FetchPlan (DataNucleus Core 5.1.13-SNAPSHOT API)

java.lang.Object
- org.datanucleus.FetchPlan

All Implemented Interfaces:

Serializable
```
public class FetchPlan
extends Object
implements Serializable
```
FetchPlan for fields for use internally. A FetchPlan has a series of FetchPlanForClass objects being the fetch plan for particular classes. Each FetchPlanForClass defines a series of fields of that class that are part of the fetch plan. There are two types of fetch groups under consideration here.
- Static fetch groups, defined in MetaData (XML/Annotations).
- Dynamic fetch groups, defined via an API.
See Also:

Serialized Form

Field Summary

Fields
Modifier and Type	Field and Description
`static String`	`ALL` Constant defining all fields
`static String`	`DEFAULT` Constant defining the fields in the default fetch group.
`static int`	`DETACH_LOAD_FIELDS` Members that are not loaded but are in the current fetch plan should be loaded before detachment.
`static int`	`DETACH_UNLOAD_FIELDS` Members that are loaded but not in current fetch plan should be unloaded before detachment.
`static int`	`FETCH_SIZE_GREEDY` Fetch size to load all possible.
`static int`	`FETCH_SIZE_OPTIMAL` Fetch size for the implementation to decide how many to load.
`static String`	`NONE` Constant defing no fields.

Constructor Summary

Constructors
Constructor and Description

FetchPlan(ExecutionContext ec, ClassLoaderResolver clr)
Constructor.

Constructors
Constructor and Description
`FetchPlan(ExecutionContext ec, ClassLoaderResolver clr)` Constructor.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`FetchPlan`	`addGroup(String grpName)` Method to add a group to the fetch plan.
`FetchPlan`	`clearGroups()` Method to clear the current groups and activate the DFG.
`FetchPlan`	`getCopy()` Returns a copy of this FetchPlan with all settings initialized.
`int`	`getDetachmentOptions()` Return the options to be used at detachment.
`Class[]`	`getDetachmentRootClasses()` Accessor for the root classes of the detachment graph for DetachAllOnCommit.
`Collection<Object>`	`getDetachmentRoots()` Accessor for the roots of the detachment graph for DetachAllOnCommit.
`FetchPlanForClass`	`getFetchPlanForClass(AbstractClassMetaData cmd)` Access the fetch plan for the class.
`int`	`getFetchSize()` Accessor for the fetch size when using large result sets.
`Set<String>`	`getGroups()` Accessor for the static groups for this FetchPlan.
`int`	`getMaxFetchDepth()` Accessor for the maximum fetch depth.
`void`	`notifyFetchGroupChange(FetchGroup group)` Method to notify this FetchPlan that the specified FetchGroup has been updated.
`void`	`notifyFetchGroupRemove(FetchGroup group)` Method to notify this FetchPlan that the specified FetchGroup has been updated.
`FetchPlan`	`removeGroup(String grpName)` Method to remove a group from the fetch plan.
`FetchPlan`	`setDetachmentOptions(int options)` Set the options to be used at detachment.
`FetchPlan`	`setDetachmentRootClasses(Class[] rootClasses)` Set the classes used for roots of the detachment graph for DetachAllOnCommit.
`FetchPlan`	`setDetachmentRoots(Collection roots)` Set the roots for DetachAllOnCommit
`FetchPlan`	`setFetchSize(int fetchSize)` Method to set the fetch size when using large result sets.
`FetchPlan`	`setGroup(String grpName)` Method to set the fetch group.
`FetchPlan`	`setGroups(Collection<String> grpNames)` Method to set the groups of the fetch plan.
`FetchPlan`	`setGroups(String[] grpNames)` Method to set the groups using an array.
`FetchPlan`	`setMaxFetchDepth(int max)` Mutator for the maximum fetch depth where -1 implies no restriction on the fetch depth and 0 is invalid and throws a JDOUserException.
`String`	`toString()`
`String`	`toStringWithClasses()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - DEFAULT
```
public static final String DEFAULT
```
    Constant defining the fields in the default fetch group.
    
    See Also:
    
    Constant Field Values
  - ALL
```
public static final String ALL
```
    Constant defining all fields
    
    See Also:
    
    Constant Field Values
  - NONE
```
public static final String NONE
```
    Constant defing no fields.
    
    See Also:
    
    Constant Field Values
  - DETACH_UNLOAD_FIELDS
```
public static final int DETACH_UNLOAD_FIELDS
```
    Members that are loaded but not in current fetch plan should be unloaded before detachment.
    
    See Also:
    
    Constant Field Values
  - DETACH_LOAD_FIELDS
```
public static final int DETACH_LOAD_FIELDS
```
    Members that are not loaded but are in the current fetch plan should be loaded before detachment.
    
    See Also:
    
    Constant Field Values
  - FETCH_SIZE_GREEDY
```
public static final int FETCH_SIZE_GREEDY
```
    Fetch size to load all possible.
    
    See Also:
    
    Constant Field Values
  - FETCH_SIZE_OPTIMAL
```
public static final int FETCH_SIZE_OPTIMAL
```
    Fetch size for the implementation to decide how many to load.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - FetchPlan
```
public FetchPlan(ExecutionContext ec,
                 ClassLoaderResolver clr)
```
    Constructor. Initially has the default fetch group.
    
    Parameters:
    
    ec - execution context
    
    clr - ClassLoader Resolver
- Method Detail
  - getFetchPlanForClass
```
public FetchPlanForClass getFetchPlanForClass(AbstractClassMetaData cmd)
```
    Access the fetch plan for the class.
    
    Parameters:
    
    cmd - metadata for the class
    
    Returns:
    
    the FetchPlanForClass
  - addGroup
```
public FetchPlan addGroup(String grpName)
```
    Method to add a group to the fetch plan.
    
    Parameters:
    
    grpName - The fetch group to add
    
    Returns:
    
    Updated Fetch Plan
  - removeGroup
```
public FetchPlan removeGroup(String grpName)
```
    Method to remove a group from the fetch plan.
    
    Parameters:
    
    grpName - The fetch group to remove
    
    Returns:
    
    Updated Fetch Plan
  - clearGroups
```
public FetchPlan clearGroups()
```
    Method to clear the current groups and activate the DFG.
    
    Returns:
    
    The FetchPlan
  - getGroups
```
public Set<String> getGroups()
```
    Accessor for the static groups for this FetchPlan. Doesn't return the dynamic groups.
    
    Returns:
    
    The fetch plan groups (unmodifiable)
  - setGroups
```
public FetchPlan setGroups(Collection<String> grpNames)
```
    Method to set the groups of the fetch plan.
    
    Parameters:
    
    grpNames - Names of the groups
    
    Returns:
    
    Updated Fetch Plan
  - setGroups
```
public FetchPlan setGroups(String[] grpNames)
```
    Method to set the groups using an array.
    
    Parameters:
    
    grpNames - Names of the groups
    
    Returns:
    
    The Fetch Plan
  - setGroup
```
public FetchPlan setGroup(String grpName)
```
    Method to set the fetch group.
    
    Parameters:
    
    grpName - Name of the group
    
    Returns:
    
    The Fetch Plan
  - notifyFetchGroupChange
```
public void notifyFetchGroupChange(FetchGroup group)
```
    Method to notify this FetchPlan that the specified FetchGroup has been updated. dynamic fetch groups extension
    
    Parameters:
    
    group - The dynamic FetchGroup
  - notifyFetchGroupRemove
```
public void notifyFetchGroupRemove(FetchGroup group)
```
    Method to notify this FetchPlan that the specified FetchGroup has been updated. dynamic fetch groups extension
    
    Parameters:
    
    group - The dynamic FetchGroup
  - setDetachmentRoots
```
public FetchPlan setDetachmentRoots(Collection roots)
```
    Set the roots for DetachAllOnCommit
    
    Parameters:
    
    roots - The roots of the detachment graph.
    
    Returns:
    
    The fetch plan with these roots
  - getDetachmentRoots
```
public Collection<Object> getDetachmentRoots()
```
    Accessor for the roots of the detachment graph for DetachAllOnCommit.
    
    Returns:
    
    The roots of the detachment graph.
  - setDetachmentRootClasses
```
public FetchPlan setDetachmentRootClasses(Class[] rootClasses)
```
    Set the classes used for roots of the detachment graph for DetachAllOnCommit.
    
    Parameters:
    
    rootClasses - Classes to be used as roots of the detachment graph
    
    Returns:
    
    The fetch plan with these roots
  - getDetachmentRootClasses
```
public Class[] getDetachmentRootClasses()
```
    Accessor for the root classes of the detachment graph for DetachAllOnCommit.
    
    Returns:
    
    The classes to be used as the root of the detachment graph.
  - setMaxFetchDepth
```
public FetchPlan setMaxFetchDepth(int max)
```
    Mutator for the maximum fetch depth where -1 implies no restriction on the fetch depth and 0 is invalid and throws a JDOUserException.
    
    Parameters:
    
    max - The maximum fetch depth to fetch to
    
    Returns:
    
    The FetchPlan
  - getMaxFetchDepth
```
public int getMaxFetchDepth()
```
    Accessor for the maximum fetch depth.
    
    Returns:
    
    The maximum fetch depth
  - setFetchSize
```
public FetchPlan setFetchSize(int fetchSize)
```
    Method to set the fetch size when using large result sets.
    
    Parameters:
    
    fetchSize - the size
    
    Returns:
    
    Updated Fetch Plan
  - getFetchSize
```
public int getFetchSize()
```
    Accessor for the fetch size when using large result sets.
    
    Returns:
    
    The size
  - getDetachmentOptions
```
public int getDetachmentOptions()
```
    Return the options to be used at detachment.
    
    Returns:
    
    Detachment options
  - setDetachmentOptions
```
public FetchPlan setDetachmentOptions(int options)
```
    Set the options to be used at detachment.
    
    Parameters:
    
    options - The options
    
    Returns:
    
    The updated fetch plan.
  - getCopy
```
public FetchPlan getCopy()
```
    Returns a copy of this FetchPlan with all settings initialized. Used when a Query has to have its own FetchPlan, so takes a copy of that of the ExecutionContext.
    
    Returns:
    
    the FetchPlan copy
  - toStringWithClasses
```
public String toStringWithClasses()
```
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object

Class FetchPlan

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

DEFAULT

ALL

NONE

DETACH_UNLOAD_FIELDS

DETACH_LOAD_FIELDS

FETCH_SIZE_GREEDY

FETCH_SIZE_OPTIMAL

Constructor Detail

FetchPlan

Method Detail

getFetchPlanForClass

addGroup

removeGroup

clearGroups

getGroups

setGroups

setGroups

setGroup

notifyFetchGroupChange

notifyFetchGroupRemove

setDetachmentRoots

getDetachmentRoots

setDetachmentRootClasses

getDetachmentRootClasses

setMaxFetchDepth

getMaxFetchDepth

setFetchSize

getFetchSize

getDetachmentOptions

setDetachmentOptions

getCopy

toStringWithClasses

toString