org.eclipse.wb.internal.swing.model.component.exposed.SwingHierarchyProvider.java Source code

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Here is the source code for org.eclipse.wb.internal.swing.model.component.exposed.SwingHierarchyProvider.java

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/*******************************************************************************
 * Copyright (c) 2011 Google, Inc.
 * 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:
 *    Google, Inc. - initial API and implementation
 *******************************************************************************/
package org.eclipse.wb.internal.swing.model.component.exposed;

import org.eclipse.wb.internal.core.model.JavaInfoUtils.HierarchyProvider;

import org.apache.commons.lang.ArrayUtils;

import java.awt.Component;
import java.awt.Container;

import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;

/**
 * Implementation of {@link HierarchyProvider} for Swing components.
 * 
 * @author mitin_aa
 * @coverage swing.model
 */
public final class SwingHierarchyProvider extends HierarchyProvider {
    ////////////////////////////////////////////////////////////////////////////
    //
    // HierarchyProvider
    //
    ////////////////////////////////////////////////////////////////////////////
    @Override
    public Object getParentObject(Object object) throws Exception {
        if (object instanceof JMenuItem) {
            return getJMenu((JMenuItem) object);
        }
        if (object instanceof Component) {
            Component component = (Component) object;
            return component.getParent();
        }
        return null;
    }

    @Override
    public Object[] getChildrenObjects(Object object) throws Exception {
        // javax.swing.JMenu
        if (object instanceof JMenu) {
            JMenu menu = (JMenu) object;
            int componentCount = menu.getMenuComponentCount();
            Component[] menuComponents = new Component[componentCount];
            for (int i = 0; i < componentCount; i++) {
                menuComponents[i] = menu.getMenuComponent(i);
            }
            return menuComponents;
        }
        // generic java.awt.Container
        if (object instanceof Container) {
            Container container = (Container) object;
            return container.getComponents();
        }
        // unknown
        return ArrayUtils.EMPTY_OBJECT_ARRAY;
    }

    ////////////////////////////////////////////////////////////////////////////
    //
    // Utils
    //
    ////////////////////////////////////////////////////////////////////////////
    /**
     * There are no good way to find {@link JMenu} parent of {@link JMenuItem}, see
     * http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4103931
     */
    private static Component getJMenu(JMenuItem item) {
        if (item.getParent() instanceof JPopupMenu) {
            JPopupMenu popup = (JPopupMenu) item.getParent();
            return popup.getInvoker();
        }
        return item.getParent();
    }
}