Ptidej-v5.2-master/POM Tests/data/ArgoUML_0.28/src/org/argouml/ui/TransferableModelElements.java
// $Id: TransferableModelElements.java 11510 2006-11-24 07:37:59Z tfmorris $
// Copyright (c) 2005-2006 The Regents of the University of California. All
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// software and its documentation without fee, and without a written
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package org.argouml.ui;

import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.IOException;
import java.util.Collection;

/**
 * A transferable wraps the data that is transferred
 * (in casu a collection of UML modelelements)
 * from a drag source to a drop target.
 * The initiator of a drag wraps data in a transferable,
 * and drops are handled by accessing a transferable's data.
 */
public class TransferableModelElements implements Transferable {

    /**
     * The data flavor we use for collections of UML elements.
     */
    public static final DataFlavor UML_COLLECTION_FLAVOR =
        new DataFlavor(Collection.class, "UML ModelElements Collection");

    private static DataFlavor[] flavors = {UML_COLLECTION_FLAVOR };

    private Collection theModelElements;

    /**
     * The constructor.
     *
     * @param data the collection of UML elements
     */
    public TransferableModelElements(Collection data) {

        theModelElements = data;
    }

    /*
     * @see java.awt.datatransfer.Transferable#getTransferData(java.awt.datatransfer.DataFlavor)
     */
    public Object getTransferData(DataFlavor dataFlavor)
        throws UnsupportedFlavorException,
               IOException {

        if (dataFlavor.match(UML_COLLECTION_FLAVOR)) {
            return theModelElements;
        }
        /*
         * TODO: We could also support other flavors here,
         * e.g. image (then you can drag modelelements directly into
         * your wordprocessor, to be inserted as an image).
         */
        throw new UnsupportedFlavorException(dataFlavor);
    }

    /*
     * @see java.awt.datatransfer.Transferable#getTransferDataFlavors()
     */
    public DataFlavor[] getTransferDataFlavors() {
        return flavors;
    }

    /*
     * @see java.awt.datatransfer.Transferable#isDataFlavorSupported(java.awt.datatransfer.DataFlavor)
     */
    public boolean isDataFlavorSupported(DataFlavor dataFlavor) {

        return dataFlavor.match(UML_COLLECTION_FLAVOR);
    }

}
