org.datanucleus.store.types.sco.simple
Class HashSet

java.lang.Object
  extended by java.util.AbstractCollection<E>
      extended by java.util.AbstractSet<E>
          extended by java.util.HashSet
              extended by org.datanucleus.store.types.sco.simple.HashSet
All Implemented Interfaces:
java.io.Serializable, java.lang.Cloneable, java.lang.Iterable, java.util.Collection, java.util.Set, SCO, SCOCollection, SCOContainer, SCOMtoN
Direct Known Subclasses:
HashSet

public class HashSet
extends java.util.HashSet
implements SCOCollection, SCOMtoN, java.lang.Cloneable

A mutable second-class HashSet object. This is the simplified form that intercepts mutators and marks the field as dirty. It also handles cascade-delete triggering for persistable elements.

See Also:
Serialized Form

Field Summary
protected  java.util.HashSet delegate
          The internal "delegate".
protected  java.lang.String fieldName
           
protected  int fieldNumber
           
protected static Localiser LOCALISER
           
protected  java.lang.Object owner
           
protected  ObjectProvider ownerSM
           
 
Constructor Summary
HashSet(ObjectProvider ownerSM, java.lang.String fieldName)
          Constructor, using the StateManager of the "owner" and the field name.
 
Method Summary
 boolean add(java.lang.Object element)
          Method to add an element to the set.
 boolean addAll(java.util.Collection c)
          Method to add a collection to the set.
 void attachCopy(java.lang.Object value)
          Method to return an attached copy of the passed (detached) value.
 void clear()
          Method to clear the HashSet
 java.lang.Object clone()
          Creates and returns a copy of this object.
 boolean contains(java.lang.Object element)
          Accessor for whether an element is contained in this set.
 boolean containsAll(java.util.Collection c)
          Accessor for whether a collection is contained in this set.
 java.lang.Object detachCopy(FetchPlanState state)
          Method to return a detached copy of the container.
 boolean equals(java.lang.Object o)
          Equality operator.
 void flush()
          Method to flush the changes to the datastore when operating in queued mode.
 java.lang.String getFieldName()
          Accessor for the field name.
 java.lang.Object getOwner()
          Accessor for the owner object.
 java.lang.Object getValue()
          Accessor for the unwrapped value that we are wrapping.
 int hashCode()
          Hashcode operator.
 void initialise()
          Method to initialise the SCO for use.
 void initialise(java.lang.Object o, boolean forInsert, boolean forUpdate)
          Method to initialise the SCO from an existing value.
 boolean isEmpty()
          Accessor for whether the HashSet is empty.
 boolean isLoaded()
          Method to return if the SCO has its contents loaded.
 java.util.Iterator iterator()
          Accessor for an iterator for the Set.
 void load()
          Method to effect the load of the data in the SCO.
 void makeDirty()
          Utility to mark the object as dirty
 boolean remove(java.lang.Object element)
          Method to remove an element from the set
 boolean remove(java.lang.Object element, boolean allowCascadeDelete)
          Method to remove an element from the set
 boolean removeAll(java.util.Collection elements)
          Method to remove all elements from the collection from the set.
 boolean retainAll(java.util.Collection c)
          Method to retain a Collection of elements (and remove all others).
 int size()
          Accessor for the size of the HashSet.
 java.lang.Object[] toArray()
          Method to return the list as an array.
 java.lang.Object[] toArray(java.lang.Object[] a)
          Method to return the list as an array.
 void unsetOwner()
          Method to unset the owner and field information.
 void updateEmbeddedElement(java.lang.Object element, int fieldNumber, java.lang.Object value)
          Method to update an embedded element in this collection.
protected  java.lang.Object writeReplace()
          The writeReplace method is called when ObjectOutputStream is preparing to write the object to the stream.
 
Methods inherited from class java.util.AbstractCollection
toString
 
Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
 

Field Detail

LOCALISER

protected static final Localiser LOCALISER

owner

protected transient java.lang.Object owner

ownerSM

protected transient ObjectProvider ownerSM

fieldName

protected transient java.lang.String fieldName

fieldNumber

protected transient int fieldNumber

delegate

protected java.util.HashSet delegate
The internal "delegate".

Constructor Detail

HashSet

public HashSet(ObjectProvider ownerSM,
               java.lang.String fieldName)
Constructor, using the StateManager of the "owner" and the field name.

Parameters:
ownerSM - The owner StateManager
fieldName - The name of the field of the SCO.
Method Detail

initialise

public void initialise(java.lang.Object o,
                       boolean forInsert,
                       boolean forUpdate)
Method to initialise the SCO from an existing value.

Specified by:
initialise in interface SCO
Parameters:
o - The object to set from
forInsert - Whether the object needs inserting in the datastore with this value
forUpdate - Whether to update the datastore with this value

initialise

public void initialise()
Method to initialise the SCO for use.

Specified by:
initialise in interface SCO

getValue

public java.lang.Object getValue()
Accessor for the unwrapped value that we are wrapping.

Specified by:
getValue in interface SCO
Returns:
The unwrapped value

load

public void load()
Method to effect the load of the data in the SCO. Used when the SCO supports lazy-loading to tell it to load all now.

Specified by:
load in interface SCOContainer

isLoaded

public boolean isLoaded()
Method to return if the SCO has its contents loaded. Returns true.

Specified by:
isLoaded in interface SCOContainer
Returns:
Whether it is loaded

flush

public void flush()
Method to flush the changes to the datastore when operating in queued mode. Does nothing in "direct" mode.

Specified by:
flush in interface SCOContainer

updateEmbeddedElement

public void updateEmbeddedElement(java.lang.Object element,
                                  int fieldNumber,
                                  java.lang.Object value)
Method to update an embedded element in this collection.

Specified by:
updateEmbeddedElement in interface SCOCollection
Parameters:
element - The element
fieldNumber - Number of field in the element
value - New value for this field

getFieldName

public java.lang.String getFieldName()
Accessor for the field name.

Specified by:
getFieldName in interface SCO
Returns:
The field name

getOwner

public java.lang.Object getOwner()
Accessor for the owner object.

Specified by:
getOwner in interface SCO
Returns:
The owner object

unsetOwner

public void unsetOwner()
Method to unset the owner and field information.

Specified by:
unsetOwner in interface SCO

makeDirty

public void makeDirty()
Utility to mark the object as dirty


detachCopy

public java.lang.Object detachCopy(FetchPlanState state)
Method to return a detached copy of the container. Recurse sthrough the elements so that they are likewise detached.

Specified by:
detachCopy in interface SCO
Parameters:
state - State for detachment process
Returns:
The detached container

attachCopy

public void attachCopy(java.lang.Object value)
Method to return an attached copy of the passed (detached) value. The returned attached copy is a SCO wrapper. Goes through the existing elements in the store for this owner field and removes ones no longer present, and adds new elements. All elements in the (detached) value are attached.

Specified by:
attachCopy in interface SCO
Parameters:
value - The new (collection) value

clone

public java.lang.Object clone()
Creates and returns a copy of this object.

Specified by:
clone in interface SCO
Overrides:
clone in class java.util.HashSet
Returns:
The cloned object

contains

public boolean contains(java.lang.Object element)
Accessor for whether an element is contained in this set.

Specified by:
contains in interface java.util.Collection
Specified by:
contains in interface java.util.Set
Specified by:
contains in interface SCOMtoN
Overrides:
contains in class java.util.HashSet
Parameters:
element - The element
Returns:
Whether it is contained.

containsAll

public boolean containsAll(java.util.Collection c)
Accessor for whether a collection is contained in this set.

Specified by:
containsAll in interface java.util.Collection
Specified by:
containsAll in interface java.util.Set
Overrides:
containsAll in class java.util.AbstractCollection
Parameters:
c - The collection
Returns:
Whether it is contained.

equals

public boolean equals(java.lang.Object o)
Equality operator.

Specified by:
equals in interface java.util.Collection
Specified by:
equals in interface java.util.Set
Overrides:
equals in class java.util.AbstractSet
Parameters:
o - The object to compare against.
Returns:
Whether this object is the same.

hashCode

public int hashCode()
Hashcode operator.

Specified by:
hashCode in interface java.util.Collection
Specified by:
hashCode in interface java.util.Set
Overrides:
hashCode in class java.util.AbstractSet
Returns:
The Hash code.

isEmpty

public boolean isEmpty()
Accessor for whether the HashSet is empty.

Specified by:
isEmpty in interface java.util.Collection
Specified by:
isEmpty in interface java.util.Set
Overrides:
isEmpty in class java.util.HashSet
Returns:
Whether it is empty.

iterator

public java.util.Iterator iterator()
Accessor for an iterator for the Set.

Specified by:
iterator in interface java.lang.Iterable
Specified by:
iterator in interface java.util.Collection
Specified by:
iterator in interface java.util.Set
Overrides:
iterator in class java.util.HashSet
Returns:
The iterator

size

public int size()
Accessor for the size of the HashSet.

Specified by:
size in interface java.util.Collection
Specified by:
size in interface java.util.Set
Overrides:
size in class java.util.HashSet
Returns:
The size.

toArray

public java.lang.Object[] toArray()
Method to return the list as an array.

Specified by:
toArray in interface java.util.Collection
Specified by:
toArray in interface java.util.Set
Overrides:
toArray in class java.util.AbstractCollection
Returns:
The array

toArray

public java.lang.Object[] toArray(java.lang.Object[] a)
Method to return the list as an array.

Specified by:
toArray in interface java.util.Collection
Specified by:
toArray in interface java.util.Set
Overrides:
toArray in class java.util.AbstractCollection
Parameters:
a - The runtime types of the array being defined by this param
Returns:
The array

add

public boolean add(java.lang.Object element)
Method to add an element to the set.

Specified by:
add in interface java.util.Collection
Specified by:
add in interface java.util.Set
Overrides:
add in class java.util.HashSet
Parameters:
element - The new element
Returns:
Whether it was added ok.

addAll

public boolean addAll(java.util.Collection c)
Method to add a collection to the set.

Specified by:
addAll in interface java.util.Collection
Specified by:
addAll in interface java.util.Set
Overrides:
addAll in class java.util.AbstractCollection
Parameters:
c - The collection
Returns:
Whether it was added ok.

clear

public void clear()
Method to clear the HashSet

Specified by:
clear in interface java.util.Collection
Specified by:
clear in interface java.util.Set
Overrides:
clear in class java.util.HashSet

remove

public boolean remove(java.lang.Object element)
Method to remove an element from the set

Specified by:
remove in interface java.util.Collection
Specified by:
remove in interface java.util.Set
Overrides:
remove in class java.util.HashSet
Parameters:
element - The Element to remove
Returns:
Whether it was removed successfully.

remove

public boolean remove(java.lang.Object element,
                      boolean allowCascadeDelete)
Method to remove an element from the set

Specified by:
remove in interface SCOCollection
Parameters:
element - The Element to remove
allowCascadeDelete - Whether to allow cascade delete
Returns:
Whether it was removed successfully.

removeAll

public boolean removeAll(java.util.Collection elements)
Method to remove all elements from the collection from the set.

Specified by:
removeAll in interface java.util.Collection
Specified by:
removeAll in interface java.util.Set
Overrides:
removeAll in class java.util.AbstractSet
Parameters:
elements - The collection of elements to remove
Returns:
Whether it was removed ok.

retainAll

public boolean retainAll(java.util.Collection c)
Method to retain a Collection of elements (and remove all others).

Specified by:
retainAll in interface java.util.Collection
Specified by:
retainAll in interface java.util.Set
Overrides:
retainAll in class java.util.AbstractCollection
Parameters:
c - The collection to retain
Returns:
Whether they were retained successfully.

writeReplace

protected java.lang.Object writeReplace()
                                 throws java.io.ObjectStreamException
The writeReplace method is called when ObjectOutputStream is preparing to write the object to the stream. The ObjectOutputStream checks whether the class defines the writeReplace method. If the method is defined, the writeReplace method is called to allow the object to designate its replacement in the stream. The object returned should be either of the same type as the object passed in or an object that when read and resolved will result in an object of a type that is compatible with all references to the object.

Returns:
the replaced object
Throws:
java.io.ObjectStreamException


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