// $Id: GoUseCaseToExtensionPoint.java,v 1.10 2004/09/04 06:59:49 mvw Exp $
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package org.argouml.ui.explorer.rules;

import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

import org.argouml.i18n.Translator;
import org.argouml.model.ModelFacade;

/**
 * Rule for Use Case->Extension Point.
 * Provides a rule to display extension points in the navigation pane.

 *
 * @author  16 Apr 2002. Jeremy Bennett (mail@jeremybennett.com).
 */
public class GoUseCaseToExtensionPoint extends AbstractPerspectiveRule {
    /**
     * 
Give a name to this rule.
     *
     * @return  The name of the rule ("Use Case->Extension
     *          Point"). 
     */
    public String getRuleName() {
        return Translator.localize ("misc.use-case.extension-point");
    }

    /**
     * @see org.argouml.ui.explorer.rules.PerspectiveRule#getChildren(java.lang.Object)
     */
    public Collection getChildren(Object parent) { 
        if (ModelFacade.isAUseCase(parent)) {
            return ModelFacade.getExtensionPoints(parent);
        }
        return null;
    }

    /**
     * @see org.argouml.ui.explorer.rules.PerspectiveRule#getDependencies(java.lang.Object)
     */
    public Set getDependencies(Object parent) {
        if (ModelFacade.isAUseCase(parent)) {
	    Set set = new HashSet();
	    set.add(parent);
	    return set;
	}
	return null;
    }
}  /* End of class GoUseCaseToExtensionPoint */