case-study/jdt-after/ui refactoring/org/eclipse/jdt/internal/ui/refactoring/actions/MoveInstanceMethodAction.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2011 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Eclipse Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/epl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package org.eclipse.jdt.internal.ui.refactoring.actions;
  12
  13 import org.eclipse.core.runtime.Assert;
  14 import org.eclipse.core.runtime.CoreException;
  15
  16 import org.eclipse.jface.dialogs.MessageDialog;
  17 import org.eclipse.jface.viewers.IStructuredSelection;
  18
  19 import org.eclipse.jface.text.ITextSelection;
  20
  21 import org.eclipse.ui.IWorkbenchSite;
  22 import org.eclipse.ui.PlatformUI;
  23
  24 import org.eclipse.jdt.core.ICompilationUnit;
  25 import org.eclipse.jdt.core.IJavaElement;
  26 import org.eclipse.jdt.core.IMethod;
  27 import org.eclipse.jdt.core.JavaModelException;
  28
  29 import org.eclipse.jdt.internal.corext.refactoring.RefactoringAvailabilityTester;
  30 import org.eclipse.jdt.internal.corext.refactoring.RefactoringExecutionStarter;
  31 import org.eclipse.jdt.internal.corext.util.JavaModelUtil;
  32
  33 import org.eclipse.jdt.ui.actions.SelectionDispatchAction;
  34
  35 import org.eclipse.jdt.internal.ui.IJavaHelpContextIds;
  36 import org.eclipse.jdt.internal.ui.JavaPlugin;
  37 import org.eclipse.jdt.internal.ui.actions.ActionUtil;
  38 import org.eclipse.jdt.internal.ui.actions.SelectionConverter;
  39 import org.eclipse.jdt.internal.ui.javaeditor.JavaEditor;
  40 import org.eclipse.jdt.internal.ui.javaeditor.JavaTextSelection;
  41 import org.eclipse.jdt.internal.ui.refactoring.RefactoringMessages;
  42 import org.eclipse.jdt.internal.ui.util.ExceptionHandler;
  43
  44 public final class MoveInstanceMethodAction extends SelectionDispatchAction {
  45
  46         private JavaEditor fEditor;
  47
  48         /**
  49          * Note: This constructor is for internal use only. Clients should not call this constructor.
  50          * @param editor the java editor
  51          */
  52         public MoveInstanceMethodAction(JavaEditor editor) {
  53                 this(editor.getEditorSite());
  54                 fEditor= editor;
  55                 setEnabled(SelectionConverter.canOperateOn(fEditor));
  56         }
  57
  58         public MoveInstanceMethodAction(IWorkbenchSite site) {
  59                 super(site);
  60                 setText(RefactoringMessages.MoveInstanceMethodAction_Move_Method);
  61                 PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.MOVE_ACTION);
  62         }
  63
  64         /*
  65          * @see SelectionDispatchAction#selectionChanged(IStructuredSelection)
  66          */
  67         @Override
  68         public void selectionChanged(IStructuredSelection selection) {
  69                 try {
  70                         setEnabled(RefactoringAvailabilityTester.isMoveMethodAvailable(selection));
  71                 } catch (JavaModelException e) {
  72                         // http://bugs.eclipse.org/bugs/show_bug.cgi?id=19253
  73                         if (JavaModelUtil.isExceptionToBeLogged(e))
  74                                 JavaPlugin.log(e);
  75                         setEnabled(false);//no ui
  76                 }
  77         }
  78
  79         @Override
  80         public void selectionChanged(ITextSelection selection) {
  81                 setEnabled(true);
  82     }
  83
  84         /**
  85          * Note: This method is for internal use only. Clients should not call this method.
  86          */
  87         @Override
  88         public void selectionChanged(JavaTextSelection selection) {
  89                 try {
  90                         setEnabled(RefactoringAvailabilityTester.isMoveMethodAvailable(selection));
  91                 } catch (CoreException e) {
  92                         setEnabled(false);
  93                 }
  94         }
  95
  96         private static IMethod getSingleSelectedMethod(IStructuredSelection selection) {
  97                 if (selection.isEmpty() || selection.size() != 1)
  98                         return null;
  99
 100                 Object first= selection.getFirstElement();
 101                 if (! (first instanceof IMethod))
 102                         return null;
 103                 return (IMethod) first;
 104         }
 105         /*
 106          * @see SelectionDispatchAction#run(IStructuredSelection)
 107          */
 108         @Override
 109         public void run(IStructuredSelection selection) {
 110                 try {
 111                         Assert.isTrue(RefactoringAvailabilityTester.isMoveMethodAvailable(selection));
 112                         IMethod method= getSingleSelectedMethod(selection);
 113                         Assert.isNotNull(method);
 114                         if (!ActionUtil.isEditable(fEditor, getShell(), method))
 115                                 return;
 116                         RefactoringExecutionStarter.startMoveMethodRefactoring(method, getShell());
 117                 } catch (JavaModelException e) {
 118                         ExceptionHandler.handle(e, getShell(), RefactoringMessages.MoveInstanceMethodAction_dialog_title, RefactoringMessages.MoveInstanceMethodAction_unexpected_exception);
 119                 }
 120         }
 121
 122         /* (non-Javadoc)
 123          * Method declared on SelectionDispatchAction
 124          */
 125         @Override
 126         public void run(ITextSelection selection) {
 127                 try {
 128                         run(selection, SelectionConverter.getInputAsCompilationUnit(fEditor));
 129                 } catch (JavaModelException e) {
 130                         ExceptionHandler.handle(e, getShell(), RefactoringMessages.MoveInstanceMethodAction_dialog_title, RefactoringMessages.MoveInstanceMethodAction_unexpected_exception);
 131                 }
 132         }
 133
 134         private void run(ITextSelection selection, ICompilationUnit cu) throws JavaModelException {
 135                 Assert.isNotNull(cu);
 136                 Assert.isTrue(selection.getOffset() >= 0);
 137                 Assert.isTrue(selection.getLength() >= 0);
 138
 139                 if (!ActionUtil.isEditable(fEditor, getShell(), cu))
 140                         return;
 141
 142                 IMethod method= getMethod(cu, selection);
 143                 if (method != null) {
 144                         RefactoringExecutionStarter.startMoveMethodRefactoring(method, getShell());
 145                 } else {
 146                         MessageDialog.openInformation(getShell(), RefactoringMessages.MoveInstanceMethodAction_dialog_title, RefactoringMessages.MoveInstanceMethodAction_No_reference_or_declaration);
 147                 }
 148         }
 149
 150         private static IMethod getMethod(ICompilationUnit cu, ITextSelection selection) throws JavaModelException {
 151                 IJavaElement element= SelectionConverter.getElementAtOffset(cu, selection);
 152                 if (element instanceof IMethod)
 153                         return (IMethod) element;
 154                 return null;
 155         }
 156 }