org.hibernate.mapping.Set.java Source code

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Here is the source code for org.hibernate.mapping.Set.java

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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
 */
package org.hibernate.mapping;

import java.util.Iterator;

import org.hibernate.MappingException;
import org.hibernate.boot.spi.MetadataBuildingContext;
import org.hibernate.boot.spi.MetadataImplementor;
import org.hibernate.engine.spi.Mapping;
import org.hibernate.type.CollectionType;

/**
 * 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 {
    /**
     * @deprecated Use {@link Set#Set(MetadataBuildingContext, PersistentClass)} instead.
     */
    @Deprecated
    public Set(MetadataImplementor metadata, PersistentClass owner) {
        super(metadata, owner);
    }

    public Set(MetadataBuildingContext buildingContext, PersistentClass owner) {
        super(buildingContext, owner);
    }

    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() );*/
    }

    public boolean isSet() {
        return true;
    }

    public CollectionType getDefaultCollectionType() {
        if (isSorted()) {
            return getMetadata().getTypeResolver().getTypeFactory().sortedSet(getRole(),
                    getReferencedPropertyName(), getComparator());
        } else if (hasOrder()) {
            return getMetadata().getTypeResolver().getTypeFactory().orderedSet(getRole(),
                    getReferencedPropertyName());
        } else {
            return getMetadata().getTypeResolver().getTypeFactory().set(getRole(), getReferencedPropertyName());
        }
    }

    void createPrimaryKey() {
        if (!isOneToMany()) {
            PrimaryKey pk = new PrimaryKey(getCollectionTable());
            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);
                    } else {
                        return;
                    }
                }
            }
            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);
    }
}