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package oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors;
import java.util.ArrayList;
import java.util.List;
import javax.persistence.OneToOne;
import oracle.toplink.essentials.internal.ejb.cmp3.metadata.MetadataConstants;
import oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.objects.MetadataAccessibleObject;
import oracle.toplink.essentials.mappings.OneToOneMapping;
/**
* A one to one relationship accessor. A @OneToOne annotation currently is not
* required to be on the accessible object, that is, a 1-1 can default.
*
* @author Guy Pelletier
* @since TopLink EJB 3.0 Reference Implementation
*/
public class OneToOneAccessor extends ObjectAccessor {
private OneToOne m_oneToOne;
/**
* INTERNAL:
*/
public OneToOneAccessor(MetadataAccessibleObject accessibleObject, ClassAccessor classAccessor) {
super(accessibleObject, classAccessor);
m_oneToOne = getAnnotation(OneToOne.class);
}
/**
* INTERNAL: (Overridden in XMLOneToOneAccessor)
*/
public List<String> getCascadeTypes() {
if (m_oneToOne == null) {
return new ArrayList<String>();
} else {
return getCascadeTypes(m_oneToOne.cascade());
}
}
/**
* INTERNAL: (Overridden in XMLOneToOneAccessor)
*/
public String getFetchType() {
return (m_oneToOne == null) ? MetadataConstants.EAGER : m_oneToOne.fetch().name();
}
/**
* INTERNAL:
*
* Return the logging context for this accessor.
*/
protected String getLoggingContext() {
return m_logger.ONE_TO_ONE_MAPPING_REFERENCE_CLASS;
}
/**
* INTERNAL: (Overridden in XMLOneToOneAccessor)
*/
public String getMappedBy() {
return (m_oneToOne == null) ? "" : m_oneToOne.mappedBy();
}
/**
* INTERNAL: (Overridden in XMLOneToOneAccessor)
*/
public Class getTargetEntity() {
return (m_oneToOne == null) ? void.class : m_oneToOne.targetEntity();
}
/**
* INTERNAL:
*/
public boolean isOneToOne() {
return true;
}
/**
* INTERNAL:
*/
public boolean isOptional() {
return (m_oneToOne == null) ? true : m_oneToOne.optional();
}
/**
* INTERNAL:
* Process a @OneToOne or one-to-one element into a TopLink OneToOne
* mapping.
*/
public void process() {
// Initialize our mapping now with what we found.
OneToOneMapping mapping = initOneToOneMapping();
if (getMappedBy().equals("")) {
// Owning side, look for JoinColumns or PrimaryKeyJoinColumns.
processOwningMappingKeys(mapping);
} else {
// Non-owning side, process the foreign keys from the owner.
OneToOneMapping ownerMapping = null;
if (getOwningMapping().isOneToOneMapping()){
ownerMapping = (OneToOneMapping)getOwningMapping();
} else {
// If improper mapping encountered, throw an exception.
getValidator().throwInvalidMappingEncountered(getJavaClass(), getReferenceClass());
}
mapping.setSourceToTargetKeyFields(ownerMapping.getTargetToSourceKeyFields());
mapping.setTargetToSourceKeyFields(ownerMapping.getSourceToTargetKeyFields());
}
// Add the mapping to the descriptor.
m_descriptor.addMapping(mapping);
}
}