/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.uiautomator.tree;


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

public class BasicTreeNodeContentProvider implements ITreeContentProvider {

    private static final Object[] EMPTY_ARRAY = {};

    @Override
    public void dispose() {
    }

    @Override
    public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
    }

    @Override
    public Object[] getElements(Object inputElement) {
        return getChildren(inputElement);
    }

    @Override
    public Object[] getChildren(Object parentElement) {
        if (parentElement instanceof BasicTreeNode) {
            return ((BasicTreeNode)parentElement).getChildren();
        }
        return EMPTY_ARRAY;
    }

    @Override
    public Object getParent(Object element) {
        if (element instanceof BasicTreeNode) {
            return ((BasicTreeNode)element).getParent();
        }
        return null;
    }

    @Override
    public boolean hasChildren(Object element) {
        if (element instanceof BasicTreeNode) {
            return ((BasicTreeNode) element).hasChild();
        }
        return false;
    }
}