Ptidej-v5.2-master/POM Tests/data/ArgoUML_0.28/src/org/argouml/uml/ui/behavior/collaborations/ActionAddMessagePredecessor.java
// $Id: ActionAddMessagePredecessor.java 13828 2007-11-23 23:53:04Z tfmorris $
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// software and its documentation without fee, and without a written
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package org.argouml.uml.ui.behavior.collaborations;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

import org.argouml.i18n.Translator;
import org.argouml.model.Model;
import org.argouml.uml.ui.AbstractActionAddModelElement2;

/**
 * Action to add a predecessor to some message.
 * @since Oct 2, 2002
 * @author jaap.branderhorst@xs4all.nl
 * @stereotype singleton
 */
public class ActionAddMessagePredecessor extends AbstractActionAddModelElement2 {

    private static final ActionAddMessagePredecessor SINGLETON =
	new ActionAddMessagePredecessor();

    /**
     * Constructor for ActionAddMessagePredecessor.
     */
    protected ActionAddMessagePredecessor() {
        super();
    }


    protected List getChoices() {
        if (getTarget() == null) {
            return Collections.EMPTY_LIST;
        }
        List vec = new ArrayList();
        vec.addAll(Model.getCollaborationsHelper()
                .getAllPossiblePredecessors(getTarget()));
        return vec;
    }


    protected List getSelected() {
        if (getTarget() == null) {
	    throw new IllegalStateException(
                "getSelected may not be called with null target");
        }
        List vec = new ArrayList();
        vec.addAll(Model.getFacade().getPredecessors(getTarget()));
        return vec;
    }


    protected String getDialogTitle() {
        return Translator.localize("dialog.add-predecessors");
    }


    protected void doIt(Collection selected) {
	if (getTarget() == null)
	    throw new IllegalStateException(
                "doIt may not be called with null target");
	Object message = getTarget();
	Model.getCollaborationsHelper().setPredecessors(message, selected);
    }

    /**
     * @return Returns the SINGLETON.
     */
    public static ActionAddMessagePredecessor getInstance() {
        return SINGLETON;
    }

}
