content: /*******************************************************************************
   * Copyright (c) 2000, 2008 IBM Corporation and others.
   * 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:
   *     IBM Corporation - initial API and implementation
   *******************************************************************************/
  package org.eclipse.wst.jsdt.internal.ui.browsing;
  
  import java.util.List;
  
  import org.eclipse.jface.viewers.ViewerFilter;
  import org.eclipse.swt.widgets.Composite;
  import org.eclipse.swt.widgets.Item;
  import org.eclipse.swt.widgets.Widget;
  import org.eclipse.wst.jsdt.core.IPackageFragment;
  import org.eclipse.wst.jsdt.core.JavaScriptModelException;
  import org.eclipse.wst.jsdt.internal.ui.JavaScriptPlugin;
  import org.eclipse.wst.jsdt.internal.ui.viewsupport.ColoredViewersManager;
  import org.eclipse.wst.jsdt.internal.ui.viewsupport.ProblemTreeViewer;
  
  /**
   * Special problem tree viewer to handle logical packages.
   */
  public class PackagesViewTreeViewer extends ProblemTreeViewer implements IPackagesViewViewer{
  
  	public PackagesViewTreeViewer(Composite parent, int style) {
  		super(parent, style);
  		ColoredViewersManager.install(this);
  	}
  
  	/*
  	 * @see org.eclipse.jface.viewers.StructuredViewer#mapElement(java.lang.Object, org.eclipse.swt.widgets.Widget)
  	 */
  	public void mapElement(Object element, Widget item) {
  		if (element instanceof LogicalPackage && item instanceof Item) {
  			LogicalPackage cp= (LogicalPackage) element;
  			IPackageFragment[] fragments= cp.getFragments();
  			for (int i= 0; i < fragments.length; i++) {
  				IPackageFragment fragment= fragments[i];
  				fResourceToItemsMapper.addToMap(fragment, (Item) item);
  			}
  		}
  		super.mapElement(element, item);
  	}
  
  	/*
  	 * @see org.eclipse.jface.viewers.StructuredViewer#unmapElement(java.lang.Object, org.eclipse.swt.widgets.Widget)
  	 */
  	public void unmapElement(Object element, Widget item) {
  
  		if (element instanceof LogicalPackage && item instanceof Item) {
  			LogicalPackage cp= (LogicalPackage) element;
  			IPackageFragment[] fragments= cp.getFragments();
  			for (int i= 0; i < fragments.length; i++) {
  				IPackageFragment fragment= fragments[i];
  				fResourceToItemsMapper.removeFromMap((Object)fragment, (Item)item);
  			}
  		}
  		super.unmapElement(element, item);
  	}
  	
  	/* (non-Javadoc)
  	 * @see org.eclipse.wst.jsdt.internal.ui.viewsupport.ProblemTreeViewer#isFiltered(java.lang.Object, java.lang.Object, org.eclipse.jface.viewers.ViewerFilter[])
  	 */
  	protected boolean isFiltered(Object object, Object parent, ViewerFilter[] filters) {
  		boolean res= super.isFiltered(object, parent, filters);
  		if (res && isEssential(object)) {
  			return false;
  		}
  		return res;
  	}
  
  	private boolean isEssential(Object object) {
  		try {
  			if (object instanceof IPackageFragment) {
  				IPackageFragment fragment = (IPackageFragment) object;
  				if (!fragment.isDefaultPackage() && fragment.hasSubpackages()) {
  					return hasFilteredChildren(fragment);
  				}
  			} else if (object instanceof LogicalPackage) {
  				LogicalPackage logicalPackage= (LogicalPackage) object;
  				if (!logicalPackage.isDefaultPackage() && logicalPackage.hasSubpackages()) {
  					return !hasFilteredChildren(object);
  				}
  			}
  		} catch (JavaScriptModelException e) {
  			JavaScriptPlugin.log(e);
  		}
  		return false;
  	}
  
  	// --------- see: IPackagesViewViewer ----------
  
  	public Widget doFindItem(Object element) {
  		return super.doFindItem(element);
  	}
  
  	public Widget doFindInputItem(Object element) {
  		return super.doFindInputItem(element);
  	}
  
  	public List getSelectionFromWidget() {
  		return super.getSelectionFromWidget();
  	}
  
  	public void doUpdateItem(Widget item, Object element, boolean fullMap){
  		super.doUpdateItem(item, element, fullMap);
  	}
  
  	public void internalRefresh(Object element){
  		super.internalRefresh(element);
  	}
  
  	public void setSelectionToWidget(List l, boolean reveal){
  		super.setSelectionToWidget(l, reveal);
  	}
  }
  