org.datanucleus.store.fieldmanager
Class AbstractFetchFieldManager

java.lang.Object
  org.datanucleus.store.fieldmanager.AbstractFieldManager
      org.datanucleus.store.fieldmanager.AbstractFetchFieldManager

All Implemented Interfaces:

FieldConsumer, FieldManager, FieldSupplier

Direct Known Subclasses:

DetachFieldManager, LoadFieldManager, MakeTransientFieldManager

public abstract class AbstractFetchFieldManager
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

static class

AbstractFetchFieldManager.EndOfFetchPlanGraphException Exception thrown when we reach the end of the fetch depth in a branch of the object graph

Field Summary

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

Constructor Summary

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

Method Summary

protected abstract java.lang.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.
java.lang.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.
java.lang.String	fetchStringField(int fieldNumber) Fetch a string field at the specified field number, returning it.
protected abstract java.lang.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 Detail

sm

protected final ObjectProvider 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 FetchPlanForClass fpClass

Fetch Plan for the class of this object.

state

protected final FetchPlanState state

State for the fetch process.

Constructor Detail

AbstractFetchFieldManager

public AbstractFetchFieldManager(ObjectProvider sm,
                                 boolean[] secondClassMutableFields,
                                 FetchPlanForClass fpClass,
                                 FetchPlanState state)

Constructor for a field manager for fetch plan processing.

Parameters:

sm - the StateManager of the instance being processed.

secondClassMutableFields -

fpClass - Fetch Plan for the class of this instance

state - Object containing the state of the fetch process

Method Detail

fetchObjectField

public java.lang.Object fetchObjectField(int fieldNumber)
                                  throws AbstractFetchFieldManager.EndOfFetchPlanGraphException

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

Specified by:

fetchObjectField in interface FieldSupplier

Overrides:

fetchObjectField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The object

Throws:

AbstractFetchFieldManager.EndOfFetchPlanGraphException

internalFetchObjectField

protected abstract java.lang.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 java.lang.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: FieldSupplier

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

Specified by:

fetchBooleanField in interface FieldSupplier

Overrides:

fetchBooleanField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value

fetchByteField

public byte fetchByteField(int fieldNumber)

Description copied from interface: FieldSupplier

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

Specified by:

fetchByteField in interface FieldSupplier

Overrides:

fetchByteField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value

fetchCharField

public char fetchCharField(int fieldNumber)

Description copied from interface: FieldSupplier

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

Specified by:

fetchCharField in interface FieldSupplier

Overrides:

fetchCharField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value

fetchDoubleField

public double fetchDoubleField(int fieldNumber)

Description copied from interface: FieldSupplier

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

Specified by:

fetchDoubleField in interface FieldSupplier

Overrides:

fetchDoubleField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value

fetchFloatField

public float fetchFloatField(int fieldNumber)

Description copied from interface: FieldSupplier

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

Specified by:

fetchFloatField in interface FieldSupplier

Overrides:

fetchFloatField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value

fetchIntField

public int fetchIntField(int fieldNumber)

Description copied from interface: FieldSupplier

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

Specified by:

fetchIntField in interface FieldSupplier

Overrides:

fetchIntField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value

fetchLongField

public long fetchLongField(int fieldNumber)

Description copied from interface: FieldSupplier

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

Specified by:

fetchLongField in interface FieldSupplier

Overrides:

fetchLongField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value

fetchShortField

public short fetchShortField(int fieldNumber)

Description copied from interface: FieldSupplier

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

Specified by:

fetchShortField in interface FieldSupplier

Overrides:

fetchShortField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value

fetchStringField

public java.lang.String fetchStringField(int fieldNumber)

Description copied from interface: FieldSupplier

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

Specified by:

fetchStringField in interface FieldSupplier

Overrides:

fetchStringField in class AbstractFieldManager

Parameters:

fieldNumber - Number of the field

Returns:

The value