/*******************************************************************************
* Copyright (c) 2010 Neil Bartlett.
* 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:
* Neil Bartlett - initial API and implementation
*******************************************************************************/
package bndtools.editor.common;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import org.eclipse.core.resources.IResource;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IPackageFragment;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jface.util.LocalSelectionTransfer;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerDropAdapter;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.DropTargetEvent;
import org.eclipse.swt.dnd.TransferData;
import org.eclipse.ui.part.ResourceTransfer;
import bndtools.model.importanalysis.ImportPackage;
public abstract class PackageDropAdapter<T> extends ViewerDropAdapter {
public PackageDropAdapter(Viewer viewer) {
super(viewer);
}
protected abstract T createNewEntry(String packageName);
protected abstract void addRows(int index, Collection<T> rows);
protected abstract int indexOf(Object object);
@Override
public boolean validateDrop(Object target, int operation, TransferData transferType) {
return ResourceTransfer.getInstance().isSupportedType(transferType) || LocalSelectionTransfer.getTransfer().isSupportedType(transferType);
}
@Override
public void dragEnter(DropTargetEvent event) {
super.dragEnter(event);
event.detail = DND.DROP_COPY;
}
@Override
public boolean performDrop(Object data) {
int insertionIndex = -1;
Object target = getCurrentTarget();
if (target != null) {
insertionIndex = indexOf(target);
int loc = getCurrentLocation();
if (loc == LOCATION_ON || loc == LOCATION_AFTER)
insertionIndex++;
}
List<T> newEntries = new ArrayList<T>();
if (data instanceof IResource[]) {
for (IResource resource : (IResource[]) data) {
IJavaElement javaElement = JavaCore.create(resource);
if (javaElement instanceof IPackageFragment) {
newEntries.add(createNewEntry(javaElement.getElementName()));
}
}
} else if (data instanceof IStructuredSelection) {
Iterator< ? > iterator = ((IStructuredSelection) data).iterator();
while (iterator.hasNext()) {
Object element = iterator.next();
if (element instanceof IPackageFragment) {
IPackageFragment pkg = (IPackageFragment) element;
newEntries.add(createNewEntry(pkg.getElementName()));
} else if (element instanceof ImportPackage) {
ImportPackage pkg = (ImportPackage) element;
newEntries.add(createNewEntry(pkg.getName()));
}
}
}
addRows(insertionIndex, newEntries);
return true;
}
}