//$Id: Set.java 7714 2005-08-01 16:29:33Z oneovthafew $
package org.hibernate.mapping;
import java.util.Iterator;
import org.hibernate.MappingException;
import org.hibernate.engine.Mapping;
import org.hibernate.type.CollectionType;
import org.hibernate.type.TypeFactory;
/**
* A set with no nullable element columns. It will have a primary key
* consisting of all table columns (ie. key columns + element columns).
* @author Gavin King
*/
public class Set extends Collection {
public void validate(Mapping mapping) throws MappingException {
super.validate( mapping );
//for backward compatibility, disable this:
/*Iterator iter = getElement().getColumnIterator();
while ( iter.hasNext() ) {
Column col = (Column) iter.next();
if ( !col.isNullable() ) {
return;
}
}
throw new MappingException("set element mappings must have at least one non-nullable column: " + getRole() );*/
}
/**
* Constructor for Set.
* @param owner
*/
public Set(PersistentClass owner) {
super(owner);
}
public boolean isSet() {
return true;
}
public CollectionType getDefaultCollectionType() {
if ( isSorted() ) {
return TypeFactory.sortedSet( getRole(), getReferencedPropertyName(), isEmbedded(), getComparator() );
}
else if ( hasOrder() ) {
return TypeFactory.orderedSet( getRole(), getReferencedPropertyName(), isEmbedded() );
}
else {
return TypeFactory.set( getRole(), getReferencedPropertyName(), isEmbedded() );
}
}
void createPrimaryKey() {
if ( !isOneToMany() ) {
PrimaryKey pk = new PrimaryKey();
pk.addColumns( getKey().getColumnIterator() );
Iterator iter = getElement().getColumnIterator();
while ( iter.hasNext() ) {
Object selectable = iter.next();
if ( selectable instanceof Column ) {
Column col = (Column) selectable;
if ( !col.isNullable() ) {
pk.addColumn(col);
}
}
}
if ( pk.getColumnSpan()==getKey().getColumnSpan() ) {
//for backward compatibility, allow a set with no not-null
//element columns, using all columns in the row locater SQL
//TODO: create an implicit not null constraint on all cols?
}
else {
getCollectionTable().setPrimaryKey(pk);
}
}
else {
//create an index on the key columns??
}
}
public Object accept(ValueVisitor visitor) {
return visitor.accept(this);
}
}
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