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package org.fife.ui.hex.swing;

import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.IOException;
import java.io.StringReader;


/**
 * A Transferable that transfers an array of bytes.
 *
 * @author Robert Futrell
 * @version 1.0
 */
class ByteArrayTransferable implements Transferable {

	private int offset;
	private byte[] bytes;

	private static final DataFlavor[] FLAVORS = {
		DataFlavor.stringFlavor,
		DataFlavor.plainTextFlavor,
	};


	/**
	 * Creates a transferable object.
	 *
	 * @param bytes The bytes to transfer.
	 */
	public ByteArrayTransferable(int offset, byte[] bytes) {
		this.offset = offset;
		if (bytes!=null) {
			this.bytes = (byte[])bytes.clone();
		}
		else {
			this.bytes = new byte[0];
		}
	}


	/**
	 * Returns the number of bytes being transferred.
	 *
	 * @return The number of bytes being transferred.
	 * @see #getOffset()
	 */
	public int getLength() {
		return bytes.length;
	}


	/**
	 * Returns the offset of the first byte being transferred.
	 *
	 * @return The offset of the first byte.
	 * @see #getLength()
	 */
	public int getOffset() {
		return offset;
	}


	/**
	 * Returns the data being transferred in a format specified by the
	 * DataFlavor.
	 *
	 * @param flavor Dictates in what format the data should be returned.
	 * @throws UnsupportedFlavorException If the specified flavor is not
	 *         supported.
	 * @throws IOException If an IO error occurs.
	 * @see DataFlavor#getRepresentationClass()
	 */
	public Object getTransferData(DataFlavor flavor)
			throws UnsupportedFlavorException, IOException {
		if (flavor.equals(FLAVORS[0])) {
			return new String(bytes); // Use platform default charset.
		}
		else if (flavor.equals(FLAVORS[1])) {
			return new StringReader(new String(bytes));
		}
	    throw new UnsupportedFlavorException(flavor);
	}


	/**
	 * Returns an array of DataFlavor objects indicating the flavors the data 
	 * can be provided in.  The array is 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() {
		return (DataFlavor[])FLAVORS.clone();
	}


	/**
	 * Returns whether a data flavor is supported.
	 *
	 * @param flavor The flavor to check.
	 * @return Whether the specified flavor is supported.
	 */
	public boolean isDataFlavorSupported(DataFlavor flavor) {
		for (int i=0; i