Glassfish example source code file (HashSet.java)
The Glassfish HashSet.java source code/*
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/*
* sco.HashSet.java
*/
package com.sun.jdo.spi.persistence.support.sqlstore.sco;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.ResourceBundle;
import com.sun.jdo.api.persistence.support.JDOUserException;
import com.sun.jdo.spi.persistence.support.sqlstore.PersistenceCapable;
import com.sun.jdo.spi.persistence.support.sqlstore.StateManager;
import com.sun.jdo.spi.persistence.support.sqlstore.SCOCollection;
import com.sun.jdo.spi.persistence.support.sqlstore.PersistenceManager;
import org.glassfish.persistence.common.I18NHelper;
/**
* A mutable 2nd class object date.
* @author Marina Vatkina
* @version 1.0
* @see java.util.HashSet
*/
public class HashSet
extends java.util.HashSet
implements SCOCollection
{
private transient PersistenceCapable owner;
private transient String fieldName;
private transient Class elementType;
private transient boolean allowNulls;
private transient java.util.HashSet added = new java.util.HashSet();
private transient java.util.HashSet removed = new java.util.HashSet();
private transient boolean isDeferred;
/**
* I18N message handlers
*/
private final static ResourceBundle messages = I18NHelper.loadBundle(
"com.sun.jdo.spi.persistence.support.sqlstore.impl.Bundle", // NOI18N
HashSet.class.getClassLoader());
private final static ResourceBundle messages1 = I18NHelper.loadBundle(
"com.sun.jdo.spi.persistence.support.sqlstore.Bundle", // NOI18N
HashSet.class.getClassLoader());
/**
* Creates a new empty <code>HashSet object.
* Assigns owning object and field name.
*
* @param owner the owning object
* @param fieldName the owning field name
* @param elementType the element types allowed
* @param allowNulls true if nulls are allowed
*/
public HashSet(Object owner, String fieldName, Class elementType, boolean allowNulls)
{
super();
if (owner instanceof PersistenceCapable)
{
this.owner = (PersistenceCapable)owner;
this.fieldName = fieldName;
}
this.elementType = elementType;
this.allowNulls = allowNulls;
}
/**
* Creates a new empty <code>HashSet object that has
* the specified initial capacity.Assigns owning object and field name.
*
* @param owner the owning object
* @param fieldName the owning field name
* @param elementType the element types allowed
* @param allowNulls true if nulls are allowed
* @param initialCapacity the initial capacity of the hash map.
* @throws IllegalArgumentException if the initial capacity is less
* than zero.
* @see java.util.HashSet
*/
public HashSet(Object owner, String fieldName,
Class elementType, boolean allowNulls,
int initialCapacity)
{
super(initialCapacity);
if (owner instanceof PersistenceCapable)
{
this.owner = (PersistenceCapable)owner;
this.fieldName = fieldName;
}
this.elementType = elementType;
this.allowNulls = allowNulls;
}
// -------------------------Public Methods------------------
/**
* Adds the specified element to this set if it is not already
* present.
*
* @param o element to be added to this set.
* @return <tt>true if the set did not already contain the specified
* element.
* @see java.util.HashSet
*/
public boolean add(Object o)
{
if (allowNulls == false && o == null)
{
throw new JDOUserException(I18NHelper.getMessage(messages,
"sco.nulls_not_allowed")); // NOI18N
}
if (elementType != null && !elementType.isAssignableFrom(o.getClass()))
{
throw new JDOUserException(I18NHelper.getMessage(messages,
"sco.classcastexception", elementType.getName()), // NOI18N
new ClassCastException(), new Object[] {o});
}
if (owner != null)
{
StateManager stateManager = owner.jdoGetStateManager();
if (stateManager != null)
{
PersistenceManager pm = (PersistenceManager) stateManager.getPersistenceManagerInternal();
pm.acquireShareLock();
boolean modified = false;
try
{
pm.acquireFieldUpdateLock();
try
{
// Mark the field as dirty
stateManager.makeDirty(fieldName);
modified = super.add(o);
if (modified)
{
if (removed.remove(o) == false)
{
added.add(o);
}
stateManager.applyUpdates(fieldName, this);
}
return modified;
}
finally
{
pm.releaseFieldUpdateLock();
}
}
catch (JDOUserException e)
{
Object[] failedObjects = e.getFailedObjectArray();
if (modified && (failedObjects != null))
{
//
// The failedObjects array may contain objects other
// than the one added. We iterate through it to find
// the one added and remove it from the collection.
//
for (int i = 0; i < failedObjects.length; i++)
{
Object failedObject = failedObjects[i];
if (failedObject == o)
{
super.remove(failedObject);
break;
}
}
}
throw e;
}
finally
{
pm.releaseShareLock();
}
}
}
return super.add(o);
}
/**
* Adds all of the elements in the specified collection to this collection
*
* @param c collection whose elements are to be added to this collection.
* @return <tt>true if this collection changed as a result of the
* call.
* @throws UnsupportedOperationException if the <tt>addAll method is
* not supported by this collection.
*
* @see java.util.AbstractCollection
* @see java.util.HashSet
*/
public boolean addAll(Collection c)
{
if (allowNulls == false && c.contains(null))
{
throw new JDOUserException(I18NHelper.getMessage(messages,
"sco.nulls_not_allowed")); // NOI18N
}
ArrayList errc = new ArrayList();
if (elementType != null)
{
// iterate the collection and make a list of wrong elements.
Iterator i = c.iterator();
while (i.hasNext())
{
Object o = i.next();
if (!elementType.isAssignableFrom(o.getClass()))
errc.add(o);
}
}
if (errc != null && errc.size() > 0)
{
throw new JDOUserException(I18NHelper.getMessage(messages,
"sco.classcastexception", elementType.getName()), // NOI18N
new ClassCastException(), errc.toArray());
}
boolean modified = false;
if (owner != null)
{
StateManager stateManager = owner.jdoGetStateManager();
if (stateManager != null)
{
PersistenceManager pm = (PersistenceManager) stateManager.getPersistenceManagerInternal();
pm.acquireShareLock();
try
{
pm.acquireFieldUpdateLock();
try
{
// Mark the field as dirty
stateManager.makeDirty(fieldName);
for (Iterator iter = c.iterator(); iter.hasNext();)
{
Object o = iter.next();
if (!super.contains(o))
{
if (removed.remove(o) == false)
{
added.add(o);
}
super.add(o);
modified = true;
}
}
// Apply updates
if (modified)
{
stateManager.applyUpdates(fieldName, this);
}
return modified;
}
finally
{
pm.releaseFieldUpdateLock();
}
}
catch (JDOUserException e)
{
Object[] failedObjects = e.getFailedObjectArray();
if (modified && (failedObjects != null))
{
for (int i = 0; i < failedObjects.length; i++)
{
super.remove(failedObjects[i]);
}
}
throw e;
}
finally
{
pm.releaseShareLock();
}
}
}
return super.addAll(c);
}
/**
* Removes the given element from this set if it is present.
*
* @param o object to be removed from this set, if present.
* @return <tt>true if the set contained the specified element.
* @see java.util.HashSet
*/
public boolean remove(Object o)
{
// Mark the field as dirty
if (owner != null)
{
StateManager stateManager = owner.jdoGetStateManager();
if (stateManager != null)
{
PersistenceManager pm = (PersistenceManager) stateManager.getPersistenceManagerInternal();
pm.acquireShareLock();
try
{
pm.acquireFieldUpdateLock();
try
{
stateManager.makeDirty(fieldName);
boolean modified = super.remove(o);
if (modified)
{
if (added.remove(o) == false)
{
removed.add(o);
}
stateManager.applyUpdates(fieldName, this);
}
return modified;
}
finally
{
pm.releaseFieldUpdateLock();
}
}
finally
{
pm.releaseShareLock();
}
}
}
return super.remove(o);
}
/**
* Removes from this collection all of its elements that are contained in
* the specified collection (optional operation). <p>
*
*
* @param c elements to be removed from this collection.
* @return <tt>true if this collection changed as a result of the
* call.
*
* @throws UnsupportedOperationException removeAll is not supported
* by this collection.
*
* @see java.util.HashSet
* @see java.util.AbstractCollection
*/
public boolean removeAll(Collection c)
{
// Mark the field as dirty
if (owner != null)
{
StateManager stateManager = owner.jdoGetStateManager();
if (stateManager != null)
{
PersistenceManager pm = (PersistenceManager) stateManager.getPersistenceManagerInternal();
pm.acquireShareLock();
try
{
pm.acquireFieldUpdateLock();
try
{
stateManager.makeDirty(fieldName);
for (Iterator iter = c.iterator(); iter.hasNext();)
{
Object o = iter.next();
if (super.contains(o))
{
if (added.remove(o) == false)
{
removed.add(o);
}
}
}
boolean modified = super.removeAll(c);
// Apply updates
if (modified)
{
stateManager.applyUpdates(fieldName, this);
}
return modified;
}
finally
{
pm.releaseFieldUpdateLock();
}
}
finally
{
pm.releaseShareLock();
}
}
}
return super.removeAll(c);
}
/**
* Retains only the elements in this collection that are contained in the
* specified collection (optional operation).
*
* @return <tt>true if this collection changed as a result of the
* call.
*
* @throws UnsupportedOperationException if the <tt>retainAll method
* is not supported by this collection.
*
* @see java.util.HashSet
* @see java.util.AbstractCollection
*/
public boolean retainAll(Collection c)
{
if (owner != null)
{
StateManager stateManager = owner.jdoGetStateManager();
if (stateManager != null)
{
PersistenceManager pm = (PersistenceManager) stateManager.getPersistenceManagerInternal();
pm.acquireShareLock();
try
{
pm.acquireFieldUpdateLock();
try
{
// Mark the field as dirty
stateManager.makeDirty(fieldName);
for (Iterator iter = super.iterator(); iter.hasNext();)
{
Object o = iter.next();
if (!c.contains(o))
{
if (added.remove(o) == false)
{
removed.add(o);
}
}
}
boolean modified = super.retainAll(c);
// Apply updates
if (modified)
{
stateManager.applyUpdates(fieldName, this);
}
return modified;
}
finally
{
pm.releaseFieldUpdateLock();
}
}
finally
{
pm.releaseShareLock();
}
}
}
return super.retainAll(c);
}
/**
* Removes all of the elements from this set.
* @see java.util.HashSet
*/
public void clear()
{
if (owner != null)
{
StateManager stateManager = owner.jdoGetStateManager();
if (stateManager != null)
{
PersistenceManager pm = (PersistenceManager) stateManager.getPersistenceManagerInternal();
pm.acquireShareLock();
try
{
pm.acquireFieldUpdateLock();
try
{
// Mark the field as dirty
stateManager.makeDirty(fieldName);
removed.clear();
added.clear();
for (Iterator iter = super.iterator(); iter.hasNext();)
{
removed.add(iter.next());
}
super.clear();
// Apply updates
stateManager.applyUpdates(fieldName, this);
return;
}
finally
{
pm.releaseFieldUpdateLock();
}
}
finally
{
pm.releaseShareLock();
}
}
}
super.clear();
}
/**
* Creates and returns a copy of this object.
*
* <P>Mutable Second Class Objects are required to provide a public
* clone method in order to allow for copying PersistenceCapable
* objects. In contrast to Object.clone(), this method must not throw a
* CloneNotSupportedException.
*/
public Object clone()
{
HashSet obj = (HashSet) super.clone();
// RESOLVE: check if added/removed should not be cleared
// for a deferred collection, but applyDeferredUpdates logic
// be used?
obj.unsetOwner();
return obj;
}
/**
* Returns an iterator over the elements in this set. The elements
* are returned in no particular order.
*
* @return an Iterator over the elements in this set.
* @see java.util.ConcurrentModificationException
*/
public Iterator iterator() {
return new SCOHashIterator(super.iterator(), this);
}
private class SCOHashIterator implements Iterator {
Iterator _iterator = null;
HashSet _caller = null;
Object lastReturned = null;
SCOHashIterator(Iterator it, HashSet cl) {
_iterator = it;
_caller = cl;
}
public boolean hasNext() {
return _iterator.hasNext();
}
public Object next() {
lastReturned = _iterator.next();
return lastReturned;
}
public void remove() {
// Check if called twice.
if (lastReturned == null)
throw new IllegalStateException();
if (_caller.owner != null) {
// Mark the field as dirty
StateManager stateManager = _caller.owner.jdoGetStateManager();
if (stateManager != null) {
PersistenceManager pm = (PersistenceManager) stateManager.getPersistenceManagerInternal();
pm.acquireShareLock();
try {
pm.acquireFieldUpdateLock();
try
{
stateManager.makeDirty(_caller.fieldName);
_iterator.remove();
if (added.remove(lastReturned) == false) {
removed.add(lastReturned);
}
stateManager.applyUpdates(_caller.fieldName, _caller);
} finally {
pm.releaseFieldUpdateLock();
}
}
finally
{
pm.releaseShareLock();
}
}
} else {
// No owner - regular HashSet operation.
_iterator.remove();
}
lastReturned = null;
}
}
//
// The following internal methods should be called under an outer lock such
// as fieldUpdateLock. There is no need to synchronize them.
//
/**
* Creates and returns a copy of this object without resetting the owner and field value.
*
*/
public Object cloneInternal()
{
return super.clone();
}
/**
* Cleans removed and added lists
*/
public void reset()
{
// RESOLVE: do we need to synchronize this??
if (added != null)
added.clear();
if (removed != null)
removed.clear();
}
/**
* Mark this HashSet as deferred.
*/
public void markDeferred()
{
isDeferred = true;
}
/**
* Return true is this HashSet is deferred, false otherwise.
*/
public boolean isDeferred()
{
return isDeferred;
}
/**
* If the HashSet is deferred, we first initialize the internal collection
* with c and they apply any deferred updates specified by the added and
* removed lists.
*/
public void applyDeferredUpdates(Collection c)
{
if (!isDeferred)
{
// should throw an exception??
return;
}
isDeferred = false;
addAllInternal(c);
addAllInternal(added);
removeAllInternal(removed);
added.clear();
removed.clear();
}
/**
* Adds an object to the list without recording changes if the HashSet is
* not deferred. Otherwise, add o to the added list.
*/
public void addInternal(Object o)
{
if (isDeferred)
{
if (removed.remove(o) == false)
{
added.add(o);
}
}
else
{
super.add(o);
}
}
/**
* Adds a Collection to the list without recording changes if the HashSet is
* not deferred. Otherwise, add o to the removed list.
*/
public void addAllInternal(Collection c)
{
if (c == null)
{
return;
}
Iterator iter = c.iterator();
while (iter.hasNext())
{
addInternal(iter.next());
}
}
/**
* @inheritDoc
*/
public void addToBaseCollection(Object o)
{
super.add(o);
}
/*
* Remove c from the list if the HashSet is not deferred.
* Otherwise, add c to the removed list.
*/
public void removeAllInternal(Collection c)
{
if (c == null)
{
return;
}
Iterator iter = c.iterator();
while (iter.hasNext())
{
removeInternal(iter.next());
}
}
/**
* Returns added collection
*
* @return added collection of added elements
*/
public Collection getAdded()
{
return (Collection)added;
}
/**
* Returns removed collection
*
* @return removed collection of removed elements
*/
public Collection getRemoved()
{
return (Collection)removed;
}
/**
* Clears Collection without notifing the owner
*/
public void clearInternal()
{
super.clear();
this.reset();
}
/**
* Removes an element without notifing the owner
*/
public void removeInternal(Object o)
{
if (isDeferred)
{
if (added.remove(o) == false)
{
removed.add(o);
}
}
else
{
super.remove(o);
}
}
/**
* Nullifies references to the owner Object and Field
*/
public void unsetOwner()
{
this.owner = null;
this.fieldName = null;
this.elementType = null;
added.clear();
removed.clear();
}
/**
* Returns the owner object of the SCO instance
*
* @return owner object
*/
public Object getOwner()
{
return this.owner;
}
/**
* Returns the field name
*
* @return field name as java.lang.String
*/
public String getFieldName()
{
return this.fieldName;
}
/**
* Marks object dirty
*/
public StateManager makeDirty()
{
StateManager stateManager = owner.jdoGetStateManager();
if (stateManager != null)
{
stateManager.makeDirty(fieldName);
}
return stateManager;
}
/**
* Apply changes (can be a no-op)
*/
public void applyUpdates(StateManager sm, boolean modified)
{
if (modified && sm != null)
{
sm.applyUpdates(fieldName, this);
}
}
/**
* Set the owner if this instance is not owned.
* @see SCOCollection#setOwner
* @param owner the new owner.
* @param fieldName the new field name.
* @param elementType the new element type as Class, or null if type
* is not checked or not supported.
*/
public void setOwner(Object owner, String fieldName, Class elementType) {
if (this.owner != null) {
throw new JDOUserException(I18NHelper.getMessage(
messages1, "core.statemanager.anotherowner"), // NOI18N
new Object[]{this.owner, this.fieldName});
}
if (owner instanceof PersistenceCapable) {
this.owner = (PersistenceCapable)owner;
this.fieldName = fieldName;
this.elementType = elementType;
}
}
}
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