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.internal.ui.refactoring.actions;
  
  import org.eclipse.core.runtime.Assert;
  import org.eclipse.jface.dialogs.MessageDialog;
  import org.eclipse.jface.text.ITextSelection;
  import org.eclipse.jface.viewers.IStructuredSelection;
  import org.eclipse.swt.widgets.Shell;
  import org.eclipse.ui.IWorkbenchSite;
  import org.eclipse.ui.PlatformUI;
  import org.eclipse.wst.jsdt.core.IJavaScriptUnit;
  import org.eclipse.wst.jsdt.core.IField;
  import org.eclipse.wst.jsdt.core.JavaScriptModelException;
  import org.eclipse.wst.jsdt.core.dom.JavaScriptUnit;
  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.refactoring.util.RefactoringASTParser;
  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;
  import org.eclipse.wst.jsdt.ui.actions.SelectionDispatchAction;
  
  /**
   * Inlines a constant.
   * 
   * <p>
   * This class may be instantiated; it is not intended to be subclassed.
   * </p>
   * 
   */
  public class InlineConstantAction extends SelectionDispatchAction {
  
  	private JavaEditor fEditor;
  	
  	/**
  	 * Note: This constructor is for internal use only. Clients should not call this constructor.
  	 * 
  	 * @param editor the java editor
  	 */
  	public InlineConstantAction(JavaEditor editor) {
  		this(editor.getEditorSite());
  		fEditor= editor;
  		setEnabled(SelectionConverter.canOperateOn(fEditor));
  	}
  
  	public InlineConstantAction(IWorkbenchSite site) {
  		super(site);
  		setText(RefactoringMessages.InlineConstantAction_inline_Constant); 
  		PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.INLINE_ACTION);		
  	}
  	
  	//---- structured selection ---------------------------------------------
  
  	/*
  	 * @see SelectionDispatchAction#selectionChanged(IStructuredSelection)
  	 */
  	public void selectionChanged(IStructuredSelection selection) {
  		try {
  			setEnabled(RefactoringAvailabilityTester.isInlineConstantAvailable(selection));
  		} catch (JavaScriptModelException e) {
  			// http://bugs.eclipse.org/bugs/show_bug.cgi?id=19253
  			if (JavaModelUtil.isExceptionToBeLogged(e))
  				JavaScriptPlugin.log(e);
  			setEnabled(false);//no ui
  		}
  	}
  
  	/*
  	 * @see SelectionDispatchAction#run(IStructuredSelection)
  	 */
  	public void run(IStructuredSelection selection) {		
  		try {
  			Assert.isTrue(RefactoringAvailabilityTester.isInlineConstantAvailable(selection));
  			
  			Object first= selection.getFirstElement();
  			Assert.isTrue(first instanceof IField);
  			
  			IField field= (IField) first;
  			run(field.getNameRange().getOffset(), field.getNameRange().getLength(), field.getJavaScriptUnit());
  		} catch (JavaScriptModelException e) {
  			ExceptionHandler.handle(e, getShell(), RefactoringMessages.InlineConstantAction_dialog_title, RefactoringMessages.InlineConstantAction_unexpected_exception);	 
  		}
  	}	
  
  	//---- text selection -----------------------------------------------
  	
      /*
       * @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.
  	 * @param selection 
  	 */
  	public void selectionChanged(JavaTextSelection selection) {
  		try {
  			setEnabled(RefactoringAvailabilityTester.isInlineConstantAvailable(selection));
  		} catch (JavaScriptModelException e) {
  			setEnabled(false);
  		}
  	}
  	
  	/* (non-Javadoc)
  	 * Method declared on SelectionDispatchAction
  	 */		
  	public void run(ITextSelection selection) {
  		run(selection.getOffset(), selection.getLength(), SelectionConverter.getInputAsCompilationUnit(fEditor));
  	}
  
  	private void run(int offset, int length, IJavaScriptUnit cu) {
  		Assert.isNotNull(cu);
  		Assert.isTrue(offset >= 0);
  		Assert.isTrue(length >= 0);
  		if (!ActionUtil.isEditable(fEditor, getShell(), cu))
  			return;
  		try {
  			JavaScriptUnit node= RefactoringASTParser.parseWithASTProvider(cu, true, null);
  			if (! RefactoringExecutionStarter.startInlineConstantRefactoring(cu, node, offset, length, getShell())) {
  				MessageDialog.openInformation(getShell(), RefactoringMessages.InlineConstantAction_dialog_title, RefactoringMessages.InlineConstantAction_no_constant_reference_or_declaration);
  			}
  			
  		} catch (JavaScriptModelException e) {
  			ExceptionHandler.handle(e, getShell(), RefactoringMessages.InlineConstantAction_dialog_title, RefactoringMessages.InlineConstantAction_unexpected_exception); 
  		}
  	}
  
  	public boolean tryInlineConstant(IJavaScriptUnit unit, JavaScriptUnit node, ITextSelection selection, Shell shell) {
  		try {
  			if (RefactoringExecutionStarter.startInlineConstantRefactoring(unit, node, selection.getOffset(), selection.getLength(), shell)) {
  				return true;
  			}
  		} catch (JavaScriptModelException e) {
  			ExceptionHandler.handle(e, getShell(), RefactoringMessages.InlineConstantAction_dialog_title, RefactoringMessages.InlineConstantAction_unexpected_exception); 
  		}
  		return false;
  	}
  }
  