org.hibernate.type.ForeignKeyDirection Maven / Gradle / Ivy
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2010, Red Hat Inc. or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.type;
import java.io.Serializable;
import org.hibernate.engine.internal.CascadePoint;
/**
* Represents directionality of the foreign key constraint
* @author Gavin King
*/
public abstract class ForeignKeyDirection implements Serializable {
protected ForeignKeyDirection() {}
/**
* Should we cascade at this cascade point?
*
* @param cascadePoint The point at which the cascade is being initiated.
*
* @return {@code true} if cascading should be performed now.
*
* @see org.hibernate.engine.internal.Cascade
*/
public abstract boolean cascadeNow(CascadePoint cascadePoint);
/**
* A foreign key from child to parent
*/
public static final ForeignKeyDirection FOREIGN_KEY_TO_PARENT = new ForeignKeyDirection() {
@Override
public boolean cascadeNow(CascadePoint cascadePoint) {
return cascadePoint != CascadePoint.BEFORE_INSERT_AFTER_DELETE;
}
@Override
public String toString() {
return "toParent";
}
Object readResolve() {
return FOREIGN_KEY_TO_PARENT;
}
};
/**
* A foreign key from parent to child
*/
public static final ForeignKeyDirection FOREIGN_KEY_FROM_PARENT = new ForeignKeyDirection() {
@Override
public boolean cascadeNow(CascadePoint cascadePoint) {
return cascadePoint != CascadePoint.AFTER_INSERT_BEFORE_DELETE;
}
@Override
public String toString() {
return "fromParent";
}
Object readResolve() {
return FOREIGN_KEY_FROM_PARENT;
}
};
}