content: /*******************************************************************************
   * Copyright (c) 2005, 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.model;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.eclipse.core.resources.IFolder;
  import org.eclipse.core.runtime.CoreException;
  import org.eclipse.ltk.core.refactoring.RefactoringDescriptorProxy;
  import org.eclipse.ltk.core.refactoring.history.RefactoringHistory;
  import org.eclipse.wst.jsdt.core.IJavaScriptUnit;
  import org.eclipse.wst.jsdt.core.IJavaScriptProject;
  import org.eclipse.wst.jsdt.ui.StandardJavaScriptElementContentProvider;
  
  /**
   * Content provider for Java models.
   * 
   * 
   */
  public final class JavaModelContentProvider extends StandardJavaScriptElementContentProvider {
  
  	/** The name of the settings folder */
  	private static final String NAME_SETTINGS_FOLDER= ".settings"; //$NON-NLS-1$
  
  	/**
  	 * Creates a new java model content provider.
  	 */
  	public JavaModelContentProvider() {
  		super(true);
  	}
  
  	/**
  	 * {@inheritDoc}
  	 */
  	public Object[] getChildren(final Object element) {
  		if (element instanceof IJavaScriptUnit)
  			return NO_CHILDREN;
  		else if (element instanceof RefactoringHistory)
  			return ((RefactoringHistory) element).getDescriptors();
  		else if (element instanceof IJavaScriptProject) {
  			final List elements= new ArrayList();
  			elements.add(((IJavaScriptProject) element).getProject().getFolder(NAME_SETTINGS_FOLDER));
  			final Object[] children= super.getChildren(element);
  			for (int index= 0; index < children.length; index++) {
  				if (!elements.contains(children[index]))
  					elements.add(children[index]);
  			}
  			return elements.toArray();
  		} else if (element instanceof IFolder) {
  			final IFolder folder= (IFolder) element;
  			try {
  				return folder.members();
  			} catch (CoreException exception) {
  				// Do nothing
  			}
  		}
  		return super.getChildren(element);
  	}
  
  	/**
  	 * {@inheritDoc}
  	 */
  	public boolean hasChildren(final Object element) {
  		if (element instanceof IJavaScriptUnit)
  			return false;
  		else if (element instanceof RefactoringHistory)
  			return true;
  		else if (element instanceof RefactoringDescriptorProxy)
  			return false;
  		else if (element instanceof IFolder)
  			return true;
  		return super.hasChildren(element);
  	}
  }
  