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/*******************************************************************************
* Copyright (c) 2000, 2008 IBM Corporation and others.
* Portion Copyright (c) 2009-2010 compeople AG (http://www.compeople.de).
* 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
* Compeople AG - QtJambi/Qt based implementation for Windows/Mac OS X/Linux
*******************************************************************************/
package org.eclipse.swt.dnd;
/**
* 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 final String SEPARATOR = "\n";
private static final String URI_LIST = "text/uri-list"; //$NON-NLS-1$
private static final int URI_LIST_ID = registerType(URI_LIST);
private FileTransfer() {
}
private static FileTransfer _instance = new 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 (!checkStringArray(object) || !isSupportedType(transferData)) {
DND.error(DND.ERROR_INVALID_DATA);
}
boolean first = true;
StringBuilder sb = new StringBuilder();
String[] files = (String[]) object;
for (String file : files) {
if (file == null || file.length() == 0) {
continue;
}
System.out.println("dnd file: " + file);
if (first) {
first = false;
} else {
sb.append(SEPARATOR);
}
sb.append("file://");
sb.append(file);
}
transferData.data = sb.toString().getBytes();
transferData.format = URI_LIST;
}
/**
* 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) {
byte[] data = (byte[]) super.nativeToJava(transferData);
if (data == null) {
return null;
}
String[] files = new String(data).split(SEPARATOR);
return files;
}
@Override
protected int[] getTypeIds() {
return new int[] { URI_LIST_ID };
}
@Override
protected String[] getTypeNames() {
return new String[] { URI_LIST };
}
boolean checkStringArray(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;
}
}
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