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 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.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;
  import org.eclipse.wst.jsdt.ui.actions.SelectionDispatchAction;
  
  public class MoveStaticMembersAction extends SelectionDispatchAction{
  	
  	private JavaEditor fEditor;
  
  	public MoveStaticMembersAction(IWorkbenchSite site) {
  		super(site);
  		setText(RefactoringMessages.RefactoringGroup_move_label);
  		PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.MOVE_ACTION);		
  	}
  
  	public MoveStaticMembersAction(JavaEditor editor) {
  		this(editor.getEditorSite());
  		fEditor= editor;
  		setEnabled(SelectionConverter.canOperateOn(fEditor));
  	}
  		
  	public void selectionChanged(IStructuredSelection selection) {
  		try {
  			setEnabled(RefactoringAvailabilityTester.isMoveStaticMembersAvailable(getSelectedMembers(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
  		}
  	}
  
  	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.isMoveStaticAvailable(selection));
  		} catch (JavaScriptModelException e) {
  			setEnabled(false);
  		}
  	}
  
  	public void run(IStructuredSelection selection) {
  		try {
  			IMember[] members= getSelectedMembers(selection);
  			for (int index= 0; index < members.length; index++) {
  				if (!ActionUtil.isEditable(getShell(), members[index]))
  					return;
  			}
  			if (RefactoringAvailabilityTester.isMoveStaticMembersAvailable(members))
  				RefactoringExecutionStarter.startMoveStaticMembersRefactoring(members, getShell());
  		} catch (JavaScriptModelException e) {
  			ExceptionHandler.handle(e, RefactoringMessages.OpenRefactoringWizardAction_refactoring, RefactoringMessages.OpenRefactoringWizardAction_exception); 
  		}
  	}
  
  	public void run(ITextSelection selection) {
  		try {
  			IMember member= getSelectedMemberFromEditor();
  			if (!ActionUtil.isEditable(fEditor, getShell(), member))
  				return;
  			IMember[] array= new IMember[]{member};
  			if (member != null && RefactoringAvailabilityTester.isMoveStaticMembersAvailable(array)){
  				RefactoringExecutionStarter.startMoveStaticMembersRefactoring(array, getShell());	
  			} else {
  				MessageDialog.openInformation(getShell(), RefactoringMessages.OpenRefactoringWizardAction_unavailable, RefactoringMessages.MoveMembersAction_unavailable); 
  			}
  		} catch (JavaScriptModelException e) {
  			ExceptionHandler.handle(e, RefactoringMessages.OpenRefactoringWizardAction_refactoring, RefactoringMessages.OpenRefactoringWizardAction_exception); 
  		}
  	}
  	
  	private static IMember[] getSelectedMembers(IStructuredSelection selection){
  		if (selection.isEmpty())
  			return null;
  		
  		for  (final Iterator iterator= selection.iterator(); iterator.hasNext(); ) {
  			if (! (iterator.next() instanceof IMember))
  				return null;
  		}
  		Set memberSet= new HashSet();
  		memberSet.addAll(Arrays.asList(selection.toArray()));
  		return (IMember[]) memberSet.toArray(new IMember[memberSet.size()]);
  	}
  
  	private IMember getSelectedMemberFromEditor() throws JavaScriptModelException{
  		IJavaScriptElement element= SelectionConverter.getElementAtOffset(fEditor);
  		if (element == null || ! (element instanceof IMember))
  			return null;
  		return (IMember)element;
  	}
  }
  