/*******************************************************************************
* 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.model.widgets;
import com.google.gdt.eclipse.designer.model.widgets.cell.CellTableInfo;
import org.eclipse.wb.core.model.JavaInfo;
import org.eclipse.wb.internal.core.model.JavaInfoUtils.HierarchyProvider;
import org.eclipse.wb.internal.core.utils.ast.AstEditor;
import org.eclipse.wb.internal.core.utils.reflect.ReflectionUtils;
import org.eclipse.wb.internal.core.utils.state.EditorState;
import org.apache.commons.lang.ArrayUtils;
import java.util.List;
/**
* Implementation of {@link HierarchyProvider} for GWT.
*
* @author scheglov_ke
* @coverage gwt.model
*/
public final class GwtHierarchyProvider extends HierarchyProvider {
////////////////////////////////////////////////////////////////////////////
//
// Instance
//
////////////////////////////////////////////////////////////////////////////
public static final HierarchyProvider INSTANCE = new GwtHierarchyProvider();
private GwtHierarchyProvider() {
}
////////////////////////////////////////////////////////////////////////////
//
// HierarchyProvider
//
////////////////////////////////////////////////////////////////////////////
@Override
public Object[] getAliases(Object object) throws Exception {
if (isUserClass(object, "com.smartgwt.client.widgets.BaseWidget")) {
return new Object[]{object};
}
if (isUserClass(object, "com.google.gwt.user.client.ui.UIObject")) {
return new Object[]{object, ReflectionUtils.invokeMethod(object, "getElement()")};
}
// unknown
return null;
}
@Override
public Object getParentObject(Object object) throws Exception {
// com.google.gwt.user.client.ui.Widget
if (isUserClass(object, "com.google.gwt.user.client.ui.Widget")) {
return ReflectionUtils.invokeMethod(object, "getParent()");
}
// com.google.gwt.user.client.Element
if (isUserClass(object, "com.google.gwt.user.client.Element")) {
Class<?> domClass = getEditorLoader().loadClass("com.google.gwt.user.client.DOM");
return ReflectionUtils.invokeMethod(
domClass,
"getParent(com.google.gwt.user.client.Element)",
object);
}
// unknown
return null;
}
@Override
public Object[] getChildrenObjects(Object object) throws Exception {
// com.google.gwt.user.cellview.client.CellTable
if (isUserClass(object, "com.google.gwt.user.cellview.client.CellTable")) {
List<?> columnList = CellTableInfo.getColumnObjects(object);
return columnList.toArray(new Object[columnList.size()]);
}
// com.google.gwt.user.client.ui.IndexedPanel
if (isUserClass(object, "com.google.gwt.user.client.ui.IndexedPanel")) {
int widgetCount = (Integer) ReflectionUtils.invokeMethod(object, "getWidgetCount()");
Object widgets[] = new Object[widgetCount];
for (int i = 0; i < widgetCount; i++) {
widgets[i] = ReflectionUtils.invokeMethod(object, "getWidget(int)", i);
}
return widgets;
}
// com.google.gwt.user.client.ui.IndexedPanel
if (isUserClass(object, "com.google.gwt.user.client.ui.Composite")) {
Object widget = ReflectionUtils.invokeMethod(object, "getWidget()");
if (widget != null) {
return new Object[]{widget};
}
}
// com.google.gwt.user.client.Element
if (isUserClass(object, "com.google.gwt.user.client.Element")) {
Class<?> domClass = getEditorLoader().loadClass("com.google.gwt.user.client.DOM");
int childCount =
(Integer) ReflectionUtils.invokeMethod(
domClass,
"getChildCount(com.google.gwt.user.client.Element)",
object);
Object children[] = new Object[childCount];
for (int i = 0; i < childCount; i++) {
children[i] =
ReflectionUtils.invokeMethod(
domClass,
"getChild(com.google.gwt.user.client.Element,int)",
object,
i);
}
return children;
}
// unknown
return ArrayUtils.EMPTY_OBJECT_ARRAY;
}
////////////////////////////////////////////////////////////////////////////
//
// Internal
//
////////////////////////////////////////////////////////////////////////////
/**
* @return the {@link ClassLoader} of active {@link JavaInfo} hierarchy.
*/
private static ClassLoader getEditorLoader() {
AstEditor editor = EditorState.getActiveJavaInfo().getEditor();
return EditorState.get(editor).getEditorLoader();
}
/**
* @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);
}
}