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/*******************************************************************************
* Copyright (C) 2011, 2014 Mathias Kinzler <mathias.kinzler@sap.com> and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*******************************************************************************/
package org.eclipse.egit.ui.internal.actions;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.TreeMap;
import org.eclipse.egit.ui.Activator;
import org.eclipse.egit.ui.internal.CommonUtils;
import org.eclipse.egit.ui.internal.SWTUtils;
import org.eclipse.egit.ui.internal.UIIcons;
import org.eclipse.egit.ui.internal.UIText;
import org.eclipse.egit.ui.internal.branch.BranchOperationUI;
import org.eclipse.egit.ui.internal.selection.SelectionUtils;
import org.eclipse.jface.action.ContributionItem;
import org.eclipse.jgit.lib.CheckoutEntry;
import org.eclipse.jgit.lib.ConfigConstants;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.ReflogEntry;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.ui.handlers.IHandlerService;
import org.eclipse.ui.menus.IWorkbenchContribution;
import org.eclipse.ui.services.IServiceLocator;
/**
* Dynamically builds the "Switch to..." sub-menu
*/
public class SwitchToMenu extends ContributionItem implements
IWorkbenchContribution {
/** the maximum number of branches to show in the sub-menu */
static final int MAX_NUM_MENU_ENTRIES = 20;
private IHandlerService handlerService;
private final Image branchImage;
private final Image newBranchImage;
private final Image checkedOutImage;
/**
*/
public SwitchToMenu() {
this(null);
}
/**
* @param id
*/
public SwitchToMenu(String id) {
super(id);
branchImage = UIIcons.BRANCH.createImage();
newBranchImage = UIIcons.CREATE_BRANCH.createImage();
// create the "checked out" image
checkedOutImage = SWTUtils.getDecoratedImage(branchImage,
UIIcons.OVR_CHECKEDOUT);
}
@Override
public void fill(Menu menu, int index) {
if (handlerService == null)
return;
Repository repository = SelectionUtils
.getRepository(handlerService.getCurrentState());
if (repository != null)
createDynamicMenu(menu, repository);
}
private void createDynamicMenu(Menu menu, final Repository repository) {
MenuItem newBranch = new MenuItem(menu, SWT.PUSH);
newBranch.setText(UIText.SwitchToMenu_NewBranchMenuLabel);
newBranch.setImage(newBranchImage);
newBranch.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
String sourceRef = repository.getConfig().getString(
ConfigConstants.CONFIG_WORKFLOW_SECTION, null,
ConfigConstants.CONFIG_KEY_DEFBRANCHSTARTPOINT);
try {
Ref ref = repository.getRef(sourceRef);
if (ref != null)
BranchOperationUI.createWithRef(repository,
ref.getName()).start();
else
BranchOperationUI.create(repository).start();
} catch (IOException e1) {
BranchOperationUI.create(repository).start();
}
}
});
createSeparator(menu);
try {
String currentBranch = repository.getFullBranch();
Map<String, Ref> localBranches = repository.getRefDatabase().getRefs(
Constants.R_HEADS);
TreeMap<String, Ref> sortedRefs = new TreeMap<String, Ref>(
CommonUtils.STRING_ASCENDING_COMPARATOR);
// Add the MAX_NUM_MENU_ENTRIES most recently used branches first
List<ReflogEntry> reflogEntries = repository.getReflogReader(
Constants.HEAD).getReverseEntries();
for (ReflogEntry entry : reflogEntries) {
CheckoutEntry checkout = entry.parseCheckout();
if (checkout != null) {
Ref ref = localBranches.get(checkout.getFromBranch());
if (ref != null)
if (sortedRefs.size() < MAX_NUM_MENU_ENTRIES)
sortedRefs.put(checkout.getFromBranch(), ref);
ref = localBranches.get(checkout.getToBranch());
if (ref != null)
if (sortedRefs.size() < MAX_NUM_MENU_ENTRIES)
sortedRefs.put(checkout.getToBranch(), ref);
}
}
// Add the recently used branches to the menu, in alphabetical order
int itemCount = 0;
for (final Entry<String, Ref> entry : sortedRefs.entrySet()) {
itemCount++;
final String shortName = entry.getKey();
final String fullName = entry.getValue().getName();
createMenuItem(menu, repository, currentBranch, fullName, shortName);
// Do not duplicate branch names
localBranches.remove(shortName);
}
if (itemCount < MAX_NUM_MENU_ENTRIES) {
// A separator between recently used branches and local branches is
// nice but only if we have both recently used branches and other
// local branches
if (itemCount > 0 && localBranches.size() > 0)
createSeparator(menu);
// Now add more other branches if we have only a few branch switches
// Sort the remaining local branches
sortedRefs.clear();
sortedRefs.putAll(localBranches);
for (final Entry<String, Ref> entry : sortedRefs.entrySet()) {
itemCount++;
// protect ourselves against a huge sub-menu
if (itemCount > MAX_NUM_MENU_ENTRIES)
break;
final String fullName = entry.getValue().getName();
final String shortName = entry.getKey();
createMenuItem(menu, repository, currentBranch, fullName, shortName);
}
}
if (itemCount > 0)
createSeparator(menu);
MenuItem others = new MenuItem(menu, SWT.PUSH);
others.setText(UIText.SwitchToMenu_OtherMenuLabel);
others.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
BranchOperationUI.checkout(repository).start();
}
});
} catch (IOException e) {
Activator.handleError(e.getMessage(), e, true);
}
}
private static MenuItem createSeparator(Menu menu) {
return new MenuItem(menu, SWT.SEPARATOR);
}
private void createMenuItem(Menu menu, final Repository repository,
String currentBranch, final String fullName, String shortName) {
final MenuItem item = new MenuItem(menu, SWT.PUSH);
item.setText(shortName);
boolean checkedOut = currentBranch.equals(fullName);
if (checkedOut)
item.setImage(checkedOutImage);
else
item.setImage(branchImage);
item.setEnabled(!checkedOut);
item.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
BranchOperationUI.checkout(repository, fullName)
.start();
}
});
}
@Override
public boolean isDynamic() {
return true;
}
public void initialize(IServiceLocator serviceLocator) {
handlerService = CommonUtils.getService(serviceLocator, IHandlerService.class);
}
@Override
public void dispose() {
branchImage.dispose();
newBranchImage.dispose();
checkedOutImage.dispose();
}
}
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