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.ui.actions;
  
  import java.lang.reflect.InvocationTargetException;
  import java.util.Iterator;
  
  import org.eclipse.core.resources.IFile;
  import org.eclipse.core.runtime.CoreException;
  import org.eclipse.core.runtime.IStatus;
  import org.eclipse.core.runtime.MultiStatus;
  import org.eclipse.core.runtime.Status;
  import org.eclipse.jface.dialogs.ErrorDialog;
  import org.eclipse.jface.text.ITextSelection;
  import org.eclipse.jface.util.OpenStrategy;
  import org.eclipse.jface.viewers.IStructuredSelection;
  import org.eclipse.ui.IEditorPart;
  import org.eclipse.ui.IWorkbenchSite;
  import org.eclipse.ui.PartInitException;
  import org.eclipse.ui.PlatformUI;
  import org.eclipse.ui.texteditor.IEditorStatusLine;
  import org.eclipse.wst.jsdt.core.IJavaScriptUnit;
  import org.eclipse.wst.jsdt.core.IJavaScriptElement;
  import org.eclipse.wst.jsdt.core.ISourceReference;
  import org.eclipse.wst.jsdt.core.JavaScriptModelException;
  import org.eclipse.wst.jsdt.internal.corext.util.JavaModelUtil;
  import org.eclipse.wst.jsdt.internal.corext.util.Messages;
  import org.eclipse.wst.jsdt.internal.ui.IJavaHelpContextIds;
  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.javaeditor.EditorUtility;
  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.viewsupport.JavaUILabelProvider;
  import org.eclipse.wst.jsdt.ui.JavaScriptUI;
  
  /**
   * This action opens a JavaScript editor on a JavaScript element or file.
   * <p>
   * The action is applicable to selections containing elements of
   * type <code>IJavaScriptUnit</code>, <code>IMember</code>
   * or <code>IFile</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 OpenAction extends SelectionDispatchAction {
  	
  	private JavaEditor fEditor;
  	
  	/**
  	 * Creates a new <code>OpenAction</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 OpenAction(IWorkbenchSite site) {
  		super(site);
  		setText(ActionMessages.OpenAction_label); 
  		setToolTipText(ActionMessages.OpenAction_tooltip); 
  		setDescription(ActionMessages.OpenAction_description); 
  		PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.OPEN_ACTION);
  	}
  	
  	/**
  	 * Note: This constructor is for internal use only. Clients should not call this constructor.
  	 * @param editor the JavaScript editor
  	 */
  	public OpenAction(JavaEditor editor) {
  		this(editor.getEditorSite());
  		fEditor= editor;
  		setText(ActionMessages.OpenAction_declaration_label); 
  		setEnabled(EditorUtility.getEditorInputJavaElement(fEditor, false) != null);
  	}
  	
  	/* (non-Javadoc)
  	 * Method declared on SelectionDispatchAction.
  	 */
  	public void selectionChanged(ITextSelection selection) {
  	}
  
  	/* (non-Javadoc)
  	 * Method declared on SelectionDispatchAction.
  	 */
  	public void selectionChanged(IStructuredSelection selection) {
  		setEnabled(checkEnabled(selection));
  	}
  	
  	private boolean checkEnabled(IStructuredSelection selection) {
  		if (selection.isEmpty())
  			return false;
  		for (Iterator iter= selection.iterator(); iter.hasNext();) {
  			Object element= iter.next();
  			if (element instanceof ISourceReference)
  				continue;
  			if (element instanceof IFile)
  				continue;
  			if (JavaModelUtil.isOpenableStorage(element))
  				continue;
  			return false;
  		}
  		return true;
  	}
  	
  	/* (non-Javadoc)
  	 * Method declared on SelectionDispatchAction.
  	 */
  	public void run(ITextSelection selection) {
  		if (!isProcessable())
  			return;
  		try {
  			IJavaScriptElement[] elements= SelectionConverter.codeResolveForked(fEditor, false);
  			if (elements == null || elements.length == 0) {
  				IEditorStatusLine statusLine= (IEditorStatusLine) fEditor.getAdapter(IEditorStatusLine.class);
  				if (statusLine != null)
  					statusLine.setMessage(true, ActionMessages.OpenAction_error_messageBadSelection, null); 
  				getShell().getDisplay().beep();
  				return;
  			}
  			IJavaScriptElement element= elements[0];
  			if (elements.length > 1) {
  				element= SelectionConverter.selectJavaElement(elements, getShell(), getDialogTitle(), ActionMessages.OpenAction_select_element);
  				if (element == null)
  					return;
  			}   
  
  			if (element!=null)
  			{
  				int type= element.getElementType();
  				if (type == IJavaScriptElement.JAVASCRIPT_PROJECT || type == IJavaScriptElement.PACKAGE_FRAGMENT_ROOT || type == IJavaScriptElement.PACKAGE_FRAGMENT)
  					element= EditorUtility.getEditorInputJavaElement(fEditor, false);
  				run(new Object[] {element} );
  			}
  		} catch (InvocationTargetException e) {
  			ExceptionHandler.handle(e, getShell(), getDialogTitle(), ActionMessages.OpenAction_error_message); 
  		} catch (InterruptedException e) {
  			// ignore
  		}
  	}
  
  	private boolean isProcessable() {
  		if (fEditor != null) {
  			IJavaScriptElement je= EditorUtility.getEditorInputJavaElement(fEditor, false);
  			if (je instanceof IJavaScriptUnit && !JavaModelUtil.isPrimary((IJavaScriptUnit)je))
  				return true; // can process non-primary working copies
  		}
  		return ActionUtil.isProcessable(fEditor);
  	}
  	
  	/* (non-Javadoc)
  	 * Method declared on SelectionDispatchAction.
  	 */
  	public void run(IStructuredSelection selection) {
  		if (!checkEnabled(selection))
  			return;
  		run(selection.toArray());
  	}
  	
  	/**
  	 * Note: this method is for internal use only. Clients should not call this method.
  	 * 
  	 * @param elements the elements to process
  	 */
  	public void run(Object[] elements) {
  		if (elements == null)
  			return;
  		
  		MultiStatus status= new MultiStatus(JavaScriptUI.ID_PLUGIN, IStatus.OK, ActionMessages.OpenAction_multistatus_message, null);
  		
  		for (int i= 0; i < elements.length; i++) {
  			Object element= elements[i];
  			try {
  				element= getElementToOpen(element);
  				boolean activateOnOpen= fEditor != null ? true : OpenStrategy.activateOnOpen();
  				IEditorPart part= EditorUtility.openInEditor(element, activateOnOpen);
  				if (part != null && element instanceof IJavaScriptElement)
  					JavaScriptUI.revealInEditor(part, (IJavaScriptElement)element);
  			} catch (PartInitException e) {
  				String message= Messages.format(ActionMessages.OpenAction_error_problem_opening_editor, new String[] { new JavaUILabelProvider().getText(element), e.getStatus().getMessage() });
  				status.add(new Status(IStatus.ERROR, JavaScriptUI.ID_PLUGIN, IStatus.ERROR, message, null));
  			} catch (CoreException e) {
  				String message= Messages.format(ActionMessages.OpenAction_error_problem_opening_editor, new String[] { new JavaUILabelProvider().getText(element), e.getStatus().getMessage() });
  				status.add(new Status(IStatus.ERROR, JavaScriptUI.ID_PLUGIN, IStatus.ERROR, message, null));
  				JavaScriptPlugin.log(e);
  			}
  		}
  		if (!status.isOK()) {
  			IStatus[] children= status.getChildren();
  			ErrorDialog.openError(getShell(), getDialogTitle(), ActionMessages.OpenAction_error_message, children.length == 1 ? children[0] : status);
  		}
  	}
  	
  	/**
  	 * Note: this method is for internal use only. Clients should not call this method.
  	 * 
  	 * @param object the element to open
  	 * @return the real element to open
  	 * @throws JavaScriptModelException if an error occurs while accessing the JavaScript model
  	 */
  	public Object getElementToOpen(Object object) throws JavaScriptModelException {
  		return object;
  	}	
  	
  	private String getDialogTitle() {
  		return ActionMessages.OpenAction_error_title; 
  	}
  }
  