case-study/jdt-after/ui/org/eclipse/jdt/ui/actions/PushDownAction.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.ui.actions;
  12
  13 import java.util.Arrays;
  14 import java.util.HashSet;
  15 import java.util.Iterator;
  16 import java.util.Set;
  17
  18 import org.eclipse.jface.dialogs.MessageDialog;
  19 import org.eclipse.jface.viewers.IStructuredSelection;
  20
  21 import org.eclipse.jface.text.ITextSelection;
  22
  23 import org.eclipse.ui.IWorkbenchSite;
  24 import org.eclipse.ui.PlatformUI;
  25
  26 import org.eclipse.jdt.core.IMember;
  27 import org.eclipse.jdt.core.IType;
  28 import org.eclipse.jdt.core.JavaModelException;
  29
  30 import org.eclipse.jdt.internal.corext.refactoring.RefactoringAvailabilityTester;
  31 import org.eclipse.jdt.internal.corext.refactoring.RefactoringExecutionStarter;
  32 import org.eclipse.jdt.internal.corext.util.JavaModelUtil;
  33
  34 import org.eclipse.jdt.internal.ui.IJavaHelpContextIds;
  35 import org.eclipse.jdt.internal.ui.JavaPlugin;
  36 import org.eclipse.jdt.internal.ui.actions.ActionUtil;
  37 import org.eclipse.jdt.internal.ui.actions.SelectionConverter;
  38 import org.eclipse.jdt.internal.ui.javaeditor.JavaEditor;
  39 import org.eclipse.jdt.internal.ui.javaeditor.JavaTextSelection;
  40 import org.eclipse.jdt.internal.ui.refactoring.RefactoringMessages;
  41 import org.eclipse.jdt.internal.ui.util.ExceptionHandler;
  42
  43 /**
  44  * Action to push down methods and fields into subclasses.
  45  * <p>
  46  * Action is applicable to selections containing elements of type
  47  * <code>IField</code> and <code>IMethod</code>.
  48  *
  49  * <p>
  50  * This class may be instantiated; it is not intended to be subclassed.
  51  * </p>
  52  *
  53  * @since 2.1
  54  *
  55  * @noextend This class is not intended to be subclassed by clients.
  56  */
  57 public class PushDownAction extends SelectionDispatchAction {
  58
  59         private static IMember[] getSelectedMembers(IStructuredSelection selection) {
  60                 if (selection.isEmpty())
  61                         return null;
  62                 if (selection.size() == 1) {
  63                         try {
  64                                 final IType type= RefactoringAvailabilityTester.getSingleSelectedType(selection);
  65                                 if (type != null)
  66                                         return new IType[] { type};
  67                         } catch (JavaModelException exception) {
  68                                 JavaPlugin.log(exception);
  69                         }
  70                 }
  71                 for (Iterator<?> iter= selection.iterator(); iter.hasNext();) {
  72                         if (!(iter.next() instanceof IMember))
  73                                 return null;
  74                 }
  75                 Set<Object> memberSet= new HashSet<Object>();
  76                 memberSet.addAll(Arrays.asList(selection.toArray()));
  77                 return memberSet.toArray(new IMember[memberSet.size()]);
  78         }
  79
  80         public JavaEditor fEditor;
  81
  82         /**
  83          * Note: This constructor is for internal use only. Clients should not call
  84          * this constructor.
  85          *
  86          * @param editor the java editor
  87          *
  88          * @noreference This constructor is not intended to be referenced by clients.
  89          */
  90         public PushDownAction(JavaEditor editor) {
  91                 this(editor.getEditorSite());
  92                 fEditor= editor;
  93                 setEnabled(SelectionConverter.canOperateOn(fEditor));
  94         }
  95
  96         /**
  97          * Creates a new <code>PushDownAction</code>. The action requires that
  98          * the selection provided by the site's selection provider is of type <code>
  99          * org.eclipse.jface.viewers.IStructuredSelection</code>.
 100          *
 101          * @param site
 102          *            the site providing context information for this action
 103          */
 104         public PushDownAction(IWorkbenchSite site) {
 105                 super(site);
 106                 setText(RefactoringMessages.PushDownAction_Push_Down);
 107                 PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.PUSH_DOWN_ACTION);
 108         }
 109
 110         private IMember getSelectedMemberFromEditor() throws JavaModelException {
 111                 return fEditor.generated_1379287974725836368();
 112         }
 113
 114         /**
 115          * {@inheritDoc}
 116          */
 117         @Override
 118         public void run(IStructuredSelection selection) {
 119                 try {
 120                         IMember[] members= getSelectedMembers(selection);
 121                         if (RefactoringAvailabilityTester.isPushDownAvailable(members) && ActionUtil.isEditable(getShell(), members[0]))
 122                                 RefactoringExecutionStarter.startPushDownRefactoring(members, getShell());
 123                 } catch (JavaModelException e) {
 124                         ExceptionHandler.handle(e, RefactoringMessages.OpenRefactoringWizardAction_refactoring, RefactoringMessages.OpenRefactoringWizardAction_exception);
 125                 }
 126         }
 127
 128         /**
 129          * {@inheritDoc}
 130          */
 131         @Override
 132         public void run(ITextSelection selection) {
 133                 try {
 134                         if (!ActionUtil.isEditable(fEditor))
 135                                 return;
 136                         IMember member= getSelectedMemberFromEditor();
 137                         IMember[] array= new IMember[] { member};
 138                         if (member != null && RefactoringAvailabilityTester.isPushDownAvailable(array)) {
 139                                 RefactoringExecutionStarter.startPushDownRefactoring(array, getShell());
 140                         } else {
 141                                 MessageDialog.openInformation(getShell(), RefactoringMessages.OpenRefactoringWizardAction_unavailable, RefactoringMessages.PushDownAction_To_activate);
 142                         }
 143                 } catch (JavaModelException e) {
 144                         ExceptionHandler.handle(e, RefactoringMessages.OpenRefactoringWizardAction_refactoring, RefactoringMessages.OpenRefactoringWizardAction_exception);
 145                 }
 146         }
 147
 148         /**
 149          * {@inheritDoc}
 150          */
 151         @Override
 152         public void selectionChanged(IStructuredSelection selection) {
 153                 try {
 154                         setEnabled(RefactoringAvailabilityTester.isPushDownAvailable(selection));
 155                 } catch (JavaModelException e) {
 156                         // http://bugs.eclipse.org/bugs/show_bug.cgi?id=19253
 157                         if (JavaModelUtil.isExceptionToBeLogged(e))
 158                                 JavaPlugin.log(e);
 159                         setEnabled(false);// no UI
 160                 }
 161         }
 162
 163         /**
 164          * {@inheritDoc}
 165          */
 166         @Override
 167         public void selectionChanged(ITextSelection selection) {
 168                 setEnabled(true);
 169         }
 170
 171         /**
 172          * Note: This method is for internal use only. Clients should not call this method.
 173          *
 174          * @param selection the Java text selection
 175          * @noreference This method is not intended to be referenced by clients.
 176          */
 177         @Override
 178         public void selectionChanged(JavaTextSelection selection) {
 179                 try {
 180                         setEnabled(RefactoringAvailabilityTester.isPushDownAvailable(selection));
 181                 } catch (JavaModelException e) {
 182                         setEnabled(false);
 183                 }
 184         }
 185 }