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;
  
  import org.eclipse.core.resources.IFile;
  import org.eclipse.core.resources.IProject;
  import org.eclipse.core.resources.IResource;
  import org.eclipse.core.resources.mapping.ResourceMapping;
  import org.eclipse.core.runtime.IAdaptable;
  import org.eclipse.core.runtime.IAdapterFactory;
  import org.eclipse.search.ui.ISearchPageScoreComputer;
  import org.eclipse.team.ui.history.IHistoryPageSource;
  import org.eclipse.ui.IContainmentAdapter;
  import org.eclipse.ui.IContributorResourceAdapter;
  import org.eclipse.ui.IPersistableElement;
  import org.eclipse.ui.ide.IContributorResourceAdapter2;
  import org.eclipse.ui.model.IWorkbenchAdapter;
  import org.eclipse.ui.views.properties.FilePropertySource;
  import org.eclipse.ui.views.properties.IPropertySource;
  import org.eclipse.ui.views.properties.ResourcePropertySource;
  import org.eclipse.ui.views.tasklist.ITaskListResourceAdapter;
  import org.eclipse.wst.jsdt.core.IJavaScriptUnit;
  import org.eclipse.wst.jsdt.core.IJavaScriptElement;
  import org.eclipse.wst.jsdt.core.IPackageFragmentRoot;
  import org.eclipse.wst.jsdt.internal.corext.util.JavaElementResourceMapping;
  import org.eclipse.wst.jsdt.internal.ui.compare.JavaElementHistoryPageSource;
  import org.eclipse.wst.jsdt.internal.ui.javaeditor.IClassFileEditorInput;
  import org.eclipse.wst.jsdt.internal.ui.search.JavaSearchPageScoreComputer;
  import org.eclipse.wst.jsdt.internal.ui.search.SearchUtil;
  
  /**
   * Implements basic UI support for Java elements.
   * Implements handle to persistent support for Java elements.
   */
  public class JavaElementAdapterFactory implements IAdapterFactory, IContributorResourceAdapter, IContributorResourceAdapter2 {
  	
  	private static Class[] PROPERTIES= new Class[] {
  		IPropertySource.class,
  		IResource.class,
  		IWorkbenchAdapter.class,
  		IResourceLocator.class,
  		IPersistableElement.class,
  		IContributorResourceAdapter.class,
  		IContributorResourceAdapter2.class,
  		ITaskListResourceAdapter.class,
  		IContainmentAdapter.class,
  		IHistoryPageSource.class
  	};
  	
  	/*
  	 * Do not use real type since this would cause
  	 * the Search plug-in to be loaded.
  	 */
  	private Object fSearchPageScoreComputer;
  	private static IResourceLocator fgResourceLocator;
  	private static JavaWorkbenchAdapter fgJavaWorkbenchAdapter;
  	private static ITaskListResourceAdapter fgTaskListAdapter;
  	private static JavaElementContainmentAdapter fgJavaElementContainmentAdapter;
  	
  	public Class[] getAdapterList() {
  		updateLazyLoadedAdapters();
  		return PROPERTIES;
  	}
  	
  	public Object getAdapter(Object element, Class key) {
  		updateLazyLoadedAdapters();
  		IJavaScriptElement java= getJavaElement(element);
  		
  		if (IPropertySource.class.equals(key)) {
  			return getProperties(java);
  		} if (IResource.class.equals(key)) {
  			return getResource(java);
  		} if (fSearchPageScoreComputer != null && ISearchPageScoreComputer.class.equals(key)) {
  			return fSearchPageScoreComputer;
  		} if (IWorkbenchAdapter.class.equals(key)) {
  			return getJavaWorkbenchAdapter();
  		} if (IResourceLocator.class.equals(key)) {
  			return getResourceLocator();
  		} if (IPersistableElement.class.equals(key)) {
  			return new PersistableJavaElementFactory(java);
  		} if (IContributorResourceAdapter.class.equals(key)) {
  			if (getResource(java)!=null)
  			return this;
  		} if (IContributorResourceAdapter2.class.equals(key)) {
  			return this;
  		} if (ITaskListResourceAdapter.class.equals(key)) {
  			return getTaskListAdapter();
  		} if (IContainmentAdapter.class.equals(key)) {
  			return getJavaElementContainmentAdapter();
  		} if (IHistoryPageSource.class.equals(key) && JavaElementHistoryPageSource.hasEdition(java)) {
  			return JavaElementHistoryPageSource.getInstance();
  		}
  		return null; 
  	}
  	
  	private IResource getResource(IJavaScriptElement element) {
  		// can't use IJavaScriptElement.getResource directly as we are interested in the
  		// corresponding resource
  		switch (element.getElementType()) {
  			case IJavaScriptElement.TYPE:
  				// top level types behave like the CU
  				IJavaScriptElement parent= element.getParent();
  				if (parent instanceof IJavaScriptUnit) {
  					return ((IJavaScriptUnit) parent).getPrimary().getResource();
  				}
  				return null;
  			case IJavaScriptElement.JAVASCRIPT_UNIT:
  				return ((IJavaScriptUnit) element).getPrimary().getResource();
  			case IJavaScriptElement.CLASS_FILE:
  			case IJavaScriptElement.PACKAGE_FRAGMENT:
  				// test if in a archive
  				IPackageFragmentRoot root= (IPackageFragmentRoot) element.getAncestor(IJavaScriptElement.PACKAGE_FRAGMENT_ROOT);
  				if (!root.isArchive()) {
  					return element.getResource();
  				}
  				return null;
  			case IJavaScriptElement.PACKAGE_FRAGMENT_ROOT:
  			case IJavaScriptElement.JAVASCRIPT_PROJECT:
  			case IJavaScriptElement.JAVASCRIPT_MODEL:
  				return element.getResource();
  			default:
  				return null;
  		}		
      }
  
      public IResource getAdaptedResource(IAdaptable adaptable) {
      	IJavaScriptElement je= getJavaElement(adaptable);
      	if (je != null)
      		return getResource(je);
  
      	return null;
      }
      
      public ResourceMapping getAdaptedResourceMapping(IAdaptable adaptable) {
      	IJavaScriptElement je= getJavaElement(adaptable);
      	if (je != null)
      		return JavaElementResourceMapping.create(je);
  
      	return null;
      }
      
  	private IJavaScriptElement getJavaElement(Object element) {
  		if (element instanceof IJavaScriptElement)
  			return (IJavaScriptElement)element;
  		if (element instanceof IClassFileEditorInput)
  			return ((IClassFileEditorInput)element).getClassFile().getPrimaryElement();
  
  		return null;
  	}
  	
  	private IPropertySource getProperties(IJavaScriptElement element) {
  		IResource resource= getResource(element);
  		if (resource == null)
  			return new JavaElementProperties(element);
  		if (resource.getType() == IResource.FILE)
  			return new FilePropertySource((IFile) resource);
  		return new ResourcePropertySource(resource);
  	}
  
  	private void updateLazyLoadedAdapters() {
  		if (fSearchPageScoreComputer == null && SearchUtil.isSearchPlugInActivated())
  			createSearchPageScoreComputer();
  	}
  
  	private void createSearchPageScoreComputer() {
  		fSearchPageScoreComputer= new JavaSearchPageScoreComputer();
  		PROPERTIES= new Class[] {
  			IPropertySource.class,
  			IResource.class,
  			ISearchPageScoreComputer.class,
  			IWorkbenchAdapter.class,
  			IResourceLocator.class,
  			IPersistableElement.class,
  			IProject.class,
  			IContributorResourceAdapter.class,
  			IContributorResourceAdapter2.class,
  			ITaskListResourceAdapter.class,
  			IContainmentAdapter.class
  		};
  	}
  
  	private static IResourceLocator getResourceLocator() {
  		if (fgResourceLocator == null)
  			fgResourceLocator= new ResourceLocator();
  		return fgResourceLocator;
  	}
  	
  	private static JavaWorkbenchAdapter getJavaWorkbenchAdapter() {
  		if (fgJavaWorkbenchAdapter == null) 
  			fgJavaWorkbenchAdapter= new JavaWorkbenchAdapter();
  		return fgJavaWorkbenchAdapter;
  	}
  
  	private static ITaskListResourceAdapter getTaskListAdapter() {
  		if (fgTaskListAdapter == null)
  			fgTaskListAdapter= new JavaTaskListAdapter();
  		return fgTaskListAdapter;
  	}
  
  	private static JavaElementContainmentAdapter getJavaElementContainmentAdapter() {
  		if (fgJavaElementContainmentAdapter == null)
  			fgJavaElementContainmentAdapter= new JavaElementContainmentAdapter();
  		return fgJavaElementContainmentAdapter;
  	}
  }
  