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/*
* @(#)DefaultTransferable.java
*
* Copyright (c) 2002-2010 Werner Randelshofer, Immensee, Switzerland.
* All rights reserved.
*
* You may not use, copy or modify this file, except in compliance with the
* license agreement you entered into with Werner Randelshofer.
* For details see accompanying license terms.
*/
package ch.randelshofer.quaqua.datatransfer;
import java.io.*;
import java.awt.datatransfer.*;
/**
* A Transferable which uses a char array or a byte array as its data source.
*
* @author Werner Randelshofer
* @version $Id: DefaultTransferable.java 363 2010-11-21 17:41:04Z wrandelshofer $
*/
public class DefaultTransferable implements Transferable {
private byte[] data;
private DataFlavor flavor;
/**
* Creates a new instance using a String as the data source.
* The charset parameter of the mimetype is used to convert the chars
* into bytes.
* If no charset parameter is specified ;charset="UTF-8" is
* added and the data is encoded using UTF-8.
*/
public DefaultTransferable(String data, String mimetype, String description) {
this(data.toCharArray(), mimetype, description);
}
/**
* Creates a new instance using a char array as the data source.
* The charset parameter of the mimetype is used to convert the chars
* into bytes.
* If no charset parameter is specified ;charset="UTF-8" is
* added and the data is encoded using UTF-8.
*/
public DefaultTransferable(char[] chars, String mimetype, String description) {
try {
MimeType mt = new MimeType(mimetype);
String charset = mt.getParameter("charset");
if (charset == null) {
charset = "UTF-8";
mt.setParameter("charset", charset);
}
this.data = new String(chars).getBytes(charset);
this.flavor = new DataFlavor(mt.toString(), description);
} catch (Exception e) {
InternalError error = new InternalError(e.getMessage());
error.initCause(e);
throw error;
}
}
/**
* Creates a new instance using a byte array as the data source.
*
* Note: For efficiency reasons this method stores the passed in array
* internally without copying it. Do not modify the array after
* invoking this method.
*/
public DefaultTransferable(byte[] data, String mimetype, String description) {
this.data = data;
this.flavor = new DataFlavor(mimetype, description);
}
/**
* 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 (flavor.equals(this.flavor)) {
//return new CharArrayReader(data);
return new ByteArrayInputStream(data);
} else {
throw new UnsupportedFlavorException(flavor);
}
}
/**
* 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() {
return new DataFlavor[] {flavor};
}
/**
* Returns whether or not the specified data flavor is supported for
* this object.
* @param flavor the requested flavor for the data
* @return boolean indicating wjether or not the data flavor is supported
*/
public boolean isDataFlavorSupported(DataFlavor flavor) {
return flavor.equals(this.flavor);
}
}