case-study/jdt-before/ui/org/eclipse/jdt/ui/actions/FindBreakContinueTargetOccurrencesAction.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 org.eclipse.swt.widgets.Shell;
  14
  15 import org.eclipse.jface.viewers.IStructuredSelection;
  16
  17 import org.eclipse.jface.text.ITextSelection;
  18
  19 import org.eclipse.ui.IWorkbenchSite;
  20 import org.eclipse.ui.PlatformUI;
  21
  22 import org.eclipse.ui.texteditor.IEditorStatusLine;
  23
  24 import org.eclipse.jdt.core.ITypeRoot;
  25 import org.eclipse.jdt.core.JavaModelException;
  26 import org.eclipse.jdt.core.dom.CompilationUnit;
  27
  28 import org.eclipse.jdt.ui.JavaUI;
  29
  30 import org.eclipse.jdt.internal.ui.IJavaHelpContextIds;
  31 import org.eclipse.jdt.internal.ui.JavaPlugin;
  32 import org.eclipse.jdt.internal.ui.actions.ActionMessages;
  33 import org.eclipse.jdt.internal.ui.actions.ActionUtil;
  34 import org.eclipse.jdt.internal.ui.javaeditor.JavaEditor;
  35 import org.eclipse.jdt.internal.ui.javaeditor.JavaTextSelection;
  36 import org.eclipse.jdt.internal.ui.search.BreakContinueTargetFinder;
  37 import org.eclipse.jdt.internal.ui.search.FindOccurrencesEngine;
  38
  39 /**
  40  * Action to find all break/continue targets for a given break or continue statement.
  41  * <p>
  42  * This class may be instantiated; it is not intended to be subclassed.
  43  * </p>
  44  *
  45  * @since 3.4
  46  *
  47  * @noextend This class is not intended to be subclassed by clients.
  48  */
  49 public class FindBreakContinueTargetOccurrencesAction extends SelectionDispatchAction {
  50
  51         private JavaEditor fEditor;
  52
  53         /**
  54          * Note: This constructor is for internal use only. Clients should not call this constructor.
  55          *
  56          * @param editor the Java editor
  57          *
  58          * @noreference This constructor is not intended to be referenced by clients.
  59          */
  60         public FindBreakContinueTargetOccurrencesAction(JavaEditor editor) {
  61                 this(editor.getEditorSite());
  62                 fEditor= editor;
  63                 setEnabled(getEditorInput(editor) != null);
  64         }
  65
  66         /**
  67          * Creates a new {@link FindBreakContinueTargetOccurrencesAction}. The action
  68          * requires that the selection provided by the site's selection provider is of type
  69          * <code>IStructuredSelection</code>.
  70          *
  71          * @param site the site providing context information for this action
  72          */
  73         public FindBreakContinueTargetOccurrencesAction(IWorkbenchSite site) {
  74                 super(site);
  75                 setText(ActionMessages.FindBreakContinueTargetOccurrencesAction_label);
  76                 setToolTipText(ActionMessages.FindBreakContinueTargetOccurrencesAction_tooltip);
  77                 PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.FIND_BREAK_CONTINUE_TARGET_OCCURRENCES);
  78         }
  79
  80         //---- Text Selection ----------------------------------------------------------------------
  81
  82         /**
  83          * {@inheritDoc}
  84          */
  85         @Override
  86         public void selectionChanged(ITextSelection selection) {
  87                 setEnabled(true);
  88         }
  89
  90         /**
  91          * Note: This method is for internal use only. Clients should not call this method.
  92          *
  93          * @param selection the selection
  94          *
  95          * @noreference This method is not intended to be referenced by clients.
  96          */
  97         @Override
  98         public void selectionChanged(JavaTextSelection selection) {
  99                 CompilationUnit astRoot= selection.resolvePartialAstAtOffset();
 100                 setEnabled(astRoot != null && new BreakContinueTargetFinder().initialize(astRoot, selection.getOffset(), selection.getLength()) == null);
 101         }
 102
 103         /**
 104          * {@inheritDoc}
 105          */
 106         @Override
 107         public void selectionChanged(IStructuredSelection selection) {
 108                 setEnabled(false);
 109         }
 110
 111         /* (non-JavaDoc)
 112          * Method declared in SelectionDispatchAction.
 113          */
 114         @Override
 115         public final void run(ITextSelection ts) {
 116                 ITypeRoot input= getEditorInput(fEditor);
 117                 if (!ActionUtil.isProcessable(getShell(), input))
 118                         return;
 119                 FindOccurrencesEngine engine= FindOccurrencesEngine.create(new BreakContinueTargetFinder());
 120                 try {
 121                         String result= engine.run(input, ts.getOffset(), ts.getLength());
 122                         if (result != null)
 123                                 showMessage(getShell(), fEditor, result);
 124                 } catch (JavaModelException e) {
 125                         JavaPlugin.log(e);
 126                 }
 127         }
 128
 129         private static ITypeRoot getEditorInput(JavaEditor editor) {
 130                 return JavaUI.getEditorInputTypeRoot(editor.getEditorInput());
 131         }
 132
 133         private static void showMessage(Shell shell, JavaEditor editor, String msg) {
 134                 IEditorStatusLine statusLine= (IEditorStatusLine) editor.getAdapter(IEditorStatusLine.class);
 135                 if (statusLine != null)
 136                         statusLine.setMessage(true, msg, null);
 137                 shell.getDisplay().beep();
 138         }
 139 }