org.eclipse.egit.ui/src/org/eclipse/egit/ui/internal/reflog/command/AbstractReflogCommandHandler.java

   1 /*******************************************************************************
   2  * Copyright (C) 2011, Matthias Sohn <matthias.sohn@sap.com>
   3  *
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *******************************************************************************/
   9 package org.eclipse.egit.ui.internal.reflog.command;
  10
  11 import java.io.IOException;
  12
  13 import org.eclipse.core.commands.AbstractHandler;
  14 import org.eclipse.core.commands.ExecutionEvent;
  15 import org.eclipse.core.commands.ExecutionException;
  16 import org.eclipse.egit.ui.internal.UIText;
  17 import org.eclipse.egit.ui.internal.reflog.ReflogView;
  18 import org.eclipse.jface.viewers.IStructuredSelection;
  19 import org.eclipse.jgit.lib.Repository;
  20 import org.eclipse.jgit.revwalk.RevCommit;
  21 import org.eclipse.jgit.revwalk.RevWalk;
  22 import org.eclipse.jgit.internal.storage.file.ReflogEntry;
  23 import org.eclipse.ui.IWorkbenchPart;
  24 import org.eclipse.ui.IWorkbenchWindow;
  25 import org.eclipse.ui.PlatformUI;
  26 import org.eclipse.ui.handlers.HandlerUtil;
  27
  28 /**
  29  * Common helper methods for RefLogView command handlers
  30  */
  31 abstract class AbstractReflogCommandHandler extends AbstractHandler {
  32
  33         protected IWorkbenchPart getPart(ExecutionEvent event)
  34                         throws ExecutionException {
  35                 return HandlerUtil.getActivePartChecked(event);
  36         }
  37
  38         protected Repository getRepository(ExecutionEvent event) throws ExecutionException {
  39                 IWorkbenchPart part = getPart(event);
  40                 if (!(part instanceof ReflogView))
  41                         throw new ExecutionException(
  42                                         UIText.AbstractReflogCommandHandler_NoInput);
  43                 return (((ReflogView) part).getRepository());
  44         }
  45
  46         protected ReflogView getView() {
  47                 IWorkbenchWindow window = PlatformUI.getWorkbench()
  48                                 .getActiveWorkbenchWindow();
  49                 if (window == null)
  50                         return null;
  51                 if (window.getActivePage() == null)
  52                         return null;
  53                 IWorkbenchPart part = window.getActivePage().getActivePart();
  54                 if (!(part instanceof ReflogView))
  55                         return null;
  56                 return (ReflogView) part;
  57         }
  58
  59         /**
  60          * @param event
  61          * @param repo
  62          * @return commit selected in Reflog View
  63          * @throws ExecutionException
  64          */
  65         protected RevCommit getSelectedCommit(ExecutionEvent event, Repository repo)
  66                         throws ExecutionException {
  67                 ReflogEntry entry = (ReflogEntry) ((IStructuredSelection) HandlerUtil
  68                                 .getCurrentSelectionChecked(event)).getFirstElement();
  69                 if (entry == null)
  70                         return null;
  71
  72                 RevCommit commit = null;
  73                 RevWalk w = new RevWalk(repo);
  74                 try {
  75                         commit = w.parseCommit(entry.getNewId());
  76                 } catch (IOException e) {
  77                         throw new ExecutionException(e.getMessage(), e);
  78                 } finally {
  79                         w.release();
  80                 }
  81                 return commit;
  82         }
  83 }