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/*******************************************************************************
 * Copyright (c) 2003, 2015 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jface.preference;

import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.Viewer;

/**
 * Provides a tree model for PreferenceManager content.
 *
 * @since 3.0
 */
public class PreferenceContentProvider implements ITreeContentProvider {

	private PreferenceManager manager;

	@Override
	public void dispose() {
		manager = null;
	}

	/**
	 * Find the parent of the provided node.  Will search recursivly through the
	 * preference tree.
	 *
	 * @param parent the possible parent node.
	 * @param target the target child node.
	 * @return the parent node of the child node.
	 */
	private IPreferenceNode findParent(IPreferenceNode parent,
			IPreferenceNode target) {
		if (parent.getId().equals(target.getId())) {
			return null;
		}

		IPreferenceNode found = parent.findSubNode(target.getId());
		if (found != null) {
			return parent;
		}

		IPreferenceNode[] children = parent.getSubNodes();

		for (IPreferenceNode element : children) {
			found = findParent(element, target);
			if (found != null) {
				return found;
			}
		}

		return null;
	}

	@Override
	public Object[] getChildren(Object parentElement) {//must be an instance of IPreferenceNode.
		return ((IPreferenceNode) parentElement).getSubNodes();
	}

	@Override
	public Object[] getElements(Object inputElement) {// must be an instance of PreferenceManager.
		return getChildren(((PreferenceManager) inputElement).getRoot());
	}

	@Override
	public Object getParent(Object element) {//must be an instance of IPreferenceNode.
		IPreferenceNode targetNode = (IPreferenceNode) element;
		IPreferenceNode root = manager.getRoot();
		return findParent(root, targetNode);
	}

	@Override
	public boolean hasChildren(Object element) {
		return getChildren(element).length > 0;
	}

	@Override
	public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
		manager = (PreferenceManager) newInput;
	}
	/**
	 * Set the manager for the preferences.
	 * @param manager The manager to set.
	 *
	 * @since 3.1
	 */
	protected void setManager(PreferenceManager manager) {
		this.manager = manager;
	}
}