/*
* Created on 01.12.2003
* Copyright (C) 2003, 2004, 2005, 2006 Aelitis, All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* AELITIS, SAS au capital de 46,603.30 euros
* 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
*
*/
package org.gudy.azureus2.ui.swt;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import org.eclipse.swt.dnd.ByteArrayTransfer;
import org.eclipse.swt.dnd.TransferData;
import org.gudy.azureus2.core3.util.Debug;
import org.gudy.azureus2.core3.util.UrlUtils;
/**
* URL Transfer type for Drag and Drop of URLs
* Windows IDs are already functional.
*
* Please use Win32TransferTypes to determine the IDs for other OSes!
*
* @see org.gudy.azureus2.ui.swt.test.Win32TransferTypes
* @author Rene Leonhardt
*
* @author TuxPaper (require incoming string types have an URL prefix)
* @author TuxPaper (UTF-8, UTF-16, BOM stuff)
*
* TuxPaper's Notes:
* This class is flakey. It's better to use HTMLTransfer, and then parse
* the URL from the HTML. However, IE drag and drops do not support
* HTMLTransfer, so this class must stay
*
* Windows
* ---
* TypeIDs seem to be assigned differently on different platform versions
* (or maybe even different installations!). Here's some examples
* 49314: Moz/IE 0x01 4-0x00 0x80 lots-of-0x00 "[D]URL" lots-more-0x00
* 49315: Moz/IE Same as 49315, except unicode
* 49313: Moz/IE URL in .url format "[InternetShortcut]\nURL=%1"
* 49324: Moz/IE URL in text format
* 49395: Moz Same as 49324, except unicode
* 49319: Moz Dragged HTML Fragment with position information
* 49398: Moz Dragged HTML Fragment (NO position information, just HTML), unicode
* 49396: Moz HTML. Unknown.
*
* There's probably a link to the ID and they type name in the registry, or
* via a Windows API call. We don't want to do that, and fortunately,
* SWT doesn't seem to pay attention to getTypeIds() on Windows, so we check
* every typeid we get to see if we can parse an URL from it.
*
* Also, dragging from the IE URL bar hangs SWT (sometimes for a very long
* time). Fortunately, most people willdrag the URL from the actual content
* window.
*
* Dragging an IE bookmark is actually dragging the .url file, and should be
* handled by the FileTranfer (and then opening it and extracting the URL).
* Moz Bookmarks are processed as HTML.
*
* Linux
* ---
* For Linux, this class isn't required.
* HTMLTransfer will take care of Gecko and Konquerer.
*
* Opera
* ---
* As of 8.5, Opera still doesn't allow dragging outside of itself (at least on
* windows)
*
*/
public class URLTransfer extends ByteArrayTransfer {
/** We are in the process of checking a string to see if it's a valid URL */
private boolean bCheckingString = false;
private static boolean DEBUG = false;
private static URLTransfer _instance = new URLTransfer();
// Opera 7 LINK DRAG & DROP IMPOSSIBLE (just inside Opera)
private static final String[] supportedTypes = new String[] {
"CF_UNICODETEXT",
"CF_TEXT",
"OEM_TEXT"
};
private static final int[] supportedTypeIds = new int[] {
13,
1,
17
};
public static URLTransfer getInstance() {
return _instance;
}
public void javaToNative(Object object, TransferData transferData) {
if (DEBUG)
System.out.println("javaToNative called");
if (object == null || !(object instanceof URLType[]))
return;
if (isSupportedType(transferData)) {
URLType[] myTypes = (URLType[]) object;
try {
// write data to a byte array and then ask super to convert to pMedium
ByteArrayOutputStream out = new ByteArrayOutputStream();
DataOutputStream writeOut = new DataOutputStream(out);
for (int i = 0, length = myTypes.length; i < length; i++) {
writeOut.writeBytes(myTypes[i].linkURL);
writeOut.writeBytes("\n");
writeOut.writeBytes(myTypes[i].linkText);
}
byte[] buffer = out.toByteArray();
writeOut.close();
super.javaToNative(buffer, transferData);
} catch (IOException e) {
}
}
}
public Object nativeToJava(TransferData transferData) {
if (DEBUG) System.out.println("nativeToJava called");
try {
if (isSupportedType(transferData)) {
byte [] buffer = (byte[]) super.nativeToJava(transferData);
return bytebufferToJava(buffer);
}
} catch (Exception e) {
Debug.out(e);
}
return null;
}
public URLType bytebufferToJava(byte[] buffer) {
if (buffer == null) {
if (DEBUG) System.out.println("buffer null");
return null;
}
URLType myData = null;
try {
String data;
if (buffer.length > 1) {
if (DEBUG) {
for (int i = 0; i < buffer.length; i++) {
if (buffer[i] >= 32)
System.out.print(((char) buffer[i]));
else
System.out.print("#");
}
System.out.println();
}
boolean bFirst0 = buffer[0] == 0;
boolean bSecond0 = buffer[1] == 0;
if (bFirst0 && bSecond0)
// This is probably UTF-32 Big Endian.
// Let's hope default constructor can handle it (It can't)
data = new String(buffer);
else if (bFirst0)
data = new String(buffer, "UTF-16BE");
else if (bSecond0)
data = new String(buffer, "UTF-16LE");
else if (buffer[0] == (byte) 0xEF && buffer[1] == (byte) 0xBB
&& buffer.length > 3 && buffer[2] == (byte) 0xBF)
data = new String(buffer, 3, buffer.length - 3, "UTF-8");
else if (buffer[0] == (byte) 0xFF || buffer[0] == (byte) 0xFE)
data = new String(buffer, "UTF-16");
else {
data = new String(buffer);
}
} else {
// Older Code:
// Remove 0 values from byte array, messing up any Unicode strings
byte[] text = new byte[buffer.length];
int j = 0;
for (int i = 0; i < buffer.length; i++) {
if (buffer[i] != 0)
text[j++] = buffer[i];
}
data = new String(text, 0, j);
}
int iPos = data.indexOf("\nURL=");
if (iPos > 0) {
int iEndPos = data.indexOf("\r", iPos);
if (iEndPos < 0) {
iEndPos = data.length();
}
myData = new URLType();
myData.linkURL = data.substring(iPos + 5, iEndPos);
myData.linkText = "";
} else {
String[] split = data.split("[\r\n]+", 2);
myData = new URLType();
myData.linkURL = (split.length > 0) ? split[0] : "";
myData.linkText = (split.length > 1) ? split[1] : "";
}
} catch (Exception ex) {
ex.printStackTrace();
}
return myData;
}
protected String[] getTypeNames() {
return supportedTypes;
}
protected int[] getTypeIds() {
return supportedTypeIds;
}
/**
* @param transferData
* @see org.eclipse.swt.dnd.Transfer#isSupportedType(org.eclipse.swt.dnd.TransferData)
* @return
*/
public boolean isSupportedType(TransferData transferData) {
if (bCheckingString)
return true;
if (transferData == null)
return false;
// TODO: Check if it's a string list of URLs
// String -- Check if URL, skip to next if not
URLType url = null;
if (DEBUG) System.out.println("Checking if type #" + transferData.type + " is URL");
bCheckingString = true;
try {
byte[] buffer = (byte[]) super.nativeToJava(transferData);
url = bytebufferToJava(buffer);
} catch (Exception e) {
Debug.out(e);
} finally {
bCheckingString = false;
}
if (url == null) {
if (DEBUG) System.out.println("no, Null URL for type #" + transferData.type);
return false;
}
if (UrlUtils.isURL(url.linkURL, false)) {
if (DEBUG) System.out.println("Yes, " + url.linkURL + " of type #" + transferData.type);
return true;
}
if (DEBUG) System.out.println("no, " + url.linkURL + " not URL for type #" + transferData.type);
return false;
}
/**
* Sometimes, CF_Text will be in currentDataType even though CF_UNICODETEXT
* is present. This is a workaround until its fixed properly.
* <p>
* Place it in <code>dropAccept</code>
*
* <pre>
*if (event.data instanceof URLTransfer.URLType)
* event.currentDataType = URLTransfer.pickBestType(event.dataTypes, event.currentDataType);
* </pre>
*
* @param dataTypes
* @param def
* @return
*/
public static TransferData pickBestType(TransferData[] dataTypes,
TransferData def) {
for (int i = 0; i < supportedTypeIds.length; i++) {
int supportedTypeID = supportedTypeIds[i];
for (int j = 0; j < dataTypes.length; j++) {
try {
TransferData data = dataTypes[j];
if (supportedTypeID == data.type)
return data;
} catch (Throwable t) {
Debug.out("Picking Best Type", t);
}
}
}
return def;
}
public class URLType {
public String linkURL;
public String linkText;
public String toString() {
return linkURL + "\n" + linkText;
}
}
/**
* Test for varioud UTF Strings
* BOM information from http://www.unicode.org/faq/utf_bom.html
* @param args
*/
public static void main(String[] args) {
Map map = new LinkedHashMap();
map.put("UTF-8", new byte[] { (byte) 0xEF, (byte) 0xbb, (byte) 0xbf, 'H',
'i' });
map.put("UTF-32 BE BOM", new byte[] { 0, 0, (byte) 0xFE, (byte) 0xFF, 'H',
0, 0, 0, 'i', 0, 0, 0 });
map.put("UTF-16 LE BOM", new byte[] { (byte) 0xFF, (byte) 0xFE, 'H', 0,
'i', 0 });
map.put("UTF-16 BE BOM", new byte[] { (byte) 0xFE, (byte) 0xFF, 0, 'H', 0,
'i' });
map.put("UTF-16 LE", new byte[] { 'H', 0, 'i', 0 });
map.put("UTF-16 BE", new byte[] { 0, 'H', 0, 'i' });
for (Iterator iterator = map.keySet().iterator(); iterator.hasNext();) {
String element = (String) iterator.next();
System.out.println(element + ":");
byte[] buffer = (byte[]) map.get(element);
boolean bFirst0 = buffer[0] == 0;
boolean bSecond0 = buffer[1] == 0;
String data = "";
try {
if (bFirst0 && bSecond0)
// This is probably UTF-32 Big Endian.
// Let's hope default constructor can handle it (It can't)
data = new String(buffer);
else if (bFirst0)
data = new String(buffer, "UTF-16BE");
else if (bSecond0)
data = new String(buffer, "UTF-16LE");
else if (buffer[0] == (byte) 0xEF && buffer[1] == (byte) 0xBB
&& buffer.length > 3 && buffer[2] == (byte) 0xBF)
data = new String(buffer, 3, buffer.length - 3, "UTF-8");
else if (buffer[0] == (byte) 0xFF || buffer[0] == (byte) 0xFE)
data = new String(buffer, "UTF-16");
else {
data = new String(buffer);
}
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(data);
}
}
}