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 org.eclipse.core.runtime.CoreException;
  import org.eclipse.jface.text.ITextSelection;
  import org.eclipse.jface.text.TextSelection;
  import org.eclipse.jface.viewers.IStructuredSelection;
  import org.eclipse.ui.IWorkbenchSite;
  import org.eclipse.ui.PlatformUI;
  import org.eclipse.wst.jsdt.core.IFunction;
  import org.eclipse.wst.jsdt.core.ISourceRange;
  import org.eclipse.wst.jsdt.core.JavaScriptModelException;
  import org.eclipse.wst.jsdt.internal.corext.refactoring.RefactoringAvailabilityTester;
  import org.eclipse.wst.jsdt.internal.corext.refactoring.RefactoringExecutionStarter;
  import org.eclipse.wst.jsdt.internal.corext.util.JavaModelUtil;
  import org.eclipse.wst.jsdt.internal.ui.IJavaHelpContextIds;
  import org.eclipse.wst.jsdt.internal.ui.JavaScriptPlugin;
  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.JavaEditor;
  import org.eclipse.wst.jsdt.internal.ui.javaeditor.JavaTextSelection;
  import org.eclipse.wst.jsdt.internal.ui.refactoring.RefactoringMessages;
  import org.eclipse.wst.jsdt.internal.ui.util.ExceptionHandler;
  
  /**
   * Action that encapsulates the a constructor call with a factory
   * method.
   * <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 IntroduceFactoryAction extends SelectionDispatchAction {
  	
  	private JavaEditor fEditor;
  
  	/**
  	 * Note: This constructor is for internal use only. Clients should not call this constructor.
  	 * @param editor the JavaScript editor
  	 */
  	public IntroduceFactoryAction(JavaEditor editor) {
  		this(editor.getEditorSite());
  		fEditor= editor;
  		setEnabled(SelectionConverter.getInputAsCompilationUnit(fEditor) != null);
  	}
  
  	/**
  	 * Creates a new <code>IntroduceFactoryAction</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 IntroduceFactoryAction(IWorkbenchSite site) {
  		super(site);
  		setText(RefactoringMessages.IntroduceFactoryAction_label); 
  		setToolTipText(RefactoringMessages.IntroduceFactoryAction_tooltipText); 
  		setDescription(RefactoringMessages.IntroduceFactoryAction_description); 
  		PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.INTRODUCE_FACTORY_ACTION);
  	}
  	
  	//---- structured selection --------------------------------------------------
  	
  	/*
  	 * @see SelectionDispatchAction#selectionChanged(IStructuredSelection)
  	 */
  	public void selectionChanged(IStructuredSelection selection) {
  		try {
  			setEnabled(RefactoringAvailabilityTester.isIntroduceFactoryAvailable(selection));
  		} catch (JavaScriptModelException e) {
  			if (JavaModelUtil.isExceptionToBeLogged(e))
  				JavaScriptPlugin.log(e);
  			setEnabled(false);//no UI here - happens on selection changes
  		}
  	}
  
  	/*
  	 * @see SelectionDispatchAction#run(IStructuredSelection)
  	 */
  	public void run(IStructuredSelection selection) {
  		try {
  			// we have to call this here - no selection changed event is sent after a refactoring but it may still invalidate enablement
  			if (RefactoringAvailabilityTester.isIntroduceFactoryAvailable(selection)) {
  				IFunction method= (IFunction) selection.getFirstElement();
  				if (!ActionUtil.isEditable(getShell(), method))
  					return;
  				ISourceRange range= method.getNameRange();
  				RefactoringExecutionStarter.startIntroduceFactoryRefactoring(method.getJavaScriptUnit(), new TextSelection(range.getOffset(), range.getLength()), getShell());
  			}
  		} catch (CoreException e) {
  			ExceptionHandler.handle(e, RefactoringMessages.IntroduceFactoryAction_dialog_title, RefactoringMessages.IntroduceFactoryAction_exception); 
  		}
  	}
  
  	/* (non-Javadoc)
  	 * Method declared on SelectionDispatchAction
  	 */		
  	public void selectionChanged(ITextSelection selection) {
  		setEnabled(fEditor != null && SelectionConverter.getInputAsCompilationUnit(fEditor) != null);
  	}
  
  	/**
  	 * Note: This method is for internal use only. Clients should not call this method.
  	 */
  	public void selectionChanged(JavaTextSelection selection) {
  		try {
  			setEnabled(RefactoringAvailabilityTester.isIntroduceFactoryAvailable(selection));
  		} catch (JavaScriptModelException e) {
  			setEnabled(false);
  		}
  	}
  
  	public void run(ITextSelection selection) {
  		if (!ActionUtil.isEditable(fEditor))
  			return;
  		try {
  			RefactoringExecutionStarter.startIntroduceFactoryRefactoring(SelectionConverter.getInputAsCompilationUnit(fEditor), selection, getShell());
  		} catch (CoreException e) {
  			ExceptionHandler.handle(e, RefactoringMessages.IntroduceFactoryAction_dialog_title, RefactoringMessages.IntroduceFactoryAction_exception); 
  		}
  	}
  }
  