content: /*******************************************************************************
   * Copyright (c) 2006, 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.actions;
  
  import java.io.CharConversionException;
  import java.util.Arrays;
  import java.util.HashSet;
  import java.util.Iterator;
  import java.util.Set;
  
  import org.eclipse.jface.dialogs.MessageDialog;
  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.IJavaScriptElement;
  import org.eclipse.wst.jsdt.core.IMember;
  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.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;
  
  /**
   * Action to extract a supertype from a class.
   * <p>
   * Action is applicable to selections containing elements of type
   * <code>IType</code> (top-level types only), <code>IField</code> and
   * <code>IFunction</code>.
   * </p>
   * <p>
   * This class may be instantiated; it is not intended to be subclassed.
   * </p>
   * 
   * 
   */
  public class ExtractSuperClassAction extends SelectionDispatchAction {
  
  	/**
  	 * Action definition ID of the refactor -> extract supertype action (value
  	 * <code>"org.eclipse.wst.jsdt.ui.edit.text.java.extract.superclass"</code>).
  	 * 
  	 * 
  	 */
  	public static final String EXTRACT_SUPERTYPE= "org.eclipse.wst.jsdt.ui.edit.text.java.extract.superclass"; //$NON-NLS-1$
  
  	/**
  	 * Refactor menu: name of standard Extract Supertype global action (value
  	 * <code>"org.eclipse.wst.jsdt.ui.actions.ExtractSuperclass"</code>).
  	 * 
  	 * 
  	 */
  	public static final String EXTRACT_SUPERTYPES= "org.eclipse.wst.jsdt.ui.actions.ExtractSuperclass"; //$NON-NLS-1$
  
  	private static IMember[] getSelectedMembers(final IStructuredSelection selection) {
  		if (selection.isEmpty())
  			return null;
  		if (selection.size() == 1) {
  			try {
  				final IType type= RefactoringAvailabilityTester.getSingleSelectedType(selection);
  				if (type != null)
  					return new IType[] {type};
  			} catch (JavaScriptModelException exception) {
  				JavaScriptPlugin.log(exception);
  			}
  		}
  		for (final Iterator iterator= selection.iterator(); iterator.hasNext();) {
  			if (!(iterator.next() instanceof IMember))
  				return null;
  		}
  		final Set set= new HashSet();
  		set.addAll(Arrays.asList(selection.toArray()));
  		return (IMember[]) set.toArray(new IMember[set.size()]);
  	}
  
  	/** The java editor */
  	private JavaEditor fEditor;
  
  	/**
  	 * Note: This constructor is for internal use only. Clients should not call
  	 * this constructor.
  	 * 
  	 * @param editor
  	 *            the java editor
  	 */
  	public ExtractSuperClassAction(final JavaEditor editor) {
  		this(editor.getEditorSite());
  		fEditor= editor;
  		setEnabled(SelectionConverter.canOperateOn(fEditor));
  	}
  
  	/**
  	 * Creates a new extract super type action. 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 workbench site
  	 */
  	public ExtractSuperClassAction(final IWorkbenchSite site) {
  		super(site);
  		setText(RefactoringMessages.ExtractSuperTypeAction_label);
  		PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.EXTRACT_SUPERTYPE_ACTION);
  	}
  
  	private IMember getSelectedMemberFromEditor() throws JavaScriptModelException {
  		final IJavaScriptElement element= SelectionConverter.resolveEnclosingElement(fEditor, (ITextSelection) fEditor.getSelectionProvider().getSelection());
  		if (element == null || !(element instanceof IMember))
  			return null;
  		return (IMember) element;
  	}
  
  	/**
  	 * {@inheritDoc}
  	 */
  	public void run(final IStructuredSelection selection) {
  		try {
  			final IMember[] members= getSelectedMembers(selection);
  			if (RefactoringAvailabilityTester.isExtractSupertypeAvailable(members) && ActionUtil.isEditable(getShell(), members[0]))
  				RefactoringExecutionStarter.startExtractSupertypeRefactoring(members, getShell());
  		} catch (final JavaScriptModelException exception) {
  			ExceptionHandler.handle(exception, RefactoringMessages.OpenRefactoringWizardAction_refactoring, RefactoringMessages.OpenRefactoringWizardAction_exception);
  		}
  	}
  
  	/**
  	 * {@inheritDoc}
  	 */
  	public void run(final ITextSelection selection) {
  		try {
  			if (! ActionUtil.isEditable(fEditor))
  				return;
  			final IMember member= getSelectedMemberFromEditor();
  			final IMember[] array= new IMember[] { member};
  			if (member != null && RefactoringAvailabilityTester.isExtractSupertypeAvailable(array)) {
  				RefactoringExecutionStarter.startExtractSupertypeRefactoring(array, getShell());
  			} else {
  				MessageDialog.openInformation(getShell(), RefactoringMessages.OpenRefactoringWizardAction_unavailable, RefactoringMessages.ExtractSuperTypeAction_unavailable);
  			}
  		} catch (JavaScriptModelException exception) {
  			ExceptionHandler.handle(exception, RefactoringMessages.OpenRefactoringWizardAction_refactoring, RefactoringMessages.OpenRefactoringWizardAction_exception);
  		}
  	}
  
  	/**
  	 * {@inheritDoc}
  	 */
  	public void selectionChanged(final IStructuredSelection selection) {
  		try {
  			setEnabled(RefactoringAvailabilityTester.isExtractSupertypeAvailable(selection));
  		} catch (JavaScriptModelException exception) {
  			// http://bugs.eclipse.org/bugs/show_bug.cgi?id=19253
  			if (!(exception.getException() instanceof CharConversionException) && JavaModelUtil.isExceptionToBeLogged(exception))
  				JavaScriptPlugin.log(exception);
  			setEnabled(false);//no UI - happens on selection changes
  		}
  	}
  
  	/**
  	 * {@inheritDoc}
  	 */
  	public void selectionChanged(final ITextSelection selection) {
  		setEnabled(true);
  	}
  
  	/**
  	 * {@inheritDoc}
  	 */
  	public void selectionChanged(final JavaTextSelection selection) {
  		try {
  			setEnabled(RefactoringAvailabilityTester.isExtractSupertypeAvailable(selection));
  		} catch (JavaScriptModelException event) {
  			setEnabled(false);
  		}
  	}
  }
  