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
   *     Sebastian Davids - Fixed bug 25898
   *******************************************************************************/
  package org.eclipse.wst.jsdt.ui.actions;
  
  import java.lang.reflect.InvocationTargetException;
  
  import org.eclipse.core.runtime.CoreException;
  import org.eclipse.core.runtime.NullProgressMonitor;
  import org.eclipse.jface.dialogs.IDialogConstants;
  import org.eclipse.jface.dialogs.MessageDialog;
  import org.eclipse.jface.text.ITextSelection;
  import org.eclipse.ltk.core.refactoring.Change;
  import org.eclipse.ltk.core.refactoring.PerformChangeOperation;
  import org.eclipse.ltk.core.refactoring.RefactoringStatus;
  import org.eclipse.ltk.core.refactoring.RefactoringStatusEntry;
  import org.eclipse.ltk.ui.refactoring.RefactoringUI;
  import org.eclipse.swt.widgets.Button;
  import org.eclipse.swt.widgets.Composite;
  import org.eclipse.swt.widgets.Shell;
  import org.eclipse.ui.PlatformUI;
  import org.eclipse.wst.jsdt.core.IJavaScriptUnit;
  import org.eclipse.wst.jsdt.core.ISourceRange;
  import org.eclipse.wst.jsdt.internal.corext.refactoring.base.JavaStatusContext;
  import org.eclipse.wst.jsdt.internal.corext.refactoring.surround.ISurroundWithTryCatchQuery;
  import org.eclipse.wst.jsdt.internal.corext.refactoring.surround.SurroundWithTryCatchRefactoring;
  import org.eclipse.wst.jsdt.internal.ui.IJavaHelpContextIds;
  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.actions.WorkbenchRunnableAdapter;
  import org.eclipse.wst.jsdt.internal.ui.javaeditor.CompilationUnitEditor;
  import org.eclipse.wst.jsdt.internal.ui.refactoring.RefactoringMessages;
  import org.eclipse.wst.jsdt.internal.ui.util.BusyIndicatorRunnableContext;
  import org.eclipse.wst.jsdt.internal.ui.util.ElementValidator;
  import org.eclipse.wst.jsdt.internal.ui.util.ExceptionHandler;
  
  /**
   * Action to surround a set of statements with a try/catch block.
   * 
   * <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 SurroundWithTryCatchAction extends SelectionDispatchAction {
  
  	private CompilationUnitEditor fEditor;
  
  	private static class Query implements ISurroundWithTryCatchQuery {
  		private Shell fParent;
  		public Query(Shell shell) {
  			fParent= shell;
  		}
  		public boolean catchRuntimeException() {
  			MessageDialog dialog = new MessageDialog(
  				fParent, getDialogTitle(),  null,	// accept the default window icon
  				RefactoringMessages.SurroundWithTryCatchAction_no_exceptions, 
  				MessageDialog.QUESTION, 
  				new String[] {IDialogConstants.YES_LABEL, IDialogConstants.NO_LABEL}, 
  				1) {
  					// Work around for http://dev.eclipse.org/bugs/show_bug.cgi?id=18303
  					protected void createButtonsForButtonBar(Composite parent) {
  						super.createButtonsForButtonBar(parent);
  						Button button= getButton(1);
  						if (button != null)
  							button.setFocus();
  					}
  			};
  			return dialog.open() == 0; // yes selected
  		}
  	}
  
  	/**
  	 * Note: This constructor is for internal use only. Clients should not call this constructor.
  	 * @param editor the compilation unit editor
  	 */
  	public SurroundWithTryCatchAction(CompilationUnitEditor editor) {
  		super(editor.getEditorSite());
  		setText(RefactoringMessages.SurroundWithTryCatchAction_label); 
  		fEditor= editor;
  		setEnabled((fEditor != null && SelectionConverter.getInputAsCompilationUnit(fEditor) != null));
  		PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.SURROUND_WITH_TRY_CATCH_ACTION);
  	}
  
  	public void run(ITextSelection selection) {
  		if (!ActionUtil.isEditable(fEditor))
  			return;
  		IJavaScriptUnit cu= SelectionConverter.getInputAsCompilationUnit(fEditor);
  		if (cu == null || !ElementValidator.checkValidateEdit(cu, getShell(), getDialogTitle()))
  			return;
  		SurroundWithTryCatchRefactoring refactoring= SurroundWithTryCatchRefactoring.create(cu, selection, new Query(getShell()));
  		
  		if (refactoring == null)
  			return;
  		try {
  			RefactoringStatus status= refactoring.checkInitialConditions(new NullProgressMonitor());
  			if (status.hasFatalError()) {
  				RefactoringStatusEntry entry= status.getEntryMatchingSeverity(RefactoringStatus.FATAL);
  				MessageDialog.openInformation(getShell(), getDialogTitle(), entry.getMessage());
  				if (entry.getContext() instanceof JavaStatusContext && fEditor != null) {
  					JavaStatusContext context= (JavaStatusContext)entry.getContext();
  					ISourceRange range= context.getSourceRange();
  					fEditor.setHighlightRange(range.getOffset(), range.getLength(), true);
  				}
  				return;
  			}
  			if (refactoring.stopExecution())
  				return;
  			Change change= refactoring.createChange(new NullProgressMonitor());
  			change.initializeValidationData(new NullProgressMonitor());
  			PerformChangeOperation op= RefactoringUI.createUIAwareChangeOperation(change);
  			// must be fork == false since file buffers can't be manipulated in a different thread.
  			WorkbenchRunnableAdapter adapter= new WorkbenchRunnableAdapter(op);
  			PlatformUI.getWorkbench().getProgressService().runInUI(
  				new BusyIndicatorRunnableContext(), adapter, adapter.getSchedulingRule());
  		} catch (CoreException e) {
  			ExceptionHandler.handle(e, getDialogTitle(), RefactoringMessages.SurroundWithTryCatchAction_exception); 
  		} catch (InvocationTargetException e) {
  			ExceptionHandler.handle(e, getDialogTitle(), RefactoringMessages.SurroundWithTryCatchAction_exception); 
  		} catch (InterruptedException e) {
  			// not cancelable
  		}
  	}
  
  	public void selectionChanged(ITextSelection selection) {
  		setEnabled(selection.getLength() > 0 && (fEditor != null && SelectionConverter.getInputAsCompilationUnit(fEditor) != null));
  	}
  
  	private static String getDialogTitle() {
  		return RefactoringMessages.SurroundWithTryCatchAction_dialog_title; 
  	}
  }
  