// $Id: Relocatable.java 41 2010-04-03 20:04:12Z marcusvnac $
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package org.argouml.uml.diagram;
import java.util.Collection;
/**
* Interface which is used by the Explorer to determine if a diagram can
* change its location to a new model element.
*
* @author MarkusK
*
*/
public interface Relocatable {
/**
* This function should return true if it is allowed to relocate
* this type of diagram to the given modelelement.
*
* @param base the given modelelement
* @return true if adding a diagram here is allowed
*/
boolean isRelocationAllowed(Object base);
/**
* Relocate this diagram,
* e.g. for a class diagram assign it a new namespace,
* e.g. for a statechart move it together with the
* statemachine to a new operation/classifier. <p>
*
* Precondition: isRelocationAllowed(base) is true.
*
* @param base the new location, i.e. base modelelement
* @return true if successful
*/
boolean relocate(Object base);
/**
* Create a collection of candidate modelelements
* to relocate this diagram to.
* All candidates belong to a given namespace - e.g. the root Model.
*
* @param root all returned candidates are contained in this namespace
* @return the collection of candidate modelelements
* to which this diagram may be relocated
*/
@SuppressWarnings("unchecked")
Collection getRelocationCandidates(Object root);
}