/*
* $Id$
*
* Copyright (c) 2004 by Rodney Kinney
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License (LGPL) as published by the Free Software Foundation.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, copies are available
* at http://www.opensource.org.
*/
package VASSAL.configure;
import VASSAL.build.AbstractConfigurable;
import VASSAL.build.Buildable;
/**
* Ensures that at most a single instance of a given type
* belongs to a given parent
*/
public class SingleChildInstance implements ValidityChecker {
private AbstractConfigurable target;
private Class<?> childClass;
public SingleChildInstance(AbstractConfigurable target,
Class<?> childClass) {
this.childClass = childClass;
this.target = target;
}
public void validate(Buildable b, ValidationReport report) {
if (b == target && target.getComponentsOf(childClass).size() > 1) {
report.addWarning(
"No more than one " +
ConfigureTree.getConfigureName(childClass) +
" allowed in " +
ConfigureTree.getConfigureName(target));
}
}
}