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package oracle.toplink.essentials.internal.queryframework;
import java.util.*;
import oracle.toplink.essentials.exceptions.*;
import oracle.toplink.essentials.indirection.*;
import oracle.toplink.essentials.internal.helper.ClassConstants;
/**
* A ContainerPolicy for jdk1.1 only (IndirectList implements Collection
* in jdk1.2; so the CollectionContainerPolicy can be used.)
*
* @see ContainerPolicy
* @author Big Country
* @since TOPLink/Java 2.5
*/
public class IndirectListContainerPolicy extends InterfaceContainerPolicy {
/**
* INTERNAL:
* Construct a new policy.
*/
public IndirectListContainerPolicy() {
super();
}
/**
* INTERNAL:
* Construct a new policy for the specified class.
* @param containerClass java.lang.Class
*/
public IndirectListContainerPolicy(Class containerClass) {
super(containerClass);
DescriptorException.invalidContainerPolicy(this, containerClass);
}
/**
* INTERNAL:
* Add element into the container.
*
* @param element java.lang.Object
* @param container java.lang.Object
* @return boolean indicating whether the container changed
*/
protected boolean addInto(Object key, Object element, Object container) {
try {
((IndirectList)container).addElement(element);
return true;
} catch (ClassCastException ex) {
throw QueryException.cannotAddElement(element, container, ex);
}
}
/**
* INTERNAL:
* Add element into a container which implements the Collection interface.
*
* @param element java.lang.Object
* @param container java.lang.Object
* @return boolean indicating whether the container changed
*/
public void addIntoWithOrder(Vector indexes, Hashtable elements, Object container) {
Object object = null;
try {
Enumeration indexEnum = indexes.elements();
while (indexEnum.hasMoreElements()) {
Integer index = (Integer)indexEnum.nextElement();
object = elements.get(index);
if (index.intValue() >= (sizeFor(container) - 1)) {
((IndirectList)container).addElement(object);
} else {
((IndirectList)container).setElementAt(object, index.intValue());
}
}
} catch (ClassCastException ex1) {
throw QueryException.cannotAddElement(object, container, ex1);
}
}
/**
* INTERNAL:
* Remove all the elements from container.
*
* @param container java.lang.Object
*/
public void clear(Object container) {
((IndirectList)container).clear();
}
/**
* INTERNAL:
* Return the true if element exists in container.
*
* @param element java.lang.Object
* @param container java.lang.Object
* @return boolean true if container 'contains' element
*/
protected boolean contains(Object element, Object container) {
return ((IndirectList)container).contains(element);
}
public Class getInterfaceType() {
return ClassConstants.IndirectList_Class;
}
/**
* INTERNAL:
* Return whether the iterator has more objects,
*
* @param iterator java.lang.Object
* @return boolean true if iterator has more objects
*/
public boolean hasNext(Object iterator) {
return ((Enumeration)iterator).hasMoreElements();
}
/**
* INTERNAL:
* Returns true if the collection has order
*
* @see ContainerPolicy#iteratorFor(java.lang.Object)
*/
public boolean hasOrder() {
return true;
}
/**
* INTERNAL:
* Return an Iterator for the given container.
*
* @param container java.lang.Object
* @return java.lang.Object the iterator
*/
public Object iteratorFor(Object container) {
return ((IndirectList)container).elements();
}
/**
* INTERNAL:
* Return the next object on the queue.
* Valid for some subclasses only.
*
* @param iterator java.lang.Object
* @return java.lang.Object the next object in the queue
*/
protected Object next(Object iterator) {
return ((Enumeration)iterator).nextElement();
}
/**
* INTERNAL:
* Remove element from container which implements the Collection interface.
*
* @param element java.lang.Object
* @param container java.lang.Object
*/
protected boolean removeFrom(Object key, Object element, Object container) {
return ((IndirectList)container).removeElement(element);
}
/**
* INTERNAL:
* Remove elements from this container starting with this index
*
* @param beginIndex int the point to start deleting values from the collection
* @param container java.lang.Object
* @return boolean indicating whether the container changed
*/
public void removeFromWithOrder(int beginIndex, Object container) {
int size = sizeFor(container) - 1;
try {
for (; size >= beginIndex; --size) {
((IndirectList)container).removeElementAt(size);
}
} catch (ClassCastException ex1) {
throw QueryException.cannotRemoveFromContainer(new Integer(size), container, this);
}
}
/**
* INTERNAL:
* Return the size of container.
*
* @param anObject java.lang.Object
* @return int The size of the container.
*/
public int sizeFor(Object container) {
return ((IndirectList)container).size();
}
}
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