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/*******************************************************************************
* Copyright (c) 2004 - 2006 Mylar committers 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
*******************************************************************************/
package org.eclipse.mylyn.internal.tasks.ui;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import org.eclipse.mylyn.tasks.core.AbstractTask;
import org.eclipse.mylyn.tasks.ui.TasksUiPlugin;
import org.eclipse.swt.dnd.ByteArrayTransfer;
import org.eclipse.swt.dnd.TransferData;
/**
* @author Mik Kersten
*/
public class TaskTransfer extends ByteArrayTransfer {
private static final TaskTransfer INSTANCE = new TaskTransfer();
private static final String TYPE_NAME = "task-transfer-format:" + System.currentTimeMillis() + ":"
+ INSTANCE.hashCode();
private static final int TYPEID = registerType(TYPE_NAME);
private TaskTransfer() {
}
public static TaskTransfer getInstance() {
return INSTANCE;
}
@Override
protected int[] getTypeIds() {
return new int[] { TYPEID };
}
@Override
protected String[] getTypeNames() {
return new String[] { TYPE_NAME };
}
@Override
protected void javaToNative(Object data, TransferData transferData) {
if (!(data instanceof AbstractTask[])) {
return;
}
AbstractTask[] tasks = (AbstractTask[]) data;
int resourceCount = tasks.length;
try {
ByteArrayOutputStream out = new ByteArrayOutputStream();
DataOutputStream dataOut = new DataOutputStream(out);
//write the number of resources
dataOut.writeInt(resourceCount);
//write each resource
for (int i = 0; i < tasks.length; i++) {
writeResource(dataOut, tasks[i]);
}
//cleanup
dataOut.close();
out.close();
byte[] bytes = out.toByteArray();
super.javaToNative(bytes, transferData);
} catch (IOException e) {
//it's best to send nothing if there were problems
}
}
@Override
protected Object nativeToJava(TransferData transferData) {
byte[] bytes = (byte[]) super.nativeToJava(transferData);
if (bytes == null) {
return null;
}
DataInputStream in = new DataInputStream(new ByteArrayInputStream(bytes));
try {
int count = in.readInt();
AbstractTask[] results = new AbstractTask[count];
for (int i = 0; i < count; i++) {
results[i] = readTask(in);
}
return results;
} catch (IOException e) {
return null;
}
}
private AbstractTask readTask(DataInputStream dataIn) throws IOException {
String handle = dataIn.readUTF();
return TasksUiPlugin.getTaskListManager().getTaskList().getTask(handle);
}
private void writeResource(DataOutputStream dataOut, AbstractTask task) throws IOException {
dataOut.writeUTF(task.getHandleIdentifier());
}
}
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