case-study/jdt-before/ui/org/eclipse/jdt/internal/ui/callhierarchy/CopyCallHierarchyAction.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  *   Jesper Kamstrup Linnet (eclipse@kamstrup-linnet.dk) - initial API and implementation
  10  *          (report 36180: Callers/Callees view)
  11  *******************************************************************************/
  12 package org.eclipse.jdt.internal.ui.callhierarchy;
  13
  14 import java.io.BufferedReader;
  15 import java.io.IOException;
  16 import java.io.PrintWriter;
  17 import java.io.StringReader;
  18 import java.io.StringWriter;
  19
  20 import org.eclipse.osgi.util.TextProcessor;
  21
  22 import org.eclipse.swt.SWTError;
  23 import org.eclipse.swt.dnd.Clipboard;
  24 import org.eclipse.swt.dnd.DND;
  25 import org.eclipse.swt.dnd.TextTransfer;
  26 import org.eclipse.swt.dnd.Transfer;
  27 import org.eclipse.swt.widgets.TreeItem;
  28
  29 import org.eclipse.core.runtime.Assert;
  30
  31 import org.eclipse.jface.action.Action;
  32 import org.eclipse.jface.dialogs.MessageDialog;
  33 import org.eclipse.jface.viewers.ISelection;
  34 import org.eclipse.jface.viewers.ISelectionProvider;
  35
  36 import org.eclipse.ui.PlatformUI;
  37
  38 import org.eclipse.jdt.internal.ui.IJavaHelpContextIds;
  39 import org.eclipse.jdt.internal.ui.util.SelectionUtil;
  40
  41 class CopyCallHierarchyAction extends Action {
  42         private static final char INDENTATION= '\t';
  43
  44         private CallHierarchyViewPart fView;
  45
  46         private CallHierarchyViewer fViewer;
  47
  48         private final Clipboard fClipboard;
  49
  50         public CopyCallHierarchyAction(CallHierarchyViewPart view, Clipboard clipboard, CallHierarchyViewer viewer) {
  51                 super(CallHierarchyMessages.CopyCallHierarchyAction_label);
  52                 Assert.isNotNull(clipboard);
  53                 PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.CALL_HIERARCHY_COPY_ACTION);
  54                 fView= view;
  55                 fClipboard= clipboard;
  56                 fViewer= viewer;
  57         }
  58
  59         public boolean canActionBeAdded() {
  60                 Object element= SelectionUtil.getSingleElement(getSelection());
  61                 return element != null;
  62         }
  63
  64         private ISelection getSelection() {
  65                 ISelectionProvider provider= fView.getSite().getSelectionProvider();
  66
  67                 if (provider != null) {
  68                         return provider.getSelection();
  69                 }
  70
  71                 return null;
  72         }
  73
  74         /*
  75          * @see IAction#run()
  76          */
  77         @Override
  78         public void run() {
  79                 StringBuffer buf= new StringBuffer();
  80                 addCalls(fViewer.getTree().getSelection()[0], 0, buf);
  81
  82                 TextTransfer plainTextTransfer= TextTransfer.getInstance();
  83                 try {
  84                         fClipboard.setContents(
  85                                         new String[] { convertLineTerminators(buf.toString()) },
  86                                         new Transfer[] { plainTextTransfer });
  87                 } catch (SWTError e) {
  88                         if (e.code != DND.ERROR_CANNOT_SET_CLIPBOARD)
  89                                 throw e;
  90                         if (MessageDialog.openQuestion(fView.getViewSite().getShell(), CallHierarchyMessages.CopyCallHierarchyAction_problem, CallHierarchyMessages.CopyCallHierarchyAction_clipboard_busy))
  91                                 run();
  92                 }
  93         }
  94
  95         /**
  96          * Adds the specified {@link TreeItem}'s text to the StringBuffer.
  97          *
  98          * @param item the tree item
  99          * @param indent the indent size
 100          * @param buf the string buffer
 101          */
 102         private void addCalls(TreeItem item, int indent, StringBuffer buf) {
 103                 for (int i= 0; i < indent; i++) {
 104                         buf.append(INDENTATION);
 105                 }
 106
 107                 buf.append(TextProcessor.deprocess(item.getText()));
 108                 buf.append('\n');
 109
 110                 if (item.getExpanded()) {
 111                         TreeItem[] items= item.getItems();
 112                         for (int i= 0; i < items.length; i++) {
 113                                 addCalls(items[i], indent + 1, buf);
 114                         }
 115                 }
 116         }
 117
 118         static String convertLineTerminators(String in) {
 119                 StringWriter stringWriter= new StringWriter();
 120                 PrintWriter printWriter= new PrintWriter(stringWriter);
 121                 StringReader stringReader= new StringReader(in);
 122                 BufferedReader bufferedReader= new BufferedReader(stringReader);
 123                 try {
 124                         String line= bufferedReader.readLine();
 125                         while (line != null) {
 126                                 printWriter.print(line);
 127                                 line= bufferedReader.readLine();
 128                                 if (line != null && line.length() != 0)
 129                                         printWriter.println();
 130
 131                         }
 132                 } catch (IOException e) {
 133                         return in; // return the call hierarchy unfiltered
 134                 }
 135                 return stringWriter.toString();
 136         }
 137 }