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/**
* <copyright>
*
* Copyright (c) 2009 Springsite BV (The Netherlands) and others
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Martin Taal - Initial API and implementation
*
* </copyright>
*
* $Id: PersistentStoreAdapter.java,v 1.15 2011/02/21 04:43:18 mtaal Exp $
*/
package org.eclipse.emf.teneo.type;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.eclipse.emf.common.notify.Adapter;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.common.notify.Notifier;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.emf.teneo.util.StoreUtil;
/**
* Keeps a list of PersistentLists by efeature. Is used when a new object is persisted and the
* OR-layer wants to replace the list implementation.
*
* This adapter keeps the PersistentList and ensures that any updates in the original list are also
* done in the persistent store.
*
* This adapter only operates in case the target object is not read from the persistent store but is
* persisted there for the first time.
*
* @author <a href="mailto:mtaal@elver.org">Martin Taal</a>
* @version $Revision: 1.15 $
*/
public class PersistentStoreAdapter implements Adapter {
private static final long serialVersionUID = 1L;
private Notifier target;
private boolean targetCreatedByORM;
private Map<EStructuralFeature, Object> storeCollections = new HashMap<EStructuralFeature, Object>();
private Map<String, Object> syntheticProperties = new HashMap<String, Object>();
public void addStoreCollection(EStructuralFeature eFeature, Object storeCollection) {
// note that when refresh is called on a persisted object
// then this call replaces the current collection
storeCollections.put(eFeature, storeCollection);
}
public Object getStoreCollection(EStructuralFeature eFeature) {
return storeCollections.get(eFeature);
}
/*
* (non-Javadoc)
*
* @see org.eclipse.emf.common.notify.Adapter#getTarget()
*/
public Notifier getTarget() {
return target;
}
/*
* (non-Javadoc)
*
* @see org.eclipse.emf.common.notify.Adapter#isAdapterForType(java.lang.Object)
*/
public boolean isAdapterForType(Object type) {
return false;
}
/*
* (non-Javadoc)
*
* @see org.eclipse.emf.common.notify.Adapter#notifyChanged(org.eclipse.emf.common
* .notify.Notification)
*/
@SuppressWarnings("unchecked")
public void notifyChanged(Notification notification) {
final EStructuralFeature eFeature = (EStructuralFeature) notification.getFeature();
final Object collectionObject = storeCollections.get(eFeature);
if (collectionObject == null) {
return;
}
final List<Object> list = (collectionObject instanceof List ? (List<Object>) collectionObject
: null);
final Map<Object, Object> map = (collectionObject instanceof Map<?, ?> ? (Map<Object, Object>) collectionObject
: null);
final boolean isEReference = eFeature instanceof EReference;
int changedPosition = -1;
switch (notification.getEventType()) {
case Notification.ADD:
if (list != null) {
if (notification.getPosition() != Notification.NO_INDEX) {
changedPosition = notification.getPosition();
list.add(notification.getPosition(), replaceValue(notification.getNewValue(), eFeature));
} else {
changedPosition = list.size();
list.add(replaceValue(notification.getNewValue(), eFeature));
}
}
if (map != null) {
final Map.Entry<?, ?> entry = (Map.Entry<?, ?>) notification.getNewValue();
map.put(entry.getKey(), entry.getValue());
}
break;
case Notification.ADD_MANY:
if (list != null) {
if (notification.getPosition() != Notification.NO_INDEX) {
changedPosition = notification.getPosition();
list.addAll(notification.getPosition(),
replaceValues((List<Object>) notification.getNewValue(), eFeature));
} else {
changedPosition = list.size();
list.addAll(replaceValues((List<Object>) notification.getNewValue(), eFeature));
}
}
if (map != null) {
for (Object o : (List<?>) notification.getNewValue()) {
final Map.Entry<?, ?> entry = (Map.Entry<?, ?>) o;
map.put(entry.getKey(), entry.getValue());
}
}
break;
case Notification.REMOVE:
if (list != null) {
final Object removed;
if (notification.getPosition() != Notification.NO_INDEX) {
removed = list.remove(notification.getPosition());
} else {
removed = replaceValue(notification.getOldValue(), eFeature);
list.remove(removed);
}
// recompute them all
changedPosition = 0;
if (isEReference) {
StoreUtil.resetSyntheticListInfo(eFeature, removed);
}
}
if (map != null) {
final Map.Entry<?, ?> entry = (Map.Entry<?, ?>) notification.getOldValue();
map.remove(entry.getKey());
}
break;
case Notification.REMOVE_MANY:
if (list != null) {
final List<?> removed = replaceValues((List<Object>) notification.getOldValue(), eFeature);
list.removeAll(removed);
if (isEReference) {
for (Object removedObject : removed) {
StoreUtil.resetSyntheticListInfo(eFeature, removedObject);
}
}
changedPosition = 0;
}
if (map != null) {
for (Object o : (List<?>) notification.getOldValue()) {
final Map.Entry<?, ?> entry = (Map.Entry<?, ?>) o;
map.remove(entry.getKey());
}
}
break;
case Notification.MOVE:
if (list != null) {
final int oldPosition = (Integer) notification.getOldValue();
final int newPosition = notification.getPosition();
final Object o = list.remove(oldPosition);
if (o != notification.getNewValue()) {
throw new IllegalStateException("Persistent list and EList are out of sync");
}
list.add(newPosition, o);
if (newPosition < oldPosition) {
changedPosition = newPosition;
} else {
changedPosition = oldPosition;
}
}
break;
case Notification.SET:
if (list != null) {
final int position = notification.getPosition();
Object removed = list.set(position, replaceValue(notification.getNewValue(), eFeature));
changedPosition = position;
if (isEReference) {
StoreUtil.resetSyntheticListInfo(eFeature, removed);
}
}
break;
}
if (changedPosition > -1 && isEReference) {
int newIndex = changedPosition;
for (Object element : list.subList(changedPosition, list.size())) {
StoreUtil.setSyntheticListOwner(eFeature, element, notification.getNotifier());
StoreUtil.setSyntheticListIndex(eFeature, element, newIndex++);
}
}
}
/*
* (non-Javadoc)
*
* @see org.eclipse.emf.common.notify.Adapter#setTarget(org.eclipse.emf.common .notify.Notifier)
*/
public void setTarget(Notifier newTarget) {
target = newTarget;
}
/**
* @return the targetCreatedByORM
*/
public boolean isTargetCreatedByORM() {
return targetCreatedByORM;
}
/**
* @param targetCreatedByORM
* the targetCreatedByORM to set
*/
public void setTargetCreatedByORM(boolean targetCreatedByORM) {
this.targetCreatedByORM = targetCreatedByORM;
}
/**
* @return the storeCollections
*/
public Map<EStructuralFeature, Object> getStoreCollections() {
return storeCollections;
}
protected Object replaceValue(Object value, EStructuralFeature eFeature) {
return value;
}
protected List<Object> replaceValues(List<Object> values, EStructuralFeature eFeature) {
return values;
}
public Object getSyntheticProperty(String property) {
return syntheticProperties.get(property);
}
public void setSyntheticProperty(String property, Object value) {
syntheticProperties.put(property, value);
}
}
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