/*******************************************************************************
* Copyright (c) 1998, 2013 Oracle and/or its affiliates. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Oracle - initial API and implementation from Oracle TopLink
******************************************************************************/
package org.eclipse.persistence.internal.indirection;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.*;
import org.eclipse.persistence.queries.*;
import org.eclipse.persistence.sessions.remote.*;
import org.eclipse.persistence.descriptors.changetracking.ChangeTracker;
import org.eclipse.persistence.exceptions.*;
import org.eclipse.persistence.indirection.ValueHolderInterface;
import org.eclipse.persistence.internal.queries.InterfaceContainerPolicy;
import org.eclipse.persistence.internal.sessions.remote.*;
import org.eclipse.persistence.internal.sessions.AbstractRecord;
import org.eclipse.persistence.internal.sessions.AbstractSession;
import org.eclipse.persistence.internal.sessions.UnitOfWorkImpl;
import org.eclipse.persistence.internal.helper.*;
import org.eclipse.persistence.internal.identitymaps.CacheKey;
/**
* <h2>Purpose</h2>:
* NoIndirectionPolicy implements the behavior necessary for a
* a ForeignReferenceMapping (or TransformationMapping) to
* directly use domain objects, as opposed to ValueHolders.
*
* @see ForeignReferenceMapping
* @author Mike Norman
* @since TOPLink/Java 2.5
*/
public class NoIndirectionPolicy extends IndirectionPolicy {
/**
* INTERNAL:
* Construct a new indirection policy.
*/
public NoIndirectionPolicy() {
super();
}
/**
* INTERNAL: This method can be used when an Indirection Object is required
* to be built from a provided ValueHolderInterface object. This may be used
* for custom value holder types. Certain policies like the
* TransparentIndirectionPolicy may wrap the valueholder in another object.
*/
public Object buildIndirectObject(ValueHolderInterface valueHolder){
return valueHolder.getValue();
}
/**
* INTERNAL:
* Return a clone of the attribute.
* @param buildDirectlyFromRow indicates that we are building the clone directly
* from a row as opposed to building the original from the row, putting it in
* the shared cache, and then cloning the original.
*/
public Object cloneAttribute(Object attributeValue, Object original, CacheKey cacheKey, Object clone, Integer refreshCascade, AbstractSession cloningSession, boolean buildDirectlyFromRow) {
// Since valueFromRow was called with the UnitOfWork, attributeValue
// is already a registered result.
if (buildDirectlyFromRow) {
return attributeValue;
}
if (!cloningSession.isUnitOfWork()){
return mapping.buildContainerClone(attributeValue, cloningSession);
}
boolean isExisting = !cloningSession.isUnitOfWork() || (((UnitOfWorkImpl) cloningSession).isObjectRegistered(clone) && (!(((UnitOfWorkImpl)cloningSession).isOriginalNewObject(original))));
return this.getMapping().buildCloneForPartObject(attributeValue, original, cacheKey, clone, cloningSession, refreshCascade, isExisting, isExisting);// only assume from shared cache if it is existing
}
/**
* INTERNAL:
* Return whether the collection type is appropriate for the indirection policy.
* In this case, the type MUST be a Vector (or, in the case of jdk1.2,
* Collection or Map).
*/
protected boolean collectionTypeIsValid(Class collectionType) {
return getCollectionMapping().getContainerPolicy().isValidContainerType(collectionType);
}
/**
* INTERNAL:
* Return the reference row for the reference object.
* This allows the new row to be built without instantiating
* the reference object.
* Return null if the object has already been instantiated.
*/
public AbstractRecord extractReferenceRow(Object referenceObject) {
return null;
}
/**
* INTERNAL:
* An object has been serialized from the server to the client.
* Replace the transient attributes of the remote value holders
* with client-side objects.
*/
public void fixObjectReferences(Object object, Map objectDescriptors, Map processedObjects, ObjectLevelReadQuery query, RemoteSession session) {
this.mapping.fixRealObjectReferences(object, objectDescriptors, processedObjects, query, session);
}
/**
* INTERNAL:
* Return the original indirection object for a unit of work indirection object.
*/
@Override
public Object getOriginalIndirectionObject(Object unitOfWorkIndirectionObject, AbstractSession session) {
// This code appears broken, but actually is unreachable because
// only called when indirection is true.
return unitOfWorkIndirectionObject;
}
/**
* INTERNAL: Return the original valueHolder object. Access to the
* underlying valueholder may be required when serializing the valueholder
* or converting the valueHolder to another type.
*/
@Override
public Object getOriginalValueHolder(Object unitOfWorkIndirectionObject, AbstractSession session){
return unitOfWorkIndirectionObject;
}
/**
* INTERNAL:
* Return the "real" attribute value, as opposed to any wrapper.
* This will trigger the wrapper to instantiate the value.
*/
public Object getRealAttributeValueFromObject(Object object, Object attribute) {
return attribute;
}
/**
* INTERNAL:
* Extract and return the appropriate value from the
* specified remote value holder.
*/
public Object getValueFromRemoteValueHolder(RemoteValueHolder remoteValueHolder) {
throw DescriptorException.invalidIndirectionPolicyOperation(this, "getValueFromRemoteValueHolder");
}
/**
* INTERNAL
* Replace the client value holder with the server value holder,
* after copying some of the settings from the client value holder.
*/
public void mergeRemoteValueHolder(Object clientSideDomainObject, Object serverSideDomainObject, org.eclipse.persistence.internal.sessions.MergeManager mergeManager) {
throw DescriptorException.invalidIndirectionPolicyOperation(this, "mergeRemoteValueHolder");
}
/**
* INTERNAL:
* Return the null value of the appropriate attribute. That is, the
* field from the database is NULL, return what should be
* placed in the object's attribute as a result.
*/
public Object nullValueFromRow() {
return null;
}
/**
* INTERNAL:
* Return whether the specified object is instantiated.
*/
public boolean objectIsInstantiated(Object object) {
return true;
}
/**
* INTERNAL:
* Return whether the specified object can be instantiated without database access.
*/
public boolean objectIsEasilyInstantiated(Object object) {
return true;
}
/**
* INTERNAL:
* Return whether the type is appropriate for the indirection policy.
* In this case, the attribute type CANNOT be ValueHolderInterface.
*/
protected boolean typeIsValid(Class attributeType) {
return attributeType != ClassConstants.ValueHolderInterface_Class;
}
/**
* INTERNAL:
* Return whether the indirection policy actually uses indirection.
* Here, we must reply false.
*/
public boolean usesIndirection() {
return false;
}
/**
* INTERNAL:
* Verify that attributeType is correct for the
* indirection policy. If it is incorrect, add an exception to the
* integrity checker.
* In this case, the attribute type CANNOT be ValueHolderInterface.
*/
public void validateDeclaredAttributeType(Class attributeType, IntegrityChecker checker) throws DescriptorException {
super.validateDeclaredAttributeType(attributeType, checker);
if (!this.typeIsValid(attributeType)) {
checker.handleError(DescriptorException.attributeAndMappingWithoutIndirectionMismatch(this.mapping));
}
}
/**
* INTERNAL:
* Verify that attributeType is an appropriate collection type for the
* indirection policy. If it is incorrect, add an exception to the integrity checker.
* In this case, the type MUST be a Vector (or, in the case of jdk1.2,
* Collection or Map).
*/
public void validateDeclaredAttributeTypeForCollection(Class attributeType, IntegrityChecker checker) throws DescriptorException {
super.validateDeclaredAttributeTypeForCollection(attributeType, checker);
if (!this.collectionTypeIsValid(attributeType)) {
InterfaceContainerPolicy policy = (InterfaceContainerPolicy)getCollectionMapping().getContainerPolicy();
checker.handleError(DescriptorException.attributeTypeNotValid(this.getCollectionMapping(), policy.getInterfaceType()));
}
}
/**
* INTERNAL:
* Verify that getter returnType is correct for the
* indirection policy. If it is incorrect, add an exception
* to the integrity checker.
* In this case, the return type CANNOT be ValueHolderInterface.
*/
public void validateGetMethodReturnType(Class returnType, IntegrityChecker checker) throws DescriptorException {
super.validateGetMethodReturnType(returnType, checker);
if (!this.typeIsValid(returnType)) {
checker.handleError(DescriptorException.returnAndMappingWithoutIndirectionMismatch(this.mapping));
}
}
/**
* INTERNAL:
* Verify that getter returnType is an appropriate collection type for the
* indirection policy. If it is incorrect, add an exception to the integrity checker.
* In this case, the type MUST be a Vector (or, in the case of jdk1.2,
* Collection or Map).
*/
public void validateGetMethodReturnTypeForCollection(Class returnType, IntegrityChecker checker) throws DescriptorException {
super.validateGetMethodReturnTypeForCollection(returnType, checker);
if (!this.collectionTypeIsValid(returnType)) {
checker.handleError(DescriptorException.getMethodReturnTypeNotValid(getCollectionMapping()));
}
}
/**
* INTERNAL:
* Verify that setter parameterType is correct for the
* indirection policy. If it is incorrect, add an exception
* to the integrity checker.
* In this case, the parameter type CANNOT be ValueHolderInterface.
*/
public void validateSetMethodParameterType(Class parameterType, IntegrityChecker checker) throws DescriptorException {
super.validateSetMethodParameterType(parameterType, checker);
if (!this.typeIsValid(parameterType)) {
checker.handleError(DescriptorException.parameterAndMappingWithoutIndirectionMismatch(this.mapping));
}
}
/**
* INTERNAL:
* Verify that setter parameterType is an appropriate collection type for the
* indirection policy. If it is incorrect, add an exception to the integrity checker.
* In this case, the type MUST be a Vector (or, in the case of jdk1.2,
* Collection or Map).
*/
public void validateSetMethodParameterTypeForCollection(Class parameterType, IntegrityChecker checker) throws DescriptorException {
super.validateSetMethodParameterTypeForCollection(parameterType, checker);
if (!this.collectionTypeIsValid(parameterType)) {
checker.handleError(DescriptorException.setMethodParameterTypeNotValid(getCollectionMapping()));
}
}
/**
* INTERNAL:
* Return the value to be stored in the object's attribute.
* This value is determined by the batchQuery.
* In this case, extract the result from the query.
*/
public Object valueFromBatchQuery(ReadQuery batchQuery, AbstractRecord row, ObjectLevelReadQuery originalQuery, CacheKey parentCacheKey) {
return getForeignReferenceMapping().extractResultFromBatchQuery(batchQuery, parentCacheKey, row, originalQuery.getSession(), originalQuery);
}
/**
* INTERNAL:
* Return the value to be stored in the object's attribute.
* This value is determined by invoking the mapping's AttributeTransformer
*/
public Object valueFromMethod(Object object, AbstractRecord row, AbstractSession session) {
return getTransformationMapping().invokeAttributeTransformer(row, object, session);
}
/**
* INTERNAL:
* Return the value to be stored in the object's attribute.
* This value is determined by the query.
* In this case, wrap the query in a ValueHolder for later invocation.
*/
public Object valueFromQuery(ReadQuery query, AbstractRecord row, Object sourceObject, AbstractSession session) {
return valueFromQuery(query, row, session);
}
/**
* INTERNAL:
* Return the value to be stored in the object's attribute.
* This value is determined by the query.
* In this case, simply execute the query and return its results.
*/
public Object valueFromQuery(ReadQuery query, AbstractRecord row, AbstractSession session) {
return session.executeQuery(query, row);
}
/**
* INTERNAL:
* Return the value to be stored in the object's attribute.
* This value is determined by the row.
* In this case, simply return the object.
*/
public Object valueFromRow(Object object) {
return object;
}
/**
* Set the value of the appropriate attribute of target to attributeValue.
* In this case, place the value inside the target's ValueHolder.
* if trackChanges is true, set the value in the object as if the user was setting it. Allow change tracking to pick up the change.
*/
@Override
public void setRealAttributeValueInObject(Object target, Object attributeValue, boolean trackChanges) {
Object oldValue = null;
if (trackChanges && (target instanceof ChangeTracker)) {
oldValue = getRealAttributeValueFromObject(target, mapping.getAttributeValueFromObject(target));
}
setRealAttributeValueInObject(target, attributeValue);
if (trackChanges && (target instanceof ChangeTracker)) {
PropertyChangeListener listener = ((ChangeTracker) target)._persistence_getPropertyChangeListener();
if (listener != null && attributeValue != oldValue)
{
listener.propertyChange(new PropertyChangeEvent(target, mapping.getAttributeName(), oldValue, attributeValue));
}
}
}
}