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.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.IJavaScriptUnit;
  import org.eclipse.wst.jsdt.core.ISourceRange;
  import org.eclipse.wst.jsdt.core.IType;
  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 to convert an anonymous inner class to a nested class.
   * 
   * <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 ConvertAnonymousToNestedAction extends SelectionDispatchAction {
  
  	private final JavaEditor fEditor;
  	
  	/**
  	 * Note: This constructor is for internal use only. Clients should not call this constructor.
  	 * @param editor the JavaScript editor
  	 */
  	public ConvertAnonymousToNestedAction(JavaEditor editor) {
  		super(editor.getEditorSite());
  		setText(RefactoringMessages.ConvertAnonymousToNestedAction_Convert_Anonymous); 
  		fEditor= editor;
  		setEnabled(SelectionConverter.getInputAsCompilationUnit(fEditor) != null);
  		PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.CONVERT_ANONYMOUS_TO_NESTED_ACTION);
  	}
  
  	/**
  	 * Creates a new <code>ConvertAnonymousToNestedAction</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 ConvertAnonymousToNestedAction(IWorkbenchSite site) {
  		super(site);
  		fEditor= null;
  		setText(RefactoringMessages.ConvertAnonymousToNestedAction_Convert_Anonymous); 
  		PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.CONVERT_ANONYMOUS_TO_NESTED_ACTION);
  	}
  	
  	//---- Structured selection -----------------------------------------------------
  	
  	/* (non-Javadoc)
  	 * Method declared on SelectionDispatchAction
  	 */
  	public void selectionChanged(IStructuredSelection selection) {
  		try {
  			setEnabled(RefactoringAvailabilityTester.isConvertAnonymousAvailable(selection));
  		} catch (JavaScriptModelException e) {
  			if (JavaModelUtil.isExceptionToBeLogged(e))
  				JavaScriptPlugin.log(e);
  			setEnabled(false);
  		}
  	}
  	
  	/* (non-Javadoc)
  	 * Method declared on SelectionDispatchAction
  	 */
  	public void run(IStructuredSelection selection) {
  		IType type= getElement(selection);
  		if (type == null)
  			return;
  		ISourceRange range;
  		try {
  			range= type.getNameRange();
  			run(type.getJavaScriptUnit(), range.getOffset(), range.getLength());
  		} catch (JavaScriptModelException e) {
  			ExceptionHandler.handle(e, RefactoringMessages.ConvertAnonymousToNestedAction_dialog_title, RefactoringMessages.NewTextRefactoringAction_exception); 
  		}
  	}
  
  	private IType getElement(IStructuredSelection selection) {
  		if (selection.size() != 1)
  			return null;
  		Object element= selection.getFirstElement();
  		if (!(element instanceof IType))
  			return null;
  		IType type= (IType)element;
  		try {
  			if (type.isAnonymous())
  				return type;
  		} catch (JavaScriptModelException e) {
  			// fall through
  		}
  		return null;
  	}
  	
  	//---- Text selection -----------------------------------------------------------
  	
  	/* (non-Javadoc)
  	 * Method declared on SelectionDispatchAction
  	 */		
  	public void run(ITextSelection selection) {
  		try{
  			run(SelectionConverter.getInputAsCompilationUnit(fEditor), selection.getOffset(), selection.getLength());
  		} catch (JavaScriptModelException e){
  			ExceptionHandler.handle(e, RefactoringMessages.ConvertAnonymousToNestedAction_dialog_title, RefactoringMessages.NewTextRefactoringAction_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.isConvertAnonymousAvailable(selection));
  		} catch (JavaScriptModelException e) {
  			setEnabled(false);
  		}
  	}
  
  	//---- helpers -------------------------------------------------------------------
  	
  	private void run(IJavaScriptUnit unit, int offset, int length) throws JavaScriptModelException {
  		if (!ActionUtil.isEditable(fEditor, getShell(), unit))
  			return;
  		RefactoringExecutionStarter.startConvertAnonymousRefactoring(unit, offset, length, getShell());
  	}
  }
  