oracle.toplink.essentials.internal.queryframework.ContainerPolicy Maven / Gradle / Ivy
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package oracle.toplink.essentials.internal.queryframework;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.util.Vector;
import java.util.Hashtable;
import java.util.Enumeration;
import java.io.Serializable;
import java.lang.reflect.Constructor;
import java.util.IdentityHashMap;
import oracle.toplink.essentials.internal.helper.Helper;
import oracle.toplink.essentials.internal.helper.ClassConstants;
import oracle.toplink.essentials.internal.helper.IdentityHashtable;
import oracle.toplink.essentials.internal.sessions.CollectionChangeRecord;
import oracle.toplink.essentials.internal.sessions.MergeManager;
import oracle.toplink.essentials.internal.sessions.ObjectChangeSet;
import oracle.toplink.essentials.internal.sessions.UnitOfWorkChangeSet;
import oracle.toplink.essentials.internal.sessions.CollectionChangeRecord;
import oracle.toplink.essentials.queryframework.*;
import oracle.toplink.essentials.exceptions.*;
import oracle.toplink.essentials.internal.security.PrivilegedAccessHelper;
import oracle.toplink.essentials.internal.security.PrivilegedNewInstanceFromClass;
import oracle.toplink.essentials.internal.security.PrivilegedInvokeConstructor;
import oracle.toplink.essentials.internal.security.PrivilegedGetConstructorFor;
import oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl;
import oracle.toplink.essentials.internal.sessions.AbstractSession;
import oracle.toplink.essentials.descriptors.ClassDescriptor;
/**
* Purpose:
* Used to support collections in read queries.
*
*
Responsibilities:
* Map the results into the appropriate collection instance.
* Generically support special collections like cursored stream and virtual collection.
*
* @author James Sutherland
* @since TOPLink/Java 1.2
*/
public abstract class ContainerPolicy implements Cloneable, Serializable {
/** The descriptor is used to wrap and unwrap objects using the wrapper policy. **/
protected transient ClassDescriptor elementDescriptor;
protected transient Constructor constructor;
/**
* Default constructor.
*/
public ContainerPolicy() {
}
/**
* INTERNAL:
* Add element to container however that needs to be done for the type of container.
* Valid for some subclasses only.
* Return whether the container changed.
*/
protected boolean addInto(Object key, Object element, Object container) {
throw QueryException.cannotAddToContainer(element, container, this);
}
/**
* INTERNAL:
* Add element to container.
* This is used to add to a collection independent of JDK 1.1 and 1.2.
* The session may be required to wrap for the wrapper policy.
* Return whether the container changed
*/
public boolean addInto(Object element, Object container, AbstractSession session) {
return addInto(null, element, container, session);
}
/**
* INTERNAL:
* Add element to container.
* This is used to add to a collection independent of JDK 1.1 and 1.2.
* The session may be required to wrap for the wrapper policy.
* Return whether the container changed
*/
public boolean addInto(Object key, Object element, Object container, AbstractSession session) {
Object elementToAdd = element;
if (hasElementDescriptor()) {
elementToAdd = getElementDescriptor().getObjectBuilder().wrapObject(element, session);
}
return addInto(key, elementToAdd, container);
}
/**
* INTERNAL:
* It is illegal to send this message to this receiver. Try one of my subclasses.
* Throws an exception.
*
* @see #ListContainerPolicy
*/
public void addIntoWithOrder(Integer index, Object element, Object container) {
throw QueryException.methodDoesNotExistInContainerClass("set", getContainerClass());
}
/**
* INTERNAL:
* It is illegal to send this message to this receiver. Try one of my subclasses.
* Throws an exception.
*
* @see #ListContainerPolicy
*/
public void addIntoWithOrder(Integer index, Object element, Object container, AbstractSession session) {
Object elementToAdd = element;
if (hasElementDescriptor()) {
elementToAdd = getElementDescriptor().getObjectBuilder().wrapObject(element, session);
}
addIntoWithOrder(index, elementToAdd, container);
}
/**
* INTERNAL:
* It is illegal to send this message to this receiver. Try one of my subclasses.
* Throws an exception.
*
* @see #ListContainerPolicy
*/
public void addIntoWithOrder(Vector indexes, Hashtable elements, Object container, AbstractSession session) {
throw QueryException.methodDoesNotExistInContainerClass("set", getContainerClass());
}
/**
* INTERNAL:
* Return a container populated with the contents of the specified Vector.
*/
public Object buildContainerFromVector(Vector vector, AbstractSession session) {
Object container = containerInstance(vector.size());
for (Enumeration e = vector.elements(); e.hasMoreElements();) {
addInto(e.nextElement(), container, session);
}
return container;
}
/**
* INTERNAL:
* Return the appropriate container policy for the specified
* concrete container class.
*/
public static ContainerPolicy buildPolicyFor(Class concreteContainerClass) {
return buildPolicyFor(concreteContainerClass, false);
}
/**
* INTERNAL:
* Return the appropriate container policy for the specified
* concrete container class.
*/
public static ContainerPolicy buildPolicyFor(Class concreteContainerClass, boolean hasOrdering) {
if (Helper.classImplementsInterface(concreteContainerClass, ClassConstants.List_Class)) {
if (hasOrdering) {
return new OrderedListContainerPolicy(concreteContainerClass);
} else {
return new ListContainerPolicy(concreteContainerClass);
}
} else if (Helper.classImplementsInterface(concreteContainerClass, ClassConstants.SortedSet_Class)) {
return new SortedCollectionContainerPolicy(concreteContainerClass);
} else if (Helper.classImplementsInterface(concreteContainerClass, ClassConstants.Collection_Class)) {
return new CollectionContainerPolicy(concreteContainerClass);
} else if (Helper.classImplementsInterface(concreteContainerClass, ClassConstants.Map_Class)) {
return new MapContainerPolicy(concreteContainerClass);
}
throw ValidationException.illegalContainerClass(concreteContainerClass);
}
/**
* INTERNAL:
* Remove all the elements from the specified container.
* Valid only for certain subclasses.
*/
public void clear(Object container) {
throw QueryException.methodNotValid(this, "clear(Object container)");
}
public Object clone() {
try {
return super.clone();
} catch (CloneNotSupportedException e) {
throw new InternalError();
}
}
public ContainerPolicy clone(ReadQuery query) {
return (ContainerPolicy)clone();
}
/**
* INTERNAL:
* Return a clone of the specified container. Can only be called for select subclasses.
*/
public Object cloneFor(Object container) {
throw QueryException.cannotCreateClone(this, container);
}
/**
* INTERNAL:
* This method is used to calculate the differences between two collections.
*/
public void compareCollectionsForChange(Object oldCollection, Object newCollection, CollectionChangeRecord changeRecord, AbstractSession session, ClassDescriptor referenceDescriptor) {
// 2612538 - the default size of IdentityHashtable (32) is appropriate
IdentityHashMap originalKeyValues = new IdentityHashMap();
IdentityHashMap cloneKeyValues = new IdentityHashMap();
// Collect the values from the oldCollection.
if (oldCollection != null) {
Object backUpIter = iteratorFor(oldCollection);
while (hasNext(backUpIter)) {
Object secondObject = next(backUpIter, session);
// CR2378 null check to prevent a null pointer exception - XC
if (secondObject != null) {
originalKeyValues.put(secondObject, secondObject);
}
}
}
if (newCollection != null){
// Collect the objects from the new Collection.
Object cloneIter = iteratorFor(newCollection);
while (hasNext(cloneIter)) {
Object firstObject = next(cloneIter, session);
// CR2378 null check to prevent a null pointer exception - XC
// If value is null then nothing can be done with it.
if (firstObject != null) {
if (originalKeyValues.containsKey(firstObject)) {
// There is an original in the cache
if ((compareKeys(firstObject, session))) {
// The keys have not changed
originalKeyValues.remove(firstObject);
} else {
// The keys have changed, create a changeSet
// (it will be resused later) and set the old key
// value to be used to remove.
Object backUpVersion = null;
// CR4172 compare the keys from the back up to the
// clone not from the original to the clone.
if (((UnitOfWorkImpl)session).isClassReadOnly(firstObject.getClass())) {
backUpVersion = ((UnitOfWorkImpl)session).getOriginalVersionOfObject(firstObject);
} else {
backUpVersion = ((UnitOfWorkImpl)session).getBackupClone(firstObject);
}
ObjectChangeSet changeSet = referenceDescriptor.getObjectBuilder().createObjectChangeSet(firstObject, (UnitOfWorkChangeSet) changeRecord.getOwner().getUOWChangeSet(), session);
changeSet.setOldKey(keyFrom(backUpVersion, session));
changeSet.setNewKey(keyFrom(firstObject, session));
cloneKeyValues.put(firstObject, firstObject);
}
} else {
// Place it in the add collection
cloneKeyValues.put(firstObject, firstObject);
}
}
}
}
changeRecord.addAdditionChange(cloneKeyValues, (UnitOfWorkChangeSet) changeRecord.getOwner().getUOWChangeSet(), session);
changeRecord.addRemoveChange(originalKeyValues, (UnitOfWorkChangeSet) changeRecord.getOwner().getUOWChangeSet(), session);
}
/**
* INTERNAL:
* Return true if keys are the same in the source as the backup. False otherwise
* in the case of readonly compare against the original
* For non map container policies return true always, because these policies have no concepts of Keys
*/
public boolean compareKeys(Object sourceKey, AbstractSession session) {
return true;
}
/**
* INTERNAL:
* Build a new container, add the contents of each of the specified containers
* to it, and return it.
* Both of the containers must use the same container policy (namely, this one).
*/
public Object concatenateContainers(Object firstContainer, Object secondContainer) {
Object container = containerInstance(sizeFor(firstContainer) + sizeFor(secondContainer));
for (Object firstIter = iteratorFor(firstContainer); hasNext(firstIter);) {
addInto(null, next(firstIter), container);
}
for (Object secondIter = iteratorFor(secondContainer); hasNext(secondIter);) {
addInto(null, next(secondIter), container);
}
return container;
}
/**
* INTERNAL:
* Return an instance of the container class.
* Null should never be returned.
* A ValidationException is thrown on error.
*/
public Object containerInstance() {
try {
if (PrivilegedAccessHelper.shouldUsePrivilegedAccess()){
try {
return AccessController.doPrivileged(new PrivilegedNewInstanceFromClass(getContainerClass()));
} catch (PrivilegedActionException exception) {
throw QueryException.couldNotInstantiateContainerClass(getContainerClass(), exception.getException());
}
} else {
return PrivilegedAccessHelper.newInstanceFromClass(getContainerClass());
}
} catch (Exception ex) {
throw QueryException.couldNotInstantiateContainerClass(getContainerClass(), ex);
}
}
/**
* INTERNAL:
* Return an instance of the container class with the specified initial capacity.
* Null should never be returned.
* A ValidationException is thrown on error.
*/
public Object containerInstance(int initialCapacity) {
if (getConstructor() == null) {
return containerInstance();
}
try {
Object[] arguments = new Object[1];
//Code change for 3732. No longer need to add 1 as this was for JDK 1.1
arguments[0] = new Integer(initialCapacity);
if (PrivilegedAccessHelper.shouldUsePrivilegedAccess()){
try {
return AccessController.doPrivileged(new PrivilegedInvokeConstructor(getConstructor(), arguments));
} catch (PrivilegedActionException exception) {
throw QueryException.couldNotInstantiateContainerClass(getContainerClass(), exception.getException());
}
} else {
return PrivilegedAccessHelper.invokeConstructor(getConstructor(), arguments);
}
} catch (Exception ex) {
throw QueryException.couldNotInstantiateContainerClass(getContainerClass(), ex);
}
}
/**
* INTERNAL:
* Return whether element exists in container.
*/
protected boolean contains(Object element, Object container) {
throw QueryException.methodNotValid(this, "contains(Object element, Object container)");
}
/**
* INTERNAL:
* Check if the object is contained in the collection.
* This is used to check contains in a collection independent of JDK 1.1 and 1.2.
* The session may be required to unwrap for the wrapper policy.
*/
public boolean contains(Object element, Object container, AbstractSession session) {
if (hasElementDescriptor() && getElementDescriptor().hasWrapperPolicy()) {
// The wrapper for the object must be removed.
Object iterator = iteratorFor(container);
while (hasNext(iterator)) {
Object next = next(iterator);
if (getElementDescriptor().getObjectBuilder().unwrapObject(next, session).equals(element)) {
return true;
}
}
return false;
} else {
return contains(element, container);
}
}
/**
* INTERNAL:
* Return whether element exists in container.
*/
protected boolean containsKey(Object element, Object container) {
throw QueryException.methodNotValid(this, "containsKey(Object element, Object container)");
}
/**
* INTERNAL:
* Convert all the class-name-based settings in this ContainerPolicy to actual class-based
* settings
* This method is implemented by subclasses as necessary.
* @param classLoader
*/
public void convertClassNamesToClasses(ClassLoader classLoader){};
/**
* INTERNAL:
* This can be used by collection such as cursored stream to gain control over execution.
*/
public Object execute() {
throw QueryException.methodNotValid(this, "execute()");
}
/**
* INTERNAL:
* Return the size constructor if available.
*/
protected Constructor getConstructor() {
return constructor;
}
/**
* INTERNAL:
* Return the class used for the container.
*/
public Class getContainerClass() {
throw QueryException.methodNotValid(this, "getContainerClass()");
}
/**
* INTERNAL:
* Used by the MW
*/
public String getContainerClassName() {
throw QueryException.methodNotValid(this, "getContainerClassName()");
}
/**
* INTERNAL:
* Used for wrapping and unwrapping with the wrapper policy.
*/
public ClassDescriptor getElementDescriptor() {
return elementDescriptor;
}
/**
* INTERNAL:
* Used for wrapping and unwrapping with the wrapper policy.
*/
public boolean hasElementDescriptor() {
return getElementDescriptor() != null;
}
/**
* INTERNAL:
* Return whether the iterator has more objects.
* The iterator is the one returned from #iteratorFor().
* Valid for some subclasses only.
*
* @see ContainerPolicy#iteratorFor(java.lang.Object)
*/
public abstract boolean hasNext(Object iterator);
/**
* INTERNAL:
* Returns true if the collection has order
*/
public boolean hasOrder() {
return false;
}
/**
* INTERNAL:
* Find the size constructor.
* Providing a size is important for performance.
*/
public void initializeConstructor() {
try {
Constructor constructor = null;
if (PrivilegedAccessHelper.shouldUsePrivilegedAccess()){
try {
constructor = (Constructor)AccessController.doPrivileged(new PrivilegedGetConstructorFor(getContainerClass(), new Class[] { ClassConstants.PINT }, false));
} catch (PrivilegedActionException exception) {
// If there is no constructor then the default will be used.
return;
}
} else {
constructor = PrivilegedAccessHelper.getConstructorFor(getContainerClass(), new Class[] { ClassConstants.PINT }, false);
}
setConstructor(constructor);
} catch (Exception exception) {
// If there is no constructor then the default will be used.
return;
}
}
public boolean isCollectionPolicy() {
return false;
}
/**
* Is this a Cursored stream?
*
*/
public boolean isCursoredStreamPolicy() {
return false;
}
public boolean isCursorPolicy() {
return false;
}
public boolean isCursorStreamPolicy() {
return false;
}
public boolean isDirectMapPolicy() {
return false;
}
/**
* INTERNAL:
* Return whether the container is empty.
*/
public boolean isEmpty(Object container) {
return sizeFor(container) == 0;
}
public boolean isListPolicy() {
return false;
}
public boolean isMapPolicy() {
return false;
}
public boolean isScrollableCursorPolicy() {
return false;
}
/**
* INTERNAL:
* Return whether the specified object is of a valid container type.
*
* @see oracle.toplink.essentials.internal.queryframework.CollectionContainerPolicy#isValidContainer(Object)
* @see oracle.toplink.essentials.internal.queryframework.MapContainerPolicy#isValidContainer(Object)
*/
public boolean isValidContainer(Object container) {
throw QueryException.methodNotValid(this, "isValidContainer(Object container)");
}
/**
* INTERNAL:
* Return whether the specified type is a valid container type.
*/
public boolean isValidContainerType(Class containerType) {
throw QueryException.methodNotValid(this, "isValidContainerType(Class containerType)");
}
/**
* INTERNAL:
* Return an iterator for the given container.
* This iterator can then be used as a parameter to #hasNext()
* and #next().
*
* @see ContainerPolicy#hasNext(java.lang.Object)
* @see ContainerPolicy#next(java.lang.Object)
*/
public abstract Object iteratorFor(Object container);
/**
* INTERNAL:
* Return the key for the specified element.
*
* @param element java.lang.Object
* @return java.lang.Object
*/
public Object keyFrom(Object element, AbstractSession session) {
return null;
}
/**
* INTERNAL:
* Merge changes from the source to the target object. Because this is a
* collection mapping, values are added to or removed from the collection
* based on the change set.
*/
public Object mergeCascadeParts(ObjectChangeSet objectChanges, MergeManager mergeManager, AbstractSession parentSession) {
Object object = null;
if (mergeManager.shouldMergeChangesIntoDistributedCache()) {
// CR 2855 - Try to find the object first we may have merged it already.
object = objectChanges.getTargetVersionOfSourceObject(parentSession);
if ((object == null) && (objectChanges.isNew() || objectChanges.isAggregate()) && objectChanges.containsChangesFromSynchronization()) {
if (!mergeManager.getObjectsAlreadyMerged().containsKey(objectChanges)) {
// CR 2855 - If we haven't merged this object already then
// build a new object otherwise leave it as null which will
// stop the recursion.
// CR 3424 - Need to build the right instance based on
// class type instead of referenceDescriptor.
Class objectClass = objectChanges.getClassType(mergeManager.getSession());
object = mergeManager.getSession().getDescriptor(objectClass).getObjectBuilder().buildNewInstance();
// Store the change set to prevent us from creating this new object again.
mergeManager.getObjectsAlreadyMerged().put(objectChanges, object);
} else {
// CR 4012 - We have all ready created the object, must be
// in a cyclic merge on a new object so get it out of the
// already merged collection
object = mergeManager.getObjectsAlreadyMerged().get(objectChanges);
}
} else {
object = objectChanges.getTargetVersionOfSourceObject(parentSession, true);
}
if (objectChanges.containsChangesFromSynchronization()) {
mergeManager.mergeChanges(object, objectChanges);
}
} else {
mergeManager.mergeChanges(objectChanges.getUnitOfWorkClone(), objectChanges);
}
return object;
}
/**
* INTERNAL:
* Merge changes from the source to the target object. Because this is a
* collection mapping, values are added to or removed from the collection
* based on the change set.
*/
public void mergeChanges(CollectionChangeRecord changeRecord, Object valueOfTarget, boolean shouldMergeCascadeParts, MergeManager mergeManager, AbstractSession parentSession) {
ObjectChangeSet objectChanges;
// Step 1 - iterate over the removed changes and remove them from the container.
Enumeration removeObjects = changeRecord.getRemoveObjectList().keys();
while (removeObjects.hasMoreElements()) {
objectChanges = (ObjectChangeSet) removeObjects.nextElement();
synchronized (valueOfTarget) {
removeFrom(objectChanges.getOldKey(), objectChanges.getTargetVersionOfSourceObject(mergeManager.getSession()), valueOfTarget, parentSession);
}
if (!mergeManager.shouldMergeChangesIntoDistributedCache()) {
mergeManager.registerRemovedNewObjectIfRequired(objectChanges.getUnitOfWorkClone());
}
}
// Step 2 - iterate over the added changes and add them to the container.
Enumeration addObjects = changeRecord.getAddObjectList().keys();
while (addObjects.hasMoreElements()) {
objectChanges = (ObjectChangeSet) addObjects.nextElement();
Object object = null;
if (shouldMergeCascadeParts) {
object = mergeCascadeParts(objectChanges, mergeManager, parentSession);
}
if (object == null) {
// Retrieve the object to be added to the collection.
object = objectChanges.getTargetVersionOfSourceObject(mergeManager.getSession(), false);
}
synchronized (valueOfTarget) {
// I am assuming that at this point the above merge will have created a new object if required
if (mergeManager.shouldMergeChangesIntoDistributedCache()) {
//bug#4458089 and 4454532- check if collection contains new item before adding during merge into distributed cache
if (!contains(object, valueOfTarget, mergeManager.getSession())) {
addInto(objectChanges.getNewKey(), object, valueOfTarget, mergeManager.getSession());
}
} else {
addInto(objectChanges.getNewKey(), object, valueOfTarget, mergeManager.getSession());
}
}
}
}
/**
* INTERNAL:
* Return the next object on the queue. The iterator is the one
* returned from #iteratorFor().
* Valid for some subclasses only.
*
* @see ContainerPolicy#iteratorFor(java.lang.Object)
*/
protected abstract Object next(Object iterator);
/**
* INTERNAL:
* Return the next object from the iterator.
* This is used to stream over a collection independent of JDK 1.1 and 1.2.
* The session may be required to unwrap for the wrapper policy.
*/
public Object next(Object iterator, AbstractSession session) {
Object next = next(iterator);
if (hasElementDescriptor()) {
next = getElementDescriptor().getObjectBuilder().unwrapObject(next, session);
}
return next;
}
/**
* This can be used by collection such as cursored stream to gain control over execution.
*/
public boolean overridesRead() {
return false;
}
/**
* Prepare and validate.
* Allow subclasses to override.
*/
public void prepare(DatabaseQuery query, AbstractSession session) throws QueryException {
if (query.isReadAllQuery() && (!query.isReportQuery()) && query.shouldUseWrapperPolicy()) {
setElementDescriptor(query.getDescriptor());
//make sure DataReadQuery points to this container policy
} else if (query.isDataReadQuery()) {
((DataReadQuery)query).setContainerPolicy(this);
}
}
/**
* Prepare and validate.
* Allow subclasses to override.
*/
public void prepareForExecution() throws QueryException {
}
/**
* This method is used to bridge the behaviour between Attribute Change Tracking and
* deferred change tracking with respect to adding the same instance multiple times.
* Each containerplicy type will implement specific behaviour for the collection
* type it is wrapping. These methods are only valid for collections containing object references
*/
public void recordAddToCollectionInChangeRecord(ObjectChangeSet changeSetToAdd, CollectionChangeRecord collectionChangeRecord){
if (collectionChangeRecord.getRemoveObjectList().containsKey(changeSetToAdd)) {
collectionChangeRecord.getRemoveObjectList().remove(changeSetToAdd);
} else {
collectionChangeRecord.getAddObjectList().put(changeSetToAdd, changeSetToAdd);
}
}
/**
* This method is used to bridge the behaviour between Attribute Change Tracking and
* deferred change tracking with respect to adding the same instance multiple times.
* Each containerplicy type will implement specific behaviour for the collection
* type it is wrapping. These methods are only valid for collections containing object references
*/
public void recordRemoveFromCollectionInChangeRecord(ObjectChangeSet changeSetToRemove, CollectionChangeRecord collectionChangeRecord){
if(collectionChangeRecord.getAddObjectList().containsKey(changeSetToRemove)) {
collectionChangeRecord.getAddObjectList().remove(changeSetToRemove);
} else {
collectionChangeRecord.getRemoveObjectList().put(changeSetToRemove, changeSetToRemove);
}
}
/**
* This can be used by collection such as cursored stream to gain control over execution.
*/
public Object remoteExecute() {
return null;
}
/**
* INTERNAL:
* Remove all the elements from container.
* Valid only for certain subclasses.
*/
public void removeAllElements(Object container) {
clear(container);
}
/**
* INTERNAL:
* Remove element from container.
* Valid for some subclasses only.
*/
protected boolean removeFrom(Object key, Object element, Object container) {
throw QueryException.cannotRemoveFromContainer(element, container, this);
}
/**
* INTERNAL:
* Remove the object from the collection.
* This is used to remove from a collection independent of JDK 1.1 and 1.2.
* The session may be required to unwrap for the wrapper policy.
*/
public boolean removeFrom(Object key, Object element, Object container, AbstractSession session) {
Object objectToRemove = element;
if (hasElementDescriptor() && getElementDescriptor().hasWrapperPolicy()) {
// The wrapper for the object must be removed.
Object iterator = iteratorFor(container);
while (hasNext(iterator)) {
Object next = next(iterator);
if (getElementDescriptor().getObjectBuilder().unwrapObject(next, session).equals(element)) {
objectToRemove = next;
break;
}
}
}
return removeFrom(key, objectToRemove, container);
}
/**
* INTERNAL:
* Remove the object from the collection.
* This is used to remove from a collection independent of JDK 1.1 and 1.2.
* The session may be required to unwrap for the wrapper policy.
*/
public boolean removeFrom(Object element, Object container, AbstractSession session) {
return removeFrom(null, element, container, session);
}
/**
* INTERNAL:
* It is illegal to send this message to this receiver. Try one of my subclasses.
* Throws an exception.
*
* @see #ListContainerPolicy
*/
public void removeFromWithOrder(int beginIndex, Object container) {
throw QueryException.methodDoesNotExistInContainerClass("remove(index)", getContainerClass());
}
/**
* INTERNAL:
* Set the size constructor if available.
*/
protected void setConstructor(Constructor constructor) {
this.constructor = constructor;
}
/**
* INTERNAL:
* Set the class used for the container.
*/
public void setContainerClass(Class containerClass) {
throw QueryException.methodNotValid(this, "getContainerClass()");
}
/**
* INTERNAL:
* Used by the MW
*/
public void setContainerClassName(String containerClassName) {
throw QueryException.methodNotValid(this, "getContainerClassName()");
}
/**
* INTERNAL:
* Used for wrapping and unwrapping with the wrapper policy.
*/
public void setElementDescriptor(ClassDescriptor elementDescriptor) {
this.elementDescriptor = elementDescriptor;
}
/**
* INTERNAL:
* It is illegal to send this message to this receiver. Try one of my
* subclasses. Throws an exception.
*
* @see #MapContainerPolicy
*/
public void setKeyName(String instanceVariableName, String elementClassName) {
throw ValidationException.containerPolicyDoesNotUseKeys(this, instanceVariableName);
}
/**
* INTERNAL:
* Return the size of container.
*/
public int sizeFor(Object container) {
throw QueryException.methodNotValid(this, "sizeFor(Object container)");
}
public String toString() {
return Helper.getShortClassName(this.getClass()) + "(" + toStringInfo() + ")";
}
protected Object toStringInfo() {
return "";
}
/**
* INTERNAL:
* over ride in MapPolicy subclass
*/
public void validateElementAndRehashIfRequired(Object sourceValue, Object target, AbstractSession session, Object targetVersionOfSource) {
//do nothing
}
/**
* INTERNAL:
* Return a Vector populated with the contents of container.
* Added for bug 2766379, must implement a version of vectorFor that
* handles wrapped objects.
*/
public Vector vectorFor(Object container, AbstractSession session) {
Vector result = new Vector(sizeFor(container));
for (Object iter = iteratorFor(container); hasNext(iter);) {
result.addElement(next(iter, session));
}
return result;
}
}