Package org.datanucleus.store.fieldmanager

Class AbstractFetchDepthFieldManager

java.lang.Object

org.datanucleus.store.fieldmanager.AbstractFieldManager

org.datanucleus.store.fieldmanager.AbstractFetchDepthFieldManager

All Implemented Interfaces:

FieldManager

Direct Known Subclasses:

DetachFieldManager, LoadFieldManager, MakeTransientFieldManager

public abstract class AbstractFetchDepthFieldManager
extends AbstractFieldManager

Base field manager for handling the fetching of fields. Supports a FetchPlan to navigate down an object graph. This is extended by specific managers for the detachment and makeTransient processes.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	AbstractFetchDepthFieldManager.EndOfFetchPlanGraphException	Exception thrown when we reach the end of the fetch depth in a branch of the object graph

Field Summary

Fields

Modifier and Type	Field	Description
protected final FetchPlanForClass	fpClass	Fetch Plan for the class of this object.
protected final boolean[]	secondClassMutableFields	Second class mutable fields for the class of this object.
protected final DNStateManager	sm	StateManager of the instance being fetched (detached or made transient).
protected final FetchPlanState	state	State for the fetch process.

Constructor Summary

Constructors

Constructor	Description
AbstractFetchDepthFieldManager(DNStateManager sm, boolean[] secondClassMutableFields, FetchPlanForClass fpClass, FetchPlanState state)	Constructor for a field manager for fetch plan processing.

Method Summary

Modifier and Type	Method	Description
protected abstract Object	endOfGraphOperation(int fieldNumber)	Method called when an end of graph is encountered.
boolean	fetchBooleanField(int fieldNumber)	Fetch a boolean field at the specified field number, returning it.
byte	fetchByteField(int fieldNumber)	Fetch a byte field at the specified field number, returning it.
char	fetchCharField(int fieldNumber)	Fetch a char field at the specified field number, returning it.
double	fetchDoubleField(int fieldNumber)	Fetch a double field at the specified field number, returning it.
float	fetchFloatField(int fieldNumber)	Fetch a float field at the specified field number, returning it.
int	fetchIntField(int fieldNumber)	Fetch an int field at the specified field number, returning it.
long	fetchLongField(int fieldNumber)	Fetch a long field at the specified field number, returning it.
Object	fetchObjectField(int fieldNumber)	Method to fetch an object field whether it is SCO collection, PC, or whatever.
short	fetchShortField(int fieldNumber)	Fetch a short field at the specified field number, returning it.
String	fetchStringField(int fieldNumber)	Fetch a string field at the specified field number, returning it.
protected abstract Object	internalFetchObjectField(int fieldNumber)	Method to fetch an object field whether it is SCO collection, PC, or whatever.

Methods inherited from class org.datanucleus.store.fieldmanager.AbstractFieldManager

storeBooleanField, storeByteField, storeCharField, storeDoubleField, storeFloatField, storeIntField, storeLongField, storeObjectField, storeShortField, storeStringField

Methods inherited from class java.lang.Object

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

Field Details

sm

protected final DNStateManager sm

StateManager of the instance being fetched (detached or made transient).

secondClassMutableFields

protected final boolean[] secondClassMutableFields

Second class mutable fields for the class of this object.

fpClass

protected final FetchPlanForClass fpClass

Fetch Plan for the class of this object.

state

protected final FetchPlanState state

State for the fetch process.

Constructor Details

AbstractFetchDepthFieldManager

public AbstractFetchDepthFieldManager(DNStateManager sm,
 boolean[] secondClassMutableFields,
 FetchPlanForClass fpClass,
 FetchPlanState state)

Constructor for a field manager for fetch plan processing.

Parameters:

sm - StateManager of the instance being processed.

secondClassMutableFields - SCO field flags

fpClass - Fetch Plan for the class of this instance

state - Object containing the state of the fetch process

Method Details

fetchObjectField

public Object fetchObjectField(int fieldNumber)
                        throws AbstractFetchDepthFieldManager.EndOfFetchPlanGraphException

Method to fetch an object field whether it is SCO collection, PC, or whatever.

Specified by:

fetchObjectField in interface FieldManager

Overrides:

fetchObjectField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The object

Throws:

AbstractFetchDepthFieldManager.EndOfFetchPlanGraphException

internalFetchObjectField

protected abstract Object internalFetchObjectField(int fieldNumber)

Method to fetch an object field whether it is SCO collection, PC, or whatever.

Parameters:

fieldNumber - Number of the field

Returns:

The object

endOfGraphOperation

protected abstract Object endOfGraphOperation(int fieldNumber)

Method called when an end of graph is encountered.

Parameters:

fieldNumber - Number of the field

Returns:

Object to return

fetchBooleanField

public boolean fetchBooleanField(int fieldNumber)

Description copied from interface: FieldManager

Fetch a boolean field at the specified field number, returning it.

Specified by:

fetchBooleanField in interface FieldManager

Overrides:

fetchBooleanField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value

fetchByteField

public byte fetchByteField(int fieldNumber)

Description copied from interface: FieldManager

Fetch a byte field at the specified field number, returning it.

Specified by:

fetchByteField in interface FieldManager

Overrides:

fetchByteField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value

fetchCharField

public char fetchCharField(int fieldNumber)

Description copied from interface: FieldManager

Fetch a char field at the specified field number, returning it.

Specified by:

fetchCharField in interface FieldManager

Overrides:

fetchCharField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value

fetchDoubleField

public double fetchDoubleField(int fieldNumber)

Description copied from interface: FieldManager

Fetch a double field at the specified field number, returning it.

Specified by:

fetchDoubleField in interface FieldManager

Overrides:

fetchDoubleField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value

fetchFloatField

public float fetchFloatField(int fieldNumber)

Description copied from interface: FieldManager

Fetch a float field at the specified field number, returning it.

Specified by:

fetchFloatField in interface FieldManager

Overrides:

fetchFloatField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value

fetchIntField

public int fetchIntField(int fieldNumber)

Description copied from interface: FieldManager

Fetch an int field at the specified field number, returning it.

Specified by:

fetchIntField in interface FieldManager

Overrides:

fetchIntField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value

fetchLongField

public long fetchLongField(int fieldNumber)

Description copied from interface: FieldManager

Fetch a long field at the specified field number, returning it.

Specified by:

fetchLongField in interface FieldManager

Overrides:

fetchLongField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value

fetchShortField

public short fetchShortField(int fieldNumber)

Description copied from interface: FieldManager

Fetch a short field at the specified field number, returning it.

Specified by:

fetchShortField in interface FieldManager

Overrides:

fetchShortField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value

fetchStringField

public String fetchStringField(int fieldNumber)

Description copied from interface: FieldManager

Fetch a string field at the specified field number, returning it.

Specified by:

fetchStringField in interface FieldManager

Overrides:

fetchStringField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value