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package oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors;
import java.util.HashMap;
import javax.persistence.AssociationOverride;
import javax.persistence.AssociationOverrides;
import javax.persistence.AttributeOverride;
import javax.persistence.AttributeOverrides;
import javax.persistence.Embeddable;
import javax.persistence.JoinColumn;
import static oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.EmbeddedAccessor.AccessType.MIXED;
import static oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.EmbeddedAccessor.AccessType.PROPERTY;
import static oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.EmbeddedAccessor.AccessType.FIELD;
import static oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.EmbeddedAccessor.AccessType.UNDEFINED;
import oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.objects.MetadataAccessibleObject;
import oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.objects.MetadataClass;
import oracle.toplink.essentials.internal.ejb.cmp3.metadata.columns.MetadataColumn;
import oracle.toplink.essentials.internal.ejb.cmp3.metadata.MetadataDescriptor;
import oracle.toplink.essentials.internal.ejb.cmp3.metadata.MetadataHelper;
import oracle.toplink.essentials.internal.ejb.cmp3.xml.XMLHelper;
import oracle.toplink.essentials.internal.ejb.cmp3.xml.XMLConstants;
import oracle.toplink.essentials.internal.ejb.cmp3.xml.accessors.XMLClassAccessor;
import oracle.toplink.essentials.internal.helper.DatabaseField;
import oracle.toplink.essentials.mappings.AggregateObjectMapping;
import oracle.toplink.essentials.mappings.DatabaseMapping;
import oracle.toplink.essentials.mappings.OneToOneMapping;
import org.w3c.dom.Node;
/**
* An embedded relationship accessor.
*
* @author Guy Pelletier
* @since TopLink EJB 3.0 Reference Implementation
*/
public class EmbeddedAccessor extends MetadataAccessor {
enum AccessType {FIELD, PROPERTY, UNDEFINED, MIXED};
/**
* INTERNAL:
*/
public EmbeddedAccessor(MetadataAccessibleObject accessibleObject, ClassAccessor classAccessor) {
super(accessibleObject, classAccessor);
}
/**
* INTERNAL:
*
* This method is responsible for configuring the right MetadataAccessor
* object for processing of the Embeddable class represented by the
* embeddableDescriptor that is passed in. This methood associates the
* accessor with the descriptor as well.
*
* @param embeddableDescriptor descriptor for the Embeddable
* @return a MetadataAccessor that will be used to read metadata for this class
* @throws ValidationException if the embeddable class is neither
* annotated as Embeddable nor specified as embeddable in XML.
*/
protected ClassAccessor buildAccessor(MetadataDescriptor embeddableDescriptor) {
ClassAccessor embeddableAccessor = null;
Class embeddableClass = embeddableDescriptor.getJavaClass();
if (m_project.hasEmbeddable(embeddableClass)) {
Node node = m_project.getEmbeddableNode(embeddableClass);
XMLHelper helper = m_project.getEmbeddableHelper(embeddableClass);
embeddableAccessor = new XMLClassAccessor(new MetadataClass(embeddableClass), node, helper, m_processor, embeddableDescriptor);
} else if (MetadataHelper.isAnnotationPresent(Embeddable.class, embeddableClass, embeddableDescriptor)) {
embeddableAccessor = new ClassAccessor(new MetadataClass(embeddableClass), m_processor, embeddableDescriptor);
} else {
m_validator.throwInvalidEmbeddedAttribute(getJavaClass(), m_accessibleObject.getName(), embeddableClass);
}
// associate the accessor to the descriptor (as per Javadoc)
embeddableDescriptor.setClassAccessor(embeddableAccessor);
return embeddableAccessor;
}
/**
* INTERNAL:
*
* This method computes access-type based on placement of annotations.
*/
protected AccessType computeAccessTypeFromAnnotation(MetadataDescriptor descriptor) {
Class javaClass = descriptor.getJavaClass();
boolean fieldAccess = MetadataHelper.havePersistenceAnnotationsDefined(MetadataHelper.getFields(javaClass));
boolean propertyAccess = MetadataHelper.havePersistenceAnnotationsDefined(MetadataHelper.getMethods(javaClass));
AccessType accessType = UNDEFINED;
if (fieldAccess && propertyAccess) {
accessType = MIXED;
} else if (fieldAccess) {
accessType = FIELD;
} else if (propertyAccess) {
accessType = PROPERTY;
}
return accessType;
}
/**
* INTERNAL:
*
* This method computes access-type based on metadata specified in mapping
* XML file. If there is a default value for access is specified in
* <persistence-unit-defaults> or <entity-mappings> and either there is
* no <embeddable> for the given class or there is <access> specified
* in the <embeddable>, the default value is used.
*/
protected AccessType computeAccessTypeFromXML(MetadataDescriptor descriptor) {
// step #1: what's PU level default
String access = m_project.getPersistenceUnit() != null ? m_project.getPersistenceUnit().getAccess() : null;
// step #2: what's specified in <embeddable> element
Class javaClass = descriptor.getJavaClass();
if (m_project.hasEmbeddable(javaClass)) {
XMLHelper helper = m_project.getEmbeddableHelper(javaClass);
Node node = m_project.getEmbeddableNode(javaClass);
// override pu-level value by <embeddable> level if any
// Note, we pass the puLevel value as the default value
access = helper.getNodeValue(node, XMLConstants.ATT_ACCESS, access);
}
AccessType accessType = UNDEFINED;
if (access != null && access.length() != 0) {
accessType = AccessType.valueOf(access);
}
return accessType;
}
/**
* INTERNAL:
*
* This method is responsible for determining the access-type for an
* Embeddable class represented by emDescr that is passed to
* this method. This method should *not* be called more than once as this is
* quite expensive. Now the rules:
*
* Rule 1: In the *absence* of metadata in embeddable class, access-type of
* an embeddable is determined by the access-type of the enclosing entity.
*
* Rule 2: In the presence of metadata in embeddable class, access-type of
* an embeddable is determined using that metadata. This allows sharing
* of the embeddable in entities with conflicting access-types.
*
* Rule 3: It is an error to use a *metadata-less* embeddable class in
* entities with conflicting access-types as that might result in
* different database mapping for the same embeddable class.
*
* Rule 4: It is an error if metadata-complete == false, and
* metadata is present *both* in annotations and XML, and
* access-type as determined by each of them is *not* same.
*
* Rule 5: It is an error if *both* fields and properties of an embeddable
* class are annotated and metadata-complete == false.
*
* @param emDesc descriptor for the Embeddable class
*/
protected AccessType determineAccessTypeOfEmbedded(MetadataDescriptor emDesc) {
final AccessType entityAccessType = m_descriptor.usesPropertyAccess() ? PROPERTY : FIELD;
AccessType accessType = UNDEFINED;
final boolean metadataComplete =emDesc.ignoreAnnotations();
final AccessType accessTypeUsingAnnotation = computeAccessTypeFromAnnotation(emDesc);
final AccessType accessTypeUsingXML = computeAccessTypeFromXML(emDesc);
if (metadataComplete) {
// metadata-complete is true, then use XML access-type if defined,
// else use enclosing entity's access-type.
accessType = accessTypeUsingXML != UNDEFINED ? accessTypeUsingXML : entityAccessType;
} else {// metadata-complete is false
if (accessTypeUsingAnnotation == UNDEFINED && accessTypeUsingAnnotation == UNDEFINED) {
// metadata is absent, so we use enclosing entity's access-type
accessType = entityAccessType;
} else if (accessTypeUsingXML == UNDEFINED && accessTypeUsingAnnotation != UNDEFINED) {
// annotation is present in embeddable class
accessType = accessTypeUsingAnnotation;
if (accessType == MIXED) {
m_validator.throwBothFieldsAndPropertiesAnnotatedException(emDesc.getJavaClass());
}
} else if (accessTypeUsingAnnotation == UNDEFINED && accessTypeUsingXML != UNDEFINED) {
// access is defined using XML for embeddable class
accessType = accessTypeUsingXML;
} else if (accessTypeUsingAnnotation == accessTypeUsingXML) {
// annotation is present as well as access is defined using XML
// and they are same. So use it.
accessType = accessTypeUsingAnnotation;
} else {
// annotation is present as well as access is defined using XML
// and they are different. So report an exception.
m_validator.throwIncorrectOverridingOfAccessType(emDesc.getJavaClass(), accessTypeUsingXML.toString(), accessTypeUsingAnnotation.toString());
}
}
// we have taken every precaution to make sure that either an embeddable
// has a well defined access-type or a suitable ValidationException
// is thrown.
assert(accessType != UNDEFINED && accessType != MIXED);
return accessType;
}
/**
* INTERNAL:
*/
public boolean isEmbedded() {
return true;
}
/**
* INTERNAL:
*
* This method is used to decide if annotations should be ignored or not for
* the given embeddable class.
*/
protected boolean isMetadataComplete(MetadataDescriptor emDesc) {
final Class emClass = emDesc.getJavaClass();
boolean metadataComplete = m_project.getPersistenceUnit() != null ? m_project.getPersistenceUnit().isMetadataComplete() : false;
if (!metadataComplete) {
// check <embeddable>
if (m_project.hasEmbeddable(emClass)) {
XMLHelper helper = m_project.getEmbeddableHelper(emClass);
Node node = m_project.getEmbeddableNode(emClass);
// check if metadata-complete at <embeddable> level
metadataComplete = helper.getNodeValue(node, XMLConstants.ATT_METADATA_COMPLETE, false);
}
}
return metadataComplete;
}
/**
* INTERNAL:
*
* This method is used to decide if a class metadata or not.
*/
protected boolean isMetadataPresent(MetadataDescriptor descriptor) {
AccessType annotAccessType = computeAccessTypeFromAnnotation(descriptor);
AccessType xmlAccessType = computeAccessTypeFromXML(descriptor);
return annotAccessType != UNDEFINED || xmlAccessType != UNDEFINED;
}
/**
* INTERNAL: (Overridden in EmbeddedIdAccessor)
*
* Process an @Embedded or embedded element.
*/
public void process() {
// Tell the Embeddable class to process itself
MetadataDescriptor referenceDescriptor = processEmbeddableClass();
// Store this descriptor metadata. It may be needed again later on to
// look up a mappedBy attribute.
m_descriptor.addAggregateDescriptor(referenceDescriptor);
if (m_descriptor.hasMappingForAttributeName(getAttributeName())) {
// XML/Annotation merging. XML wins, ignore annotations.
m_logger.logWarningMessage(m_logger.IGNORE_MAPPING, m_descriptor, this);
} else {
// Create an aggregate mapping and do the rest of the work.
AggregateObjectMapping mapping = new AggregateObjectMapping();
mapping.setIsReadOnly(false);
mapping.setIsNullAllowed(true);
mapping.setReferenceClassName(getReferenceClassName());
mapping.setAttributeName(getAttributeName());
// Will check for PROPERTY access
setAccessorMethods(mapping);
// Process attribute overrides.
processAttributeOverrides(mapping);
// Process association overrides.
processAssociationOverrides(mapping);
// Add the mapping to the descriptor and we are done.
m_descriptor.addMapping(mapping);
}
}
/**
* INTERNAL:
*
* Process an @AssociationOverride for an embedded object, that is, an
* aggregate object mapping in TopLink.
*
* This functionality is not supported in XML, hence why this method is
* defined here instead of on MetadataProcessor.
*
* Also this functionality is currently optional in the EJB 3.0 spec, but
* since TopLink can handle it, it is implemented and assumes the user has
* properly configured its use since it will fail silently.
*/
protected void processAssociationOverride(AssociationOverride associationOverride, AggregateObjectMapping aggregateMapping) {
MetadataDescriptor aggregateDescriptor = getReferenceDescriptor();
// AssociationOverride.name(), the name of the attribute we want to
// override.
String name = associationOverride.name();
DatabaseMapping mapping = aggregateDescriptor.getMappingForAttributeName(name);
if (mapping != null && mapping.isOneToOneMapping()) {
int index = 0;
for (JoinColumn joinColumn : associationOverride.joinColumns()) {
// We can't change the mapping from the aggregate descriptor
// so we have to add field name translations. This needs to be
// tested since I am not entirely sure if this will acutally
// work.
// In composite primary key case, how do we association the
// foreign keys? Right now we assume the association overrides
// are specified in the same order as the original joinColumns,
// therefore in the same order the foreign keys were added to
// the mapping.
DatabaseField fkField = (DatabaseField) ((OneToOneMapping) mapping).getForeignKeyFields().elementAt(index++);
aggregateMapping.addFieldNameTranslation(joinColumn.name(), fkField.getName());
}
} else {
// For now fail silently.
}
}
/**
* INTERNAL:
*
* Process an @AssociationOverrides for an embedded object, that is, an
* aggregate object mapping in TopLink.
*
* It will also look for an @AssociationOverride.
*/
protected void processAssociationOverrides(AggregateObjectMapping mapping) {
// Look for an @AssociationOverrides.
AssociationOverrides associationOverrides = getAnnotation(AssociationOverrides.class);
if (associationOverrides != null) {
for (AssociationOverride associationOverride : associationOverrides.value()) {
processAssociationOverride(associationOverride, mapping);
}
}
// Look for an @AssociationOverride.
AssociationOverride associationOverride = getAnnotation(AssociationOverride.class);
if (associationOverride != null) {
processAssociationOverride(associationOverride, mapping);
}
}
/**
* INTERNAL: (Overridden in EmbeddedIdAccessor)
*
* Process an @AttributeOverride or attribute-override element for an
* embedded object, that is, an aggregate object mapping in TopLink.
*/
protected void processAttributeOverride(AggregateObjectMapping mapping, MetadataColumn column) {
String attributeName = column.getAttributeName();
// Set the attribute name on the aggregate.
DatabaseMapping aggregateMapping = getReferenceDescriptor().getMappingForAttributeName(attributeName);
if (aggregateMapping == null) {
m_validator.throwInvalidEmbeddableAttribute(getJavaClass(), mapping.getAttributeName(), getReferenceDescriptor().getJavaClass(), attributeName);
}
// A sub-class to a mapped superclass may override an embedded attribute
// override.
if (m_descriptor.hasAttributeOverrideFor(attributeName)) {
// Update the field on this metadata column. We do that so that
// an embedded id can associate the correct id fields.
column.setDatabaseField(m_descriptor.getAttributeOverrideFor(attributeName).getDatabaseField());
}
mapping.addFieldNameTranslation(column.getDatabaseField().getQualifiedName(), aggregateMapping.getField().getName());
}
/**
* INTERNAL: (Overridden in XMLEmbeddedAccessor and XMLEmbeddedIdAccessor)
*
* Process an @AttributeOverrides for an embedded object, that is, an
* aggregate object mapping in TopLink.
*
* It will also look for an @AttributeOverride.
*/
protected void processAttributeOverrides(AggregateObjectMapping mapping) {
// Look for an @AttributeOverrides.
AttributeOverrides attributeOverrides = getAnnotation(AttributeOverrides.class);
if (attributeOverrides != null) {
for (AttributeOverride attributeOverride : attributeOverrides.value()) {
processAttributeOverride(mapping, new MetadataColumn(attributeOverride.column(), attributeOverride.name(), getAnnotatedElement()));
}
}
// Look for an @AttributeOverride.
AttributeOverride attributeOverride = getAnnotation(AttributeOverride.class);
if (attributeOverride != null) {
processAttributeOverride(mapping, new MetadataColumn(attributeOverride.column(), attributeOverride.name(), getAnnotatedElement()));
}
}
/**
* INTERNAL: (Overridden in EmbeddedIdAccessor)
*
* This method processes an embeddable class, if we have not processed it
* yet. The reason for lazy processing of embeddable class is because of
* rules governing access-type of embeddable. See GlassFish issue #831 for
* more details.
*
* Be careful while changing order of processing.
*/
protected MetadataDescriptor processEmbeddableClass() {
final Class embeddableClass = getReferenceClass();
MetadataDescriptor embeddableDescriptor = null;
try {
embeddableDescriptor = m_project.getDescriptor(embeddableClass);
} catch (Exception exception) {
// expected as we do lazy processing of embeddables.
}
if (embeddableDescriptor == null) {
// The embeddable class is not yet processed, so process it now.
embeddableDescriptor = new MetadataDescriptor(embeddableClass);
// adding to projects sets up appropriate persistence-unit-defaults
m_project.addDescriptor(embeddableDescriptor);
embeddableDescriptor.setIgnoreAnnotations(isMetadataComplete(embeddableDescriptor));
AccessType accessType = determineAccessTypeOfEmbedded(embeddableDescriptor);
embeddableDescriptor.setUsesPropertyAccess(accessType == PROPERTY ? true : false);
ClassAccessor embeddableAccessor = buildAccessor(embeddableDescriptor);
embeddableAccessor.process();
embeddableAccessor.setIsProcessed();
} else {
// We have already processed this embeddable class. let's validate
// that it is not used in entities with conflicting access type.
// Conflicting access-type is not allowed when there is no metadata
// in the embeddable class.
if (!isMetadataPresent(embeddableDescriptor)) {
boolean embeddableUsesPropertyAccess = embeddableDescriptor.usesPropertyAccess();
boolean entityUsesPropertyAccess = m_descriptor.usesPropertyAccess();
if (embeddableUsesPropertyAccess != entityUsesPropertyAccess) {
m_validator.throwConflictingAccessTypeInEmbeddable(embeddableClass);
}
}
}
return embeddableDescriptor;
}
}
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