected  boolean shouldAlwaysUseOuterJoin
           
protected  boolean shouldOuterJoinSubclasses
          Define if an outer join should be used to read subclasses.
protected  java.lang.Boolean shouldReadSubclasses
           
protected  boolean shouldUseClassNameAsIndicator
           
protected  boolean useDescriptorsToValidateInheritedObjects
           
protected  Expression withAllSubclassesExpression
           
 
Constructor Summary
InheritancePolicy()
          INTERNAL: Create a new policy.
InheritancePolicy(ClassDescriptor descriptor)
          INTERNAL: Create a new policy.
 
Method Summary
 void addChildDescriptor(ClassDescriptor childDescriptor)
          INTERNAL: Add child descriptor to the parent descriptor.
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.
 void addChildTableJoinExpressionToAllParents(org.eclipse.persistence.internal.helper.DatabaseTable table, Expression expression)
          INTERNAL: call addChildTableJoinExpression on all parents
 void addClassIndicator(java.lang.Class childClass, java.lang.Object typeValue)
          PUBLIC: Add a class indicator for the root classes subclass.
 void addClassIndicatorFieldToInsertRow(org.eclipse.persistence.internal.sessions.AbstractRecord databaseRow)
          INTERNAL: Add abstract class indicator information to the database row.
 void addClassIndicatorFieldToRow(org.eclipse.persistence.internal.sessions.AbstractRecord databaseRow)
          INTERNAL: Add abstract class indicator information to the database row.
protected  void addClassIndicatorTypeToParent(java.lang.Object indicator)
          INTERNAL: Post initialize the child descriptors
 void addClassNameIndicator(java.lang.String childClassName, java.lang.Object typeValue)
          INTERNAL: Add the class name reference by class name, used by the MW.
protected  void addFieldsToParent(java.util.Vector fields)
          INTERNAL: Recursively adds fields to all the parents
 void appendWithAllSubclassesExpression(org.eclipse.persistence.internal.expressions.SQLSelectStatement selectStatement)
          INTERNAL: Append the branch with all subclasses expression to the statement.
 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.
 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.
 java.lang.Class classFromRow(org.eclipse.persistence.internal.sessions.AbstractRecord rowFromDatabase, org.eclipse.persistence.internal.sessions.AbstractSession session)
          INTERNAL: This method is invoked only for the abstract descriptors.
 java.lang.Object clone()
          INTERNAL: Clone the policy
 void convertClassNamesToClasses(java.lang.ClassLoader classLoader)
          INTERNAL: Convert all the class-name-based settings in this InheritancePolicy to actual class-based settings.
 void dontReadSubclassesOnQueries()
          PUBLIC: Set the descriptor to only read instance of itself when queried.
 void dontUseClassNameAsIndicator()
          PUBLIC: Set the descriptor not to use the class' full name as the indicator.
protected  java.util.Vector getAllChildClassIndicators()
          INTERNAL: Stores class indicators for all child and children's children.
 java.util.Vector getAllChildDescriptors()
          INTERNAL: Returns all the child descriptors, even descriptors for subclasses of subclasses.
protected  java.util.Vector getAllChildDescriptors(java.util.Vector allChildDescriptors)
          INTERNAL: Recursive subroutine of getAllChildDescriptors.
 java.util.Vector getAllTables()
          INTERNAL: all tables for reference class plus childrenTables
 java.util.Vector getChildDescriptors()
          INTERNAL: Return all the immediate child descriptors.
 Expression getChildrenJoinExpression()
          INTERNAL: all expressions from childrenTablesJoinExpressions ANDed together
 java.util.List getChildrenTables()
          INTERNAL: if reads subclasses, all tables for all read subclasses (indirect included).
 java.util.Map getChildrenTablesJoinExpressions()
          INTERNAL: join expression for each child table, keyed by the table
protected  java.lang.reflect.Method getClassExtractionMethod()
          INTERNAL: Return all the classExtractionMethod
 java.lang.String getClassExtractionMethodName()
          ADVANCED: A class extraction method can be registered with the descriptor to override the default inheritance mechanism.
 ClassExtractor getClassExtractor()
          ADVANCED: A class extractor can be registered with the descriptor to override the default inheritance mechanism.
 java.util.Vector getClassIndicatorAssociations()
          INTERNAL: Return the class indicator associations for XML.
 org.eclipse.persistence.internal.helper.DatabaseField getClassIndicatorField()
          INTERNAL: Returns field that the class type indicator is store when using inheritance.
 java.lang.String getClassIndicatorFieldName()
          PUBLIC: Return the class indicator field name.
 java.util.Map getClassIndicatorMapping()
          INTERNAL: Return the association of indicators and classes using specified ConversionManager
protected  java.lang.Object getClassIndicatorValue()
          INTERNAL: Returns value of the abstract class indicator for the Java class.
protected  java.lang.Object getClassIndicatorValue(java.lang.Class javaClass)
          INTERNAL: Returns the indicator field value for the given class If no abstract indicator mapping is specified, use the class name.
 java.util.Map getClassNameIndicatorMapping()
          INTERNAL: Return the mapping from class name to indicator, used by MW.
 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.
 ClassDescriptor getDescriptor()
          INTERNAL: Returns the descriptor which the policy belongs to.
 ClassDescriptor getDescriptor(java.lang.Class theClass)
          INTERNAL: Returns descriptor corresponding to the class owning the policy or its subclass - otherwise null.
 Expression getOnlyInstancesExpression()
          ADVANCED: Return the 'only instances expression'.
 java.lang.Class getParentClass()
          PUBLIC: Return the parent class.
 java.lang.String getParentClassName()
          INTERNAL: Return the parent class name.
 ClassDescriptor getParentDescriptor()
          INTERNAL: Return the parent descriptor.
 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.
 java.lang.String getReadAllSubclassesViewName()
          ADVANCED: The view can be used to optimize/customize the query for all subclasses where they have multiple tables.
 ClassDescriptor getRootParentDescriptor()
          INTERNAL: Return the root parent descriptor
 ClassDescriptor getSubclassDescriptor(java.lang.Class theClass)
          INTERNAL: use aggregate in inheritance
 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.
 Expression getWithAllSubclassesExpression()
          ADVANCED: Return the Expression which gets all subclasses.
 boolean hasChildren()
          INTERNAL: Check if descriptor has children
 boolean hasClassExtractor()
          INTERNAL:
 boolean hasClassIndicator()
          INTERNAL: Checks if the class is invloved in inheritance
 boolean hasMultipleTableChild()
          INTERNAL: Return if any children of this descriptor require information from another table not specified at the parent level.
 boolean hasView()
          INTERNAL: Return if a view is used for inheritance reads.
 void initialize(org.eclipse.persistence.internal.sessions.AbstractSession session)
          INTERNAL: Initialized the inheritance properties of the descriptor once the mappings are initialized.
protected  void initializeClassExtractor(org.eclipse.persistence.internal.sessions.AbstractSession session)
          INTERNAL: Setup the default classExtractionMethod, or if one was specified by the user make sure it is valid.
protected  void initializeOnlyInstancesExpression()
          INTERNAL: Initialize the expression to use to check the specific type field.
protected  void initializeOptimisticLocking()
          INTERNAL: Potentially override the optimistic locking behavior
protected  void initializeWithAllSubclassesExpression()
          INTERNAL: Initialize the expression to use for queries to the class and its subclasses.
 boolean isChildDescriptor()
          INTERNAL: Check if it is a child descriptor.
 boolean isJoinedStrategy()
          INTERNAL: Indicate whether a single table or joined inheritance strategy is being used.
 boolean isRootParentDescriptor()
          INTERNAL: Return whether or not is root parent descriptor
 void postInitialize(org.eclipse.persistence.internal.sessions.AbstractSession session)
          INTERNAL: Initialized the inheritance properties that cannot be initialized unitl after the mappings have been.
 void preInitialize(org.eclipse.persistence.internal.sessions.AbstractSession session)
          INTERNAL: Allow the inheritance properties of the descriptor to be initialized.
 void readSubclassesOnQueries()
          PUBLIC: Set the descriptor to read instance of itself and its subclasses when queried.
 void remoteInitialization(DistributedSession session)
          INTERNAL: Used to initialize a remote descriptor.
 boolean requiresMultipleTableSubclassRead()
          INTERNAL: Return if this descriptor has children that define additional tables and needs to read them.
protected  java.util.Vector selectAllRowUsingCustomMultipleTableSubclassRead(ReadAllQuery query)
          INTERNAL: Select all rows from a abstract table descriptor.
protected  java.util.Vector selectAllRowUsingDefaultMultipleTableSubclassRead(ReadAllQuery query)
          INTERNAL: Select all rows from a abstract table descriptor.
 java.util.Vector selectAllRowUsingMultipleTableSubclassRead(ReadAllQuery query)
          INTERNAL: Select all rows from a abstract table descriptor.
protected  org.eclipse.persistence.internal.sessions.AbstractRecord selectOneRowUsingCustomMultipleTableSubclassRead(ReadObjectQuery query)
          INTERNAL: Select one rows from a abstract table descriptor.
protected  org.eclipse.persistence.internal.sessions.AbstractRecord selectOneRowUsingDefaultMultipleTableSubclassRead(ReadObjectQuery query)
          INTERNAL: Select one row of any concrete subclass, This must use two selects, the first retrieves the type field only.
 org.eclipse.persistence.internal.sessions.AbstractRecord selectOneRowUsingMultipleTableSubclassRead(ReadObjectQuery query)
          INTERNAL: Select one row of any concrete subclass, This must use two selects, the first retrieves the type field only.
protected  void setAllChildClassIndicators(java.util.Vector allChildClassIndicators)
          INTERNAL:
 void setAlwaysUseOuterJoinForClassType(boolean choice)
          PUBLIC: Sets the inheritance policy to always use an outer join when querying across a relationship of class.
 void setChildDescriptors(java.util.Vector theChildDescriptors)
          INTERNAL:
 void setClassExtractionMethodName(java.lang.String staticClassClassExtractionMethod)
          ADVANCED: A class extraction method can be registered with the descriptor to override the default inheritance mechanism.
 void setClassExtractor(ClassExtractor classExtractor)
          ADVANCED: A class extractor can be registered with the descriptor to override the default inheritance mechanism.
 void setClassIndicatorAssociations(java.util.Vector classIndicatorAssociations)
          INTERNAL: Set the class indicator associations from reading the deployment XML.
 void setClassIndicatorField(org.eclipse.persistence.internal.helper.DatabaseField classIndicatorField)
          ADVANCED: To set the class indicator field.
 void setClassIndicatorFieldName(java.lang.String fieldName)
          PUBLIC: To set the class indicator field name.
 void setClassIndicatorMapping(java.util.Map classIndicatorMapping)
          PUBLIC: Set the association of indicators and classes.
 void setClassNameIndicatorMapping(java.util.Map classNameIndicatorMapping)
          INTERNAL: Set the class name indicator mapping, used by the MW.
 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.
 void setDescriptor(ClassDescriptor descriptor)
          INTERNAL: Set the descriptor.
 void setJoinedStrategy()
          INTERNAL: Used to indicate a JOINED inheritance strategy.
 void setOnlyInstancesExpression(Expression onlyInstancesExpression)
          ADVANCED: Sets the expression used to select instance of the class only.
 void setParentClass(java.lang.Class parentClass)
          PUBLIC: Set the parent class.
 void setParentClassName(java.lang.String parentClassName)
          INTERNAL: Set the parent class name, used by MW to avoid referencing the real class for deployment XML generation.
 void setParentDescriptor(ClassDescriptor parentDescriptor)
          INTERNAL:
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.
 void setReadAllSubclassesViewName(java.lang.String readAllSubclassesViewName)
          ADVANCED: The view can be used to optimize/customize the query for all subclasses where they have multiple tables.
 void setShouldOuterJoinSubclasses(boolean shouldOuterJoinSubclasses)
          PUBLIC: Set if an outer join should be used to read subclasses.
 void setShouldReadSubclasses(boolean shouldReadSubclasses)
          PUBLIC: Set the descriptor to read instance of itself and its subclasses when queried.
 void setShouldReadSubclasses(java.lang.Boolean shouldReadSubclasses)
          INTERNAL: Set the descriptor to read instance of itself and its subclasses when queried.
 void setShouldUseClassNameAsIndicator(boolean shouldUseClassNameAsIndicator)
          PUBLIC: Set if the descriptor uses the classes fully qualified name as the indicator.
 void setSingleTableStrategy()
          INTERNAL: Used to indicate a SINGLE_TABLE inheritance strategy.
 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.
 void setWithAllSubclassesExpression(Expression withAllSubclassesExpression)
          ADVANCED: Sets the expression to be used for querying for a class and all its subclasses.
 boolean shouldAlwaysUseOuterJoin()
          PUBLIC: returns if the inheritance policy will always use an outerjoin when selecting class type
 boolean shouldOuterJoinSubclasses()
          PUBLIC: Return if an outer join should be used to read subclasses.
 boolean shouldReadSubclasses()
          PUBLIC: Return true if this descriptor should read instances of itself and subclasses on queries.
 java.lang.Boolean shouldReadSubclassesValue()
          INTERNAL: Return true if this descriptor should read instances of itself and subclasses on queries.
 boolean shouldUseClassNameAsIndicator()
          PUBLIC: Return true if the descriptor use the classes full name as the indicator.
 java.lang.String toString()
          INTERNAL:
 void useClassNameAsIndicator()
          PUBLIC: Set the descriptor to use the classes full name as the indicator.
 
Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

parentClass

protected java.lang.Class parentClass

parentClassName

protected java.lang.String parentClassName

parentDescriptor

protected ClassDescriptor parentDescriptor

childDescriptors

protected java.util.Vector childDescriptors

classIndicatorField

protected transient org.eclipse.persistence.internal.helper.DatabaseField classIndicatorField

classIndicatorMapping

protected transient java.util.Map classIndicatorMapping

classNameIndicatorMapping

protected transient java.util.Map classNameIndicatorMapping

shouldUseClassNameAsIndicator

protected transient boolean shouldUseClassNameAsIndicator

shouldReadSubclasses

protected transient java.lang.Boolean shouldReadSubclasses

hasMultipleTableChild

protected transient boolean hasMultipleTableChild

readAllSubclassesView

protected transient org.eclipse.persistence.internal.helper.DatabaseTable readAllSubclassesView

allChildClassIndicators

protected transient java.util.Vector allChildClassIndicators

onlyInstancesExpression

protected transient Expression onlyInstancesExpression

withAllSubclassesExpression

protected transient Expression withAllSubclassesExpression

allTables

protected transient java.util.Vector allTables

childrenTables

protected transient java.util.List childrenTables

childrenTablesJoinExpressions

protected transient java.util.Map childrenTablesJoinExpressions

childrenJoinExpression

protected transient Expression childrenJoinExpression

classExtractor

protected transient ClassExtractor classExtractor
Allow for class extraction method to be specified.


descriptor

protected ClassDescriptor descriptor

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(java.lang.Class childClass,
                              java.lang.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(java.lang.String childClassName,
                                  java.lang.Object typeValue)
INTERNAL: Add the class name reference by class name, used by the MW.


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.


addClassIndicatorTypeToParent

protected void addClassIndicatorTypeToParent(java.lang.Object indicator)
INTERNAL: Post initialize the child descriptors


addFieldsToParent

protected void addFieldsToParent(java.util.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 java.lang.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.

Throws:
DescriptorException

clone

public java.lang.Object clone()
INTERNAL: Clone the policy

Overrides:
clone in class java.lang.Object

convertClassNamesToClasses

public void convertClassNamesToClasses(java.lang.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.


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 java.util.Vector getAllChildClassIndicators()
INTERNAL: Stores class indicators for all child and children's children. Used for queries on branch classes only.


getAllChildDescriptors

public java.util.Vector getAllChildDescriptors()
INTERNAL: Returns all the child descriptors, even descriptors for subclasses of subclasses. Required for bug 3019934.


getAllChildDescriptors

protected java.util.Vector getAllChildDescriptors(java.util.Vector allChildDescriptors)
INTERNAL: Recursive subroutine of getAllChildDescriptors.


getChildrenTables

public java.util.List getChildrenTables()
INTERNAL: if reads subclasses, all tables for all read subclasses (indirect included).


getChildrenTablesJoinExpressions

public java.util.Map 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 java.util.Vector getAllTables()
INTERNAL: all tables for reference class plus childrenTables


getChildDescriptors

public java.util.Vector getChildDescriptors()
INTERNAL: Return all the immediate child descriptors. Only descriptors from direct subclasses are returned.


getClassExtractionMethod

protected java.lang.reflect.Method getClassExtractionMethod()
INTERNAL: Return all the classExtractionMethod


getClassExtractionMethodName

public java.lang.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 java.util.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.


getClassIndicatorFieldName

public java.lang.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.


getClassIndicatorMapping

public java.util.Map getClassIndicatorMapping()
INTERNAL: Return the association of indicators and classes using specified ConversionManager


getClassNameIndicatorMapping

public java.util.Map getClassNameIndicatorMapping()
INTERNAL: Return the mapping from class name to indicator, used by MW.


getClassIndicatorValue

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


getClassIndicatorValue

protected java.lang.Object getClassIndicatorValue(java.lang.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.


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 java.lang.Class getParentClass()
PUBLIC: Return the parent class.


getParentClassName

public java.lang.String getParentClassName()
INTERNAL: Return the parent class name.


getParentDescriptor

public ClassDescriptor getParentDescriptor()
INTERNAL: Return the parent descriptor.


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 java.lang.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(java.lang.Class theClass)
INTERNAL: use aggregate in inheritance


getDescriptor

public ClassDescriptor getDescriptor(java.lang.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:


hasClassIndicator

public boolean hasClassIndicator()
INTERNAL: Checks if the class is invloved 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: Initialized 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


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


postInitialize

public void postInitialize(org.eclipse.persistence.internal.sessions.AbstractSession session)
INTERNAL: Initialized the inheritance properties that cannot be initialized unitl 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 java.util.Vector selectAllRowUsingCustomMultipleTableSubclassRead(ReadAllQuery 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 java.util.Vector selectAllRowUsingDefaultMultipleTableSubclassRead(ReadAllQuery 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

selectAllRowUsingMultipleTableSubclassRead

public java.util.Vector selectAllRowUsingMultipleTableSubclassRead(ReadAllQuery 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

selectOneRowUsingMultipleTableSubclassRead

public org.eclipse.persistence.internal.sessions.AbstractRecord selectOneRowUsingMultipleTableSubclassRead(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(java.util.Vector allChildClassIndicators)
INTERNAL:


setChildDescriptors

public void setChildDescriptors(java.util.Vector theChildDescriptors)
INTERNAL:


setClassExtractionMethodName

public void setClassExtractionMethodName(java.lang.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(java.util.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.


setClassIndicatorFieldName

public void setClassIndicatorFieldName(java.lang.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(java.util.Map classIndicatorMapping)
PUBLIC: Set the association of indicators and classes. This may be desired to be used by clients in strange inheritance models.


setClassNameIndicatorMapping

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


setDescriptor

public void setDescriptor(ClassDescriptor descriptor)
INTERNAL: Set the descriptor.


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:
describesNonPersistenceSubclasses -

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(java.lang.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(java.lang.String parentClassName)
INTERNAL: Set the parent class name, used by MW to avoid referencing the real class for deployment XML generation.


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(java.lang.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(java.lang.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.


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 java.lang.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.


toString

public java.lang.String toString()
INTERNAL:

Overrides:
toString in class java.lang.Object

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.


EclipseLink 1.1.4, build 'v20100812-r7860' API Reference