org.datanucleus

Class FetchGroup

java.lang.Object

org.datanucleus.FetchGroup

All Implemented Interfaces:

Serializable

public class FetchGroup
extends Object
implements Serializable

Group of fields for fetching, to be part of a FetchPlan. Defined at runtime, via the API.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static String	ALL
static String	BASIC
static String	DEFAULT
protected static Localiser	LOCALISER Localisation utility for output messages
static String	MULTIVALUED
static String	RELATIONSHIP

Constructor Summary

Constructors

Constructor and Description
FetchGroup(FetchGroup grp) Constructor to take a copy of the supplied group, but modifiable.
FetchGroup(NucleusContext nucleusCtx, String name, Class cls) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
FetchGroup	addCategory(String categoryName) Convenience method to add the members for the specified category.
FetchGroup	addMember(String memberName) Method to add a field of the class to the fetch group.
FetchGroup	addMembers(String[] members)
void	deregisterListener(FetchPlan plan) Method to deregister a listener for changes to this FetchGroup.
void	disconnectFromListeners() Method to disconnect this fetch group from all listeners since the group is removed from use.
boolean	equals(Object obj)
Set<String>	getMembers() Accessor for the members that are in this fetch group.
String	getName() Accessor for the group name.
boolean	getPostLoad() Accessor for whether to call postLoad when this group is loaded.
int	getRecursionDepth(String memberName) Accessor for the recursion depth for the specified field/property.
Class	getType() Accessor for the class that this group is for.
int	hashCode()
boolean	isUnmodifiable() Accessor for modifiability status of this group.
void	registerListener(FetchPlan plan) Method to register a listener for changes to this FetchGroup.
FetchGroup	removeCategory(String categoryName) Convenience method to remove the members for the specified category.
FetchGroup	removeMember(String memberName) Method to remove a field of the class from the fetch group.
FetchGroup	removeMembers(String[] members)
void	setPostLoad(boolean postLoad) Mutator for whether the postLoad callback should be called on loading this fetch group.
FetchGroup	setRecursionDepth(String memberName, int recursionDepth) Method to set the recursion depth for the specified field/property.
FetchGroup	setUnmodifiable() Method to make the group unmodifiable.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

LOCALISER

protected static final Localiser LOCALISER

Localisation utility for output messages

DEFAULT

public static final String DEFAULT

See Also:

Constant Field Values

RELATIONSHIP

public static final String RELATIONSHIP

See Also:

Constant Field Values

MULTIVALUED

public static final String MULTIVALUED

See Also:

Constant Field Values

BASIC

public static final String BASIC

See Also:

Constant Field Values

ALL

public static final String ALL

See Also:

Constant Field Values

Constructor Detail

FetchGroup

public FetchGroup(NucleusContext nucleusCtx,
          String name,
          Class cls)

Constructor.

Parameters:

nucleusCtx - Context

name - Name of the group

cls - The class

FetchGroup

public FetchGroup(FetchGroup grp)

Constructor to take a copy of the supplied group, but modifiable.

Parameters:

grp - The existing group

Method Detail

getName

public String getName()

Accessor for the group name.

Returns:

Name of the group

getType

public Class getType()

Accessor for the class that this group is for.

Returns:

the class

setPostLoad

public void setPostLoad(boolean postLoad)

Mutator for whether the postLoad callback should be called on loading this fetch group.

Parameters:

postLoad - Whether the postLoad callback should be called.

getPostLoad

public boolean getPostLoad()

Accessor for whether to call postLoad when this group is loaded.

Returns:

Whether to call postLoad

getRecursionDepth

public int getRecursionDepth(String memberName)

Accessor for the recursion depth for the specified field/property.

Parameters:

memberName - Name of field/property

Returns:

The recursion depth

setRecursionDepth

public FetchGroup setRecursionDepth(String memberName,
                           int recursionDepth)

Method to set the recursion depth for the specified field/property.

Parameters:

memberName - Name of field/property

recursionDepth - Recursion depth

Returns:

The fetch group

setUnmodifiable

public FetchGroup setUnmodifiable()

Method to make the group unmodifiable. Once unmodifiable it cannot be made modifiable again.

Returns:

This group

isUnmodifiable

public boolean isUnmodifiable()

Accessor for modifiability status of this group.

Returns:

Whether it is no longer modifiable

addCategory

public FetchGroup addCategory(String categoryName)

Convenience method to add the members for the specified category. Supports the categories defined in the JDO2.2 spec.

Parameters:

categoryName - Name of the category

Returns:

This group

removeCategory

public FetchGroup removeCategory(String categoryName)

Convenience method to remove the members for the specified category. Supports the categories defined in the JDO2.2 spec.

Parameters:

categoryName - Name of the category

Returns:

This group

getMembers

public Set<String> getMembers()

Accessor for the members that are in this fetch group.

Returns:

Set of member names.

addMember

public FetchGroup addMember(String memberName)

Method to add a field of the class to the fetch group.

Parameters:

memberName - Name of the field/property

Returns:

This FetchGroup

Throws:

NucleusUserException - if the field/property doesn't exist for this class

removeMember

public FetchGroup removeMember(String memberName)

Method to remove a field of the class from the fetch group.

Parameters:

memberName - Name of the field/property

Returns:

This FetchGroup

Throws:

NucleusUserException - if the field/property doesn't exist for this class

addMembers

public FetchGroup addMembers(String[] members)

removeMembers

public FetchGroup removeMembers(String[] members)

registerListener

public void registerListener(FetchPlan plan)

Method to register a listener for changes to this FetchGroup.

Parameters:

plan - The FetchPlan that is listening

deregisterListener

public void deregisterListener(FetchPlan plan)

Method to deregister a listener for changes to this FetchGroup.

Parameters:

plan - The FetchPlan that is no longer listening

disconnectFromListeners

public void disconnectFromListeners()

Method to disconnect this fetch group from all listeners since the group is removed from use.

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object