org.eclipse.egit.ui.internal.repository.tree.command.CreateBranchCommand.java Source code

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Here is the source code for org.eclipse.egit.ui.internal.repository.tree.command.CreateBranchCommand.java

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/*******************************************************************************
 * Copyright (c) 2010 SAP AG.
 * 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
 *
 * Contributors:
 *    Mathias Kinzler (SAP AG) - initial implementation
 *******************************************************************************/
package org.eclipse.egit.ui.internal.repository.tree.command;

import java.io.IOException;

import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.egit.ui.Activator;
import org.eclipse.egit.ui.internal.repository.CreateBranchWizard;
import org.eclipse.egit.ui.internal.repository.tree.RepositoryTreeNode;
import org.eclipse.egit.ui.internal.repository.tree.RepositoryTreeNodeType;
import org.eclipse.jface.wizard.WizardDialog;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;

/**
 * Creates a branch using a simple dialog.
 * <p>
 * This is context-sensitive as it suggests the currently selected branch or (if
 * not started from a branch) the currently checked-out branch as source branch.
 * The user can override this suggestion.
 */
public class CreateBranchCommand extends RepositoriesViewCommandHandler<RepositoryTreeNode> {
    public Object execute(ExecutionEvent event) throws ExecutionException {
        final RepositoryTreeNode node = getSelectedNodes(event).get(0);

        if (node.getType() == RepositoryTreeNodeType.ADDITIONALREF) {
            Ref ref = (Ref) node.getObject();
            try {
                RevCommit baseCommit = new RevWalk(node.getRepository()).parseCommit(ref.getLeaf().getObjectId());
                WizardDialog dlg = new WizardDialog(getShell(event),
                        new CreateBranchWizard(node.getRepository(), baseCommit));
                dlg.setHelpAvailable(false);
                dlg.open();
            } catch (IOException e) {
                Activator.handleError(e.getMessage(), e, true);
            }
            return null;
        }
        final Ref baseBranch;
        if (node.getObject() instanceof Ref)
            baseBranch = (Ref) node.getObject();
        else {
            // we are on another node, so we have no Ref as context
            // -> try to determine the currently checked out branch
            Ref branch;
            try {
                if (node.getRepository().getFullBranch().startsWith(Constants.R_HEADS)) {
                    // simple case: local branch checked out
                    branch = node.getRepository().getRef(node.getRepository().getFullBranch());
                } else {
                    // remote branch or tag checked out: resolve the commit
                    String ref = Activator.getDefault().getRepositoryUtil().mapCommitToRef(node.getRepository(),
                            node.getRepository().getFullBranch(), false);
                    if (ref == null)
                        branch = null;
                    else {
                        if (ref.startsWith(Constants.R_TAGS))
                            // if a tag is checked out, we don't suggest
                            // anything
                            branch = null;
                        else
                            branch = node.getRepository().getRef(ref);
                    }
                }
            } catch (IOException e) {
                branch = null;
            }
            baseBranch = branch;
        }
        new WizardDialog(getShell(event), new CreateBranchWizard(node.getRepository(), baseBranch)).open();
        return null;
    }
}