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/*******************************************************************************
* Copyright (c) 2000, 2012 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.dnd;
import org.eclipse.swt.internal.ole.win32.*;
import org.eclipse.swt.internal.win32.*;
/**
* The class <code>FileTransfer</code> provides a platform specific mechanism
* for converting a list of files represented as a java <code>String[]</code> to a
* platform specific representation of the data and vice versa.
* Each <code>String</code> in the array contains the absolute path for a single
* file or directory.
*
* <p>An example of a java <code>String[]</code> containing a list of files is shown
* below:</p>
*
* <pre><code>
* File file1 = new File("C:\temp\file1");
* File file2 = new File("C:\temp\file2");
* String[] fileData = new String[2];
* fileData[0] = file1.getAbsolutePath();
* fileData[1] = file2.getAbsolutePath();
* </code></pre>
*
* @see Transfer
*/
public class FileTransfer extends ByteArrayTransfer {
private static FileTransfer _instance = new FileTransfer();
private static final String CF_HDROP = "CF_HDROP "; //$NON-NLS-1$
private static final int CF_HDROPID = COM.CF_HDROP;
private FileTransfer() {}
/**
* Returns the singleton instance of the FileTransfer class.
*
* @return the singleton instance of the FileTransfer class
*/
public static FileTransfer getInstance () {
return _instance;
}
/**
* This implementation of <code>javaToNative</code> converts a list of file names
* represented by a java <code>String[]</code> to a platform specific representation.
* Each <code>String</code> in the array contains the absolute path for a single
* file or directory.
*
* @param object a java <code>String[]</code> containing the file names to be converted
* @param transferData an empty <code>TransferData</code> object that will
* be filled in on return with the platform specific format of the data
*
* @see Transfer#nativeToJava
*/
@Override
public void javaToNative(Object object, TransferData transferData) {
if (!checkFile(object) || !isSupportedType(transferData)) {
DND.error(DND.ERROR_INVALID_DATA);
}
String[] fileNames = (String[]) object;
StringBuffer allFiles = new StringBuffer();
for (int i = 0; i < fileNames.length; i++) {
allFiles.append(fileNames[i]);
allFiles.append('\0'); // each name is null terminated
}
allFiles.append('\0'); // there is an extra null terminator at the very end
char [] buffer = new char [allFiles.length()];
allFiles.getChars(0, allFiles.length(), buffer, 0);
DROPFILES dropfiles = new DROPFILES();
dropfiles.pFiles = DROPFILES.sizeof;
dropfiles.pt_x = dropfiles.pt_y = 0;
dropfiles.fNC = 0;
dropfiles.fWide = 1;
// Allocate the memory because the caller (DropTarget) has not handed it in
// The caller of this method must release the data when it is done with it.
int byteCount = buffer.length * TCHAR.sizeof;
long /*int*/ newPtr = OS.GlobalAlloc(COM.GMEM_FIXED | COM.GMEM_ZEROINIT, DROPFILES.sizeof + byteCount);
OS.MoveMemory(newPtr, dropfiles, DROPFILES.sizeof);
OS.MoveMemory(newPtr + DROPFILES.sizeof, buffer, byteCount);
transferData.stgmedium = new STGMEDIUM();
transferData.stgmedium.tymed = COM.TYMED_HGLOBAL;
transferData.stgmedium.unionField = newPtr;
transferData.stgmedium.pUnkForRelease = 0;
transferData.result = COM.S_OK;
}
/**
* This implementation of <code>nativeToJava</code> converts a platform specific
* representation of a list of file names to a java <code>String[]</code>.
* Each String in the array contains the absolute path for a single file or directory.
*
* @param transferData the platform specific representation of the data to be converted
* @return a java <code>String[]</code> containing a list of file names if the conversion
* was successful; otherwise null
*
* @see Transfer#javaToNative
*/
@Override
public Object nativeToJava(TransferData transferData) {
if (!isSupportedType(transferData) || transferData.pIDataObject == 0) return null;
// get file names from IDataObject
IDataObject dataObject = new IDataObject(transferData.pIDataObject);
dataObject.AddRef();
FORMATETC formatetc = new FORMATETC();
formatetc.cfFormat = COM.CF_HDROP;
formatetc.ptd = 0;
formatetc.dwAspect = COM.DVASPECT_CONTENT;
formatetc.lindex = -1;
formatetc.tymed = COM.TYMED_HGLOBAL;
STGMEDIUM stgmedium = new STGMEDIUM();
stgmedium.tymed = COM.TYMED_HGLOBAL;
transferData.result = getData(dataObject, formatetc, stgmedium);
dataObject.Release();
if (transferData.result != COM.S_OK) return null;
// How many files are there?
int count = OS.DragQueryFile(stgmedium.unionField, 0xFFFFFFFF, null, 0);
String[] fileNames = new String[count];
for (int i = 0; i < count; i++) {
// How long is the name ?
int size = OS.DragQueryFile(stgmedium.unionField, i, null, 0);
char [] lpszFile = new char [size + 1];
// Get file name and append it to string
OS.DragQueryFile(stgmedium.unionField, i, lpszFile, size + 1);
fileNames[i] = new String(lpszFile, 0, size);
}
OS.DragFinish(stgmedium.unionField); // frees data associated with HDROP data
return fileNames;
}
@Override
protected int[] getTypeIds(){
return new int[] {CF_HDROPID};
}
@Override
protected String[] getTypeNames(){
return new String[] {CF_HDROP};
}
boolean checkFile(Object object) {
if (object == null || !(object instanceof String[]) || ((String[])object).length == 0) return false;
String[] strings = (String[])object;
for (int i = 0; i < strings.length; i++) {
if (strings[i] == null || strings[i].length() == 0) return false;
}
return true;
}
@Override
protected boolean validate(Object object) {
return checkFile(object);
}
}
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