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package oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors;
import javax.persistence.OneToMany;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import oracle.toplink.essentials.internal.ejb.cmp3.metadata.MetadataConstants;
import oracle.toplink.essentials.internal.ejb.cmp3.metadata.MetadataLogger;
import oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.ClassAccessor;
import oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.objects.MetadataAccessibleObject;
import oracle.toplink.essentials.internal.helper.DatabaseField;
import oracle.toplink.essentials.mappings.ManyToManyMapping;
import oracle.toplink.essentials.mappings.OneToManyMapping;
import oracle.toplink.essentials.mappings.OneToOneMapping;
/**
* A OneToMany relationship accessor. A @OneToMany annotation currently is not
* required to be on the accessible object, that is, a 1-M can default.
*
* @author Guy Pelletier
* @since TopLink EJB 3.0 Reference Implementation
*/
public class OneToManyAccessor extends CollectionAccessor {
private OneToMany m_oneToMany;
/**
* INTERNAL:
*/
public OneToManyAccessor(MetadataAccessibleObject accessibleObject, ClassAccessor classAccessor) {
super(accessibleObject, classAccessor);
m_oneToMany = getAnnotation(OneToMany.class);
}
/**
* INTERNAL: (Overridden in XMLOneToManyAccessor)
*/
public List<String> getCascadeTypes() {
if (m_oneToMany == null) {
return new ArrayList<String>();
} else {
return getCascadeTypes(m_oneToMany.cascade());
}
}
/**
* INTERNAL: (Overridden in XMLOneToManyAccessor)
*/
public String getFetchType() {
return (m_oneToMany == null) ? MetadataConstants.LAZY : m_oneToMany.fetch().name();
}
/**
* INTERNAL:
*
* Return the logging context for this accessor.
*/
protected String getLoggingContext() {
return m_logger.ONE_TO_MANY_MAPPING_REFERENCE_CLASS;
}
/**
* INTERNAL: (Overridden in XMLOneToManyAccessor)
*/
public String getMappedBy() {
return (m_oneToMany == null) ? "" : m_oneToMany.mappedBy();
}
/**
* INTERNAL: (Overridden in XMLOneToManyAccessor)
*/
public Class getTargetEntity() {
return (m_oneToMany == null) ? void.class : m_oneToMany.targetEntity();
}
/**
* INTERNAL:
*/
public boolean isOneToMany() {
return true;
}
/**
* INTERNAL:
* Process an @OneToMany or one-to-many element into a TopLink OneToMany
* mapping. If a JoinTable is found however, we must create a ManyToMany
* mapping.
*/
public void process() {
String mappedBy = getMappedBy();
// Should be treated as a uni-directional mapping using a join table.
if (mappedBy.equals("")) {
// If we find a JoinColumn(s), then throw an exception.
if (hasJoinColumn() || hasJoinColumns()) {
getValidator().throwUniDirectionalOneToManyHasJoinColumnSpecified(getAttributeName(), getJavaClass());
}
// Create a M-M mapping and process common collection mapping
// metadata.
ManyToManyMapping mapping = new ManyToManyMapping();
process(mapping);
// Process the @JoinTable.
processJoinTable(getJoinTable(), mapping);
// Add the mapping to the descriptor.
m_descriptor.addMapping(mapping);
} else {
// Create a 1-M mapping and process common collection mapping
// metadata.
OneToManyMapping mapping = new OneToManyMapping();
process(mapping);
// 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());
}
Map<DatabaseField, DatabaseField> keys = ownerMapping.getSourceToTargetKeyFields();
for (DatabaseField fkField : keys.keySet()) {
mapping.addTargetForeignKeyField(fkField, keys.get(fkField));
}
// Add the mapping to the descriptor.
m_descriptor.addMapping(mapping);
}
}
}