/*
* JBoss, Home of Professional Open Source.
* Copyright 2013, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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 software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.as.controller.access.constraint;
/**
* Abstract superclass for {@link ConstraintFactory} implementations.
*
* @author Brian Stansberry (c) 2013 Red Hat Inc.
*/
abstract class AbstractConstraintFactory implements ConstraintFactory {
@Override
public int compareTo(ConstraintFactory o) {
if (o instanceof AbstractConstraintFactory) {
// We have no particular preference, so defer to other
int otherPref = ((AbstractConstraintFactory) o).internalCompare(this);
if (otherPref == 0) {
// Other also has no preference. We came first, so we stay first
return this.equals(o) ? 0 : -1;
}
// Defer to other
return otherPref * -1;
}
return -1;
}
/**
* Compare this {@link AbstractConstraintFactory} to another. Similar contract to {@link Comparable#compareTo(Object)}
* except that a return value of {@code 0} does not imply equality; rather it implies indifference with respect
* to order. The intended use for this method is in {@link Comparable#compareTo(Object)} implementations where
* the class implementing the method has no preference with respect to order and is willing to go with the
* preference of the passed in object if it has one.
*
* @param other the other constraint factory
*/
protected abstract int internalCompare(AbstractConstraintFactory other);
}