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package oracle.toplink.essentials.indirection;
import java.util.*;
import oracle.toplink.essentials.internal.indirection.*;
/**
* IndirectList allows a domain class to take advantage of TopLink indirection
* without having to declare its instance variable as a ValueHolderInterface.
* <p>To use an IndirectList:<ul>
* <li> Declare the appropriate instance variable with type IndirectList (jdk1.1)
* or Collection/List/Vector (jdk1.2).
* <li> Send the message #useTransparentCollection() to the appropriate
* CollectionMapping.
* </ul>
* TopLink will place an
* IndirectList in the instance variable when the containing domain object is read from
* the datatabase. With the first message sent to the IndirectList, the contents
* are fetched from the database and normal Collection/List/Vector behavior is resumed.
*
* @see oracle.toplink.essentials.mappings.CollectionMapping
* @see oracle.toplink.essentials.indirection.IndirectMap
* @author Big Country
* @since TOPLink/Java 2.5
*/
public class IndirectList extends Vector implements IndirectContainer {
/** Reduce type casting. */
protected Vector delegate;
/** Delegate indirection behavior to a value holder. */
protected ValueHolderInterface valueHolder;
/** The mapping attribute name, used to raise change events. */
private transient String attributeName;
/** Store initial size for lazy init. */
protected int initialCapacity = 10;
/**
* PUBLIC:
* Construct an empty IndirectList so that its internal data array
* has size <tt>10</tt> and its standard capacity increment is zero.
*/
public IndirectList() {
this(10);
}
/**
* PUBLIC:
* Construct an empty IndirectList with the specified initial capacity and
* with its capacity increment equal to zero.
*
* @param initialCapacity the initial capacity of the vector
* @exception IllegalArgumentException if the specified initial capacity
* is negative
*/
public IndirectList(int initialCapacity) {
this(initialCapacity, 0);
}
/**
* PUBLIC:
* Construct an empty IndirectList with the specified initial capacity and
* capacity increment.
*
* @param initialCapacity the initial capacity of the vector
* @param capacityIncrement the amount by which the capacity is
* increased when the vector overflows
* @exception IllegalArgumentException if the specified initial capacity
* is negative
*/
public IndirectList(int initialCapacity, int capacityIncrement) {
super(0);
this.initialize(initialCapacity, capacityIncrement);
}
/**
* PUBLIC:
* Construct an IndirectList containing the elements of the specified
* collection, in the order they are returned by the collection's
* iterator.
* @param c a collection containing the elements to construct this IndirectList with.
*/
public IndirectList(Collection c) {
super(0);
this.initialize(c);
}
/**
* @see java.util.Vector#add(int, java.lang.Object)
*/
public void add(int index, Object element) {
this.getDelegate().add(index, element);
raiseAddChangeEvent(element);
}
/**
* Raise the add change event and relationship maintainence.
*/
protected void raiseAddChangeEvent(Object element) {
if (hasBeenRegistered()) {
((UnitOfWorkQueryValueHolder)getValueHolder()).updateForeignReferenceSet(element, null);
}
}
/**
* Raise the remove change event.
*/
protected void raiseRemoveChangeEvent(Object element) {
if (hasBeenRegistered()) {
((UnitOfWorkQueryValueHolder)getValueHolder()).updateForeignReferenceRemove(element);
}
}
/**
* @see java.util.Vector#add(java.lang.Object)
*/
public synchronized boolean add(Object o) {
this.getDelegate().add(o);
raiseAddChangeEvent(o);
return true;
}
/**
* @see java.util.Vector#addAll(int, java.util.Collection)
*/
public synchronized boolean addAll(int index, Collection c) {
Iterator objects = c.iterator();
// Must trigger add events if tracked or uow.
if (hasBeenRegistered()) {
while (objects.hasNext()) {
this.add(index, objects.next());
index++;
}
return true;
}
return this.getDelegate().addAll(index, c);
}
/**
* @see java.util.Vector#addAll(java.util.Collection)
*/
public synchronized boolean addAll(Collection c) {
// Must trigger add events if tracked or uow.
if (hasBeenRegistered()) {
Iterator objects = c.iterator();
while (objects.hasNext()) {
this.add(objects.next());
}
return true;
}
return getDelegate().addAll(c);
}
/**
* @see java.util.Vector#addElement(java.lang.Object)
*/
public synchronized void addElement(Object obj) {
this.add(obj);
}
/**
* PUBLIC:
* Return the freshly-built delegate.
* <br>In jdk1.1, the delegate may not be a Vector (in which case, it better be another IndirectList).
* <br>In jdk1.2, IndirectList is a subclass of Vector, so there is no need to check.
*/
protected Vector buildDelegate() {
return (Vector)getValueHolder().getValue();
}
/**
* @see java.util.Vector#capacity()
*/
public int capacity() {
return this.getDelegate().capacity();
}
/**
* @see java.util.Vector#clear()
*/
public void clear() {
if (hasBeenRegistered()) {
Iterator objects = this.iterator();
while (objects.hasNext()) {
Object o = objects.next();
objects.remove();
this.raiseRemoveChangeEvent(o);
}
} else {
this.getDelegate().clear();
}
}
/**
* PUBLIC:
* @see java.util.Vector#clone()
* This will result in a database query if necessary.
*/
/*
There are 3 situations when clone() is called:
1. The developer actually wants to clone the collection (typically to modify one
of the 2 resulting collections). In which case the contents must be read from
the database.
2. A UnitOfWork needs a clone (or backup clone) of the collection. But the
UnitOfWork checks "instantiation" before cloning collections ("un-instantiated"
collections are not cloned).
3. A MergeManager needs an extra copy of the collection (because the "backup"
and "target" are the same object?). But the MergeManager checks "instantiation"
before merging collections (again, "un-instantiated" collections are not merged).
*/
public synchronized Object clone() {
IndirectList result = (IndirectList)super.clone();
result.delegate = (Vector)this.getDelegate().clone();
result.attributeName = null;
return result;
}
/**
* PUBLIC:
* @see java.util.Vector#contains(java.lang.Object)
*/
public boolean contains(Object elem) {
return this.getDelegate().contains(elem);
}
/**
* @see java.util.Vector#containsAll(java.util.Collection)
*/
public synchronized boolean containsAll(Collection c) {
return this.getDelegate().containsAll(c);
}
/**
* @see java.util.Vector#copyInto(java.lang.Object[])
*/
public synchronized void copyInto(Object[] anArray) {
this.getDelegate().copyInto(anArray);
}
/**
* @see java.util.Vector#elementAt(int)
*/
public synchronized Object elementAt(int index) {
return this.getDelegate().elementAt(index);
}
/**
* @see java.util.Vector#elements()
*/
public Enumeration elements() {
return this.getDelegate().elements();
}
/**
* @see java.util.Vector#ensureCapacity(int)
*/
public synchronized void ensureCapacity(int minCapacity) {
this.getDelegate().ensureCapacity(minCapacity);
}
/**
* @see java.util.Vector#equals(java.lang.Object)
*/
public synchronized boolean equals(Object o) {
return this.getDelegate().equals(o);
}
/**
* @see java.util.Vector#firstElement()
*/
public synchronized Object firstElement() {
return this.getDelegate().firstElement();
}
/**
* @see java.util.Vector#get(int)
*/
public synchronized Object get(int index) {
return this.getDelegate().get(index);
}
/**
* PUBLIC:
* Check whether the contents have been read from the database.
* If they have not, read them and set the delegate.
*/
protected synchronized Vector getDelegate() {
if (delegate == null) {
delegate = this.buildDelegate();
}
return delegate;
}
/**
* PUBLIC:
* Return the valueHolder.
*/
public synchronized ValueHolderInterface getValueHolder() {
// PERF: lazy initialize value holder and vector as are normally set after creation.
if (valueHolder == null) {
valueHolder = new ValueHolder(new Vector(this.initialCapacity, this.capacityIncrement));
}
return valueHolder;
}
/**
* INTERNAL:
* return whether this IndirectList has been registered with the UnitOfWork
*/
public boolean hasBeenRegistered() {
return getValueHolder() instanceof oracle.toplink.essentials.internal.indirection.UnitOfWorkQueryValueHolder;
}
/**
* INTERNAL:
* @see java.util.Vector#hashCode()
*/
public synchronized int hashCode() {
return this.getDelegate().hashCode();
}
/**
* @see java.util.Vector#indexOf(java.lang.Object)
*/
public int indexOf(Object elem) {
return this.getDelegate().indexOf(elem);
}
/**
* @see java.util.Vector#indexOf(java.lang.Object, int)
*/
public synchronized int indexOf(Object elem, int index) {
return this.getDelegate().indexOf(elem, index);
}
/**
* Initialize the instance.
*/
protected void initialize(int initialCapacity, int capacityIncrement) {
this.initialCapacity = initialCapacity;
this.capacityIncrement = capacityIncrement;
this.delegate = null;
this.valueHolder = null;
}
/**
* Initialize the instance.
*/
protected void initialize(Collection c) {
this.delegate = null;
Vector temp = new Vector(c);
this.valueHolder = new ValueHolder(temp);
}
/**
* @see java.util.Vector#insertElementAt(java.lang.Object, int)
*/
public synchronized void insertElementAt(Object obj, int index) {
this.getDelegate().insertElementAt(obj, index);
this.raiseAddChangeEvent(obj);
}
/**
* @see java.util.Vector#isEmpty()
*/
public boolean isEmpty() {
return this.getDelegate().isEmpty();
}
/**
* PUBLIC:
* Return whether the contents have been read from the database.
*/
public boolean isInstantiated() {
return this.getValueHolder().isInstantiated();
}
/**
* @see java.util.AbstractList#iterator()
*/
public Iterator iterator() {
// Must wrap the interator to raise the remove event.
return new Iterator() {
Iterator delegateIterator = IndirectList.this.getDelegate().iterator();
Object currentObject;
public boolean hasNext() {
return this.delegateIterator.hasNext();
}
public Object next() {
this.currentObject = this.delegateIterator.next();
return this.currentObject;
}
public void remove() {
this.delegateIterator.remove();
IndirectList.this.raiseRemoveChangeEvent(this.currentObject);
}
};
}
/**
* @see java.util.Vector#lastElement()
*/
public synchronized Object lastElement() {
return this.getDelegate().lastElement();
}
/**
* @see java.util.Vector#lastIndexOf(java.lang.Object)
*/
public int lastIndexOf(Object elem) {
return this.getDelegate().lastIndexOf(elem);
}
/**
* @see java.util.Vector#lastIndexOf(java.lang.Object, int)
*/
public synchronized int lastIndexOf(Object elem, int index) {
return this.getDelegate().lastIndexOf(elem, index);
}
/**
* @see java.util.AbstractList#listIterator()
*/
public ListIterator listIterator() {
return this.listIterator(0);
}
/**
* @see java.util.AbstractList#listIterator(int)
*/
public ListIterator listIterator(final int index) {
// Must wrap the interator to raise the remove event.
return new ListIterator() {
ListIterator delegateIterator = IndirectList.this.getDelegate().listIterator(index);
Object currentObject;
public boolean hasNext() {
return this.delegateIterator.hasNext();
}
public boolean hasPrevious() {
return this.delegateIterator.hasPrevious();
}
public int previousIndex() {
return this.delegateIterator.previousIndex();
}
public int nextIndex() {
return this.delegateIterator.nextIndex();
}
public Object next() {
this.currentObject = this.delegateIterator.next();
return this.currentObject;
}
public Object previous() {
this.currentObject = this.delegateIterator.previous();
return this.currentObject;
}
public void remove() {
this.delegateIterator.remove();
IndirectList.this.raiseRemoveChangeEvent(this.currentObject);
}
public void set(Object object) {
this.delegateIterator.set(object);
IndirectList.this.raiseRemoveChangeEvent(this.currentObject);
IndirectList.this.raiseAddChangeEvent(object);
}
public void add(Object object) {
this.delegateIterator.add(object);
IndirectList.this.raiseAddChangeEvent(object);
}
};
}
/**
* @see java.util.Vector#remove(int)
*/
public synchronized Object remove(int index) {
Object value = this.getDelegate().remove(index);
this.raiseRemoveChangeEvent(value);
return value;
}
/**
* @see java.util.Vector#remove(java.lang.Object)
*/
public boolean remove(Object o) {
if (this.getDelegate().remove(o)) {
this.raiseRemoveChangeEvent(o);
return true;
}
return false;
}
/**
* @see java.util.Vector#removeAll(java.util.Collection)
*/
public synchronized boolean removeAll(Collection c) {
// Must trigger remove events if tracked or uow.
if (hasBeenRegistered()) {
Iterator objects = c.iterator();
while (objects.hasNext()) {
this.remove(objects.next());
}
return true;
}
return this.getDelegate().removeAll(c);
}
/**
* @see java.util.Vector#removeAllElements()
*/
public synchronized void removeAllElements() {
// Must trigger remove events if tracked or uow.
if (hasBeenRegistered()) {
Iterator objects = this.iterator();
while (objects.hasNext()) {
Object object = objects.next();
objects.remove();
this.raiseRemoveChangeEvent(object);
}
return;
}
this.getDelegate().removeAllElements();
}
/**
* @see java.util.Vector#removeElement(java.lang.Object)
*/
public synchronized boolean removeElement(Object obj) {
return this.remove(obj);
}
/**
* @see java.util.Vector#removeElementAt(int)
*/
public synchronized void removeElementAt(int index) {
this.remove(index);
}
/**
* @see java.util.Vector#retainAll(java.util.Collection)
*/
public synchronized boolean retainAll(Collection c) {
// Must trigger remove events if tracked or uow.
if (hasBeenRegistered()) {
Iterator objects = getDelegate().iterator();
while (objects.hasNext()) {
Object object = objects.next();
if (!c.contains(object)) {
objects.remove();
this.raiseRemoveChangeEvent(object);
}
}
return true;
}
return this.getDelegate().retainAll(c);
}
/**
* @see java.util.Vector#set(int, java.lang.Object)
*/
public synchronized Object set(int index, Object element) {
Object oldValue = this.getDelegate().set(index, element);
this.raiseRemoveChangeEvent(oldValue);
this.raiseAddChangeEvent(element);
return oldValue;
}
/**
* @see java.util.Vector#setElementAt(java.lang.Object, int)
*/
public synchronized void setElementAt(Object obj, int index) {
this.set(index, obj);
}
/**
* @see java.util.Vector#setSize(int)
*/
public synchronized void setSize(int newSize) {
// Must trigger remove events if tracked or uow.
if (hasBeenRegistered()) {
if (newSize > this.size()) {
for (int index = size(); index > newSize; index--) {
this.remove(index - 1);
}
}
}
this.getDelegate().setSize(newSize);
}
/**
* PUBLIC:
* Set the value holder.
*/
public void setValueHolder(ValueHolderInterface valueHolder) {
this.delegate = null;
this.valueHolder = valueHolder;
}
/**
* @see java.util.Vector#size()
*/
public int size() {
return this.getDelegate().size();
}
/**
* @see java.util.Vector#subList(int, int)
*/
public List subList(int fromIndex, int toIndex) {
return this.getDelegate().subList(fromIndex, toIndex);
}
/**
* @see java.util.Vector#toArray()
*/
public synchronized Object[] toArray() {
return this.getDelegate().toArray();
}
/**
* @see java.util.Vector#toArray(java.lang.Object[])
*/
public synchronized Object[] toArray(Object[] a) {
return this.getDelegate().toArray(a);
}
/**
* PUBLIC:
* Use the java.util.Vector#toString(); but wrap it with braces to indicate
* there is a bit of indirection.
* Don't allow this method to trigger a database read.
* @see java.util.Vector#toString()
*/
public String toString() {
if (ValueHolderInterface.shouldToStringInstantiate) {
return this.getDelegate().toString();
}
if (this.isInstantiated()) {
return "{" + this.getDelegate().toString() + "}";
} else {
return "{" + oracle.toplink.essentials.internal.helper.Helper.getShortClassName(this.getClass()) + ": not instantiated}";
}
}
/**
* @see java.util.Vector#trimToSize()
*/
public synchronized void trimToSize() {
this.getDelegate().trimToSize();
}
/**
* Return the mapping attribute name, used to raise change events.
*/
public String getTopLinkAttributeName() {
return attributeName;
}
/**
* Set the mapping attribute name, used to raise change events.
* This is required if the change listener is set.
*/
public void setTopLinkAttributeName(String attributeName) {
this.attributeName = attributeName;
}
}
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