/*******************************************************************************
* Copyright (c) 2003, 2015 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.ui.internal.dialogs;
import java.util.ArrayList;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.ui.model.AdaptableList;
/**
* Provider used by the NewWizardNewPage.
*
* @since 3.0
*/
public class WizardContentProvider implements ITreeContentProvider {
private AdaptableList input;
@Override
public void dispose() {
input = null;
}
@Override
public Object[] getChildren(Object parentElement) {
if (parentElement instanceof WizardCollectionElement) {
ArrayList list = new ArrayList();
WizardCollectionElement element = (WizardCollectionElement) parentElement;
for (Object childCollection : element.getChildren()) {
handleChild(childCollection, list);
}
for (Object childWizard : element.getWizards()) {
handleChild(childWizard, list);
}
// flatten lists with only one category
if (list.size() == 1
&& list.get(0) instanceof WizardCollectionElement) {
return getChildren(list.get(0));
}
return list.toArray();
} else if (parentElement instanceof AdaptableList) {
AdaptableList aList = (AdaptableList) parentElement;
Object[] children = aList.getChildren();
ArrayList list = new ArrayList(children.length);
for (Object element : children) {
handleChild(element, list);
}
// if there is only one category, return it's children directly (flatten list)
if (list.size() == 1
&& list.get(0) instanceof WizardCollectionElement) {
return getChildren(list.get(0));
}
return list.toArray();
} else {
return new Object[0];
}
}
@Override
public Object[] getElements(Object inputElement) {
return getChildren(inputElement);
}
@Override
public Object getParent(Object element) {
if (element instanceof WizardCollectionElement) {
for (Object child : input.getChildren()) {
if (child.equals(element)) {
return input;
}
}
return ((WizardCollectionElement) element).getParent(element);
}
return null;
}
/**
* Adds the item to the list, unless it's a collection element without any children.
*
* @param element the element to test and add
* @param list the <code>Collection</code> to add to.
* @since 3.0
*/
private void handleChild(Object element, ArrayList list) {
if (element instanceof WizardCollectionElement) {
if (hasChildren(element)) {
list.add(element);
}
} else {
list.add(element);
}
}
@Override
public boolean hasChildren(Object element) {
if (element instanceof WizardCollectionElement) {
if (getChildren(element).length > 0) {
return true;
}
}
return false;
}
@Override
public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
input = (AdaptableList) newInput;
}
}