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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.openjpa.kernel;
import java.lang.reflect.Field;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import org.apache.openjpa.enhance.PersistenceCapable;
import org.apache.openjpa.enhance.Reflection;
import org.apache.openjpa.enhance.StateManager;
import org.apache.openjpa.event.LifecycleEvent;
import org.apache.openjpa.lib.util.Localizer;
import org.apache.openjpa.meta.ClassMetaData;
import org.apache.openjpa.meta.FieldMetaData;
import org.apache.openjpa.meta.JavaTypes;
import org.apache.openjpa.meta.ValueMetaData;
import org.apache.openjpa.meta.ValueStrategies;
import org.apache.openjpa.util.ApplicationIds;
import org.apache.openjpa.util.ImplHelper;
import org.apache.openjpa.util.ObjectNotFoundException;
import org.apache.openjpa.util.OptimisticException;
/**
* Handles attaching instances using version and primary key fields.
*
* @nojavadoc
* @author Steve Kim
*/
class VersionAttachStrategy
extends AttachStrategy
implements DetachState {
private static final Localizer _loc = Localizer.forPackage
(VersionAttachStrategy.class);
protected Object getDetachedObjectId(AttachManager manager,
Object toAttach) {
Broker broker = manager.getBroker();
ClassMetaData meta = broker.getConfiguration().
getMetaDataRepositoryInstance().getMetaData(
ImplHelper.getManagedInstance(toAttach).getClass(),
broker.getClassLoader(), true);
return ApplicationIds.create(ImplHelper.toPersistenceCapable(toAttach,
broker.getConfiguration()),
meta);
}
protected void provideField(Object toAttach, StateManagerImpl sm,
int field) {
sm.provideField(ImplHelper.toPersistenceCapable(toAttach,
sm.getContext().getConfiguration()), this, field);
}
public Object attach(AttachManager manager, Object toAttach,
ClassMetaData meta, PersistenceCapable into, OpenJPAStateManager owner,
ValueMetaData ownerMeta, boolean explicit) {
BrokerImpl broker = manager.getBroker();
PersistenceCapable pc = ImplHelper.toPersistenceCapable(toAttach,
meta.getRepository().getConfiguration());
boolean embedded = ownerMeta != null && ownerMeta.isEmbeddedPC();
boolean isNew = !broker.isDetached(pc);
Object version = null;
StateManagerImpl sm;
// if the state manager for the embedded instance is null, then
// it should be treated as a new instance (since the
// newly persisted owner may create a new embedded instance
// in the constructor); fixed bug #1075.
// also, if the user has attached a detached obj from somewhere
// else in the graph to an embedded field that was previously null,
// copy into a new embedded instance
if (embedded && (isNew || into == null
|| broker.getStateManager(into) == null)) {
if (into == null)
into = pc.pcNewInstance(null, false);
sm = (StateManagerImpl) broker.embed(into, null, owner, ownerMeta);
into = sm.getPersistenceCapable();
} else if (isNew) {
Object oid = null;
if (!isPrimaryKeysGenerated(meta))
oid = ApplicationIds.create(pc, meta);
sm = persist(manager, pc, meta, oid, explicit);
into = sm.getPersistenceCapable();
} else if (!embedded && into == null) {
Object id = getDetachedObjectId(manager, toAttach);
if (id != null)
into =
ImplHelper.toPersistenceCapable(broker.find(id, true, null),
broker.getConfiguration());
if (into == null)
throw new OptimisticException(_loc.get("attach-version-del",
ImplHelper.getManagedInstance(pc).getClass(), id, version))
.setFailedObject(toAttach);
sm = manager.assertManaged(into);
if (meta.getDescribedType()
!= sm.getMetaData().getDescribedType()) {
throw new ObjectNotFoundException(_loc.get
("attach-wrongclass", id, toAttach.getClass(),
sm.getMetaData().getDescribedType())).
setFailedObject(toAttach);
}
} else
sm = manager.assertManaged(into);
// mark that we attached the instance *before* we
// fill in values to avoid endless recursion
manager.setAttachedCopy(toAttach, into);
// if persisting in place, just attach field values
if (pc == into) {
attachFieldsInPlace(manager, sm);
return into;
}
if (isNew) {
broker.fireLifecycleEvent(toAttach, null, meta,
LifecycleEvent.BEFORE_PERSIST);
} else {
// invoke any preAttach on the detached instance
manager.fireBeforeAttach(toAttach, meta);
}
// assign the detached pc the same state manager as the object we're
// copying into during the attach process
StateManager smBefore = pc.pcGetStateManager();
pc.pcReplaceStateManager(sm);
int detach = (isNew) ? DETACH_ALL : broker.getDetachState();
FetchConfiguration fetch = broker.getFetchConfiguration();
try {
FieldMetaData[] fmds = sm.getMetaData().getFields();
for (int i = 0; i < fmds.length; i++) {
switch (detach) {
case DETACH_ALL:
attachField(manager, toAttach, sm, fmds[i], true);
break;
case DETACH_FETCH_GROUPS:
if (fetch.requiresFetch(fmds[i])
!= FetchConfiguration.FETCH_NONE)
attachField(manager, toAttach, sm, fmds[i], true);
break;
case DETACH_LOADED:
attachField(manager, toAttach, sm, fmds[i], false);
break;
}
}
} finally {
pc.pcReplaceStateManager(smBefore);
}
if (!embedded && !isNew)
compareVersion(sm, pc);
return ImplHelper.getManagedInstance(into);
}
/**
* Make sure the version information is correct in the detached object.
*/
private void compareVersion(StateManagerImpl sm, PersistenceCapable pc) {
Object version = pc.pcGetVersion();
// In the event that the version field is a primitive and it is the types default value, we can't differentiate
// between a value that was set to be the default, and one that defaulted to that value.
if (version != null
&& JavaTypes.isPrimitiveDefault(version, sm.getMetaData().getVersionField().getTypeCode())) {
Field pcVersionInitField = null;
try {
pcVersionInitField = pc.getClass().getDeclaredField("pcVersionInit");
Object pcField = Reflection.get(pc, pcVersionInitField);
if (pcField != null) {
boolean bool = (Boolean) pcField;
if (bool == false) {
// If this field if false, that means that the pcGetVersion returned a default value rather than
// and actual value.
version = null;
}
}
} catch (Exception e) {
// Perhaps this is an Entity that was enhanced before the pcVersionInit field was added.
}
}
if (version == null) {
return;
}
// don't need to load unloaded fields since its implicitly
// a single field value
StoreManager store = sm.getBroker().getStoreManager();
switch (store.compareVersion(sm, version, sm.getVersion())) {
case StoreManager.VERSION_LATER:
// we have a later version: set it into the object.
// lock validation will occur at commit time
sm.setVersion(version);
break;
case StoreManager.VERSION_EARLIER:
case StoreManager.VERSION_DIFFERENT:
sm.setVersion(version);
throw new OptimisticException(sm.getManagedInstance());
case StoreManager.VERSION_SAME:
// no action required
break;
}
}
/**
* Attach the fields of an in-place persisted instance.
*/
private void attachFieldsInPlace(AttachManager manager,
StateManagerImpl sm) {
FieldMetaData[] fmds = sm.getMetaData().getFields();
for (int i = 0; i < fmds.length; i++) {
if (fmds[i].getManagement() != FieldMetaData.MANAGE_PERSISTENT)
continue;
Object cur, attached;
switch (fmds[i].getDeclaredTypeCode()) {
case JavaTypes.PC:
case JavaTypes.PC_UNTYPED:
cur = sm.fetchObjectField(i);
attached = attachInPlace(manager, sm, fmds[i], cur);
break;
case JavaTypes.ARRAY:
if (!fmds[i].getElement().isDeclaredTypePC())
continue;
cur = sm.fetchObjectField(i);
attached =
attachInPlace(manager, sm, fmds[i], (Object[]) cur);
break;
case JavaTypes.COLLECTION:
if (!fmds[i].getElement().isDeclaredTypePC())
continue;
cur = sm.fetchObjectField(i);
attached = attachInPlace(manager, sm, fmds[i],
(Collection) cur);
break;
case JavaTypes.MAP:
if (!fmds[i].getElement().isDeclaredTypePC()
&& !fmds[i].getKey().isDeclaredTypePC())
continue;
cur = sm.fetchObjectField(i);
attached = attachInPlace(manager, sm, fmds[i], (Map) cur);
break;
default:
continue;
}
if (cur != attached)
sm.settingObjectField(sm.getPersistenceCapable(), i,
cur, attached, StateManager.SET_REMOTE);
}
}
/**
* Attach the given pc.
*/
private Object attachInPlace(AttachManager manager, StateManagerImpl sm,
ValueMetaData vmd, Object pc) {
if (pc == null)
return null;
Object attached = manager.getAttachedCopy(pc);
if (attached != null)
return attached;
OpenJPAStateManager into = manager.getBroker().getStateManager(pc);
PersistenceCapable intoPC = (into == null) ? null
: into.getPersistenceCapable();
if (vmd.isEmbedded())
return manager.attach(pc, intoPC, sm, vmd, false);
return manager.attach(pc, intoPC, null, null, false);
}
/**
* Attach the given array.
*/
private Object[] attachInPlace(AttachManager manager, StateManagerImpl sm,
FieldMetaData fmd, Object[] arr) {
if (arr == null)
return null;
for (int i = 0; i < arr.length; i++)
arr[i] = attachInPlace(manager, sm, fmd.getElement(), arr[i]);
return arr;
}
/**
* Attach the given collection.
*/
private Collection attachInPlace(AttachManager manager,
StateManagerImpl sm, FieldMetaData fmd, Collection coll) {
if (coll == null || coll.isEmpty())
return coll;
// copy if elements embedded or contains detached, which will mean
// we'll have to copy the existing elements
Collection copy = null;
if (fmd.getElement().isEmbedded())
copy = (Collection) sm.newFieldProxy(fmd.getIndex());
else {
for (Iterator itr = coll.iterator(); itr.hasNext();) {
if (manager.getBroker().isDetached(itr.next())) {
copy = (Collection) sm.newFieldProxy(fmd.getIndex());
break;
}
}
}
Object attached;
for (Iterator itr = coll.iterator(); itr.hasNext();) {
attached = attachInPlace(manager, sm, fmd.getElement(),
itr.next());
if (copy != null)
copy.add(attached);
}
return (copy == null) ? coll : copy;
}
/**
* Attach the given map.
*/
private Map attachInPlace(AttachManager manager, StateManagerImpl sm,
FieldMetaData fmd, Map map) {
if (map == null || map.isEmpty())
return map;
Map copy = null;
Map.Entry entry;
boolean keyPC = fmd.getKey().isDeclaredTypePC();
boolean valPC = fmd.getElement().isDeclaredTypePC();
// copy if embedded pcs or detached pcs, which will require us to
// copy elements
if (fmd.getKey().isEmbeddedPC() || fmd.getElement().isEmbeddedPC())
copy = (Map) sm.newFieldProxy(fmd.getIndex());
else {
for (Iterator itr = map.entrySet().iterator(); itr.hasNext();) {
entry = (Map.Entry) itr.next();
if ((keyPC && manager.getBroker().isDetached(entry.getKey()))
|| (valPC && manager.getBroker().isDetached
(entry.getValue()))) {
copy = (Map) sm.newFieldProxy(fmd.getIndex());
break;
}
}
}
Object key, val;
for (Iterator itr = map.entrySet().iterator(); itr.hasNext();) {
entry = (Map.Entry) itr.next();
key = entry.getKey();
if (keyPC)
key = attachInPlace(manager, sm, fmd.getKey(), key);
val = entry.getValue();
if (valPC)
val = attachInPlace(manager, sm, fmd.getElement(), val);
if (copy != null)
copy.put(key, val);
}
return (copy == null) ? map : copy;
}
/**
* Find a PersistenceCapable instance of an Object if it exists in the
* database. If the object is null or can't be found in the database.
*
* @param pc An object which will be attached into the current context. The
* object may or may not correspond to a row in the database.
*
* @return If the object is null or can't be found in the database this
* method returns null. Otherwise a PersistenceCapable representation of the
* object is returned.
*/
protected PersistenceCapable findFromDatabase(AttachManager manager,
Object pc) {
Object oid = manager.getBroker().newObjectId(pc.getClass(),
manager.getDetachedObjectId(pc));
if (oid != null) {
return ImplHelper.toPersistenceCapable(
manager.getBroker().find(oid, true, null),
manager.getBroker().getConfiguration());
} else {
return null;
}
}
private boolean isPrimaryKeysGenerated(ClassMetaData meta) {
FieldMetaData[] pks = meta.getPrimaryKeyFields();
for (int i = 0; i < pks.length; i++) {
if (pks[i].getValueStrategy() != ValueStrategies.NONE)
return true;
}
return false;
}
}
