content: /*******************************************************************************
   * Copyright (c) 2000, 2009 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.ui.actions;
  
  import java.lang.reflect.InvocationTargetException;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  
  import org.eclipse.core.runtime.IStatus;
  import org.eclipse.core.runtime.Status;
  import org.eclipse.jface.dialogs.ErrorDialog;
  import org.eclipse.jface.text.ITextSelection;
  import org.eclipse.jface.viewers.IStructuredSelection;
  import org.eclipse.ui.IWorkbenchSite;
  import org.eclipse.ui.PlatformUI;
  import org.eclipse.wst.jsdt.core.IClassFile;
  import org.eclipse.wst.jsdt.core.IImportDeclaration;
  import org.eclipse.wst.jsdt.core.IJavaScriptElement;
  import org.eclipse.wst.jsdt.core.IJavaScriptUnit;
  import org.eclipse.wst.jsdt.core.IPackageFragment;
  import org.eclipse.wst.jsdt.core.IType;
  import org.eclipse.wst.jsdt.core.JavaScriptModelException;
  import org.eclipse.wst.jsdt.core.Signature;
  import org.eclipse.wst.jsdt.internal.corext.util.JavaModelUtil;
  import org.eclipse.wst.jsdt.internal.ui.IJavaHelpContextIds;
  import org.eclipse.wst.jsdt.internal.ui.IJavaStatusConstants;
  import org.eclipse.wst.jsdt.internal.ui.JavaScriptPlugin;
  import org.eclipse.wst.jsdt.internal.ui.actions.ActionMessages;
  import org.eclipse.wst.jsdt.internal.ui.actions.ActionUtil;
  import org.eclipse.wst.jsdt.internal.ui.actions.SelectionConverter;
  import org.eclipse.wst.jsdt.internal.ui.browsing.LogicalPackage;
  import org.eclipse.wst.jsdt.internal.ui.javaeditor.JavaEditor;
  import org.eclipse.wst.jsdt.internal.ui.util.ExceptionHandler;
  import org.eclipse.wst.jsdt.internal.ui.util.OpenTypeHierarchyUtil;
  
  /**
   * This action opens a type hierarchy on the selected type.
   * <p>
   * The action is applicable to selections containing elements of type
   * <code>IType</code>.
   * 
   * <p>
   * This class may be instantiated; it is not intended to be subclassed.
   * </p>
   * 
   *
   * Provisional API: This class/interface is part of an interim API that is still under development and expected to
   * change significantly before reaching stability. It is being made available at this early stage to solicit feedback
   * from pioneering adopters on the understanding that any code that uses this API will almost certainly be broken
   * (repeatedly) as the API evolves.
   */
  public class OpenTypeHierarchyAction extends SelectionDispatchAction {
  	
  	private JavaEditor fEditor;
  	
  	/**
  	 * Creates a new <code>OpenTypeHierarchyAction</code>. The action requires
  	 * that the selection provided by the site's selection provider is of type <code>
  	 * org.eclipse.jface.viewers.IStructuredSelection</code>.
  	 * 
  	 * @param site the site providing context information for this action
  	 */
  	public OpenTypeHierarchyAction(IWorkbenchSite site) {
  		super(site);
  		setText(ActionMessages.OpenTypeHierarchyAction_label); 
  		setToolTipText(ActionMessages.OpenTypeHierarchyAction_tooltip); 
  		setDescription(ActionMessages.OpenTypeHierarchyAction_description); 
  		PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.OPEN_TYPE_HIERARCHY_ACTION);
  	}
  	
  	/**
  	 * Note: This constructor is for internal use only. Clients should not call this constructor.
  	 * @param editor the JavaScript editor
  	 */
  	public OpenTypeHierarchyAction(JavaEditor editor) {
  		this(editor.getEditorSite());
  		fEditor= editor;
  		setEnabled(SelectionConverter.canOperateOn(fEditor));
  	}
  	
  	/* (non-Javadoc)
  	 * Method declared on SelectionDispatchAction.
  	 */
  	public void selectionChanged(ITextSelection selection) {
  	}
  
  	/* (non-Javadoc)
  	 * Method declared on SelectionDispatchAction.
  	 */
  	public void selectionChanged(IStructuredSelection selection) {
  		setEnabled(isEnabled(selection));
  	}
  	
  	private boolean isEnabled(IStructuredSelection selection) {
  		if (selection.size() != 1)
  			return false;
  		Object input= selection.getFirstElement();
  		
  		
  		if (input instanceof LogicalPackage)
  			return true;
  		
  		if (!(input instanceof IJavaScriptElement))
  			return false;
  		switch (((IJavaScriptElement)input).getElementType()) {
  			case IJavaScriptElement.INITIALIZER:
  			case IJavaScriptElement.METHOD:
  			case IJavaScriptElement.FIELD:
  			case IJavaScriptElement.TYPE:
  				return true;
  			case IJavaScriptElement.PACKAGE_FRAGMENT_ROOT:
  			case IJavaScriptElement.JAVASCRIPT_PROJECT:
  			case IJavaScriptElement.PACKAGE_FRAGMENT:
  			case IJavaScriptElement.IMPORT_DECLARATION:	
  			case IJavaScriptElement.CLASS_FILE:
  			case IJavaScriptElement.JAVASCRIPT_UNIT:
  				return true;
  			case IJavaScriptElement.LOCAL_VARIABLE:
  			default:
  				return false;
  		}
  	}
  	
  	/* (non-Javadoc)
  	 * Method declared on SelectionDispatchAction.
  	 */
  	public void run(ITextSelection selection) {
  		IJavaScriptElement input= SelectionConverter.getInput(fEditor);
  		if (!ActionUtil.isProcessable(getShell(), input))
  			return;		
  		
  		try {
  			IJavaScriptElement[] elements= SelectionConverter.codeResolveOrInputForked(fEditor);
  			if (elements == null)
  				return;
  			List candidates= new ArrayList(elements.length);
  			for (int i= 0; i < elements.length; i++) {
  				IJavaScriptElement[] resolvedElements= OpenTypeHierarchyUtil.getCandidates(elements[i]);
  				if (resolvedElements != null)	
  					candidates.addAll(Arrays.asList(resolvedElements));
  			}
  			run((IJavaScriptElement[])candidates.toArray(new IJavaScriptElement[candidates.size()]));
  		} catch (InvocationTargetException e) {
  			ExceptionHandler.handle(e, getShell(), getDialogTitle(), ActionMessages.SelectionConverter_codeResolve_failed);
  		} catch (InterruptedException e) {
  			// cancelled
  		}
  	}
  	
  	/* (non-Javadoc)
  	 * Method declared on SelectionDispatchAction.
  	 */
  	public void run(IStructuredSelection selection) {
  		if (selection.size() != 1)
  			return;
  		Object input= selection.getFirstElement();
  		
  		if (input instanceof LogicalPackage) {
  			IPackageFragment[] fragments= ((LogicalPackage)input).getFragments();
  			if (fragments.length == 0)
  				return;
  			input= fragments[0];
  		}
  
  		if (!(input instanceof IJavaScriptElement)) {
  			IStatus status= createStatus(ActionMessages.OpenTypeHierarchyAction_messages_no_java_element); 
  			ErrorDialog.openError(getShell(), getDialogTitle(), ActionMessages.OpenTypeHierarchyAction_messages_title, status); 
  			return;
  		}
  		IJavaScriptElement element= (IJavaScriptElement) input;
  		if (!ActionUtil.isProcessable(getShell(), element))
  			return;
  
  		List result= new ArrayList(1);
  		IStatus status= compileCandidates(result, element);
  		if (status.isOK()) {
  			run((IJavaScriptElement[]) result.toArray(new IJavaScriptElement[result.size()]));
  		} else {
  			ErrorDialog.openError(getShell(), getDialogTitle(), ActionMessages.OpenTypeHierarchyAction_messages_title, status); 
  		}
  	}
  
  	/*
  	 * No Javadoc since the method isn't meant to be public but is
  	 * since the beginning
  	 */
  	public void run(IJavaScriptElement[] elements) {
  		if (elements.length == 0) {
  			getShell().getDisplay().beep();
  			return;
  		}
  		OpenTypeHierarchyUtil.open(elements, getSite().getWorkbenchWindow());
  	}
  	
  	private static String getDialogTitle() {
  		return ActionMessages.OpenTypeHierarchyAction_dialog_title; 
  	}
  	
  	private static IStatus compileCandidates(List result, IJavaScriptElement elem) {
  		IStatus ok= new Status(IStatus.OK, JavaScriptPlugin.getPluginId(), 0, "", null); //$NON-NLS-1$		
  		try {
  			switch (elem.getElementType()) {
  				case IJavaScriptElement.INITIALIZER:
  				case IJavaScriptElement.METHOD:
  				case IJavaScriptElement.FIELD:
  				case IJavaScriptElement.TYPE:
  				case IJavaScriptElement.PACKAGE_FRAGMENT_ROOT:
  				case IJavaScriptElement.JAVASCRIPT_PROJECT:
  					result.add(elem);
  					return ok;
  				case IJavaScriptElement.PACKAGE_FRAGMENT:
  					if (((IPackageFragment)elem).containsJavaResources()) {
  						result.add(elem);
  						return ok;
  					}
  					return createStatus(ActionMessages.OpenTypeHierarchyAction_messages_no_java_resources); 
  				case IJavaScriptElement.IMPORT_DECLARATION:	
  					IImportDeclaration decl= (IImportDeclaration) elem;
  					if (decl.isOnDemand()) {
  						elem= JavaModelUtil.findTypeContainer(elem.getJavaScriptProject(), Signature.getQualifier(elem.getElementName()));
  					} else {
  						elem= elem.getJavaScriptProject().findType(elem.getElementName());
  					}
  					if (elem != null) {
  						result.add(elem);
  						return ok;
  					}
  					return createStatus(ActionMessages.OpenTypeHierarchyAction_messages_unknown_import_decl);
  				case IJavaScriptElement.CLASS_FILE:
  					result.add(((IClassFile)elem).getType());
  					return ok;				
  				case IJavaScriptElement.JAVASCRIPT_UNIT:
  					IJavaScriptUnit cu= (IJavaScriptUnit)elem;
  					IType[] types= cu.getTypes();
  					if (types.length > 0) {
  						result.addAll(Arrays.asList(types));
  						return ok;
  					}
  					return createStatus(ActionMessages.OpenTypeHierarchyAction_messages_no_types); 
  			}
  		} catch (JavaScriptModelException e) {
  			return e.getStatus();
  		}
  		return createStatus(ActionMessages.OpenTypeHierarchyAction_messages_no_valid_java_element); 
  	}
  	
  	private static IStatus createStatus(String message) {
  		return new Status(IStatus.INFO, JavaScriptPlugin.getPluginId(), IJavaStatusConstants.INTERNAL_ERROR, message, null);
  	}			
  }
  