Package net.ontopia.persistence.proxy

Class ReferenceFieldInfo

java.lang.Object

net.ontopia.persistence.proxy.AbstractFieldInfo

net.ontopia.persistence.proxy.ReferenceFieldInfo

All Implemented Interfaces:

FieldHandlerIF, FieldInfoIF

public class ReferenceFieldInfo
extends AbstractFieldInfo

INTERNAL: A field that references objects. A reference field is a field that references the identity of instances of a descriptor class. It is also known as a foreign key field.

A reference field is a composite of one or more fields that together references the identity of an instance of a descriptor class. The number of fields and the types of those fields must match the identity fields of the referenced descriptor class.

Field Summary

Fields

Modifier and Type	Field	Description
protected int	column_count
protected FieldInfoIF	identity_field
protected ClassInfoIF	value_cinfo
protected String[]	value_columns

Fields inherited from class net.ontopia.persistence.proxy.AbstractFieldInfo

cardinality, field, getter, index, is_collection, name, parent_cinfo, readonly, setter, value_class

Fields inherited from interface net.ontopia.persistence.proxy.FieldInfoIF

MANY_TO_MANY, ONE_TO_MANY, ONE_TO_ONE

Constructor Summary

Constructors

Constructor	Description
ReferenceFieldInfo(ClassInfoIF parent_cinfo, FieldDescriptor field, int index)

Method Summary

Modifier and Type	Method	Description
void	bind(Object value, PreparedStatement stm, int stmt_index)	INTERNAL: Binds the identity keys to the containing fields.
int	getColumnCount()	INTERNAL: Returns the number of columns that the field spans.
ClassInfoIF	getValueClassInfo()	INTERNAL: Gets the class info for the field's value type.
String[]	getValueColumns()	INTERNAL: Returns the names of the columns that the field spans.
boolean	isIdentityField()	INTERNAL: Returns true if the field handler references an object identity field.
Object	load(AccessRegistrarIF registrar, TicketIF ticket, ResultSet rs, int rsindex, boolean direct)	INTERNAL: Loads from its containing fields the identity of an object.
void	retrieveFieldValues(Object value, List<Object> field_values)
void	retrieveSQLValues(Object value, List<SQLValueIF> sql_values)
String	toString()

Methods inherited from class net.ontopia.persistence.proxy.AbstractFieldInfo

getCardinality, getDescriptor, getGetterMethod, getIndex, getJoinKeys, getJoinTable, getManyKeys, getName, getParentClassInfo, getSetterMethod, getTable, getValue, getValueClass, isAggregateField, isCollectionField, isPrimitiveField, isReadOnly, isReferenceField, setValue

Methods inherited from class java.lang.Object

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

Field Details

value_cinfo

protected ClassInfoIF value_cinfo

identity_field

protected FieldInfoIF identity_field

value_columns

protected String[] value_columns

column_count

protected int column_count

Constructor Details

ReferenceFieldInfo

public ReferenceFieldInfo(ClassInfoIF parent_cinfo,
 FieldDescriptor field,
 int index)

Method Details

getValueClassInfo

public ClassInfoIF getValueClassInfo()

Description copied from interface: FieldInfoIF

INTERNAL: Gets the class info for the field's value type. Note that primitive value classes don't have a class info.

getColumnCount

public int getColumnCount()

Description copied from interface: FieldHandlerIF

INTERNAL: Returns the number of columns that the field spans.

isIdentityField

public boolean isIdentityField()

Description copied from interface: FieldHandlerIF

INTERNAL: Returns true if the field handler references an object identity field.

getValueColumns

public String[] getValueColumns()

Description copied from interface: FieldInfoIF

INTERNAL: Returns the names of the columns that the field spans.

load

public Object load(AccessRegistrarIF registrar,
 TicketIF ticket,
 ResultSet rs,
 int rsindex,
 boolean direct)
            throws SQLException

INTERNAL: Loads from its containing fields the identity of an object.

Throws:

SQLException

bind

public void bind(Object value,
 PreparedStatement stm,
 int stmt_index)
          throws SQLException

INTERNAL: Binds the identity keys to the containing fields.

Throws:

SQLException

retrieveFieldValues

public void retrieveFieldValues(Object value,
 List<Object> field_values)

retrieveSQLValues

public void retrieveSQLValues(Object value,
 List<SQLValueIF> sql_values)

toString

public String toString()

Overrides:

toString in class Object