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package oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors;
import java.util.List;
import java.util.ArrayList;
import javax.persistence.CascadeType;
import javax.persistence.JoinColumn;
import javax.persistence.JoinColumns;
import javax.persistence.PrimaryKeyJoinColumn;
import javax.persistence.PrimaryKeyJoinColumns;
import oracle.toplink.essentials.mappings.DatabaseMapping;
import oracle.toplink.essentials.mappings.ForeignReferenceMapping;
import oracle.toplink.essentials.indirection.ValueHolderInterface;
import oracle.toplink.essentials.internal.ejb.cmp3.metadata.MetadataConstants;
import oracle.toplink.essentials.internal.ejb.cmp3.metadata.MetadataDescriptor;
import oracle.toplink.essentials.internal.ejb.cmp3.metadata.columns.MetadataJoinColumn;
import oracle.toplink.essentials.internal.ejb.cmp3.metadata.columns.MetadataJoinColumns;
import oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.ClassAccessor;
import oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.objects.MetadataAccessibleObject;
/**
* An relational accessor.
*
* @author Guy Pelletier
* @since TopLink EJB 3.0 Reference Implementation
*/
public abstract class RelationshipAccessor extends MetadataAccessor {
protected Class m_referenceClass;
/**
* INTERNAL:
*/
protected RelationshipAccessor(MetadataAccessibleObject accessibleObject, ClassAccessor classAccessor) {
super(accessibleObject, classAccessor);
}
/**
* INTERNAL:
*
* Return the cascade types for this accessor. This method is supported by
* all relational accessors.
*/
public abstract List getCascadeTypes();
/**
* INTERNAL:
* WIP: Probably should make cascade types into its own object eventually.
*/
public ArrayList getCascadeTypes(CascadeType[] cascadeTypes) {
ArrayList cTypes = new ArrayList();
for (CascadeType cascadeType : cascadeTypes) {
cTypes.add(cascadeType.name());
}
return cTypes;
}
/**
* INTERNAL: (Overridden in XMLOneToOneAccessor, XMLManyToManyAccessor and XMLOneToManyAccessor)
* Process the @JoinColumns and @JoinColumn.
*/
protected MetadataJoinColumns getJoinColumns() {
JoinColumn joinColumn = getAnnotation(JoinColumn.class);
JoinColumns joinColumns = getAnnotation(JoinColumns.class);
return new MetadataJoinColumns(joinColumns, joinColumn);
}
/**
* INTERNAL:
*
* Return the logging context for this accessor.
*/
protected abstract String getLoggingContext();
/**
* INTERNAL:
*
* Subclasses that support processing a mapped by should override this
* method, otherwise a runtime development exception is thrown for those
* accessors who call this method and don't implement it themselves.
*/
public String getMappedBy() {
throw new RuntimeException("Development exception. The accessor: [" + this + "] should not call the getMappedBy method unless it overrides it.");
}
/**
* INTERNAL:
* Method to return an owner mapping. It will tell the owner class to
* process itself if it hasn't already done so.
*/
protected DatabaseMapping getOwningMapping() {
String ownerAttributeName = getMappedBy();
MetadataDescriptor ownerDescriptor = getReferenceDescriptor();
DatabaseMapping mapping = ownerDescriptor.getMappingForAttributeName(ownerAttributeName, this);
// If no mapping was found, there is an error in the mappedBy field,
// therefore, throw an exception.
if (mapping == null) {
m_validator.throwNoMappedByAttributeFound(ownerDescriptor.getJavaClass(), ownerAttributeName, getJavaClass(), getAttributeName());
}
return mapping;
}
/**
* INTERNAL:
* Return the reference metadata descriptor for this accessor.
* This method does additional checks to make sure that the target
* entity is indeed an entity class.
*/
public MetadataDescriptor getReferenceDescriptor() {
MetadataDescriptor descriptor;
try {
descriptor = super.getReferenceDescriptor();
} catch (Exception exception) {
descriptor = null;
}
if (descriptor == null || descriptor.isEmbeddable() || descriptor.isEmbeddableCollection()) {
m_validator.throwNonEntityTargetInRelationship(getJavaClass(), getReferenceClass(), getAnnotatedElement());
}
return descriptor;
}
/**
* INTERNAL:
* Return the target entity for this accessor. This method is supported by
* all relational accessors.
*/
public abstract Class getTargetEntity();
/**
* INTERNAL:
* Method to check if an annotated element has a @JoinColumn.
*/
public boolean hasJoinColumn() {
return isAnnotationPresent(JoinColumn.class);
}
/**
* INTERNAL:
* Method to check if an annotated element has a @JoinColumns.
*/
public boolean hasJoinColumns() {
return isAnnotationPresent(JoinColumns.class);
}
/**
* INTERNAL: (Overridden in XMLOneToOneAccessor)
* Method to check if an annotated element has a @PrimaryKeyJoinColumns or
* at the very least a @PrimaryKeyJoinColumn.
*/
public boolean hasPrimaryKeyJoinColumns() {
return isAnnotationPresent(PrimaryKeyJoinColumns.class) || isAnnotationPresent(PrimaryKeyJoinColumn.class);
}
/**
* INTERNAL:
* Return true if this accessor represents a 1-1 primary key relationship.
*/
public boolean isOneToOnePrimaryKeyRelationship() {
return isOneToOne() && hasPrimaryKeyJoinColumns();
}
/**
* INTERNAL:
*/
protected void processCascadeTypes(ForeignReferenceMapping mapping) {
for (String cascadeType : getCascadeTypes()) {
setCascadeType(cascadeType, mapping);
}
// Apply the persistence unit default cascade-persist if necessary.
if (m_descriptor.isCascadePersist() && ! mapping.isCascadePersist()) {
setCascadeType(CascadeType.PERSIST.name(), mapping);
}
}
/**
* INTERNAL:
* Process a @JoinColumns or @JoinColumn. Will look for association
* overrides.
*/
protected List processJoinColumns() {
if (m_descriptor.hasAssociationOverrideFor(getAttributeName())) {
return processJoinColumns(m_descriptor.getAssociationOverrideFor(getAttributeName()), getReferenceDescriptor());
} else {
return processJoinColumns(getJoinColumns(), getReferenceDescriptor());
}
}
/**
* INTERNAL:
*
* Process MetadataJoinColumns.
*/
protected List processJoinColumns(MetadataJoinColumns joinColumns, MetadataDescriptor descriptor) {
// This call will add any defaulted columns as necessary.
List jColumns = joinColumns.values(descriptor);
if (descriptor.hasCompositePrimaryKey()) {
// The number of join columns should equal the number of primary key fields.
if (jColumns.size() != descriptor.getPrimaryKeyFields().size()) {
m_validator.throwIncompleteJoinColumnsSpecified(getJavaClass(), getAnnotatedElement());
}
// All the primary and foreign key field names should be specified.
for (MetadataJoinColumn jColumn : jColumns) {
if (jColumn.isPrimaryKeyFieldNotSpecified() || jColumn.isForeignKeyFieldNotSpecified()) {
m_validator.throwIncompleteJoinColumnsSpecified(getJavaClass(), getAnnotatedElement());
}
}
} else {
if (jColumns.size() > 1) {
m_validator.throwExcessiveJoinColumnsSpecified(getJavaClass(), getAnnotatedElement());
}
}
return jColumns;
}
/**
* INTERNAL:
* Front end validation before actually processing the relationship
* accessor. The process() method should not be called directly.
*/
public void processRelationship() {
// The processing of this accessor may have been fast tracked through a
// non-owning relationship. If so, no processing is required.
if (! isProcessed()) {
if (m_descriptor.hasMappingForAttributeName(getAttributeName())) {
// Only true if there is one that came from Project.xml
m_logger.logWarningMessage(m_logger.IGNORE_MAPPING, this);
} else {
// If a @Column is specified then throw an exception.
if (hasColumn()) {
m_validator.throwRelationshipHasColumnSpecified(getJavaClass(), getAttributeName());
}
// Process the relationship accessor only if the target entity
// is not a ValueHolderInterface.
if (getTargetEntity() == ValueHolderInterface.class || (getTargetEntity() == void.class && getReferenceClass() == ValueHolderInterface.class)) {
// do nothing ... I'm too lazy (or too stupid) to do the negation of this expression :-)
} else {
process();
}
}
// Set its processing completed flag to avoid double processing.
setIsProcessed();
}
}
/**
* INTERNAL:
* Set the cascade type on a mapping.
*/
protected void setCascadeType(String type, ForeignReferenceMapping mapping) {
if (type.equals(MetadataConstants.CASCADE_ALL) || type.equals(CascadeType.ALL.name())) {
mapping.setCascadeAll(true);
} else if (type.equals(MetadataConstants.CASCADE_MERGE) || type.equals(CascadeType.MERGE.name())) {
mapping.setCascadeMerge(true);
} else if (type.equals(MetadataConstants.CASCADE_PERSIST) || type.equals(CascadeType.PERSIST.name())) {
mapping.setCascadePersist(true);
} else if (type.equals(MetadataConstants.CASCADE_REFRESH) || type.equals(CascadeType.REFRESH.name())) {
mapping.setCascadeRefresh(true);
} else if (type.equals(MetadataConstants.CASCADE_REMOVE) || type.equals(CascadeType.REMOVE.name())) {
mapping.setCascadeRemove(true);
}
}
}
