com.google.gdt.eclipse.designer.smart.model.support.SmartGwtHierarchyProvider.java Source code

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Here is the source code for com.google.gdt.eclipse.designer.smart.model.support.SmartGwtHierarchyProvider.java

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/*******************************************************************************
 * Copyright 2011 Google Inc. All Rights Reserved.
 *
 * 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
 *
 * 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.google.gdt.eclipse.designer.smart.model.support;

import org.eclipse.wb.internal.core.model.JavaInfoUtils.HierarchyProvider;
import org.eclipse.wb.internal.core.utils.reflect.ReflectionUtils;

import org.apache.commons.lang.ArrayUtils;

/**
 * Implementation of {@link HierarchyProvider} for GWT.
 * 
 * @author sablin_aa
 * @coverage SmartGWT.model
 */
public final class SmartGwtHierarchyProvider extends HierarchyProvider {
    ////////////////////////////////////////////////////////////////////////////
    //
    // Instance
    //
    ////////////////////////////////////////////////////////////////////////////
    public static final HierarchyProvider INSTANCE = new SmartGwtHierarchyProvider();

    private SmartGwtHierarchyProvider() {
    }

    ////////////////////////////////////////////////////////////////////////////
    //
    // HierarchyProvider
    //
    ////////////////////////////////////////////////////////////////////////////
    @Override
    public Object[] getChildrenObjects(Object object) throws Exception {
        // com.smartgwt.client.widgets.layout.Layout
        if (isUserClass(object, "com.smartgwt.client.widgets.layout.Layout")) {
            return (Object[]) ReflectionUtils.invokeMethod(object, "getMembers()");
        }
        // com.smartgwt.client.widgets.Canvas
        /* failed for TabSet & probably some others
        if (isUserClass(object, "com.smartgwt.client.widgets.Canvas")) {
           return (Object[]) ReflectionUtils.invokeMethod(object, "getChildren()");
        }*/
        // unknown
        return ArrayUtils.EMPTY_OBJECT_ARRAY;
    }

    ////////////////////////////////////////////////////////////////////////////
    //
    // Internal
    //
    ////////////////////////////////////////////////////////////////////////////
    /**
     * @return <code>true</code> if given object is successor of given class.
     */
    private static boolean isUserClass(Object o, String className) {
        return o != null && ReflectionUtils.isSuccessorOf(o.getClass(), className);
    }
}