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A modified version of some JGraph files
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/*
 * @(#)BasicGraphTransferable	1.0 03-JUL-04
 * 
 * Copyright (c) 2001-2004 Gaudenz Alder
 *  
 */
package org.jgraph.plaf.basic;

import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.io.Serializable;
import java.io.StringBufferInputStream;
import java.io.StringReader;

import javax.swing.plaf.UIResource;

public class BasicGraphTransferable
	implements Transferable, UIResource, Serializable {

	private static DataFlavor[] htmlFlavors;
	private static DataFlavor[] stringFlavors;
	private static DataFlavor[] plainFlavors;

	static {
		try {
			htmlFlavors = new DataFlavor[3];
			htmlFlavors[0] = new DataFlavor("text/html;class=java.lang.String");
			htmlFlavors[1] = new DataFlavor("text/html;class=java.io.Reader");
			htmlFlavors[2] =
				new DataFlavor("text/html;charset=unicode;class=java.io.InputStream");

			plainFlavors = new DataFlavor[3];
			plainFlavors[0] =
				new DataFlavor("text/plain;class=java.lang.String");
			plainFlavors[1] = new DataFlavor("text/plain;class=java.io.Reader");
			plainFlavors[2] =
				new DataFlavor("text/plain;charset=unicode;class=java.io.InputStream");

			stringFlavors = new DataFlavor[2];
			stringFlavors[0] =
				new DataFlavor(
					DataFlavor.javaJVMLocalObjectMimeType
						+ ";class=java.lang.String");
			stringFlavors[1] = DataFlavor.stringFlavor;

		} catch (ClassNotFoundException cle) {
			System.err.println(
				"error initializing javax.swing.plaf.basic.BasicTranserable");
		}
	}

	/**
	 * Returns an array of DataFlavor objects indicating the flavors the data
	 * can be provided in.  The array should be ordered according to preference
	 * for providing the data (from most richly descriptive to least descriptive).
	 * @return an array of data flavors in which this data can be transferred
	 */
	public DataFlavor[] getTransferDataFlavors() {
		DataFlavor[] richerFlavors = getRicherFlavors();
		int nRicher = (richerFlavors != null) ? richerFlavors.length : 0;
		int nHTML = (isHTMLSupported()) ? htmlFlavors.length : 0;
		int nPlain = (isPlainSupported()) ? plainFlavors.length : 0;
		int nString = (isPlainSupported()) ? stringFlavors.length : 0;
		int nFlavors = nRicher + nHTML + nPlain + nString;
		DataFlavor[] flavors = new DataFlavor[nFlavors];

		// fill in the array
		int nDone = 0;
		if (nRicher > 0) {
			System.arraycopy(richerFlavors, 0, flavors, nDone, nRicher);
			nDone += nRicher;
		}
		if (nHTML > 0) {
			System.arraycopy(htmlFlavors, 0, flavors, nDone, nHTML);
			nDone += nHTML;
		}
		if (nPlain > 0) {
			System.arraycopy(plainFlavors, 0, flavors, nDone, nPlain);
			nDone += nPlain;
		}
		if (nString > 0) {
			System.arraycopy(stringFlavors, 0, flavors, nDone, nString);
			nDone += nString;
		}
		return flavors;
	}

	/**
	 * Returns whether or not the specified data flavor is supported for
	 * this object.
	 * @param flavor the requested flavor for the data
	 * @return boolean indicating whether or not the data flavor is supported
	 */
	public boolean isDataFlavorSupported(DataFlavor flavor) {
		DataFlavor[] flavors = getTransferDataFlavors();
		for (int i = 0; i < flavors.length; i++) {
			if (flavors[i].equals(flavor)) {
				return true;
			}
		}
		return false;
	}

	/**
	 * Returns an object which represents the data to be transferred.  The class
	 * of the object returned is defined by the representation class of the flavor.
	 *
	 * @param flavor the requested flavor for the data
	 * @see DataFlavor#getRepresentationClass
	 * @exception IOException                if the data is no longer available
	 *              in the requested flavor.
	 * @exception UnsupportedFlavorException if the requested data flavor is
	 *              not supported.
	 */
	public Object getTransferData(DataFlavor flavor)
		throws UnsupportedFlavorException, IOException {
		if (isRicherFlavor(flavor)) {
			return getRicherData(flavor);
		} else if (isHTMLFlavor(flavor)) {
			String data = getHTMLData();
			data = (data == null) ? "" : data;
			if (String.class.equals(flavor.getRepresentationClass())) {
				return data;
			} else if (Reader.class.equals(flavor.getRepresentationClass())) {
				return new StringReader(data);
			} else if (
				InputStream.class.equals(flavor.getRepresentationClass())) {
				return new StringBufferInputStream(data);
			}
			// fall through to unsupported
		} else if (isPlainFlavor(flavor)) {
			String data = getPlainData();
			data = (data == null) ? "" : data;
			if (String.class.equals(flavor.getRepresentationClass())) {
				return data;
			} else if (Reader.class.equals(flavor.getRepresentationClass())) {
				return new StringReader(data);
			} else if (
				InputStream.class.equals(flavor.getRepresentationClass())) {
				return new StringBufferInputStream(data);
			}
			// fall through to unsupported

		} else if (isStringFlavor(flavor)) {
			String data = getPlainData();
			data = (data == null) ? "" : data;
			return data;
		}
		throw new UnsupportedFlavorException(flavor);
	}

	// --- richer subclass flavors ----------------------------------------------

	protected boolean isRicherFlavor(DataFlavor flavor) {
		DataFlavor[] richerFlavors = getRicherFlavors();
		int nFlavors = (richerFlavors != null) ? richerFlavors.length : 0;
		for (int i = 0; i < nFlavors; i++) {
			if (richerFlavors[i].equals(flavor)) {
				return true;
			}
		}
		return false;
	}

	/**
	 * Some subclasses will have flavors that are more descriptive than HTML
	 * or plain text.  If this method returns a non-null value, it will be
	 * placed at the start of the array of supported flavors.
	 */
	protected DataFlavor[] getRicherFlavors() {
		return null;
	}

	protected Object getRicherData(DataFlavor flavor)
		throws UnsupportedFlavorException {
		return null;
	}

	// --- html flavors ----------------------------------------------------------

	/**
	 * Returns whether or not the specified data flavor is an HTML flavor that
	 * is supported.
	 * @param flavor the requested flavor for the data
	 * @return boolean indicating whether or not the data flavor is supported
	 */
	protected boolean isHTMLFlavor(DataFlavor flavor) {
		DataFlavor[] flavors = htmlFlavors;
		for (int i = 0; i < flavors.length; i++) {
			if (flavors[i].equals(flavor)) {
				return true;
			}
		}
		return false;
	}

	/**
	 * Whether the HTML flavors are offered. If so, the method
	 * getHTMLData should be implemented to provide something reasonable.
	 */
	protected boolean isHTMLSupported() {
		return false;
	}

	/**
	 * Fetch the data in a text/html format
	 */
	protected String getHTMLData() {
		return null;
	}

	// --- plain text flavors ----------------------------------------------------

	/**
	 * Returns whether or not the specified data flavor is an plain flavor that
	 * is supported.
	 * @param flavor the requested flavor for the data
	 * @return boolean indicating whether or not the data flavor is supported
	 */
	protected boolean isPlainFlavor(DataFlavor flavor) {
		DataFlavor[] flavors = plainFlavors;
		for (int i = 0; i < flavors.length; i++) {
			if (flavors[i].equals(flavor)) {
				return true;
			}
		}
		return false;
	}

	/**
	 * Whether the plain text flavors are offered. If so, the method
	 * getPlainData should be implemented to provide something reasonable.
	 */
	protected boolean isPlainSupported() {
		return false;
	}

	/**
	 * Fetch the data in a text/plain format.
	 */
	protected String getPlainData() {
		return null;
	}

	// --- string flavorss --------------------------------------------------------

	/**
	 * Returns whether or not the specified data flavor is a String flavor that
	 * is supported.
	 * @param flavor the requested flavor for the data
	 * @return boolean indicating whether or not the data flavor is supported
	 */
	protected boolean isStringFlavor(DataFlavor flavor) {
		DataFlavor[] flavors = stringFlavors;
		for (int i = 0; i < flavors.length; i++) {
			if (flavors[i].equals(flavor)) {
				return true;
			}
		}
		return false;
	}

}