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/*******************************************************************************
* Copyright (c) 2000, 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.dnd;
import org.eclipse.swt.internal.Converter;
/**
* 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>
*
* <code><pre>
* 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 TYPENAME = "files";
private static final int TYPEID = registerType(TYPENAME);
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
*/
public void javaToNative(Object object, TransferData transferData) {
if (!checkFile(object) || !isSupportedType(transferData)) {
DND.error(DND.ERROR_INVALID_DATA);
}
// build a byte array from data
String[] files = (String[])object;
// create a string separated by "new lines" to represent list of files
String nativeFormat = "";
for (int i = 0, length = files.length; i < length; i++){
nativeFormat += "file:"+files[i]+"\r";
}
byte[] buffer = Converter.wcsToMbcs(null, nativeFormat, true);
// pass byte array on to super to convert to native
super.javaToNative(buffer, transferData);
}
/**
* 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
*/
public Object nativeToJava(TransferData transferData) {
byte[] data = (byte[])super.nativeToJava(transferData);
if (data == null) return null;
char[] unicode = Converter.mbcsToWcs(null, data);
String string = new String(unicode);
// parse data and convert string to array of files
int start = string.indexOf("file:");
if (start == -1) return null;
start += 5;
String[] fileNames = new String[0];
while (start < string.length()) {
int end = string.indexOf("\r", start);
if (end == -1) end = string.length() - 1;
String fileName = string.substring(start, end);
String[] newFileNames = new String[fileNames.length + 1];
System.arraycopy(fileNames, 0, newFileNames, 0, fileNames.length);
newFileNames[fileNames.length] = fileName;
fileNames = newFileNames;
start = string.indexOf("file:", end);
if (start == -1) break;
start += 5;
}
return fileNames;
}
protected String[] getTypeNames(){
return new String[]{TYPENAME};
}
protected int[] getTypeIds(){
return new int[]{TYPEID};
}
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;
}
protected boolean validate(Object object) {
return checkFile(object);
}
}
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