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/*****************************************************************************
* Copyright (c) 2014 Jonathan Geoffroy.
*
*
* 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:
* Jonathan Geoffroy geoffroy.jonathan@gmail.com - initial implementation
*
*****************************************************************************/
package org.eclipse.papyrus.java.reverse.ui.dnd;
import java.util.List;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.resources.IProject;
import org.eclipse.gef.Request;
import org.eclipse.gef.commands.Command;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.papyrus.java.reverse.ui.DndReverseCodeHandler;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.PlatformUI;
/**
* Command called when user drop Java Elements into diagram model (on Papyrus editor).
* Check for selected elements, and run reverse handler if all selected files are reversible.
*
* This command implements a Singleton Pattern. You should use ReverseCommand.getInstance() to receive a Singleton of this Command.
*
* @author Jonathan Geoffroy
*
*/
public class DropReverseCommand extends Command {
/**
* Singleton implementation of ReverseCommand
* Always return this instance of Reverse Command when ask for instance
*
* @see {getInstance()}
*/
private static DropReverseCommand instance;
/**
* Constructor. Initialize the request for this ReverseCommand
*/
private DropReverseCommand() {
super();
}
@Override
public boolean canExecute() {
// Find the type of each selected file (CompilationUnit, packages ...)
List selected; // The selected files from JDT
IWorkbenchPage page = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
ISelection selection = page.getSelection();
if (!(selection instanceof IStructuredSelection)) {
return false;
}
IStructuredSelection structuredSelection = (IStructuredSelection) selection;
selected = structuredSelection.toList();
// For each selected object, check if it's reversible.
for (Object s : selected) {
// We can only reverse Java Elements. Moreover, reversing projects is not available yet
if (!(s instanceof IJavaElement) || s instanceof IProject) {
return false;
}
}
return true;
}
@Override
public void execute() {
DndReverseCodeHandler reverse = new DndReverseCodeHandler();
try {
reverse.execute(null);
} catch (ExecutionException e) {
e.printStackTrace();
}
}
/**
* return a singleton of this command
* Change the request if it differ from the previous calling
*
*
* @return a singleton of this command
*/
public static DropReverseCommand getInstance(Request request) {
if (instance == null) {
instance = new DropReverseCommand();
}
return instance;
}
}
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