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.Assert;
  import org.eclipse.core.runtime.CoreException;
  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.IJavaScriptUnit;
  import org.eclipse.wst.jsdt.core.IFunction;
  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 introduces an indirection for a certain method. This action may be invoked
   * on source or binary methods or method invocations with or without attached source.
   * 
   * <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 IntroduceIndirectionAction extends SelectionDispatchAction {
  
  	private JavaEditor fEditor;
  
  	/**
  	 * Note: This constructor is for internal use only. Clients should not call this constructor.
  	 * @param editor the compilation unit editor
  	 */
  	public IntroduceIndirectionAction(JavaEditor editor) {
  		this(editor.getEditorSite());
  		fEditor= editor;
  		setEnabled(true);
  	}
  
  	/**
  	 * Creates a new <code>IntroduceIndirectionAction</code>. 
  	 * 
  	 * @param site the site providing context information for this action
  	 */
  	public IntroduceIndirectionAction(IWorkbenchSite site) {
  		super(site);
  		setText(RefactoringMessages.IntroduceIndirectionAction_title);
  		setToolTipText(RefactoringMessages.IntroduceIndirectionAction_tooltip);
  		setDescription(RefactoringMessages.IntroduceIndirectionAction_description);
  		PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.INTRODUCE_INDIRECTION_ACTION);
  	}
  
  	//---- structured selection --------------------------------------------------
  
  	/*
  	 * @see SelectionDispatchAction#selectionChanged(IStructuredSelection)
  	 */
  	public void selectionChanged(IStructuredSelection selection) {
  		try {
  			setEnabled(RefactoringAvailabilityTester.isIntroduceIndirectionAvailable(selection));
  		} catch (JavaScriptModelException e) {
  			if (JavaModelUtil.isExceptionToBeLogged(e))
  				JavaScriptPlugin.log(e);
  		}
  	}
  
  	/*
  	 * @see SelectionDispatchAction#selectionChanged(ITextSelection)
  	 */
  	public void selectionChanged(ITextSelection selection) {
  		setEnabled(true);
  	}
  
  	/**
  	 * Note: This method is for internal use only. Clients should not call this method.
  	 */
  	public void selectionChanged(JavaTextSelection selection) {
  		try {
  			setEnabled(RefactoringAvailabilityTester.isIntroduceIndirectionAvailable(selection));
  		} catch (JavaScriptModelException e) {
  			setEnabled(false);
  		}
  	}
  
  	/*
  	 * @see SelectionDispatchAction#run(IStructuredSelection)
  	 */
  	public void run(IStructuredSelection selection) {
  		try {
  			Assert.isTrue(RefactoringAvailabilityTester.isIntroduceIndirectionAvailable(selection));
  			Object first= selection.getFirstElement();
  			Assert.isTrue(first instanceof IFunction);
  			run((IFunction) first);
  		} catch (CoreException e) {
  			ExceptionHandler.handle(e, RefactoringMessages.IntroduceIndirectionAction_dialog_title, RefactoringMessages.IntroduceIndirectionAction_unknown_exception);
  		}
  	}
  
  	/* (non-Javadoc)
  	 * Method declared on SelectionDispatchAction
  	 */
  	public void run(ITextSelection selection) {
  		try {
  			Object editorInput= SelectionConverter.getInput(fEditor);
  			if (editorInput instanceof IJavaScriptUnit)
  				run(selection.getOffset(), selection.getLength(), (IJavaScriptUnit) editorInput);
  			else if (editorInput instanceof IClassFile)
  				run(selection.getOffset(), selection.getLength(), (IClassFile) editorInput);
  		} catch (JavaScriptModelException e) {
  			ExceptionHandler.handle(e, getShell(), RefactoringMessages.IntroduceIndirectionAction_dialog_title, RefactoringMessages.IntroduceIndirectionAction_unknown_exception);
  		}
  	}
  
  	private void run(int offset, int length, IJavaScriptUnit unit) throws JavaScriptModelException {
  		if (!ActionUtil.isEditable(fEditor, getShell(), unit))
  			return;
  		RefactoringExecutionStarter.startIntroduceIndirectionRefactoring(unit, offset, length, getShell());
  	}
  
  	private void run(int offset, int length, IClassFile file) throws JavaScriptModelException {
  		if (!ActionUtil.isEditable(fEditor, getShell(), file))
  			return;
  		RefactoringExecutionStarter.startIntroduceIndirectionRefactoring(file, offset, length, getShell());
  	}
  
  	private void run(IFunction method) throws JavaScriptModelException {
  		if (!ActionUtil.isEditable(fEditor, getShell(), method))
  			return;
  		RefactoringExecutionStarter.startIntroduceIndirectionRefactoring(method, getShell());
  	}
  }
  