CheckoutCommand.java

  1. /*
  2.  * Copyright (C) 2010, Chris Aniszczyk <caniszczyk@gmail.com>
  3.  * Copyright (C) 2011, Matthias Sohn <matthias.sohn@sap.com> and others
  4.  *
  5.  * This program and the accompanying materials are made available under the
  6.  * terms of the Eclipse Distribution License v. 1.0 which is available at
  7.  * https://www.eclipse.org/org/documents/edl-v10.php.
  8.  *
  9.  * SPDX-License-Identifier: BSD-3-Clause
  10.  */
  11. package org.eclipse.jgit.api;

  13. import static org.eclipse.jgit.treewalk.TreeWalk.OperationType.CHECKOUT_OP;

  15. import java.io.IOException;
  16. import java.text.MessageFormat;
  17. import java.util.ArrayList;
  18. import java.util.EnumSet;
  19. import java.util.HashSet;
  20. import java.util.LinkedList;
  21. import java.util.List;
  22. import java.util.Set;

  24. import org.eclipse.jgit.api.CheckoutResult.Status;
  25. import org.eclipse.jgit.api.errors.CheckoutConflictException;
  26. import org.eclipse.jgit.api.errors.GitAPIException;
  27. import org.eclipse.jgit.api.errors.InvalidRefNameException;
  28. import org.eclipse.jgit.api.errors.JGitInternalException;
  29. import org.eclipse.jgit.api.errors.RefAlreadyExistsException;
  30. import org.eclipse.jgit.api.errors.RefNotFoundException;
  31. import org.eclipse.jgit.dircache.DirCache;
  32. import org.eclipse.jgit.dircache.DirCacheCheckout;
  33. import org.eclipse.jgit.dircache.DirCacheCheckout.CheckoutMetadata;
  34. import org.eclipse.jgit.dircache.DirCacheEditor;
  35. import org.eclipse.jgit.dircache.DirCacheEditor.PathEdit;
  36. import org.eclipse.jgit.dircache.DirCacheEntry;
  37. import org.eclipse.jgit.dircache.DirCacheIterator;
  38. import org.eclipse.jgit.errors.AmbiguousObjectException;
  39. import org.eclipse.jgit.errors.UnmergedPathException;
  40. import org.eclipse.jgit.events.WorkingTreeModifiedEvent;
  41. import org.eclipse.jgit.internal.JGitText;
  42. import org.eclipse.jgit.lib.AnyObjectId;
  43. import org.eclipse.jgit.lib.Constants;
  44. import org.eclipse.jgit.lib.CoreConfig.EolStreamType;
  45. import org.eclipse.jgit.lib.FileMode;
  46. import org.eclipse.jgit.lib.NullProgressMonitor;
  47. import org.eclipse.jgit.lib.ObjectId;
  48. import org.eclipse.jgit.lib.ObjectReader;
  49. import org.eclipse.jgit.lib.ProgressMonitor;
  50. import org.eclipse.jgit.lib.Ref;
  51. import org.eclipse.jgit.lib.RefUpdate;
  52. import org.eclipse.jgit.lib.RefUpdate.Result;
  53. import org.eclipse.jgit.lib.Repository;
  54. import org.eclipse.jgit.revwalk.RevCommit;
  55. import org.eclipse.jgit.revwalk.RevTree;
  56. import org.eclipse.jgit.revwalk.RevWalk;
  57. import org.eclipse.jgit.treewalk.TreeWalk;
  58. import org.eclipse.jgit.treewalk.filter.PathFilterGroup;

  60. /**
  61.  * Checkout a branch to the working tree.
  62.  * <p>
  63.  * Examples (<code>git</code> is a {@link org.eclipse.jgit.api.Git} instance):
  64.  * <p>
  65.  * Check out an existing branch:
  66.  *
  67.  * <pre>
  68.  * git.checkout().setName(&quot;feature&quot;).call();
  69.  * </pre>
  70.  * <p>
  71.  * Check out paths from the index:
  72.  *
  73.  * <pre>
  74.  * git.checkout().addPath(&quot;file1.txt&quot;).addPath(&quot;file2.txt&quot;).call();
  75.  * </pre>
  76.  * <p>
  77.  * Check out a path from a commit:
  78.  *
  79.  * <pre>
  80.  * git.checkout().setStartPoint(&quot;HEAD&circ;&quot;).addPath(&quot;file1.txt&quot;).call();
  81.  * </pre>
  82.  *
  83.  * <p>
  84.  * Create a new branch and check it out:
  85.  *
  86.  * <pre>
  87.  * git.checkout().setCreateBranch(true).setName(&quot;newbranch&quot;).call();
  88.  * </pre>
  89.  * <p>
  90.  * Create a new tracking branch for a remote branch and check it out:
  91.  *
  92.  * <pre>
  93.  * git.checkout().setCreateBranch(true).setName(&quot;stable&quot;)
  94.  *      .setUpstreamMode(SetupUpstreamMode.SET_UPSTREAM)
  95.  *      .setStartPoint(&quot;origin/stable&quot;).call();
  96.  * </pre>
  97.  *
  98.  * @see <a href=
  99.  *      "http://www.kernel.org/pub/software/scm/git/docs/git-checkout.html" >Git
  100.  *      documentation about Checkout</a>
  101.  */
  102. public class CheckoutCommand extends GitCommand<Ref> {

  104.     /**
  105.      * Stage to check out, see {@link CheckoutCommand#setStage(Stage)}.
  106.      */
  107.     public enum Stage {
  108.         /**
  109.          * Base stage (#1)
  110.          */
  111.         BASE(DirCacheEntry.STAGE_1),

  113.         /**
  114.          * Ours stage (#2)
  115.          */
  116.         OURS(DirCacheEntry.STAGE_2),

  118.         /**
  119.          * Theirs stage (#3)
  120.          */
  121.         THEIRS(DirCacheEntry.STAGE_3);

  123.         private final int number;

  125.         private Stage(int number) {
  126.             this.number = number;
  127.         }
  128.     }

  130.     private String name;

  132.     private boolean forceRefUpdate = false;

  134.     private boolean forced = false;

  136.     private boolean createBranch = false;

  138.     private boolean orphan = false;

  140.     private CreateBranchCommand.SetupUpstreamMode upstreamMode;

  142.     private String startPoint = null;

  144.     private RevCommit startCommit;

  146.     private Stage checkoutStage = null;

  148.     private CheckoutResult status;

  150.     private List<String> paths;

  152.     private boolean checkoutAllPaths;

  154.     private Set<String> actuallyModifiedPaths;

  156.     private ProgressMonitor monitor = NullProgressMonitor.INSTANCE;

  158.     /**
  159.      * Constructor for CheckoutCommand
  160.      *
  161.      * @param repo
  162.      *            the {@link org.eclipse.jgit.lib.Repository}
  163.      */
  164.     protected CheckoutCommand(Repository repo) {
  165.         super(repo);
  166.         this.paths = new LinkedList<>();
  167.     }

  169.     /** {@inheritDoc} */
  170.     @Override
  171.     public Ref call() throws GitAPIException, RefAlreadyExistsException,
  172.             RefNotFoundException, InvalidRefNameException,
  173.             CheckoutConflictException {
  174.         checkCallable();
  175.         try {
  176.             processOptions();
  177.             if (checkoutAllPaths || !paths.isEmpty()) {
  178.                 checkoutPaths();
  179.                 status = new CheckoutResult(Status.OK, paths);
  180.                 setCallable(false);
  181.                 return null;
  182.             }

  184.             if (createBranch) {
  185.                 try (Git git = new Git(repo)) {
  186.                     CreateBranchCommand command = git.branchCreate();
  187.                     command.setName(name);
  188.                     if (startCommit != null)
  189.                         command.setStartPoint(startCommit);
  190.                     else
  191.                         command.setStartPoint(startPoint);
  192.                     if (upstreamMode != null)
  193.                         command.setUpstreamMode(upstreamMode);
  194.                     command.call();
  195.                 }
  196.             }

  198.             Ref headRef = repo.exactRef(Constants.HEAD);
  199.             if (headRef == null) {
  200.                 // TODO Git CLI supports checkout from unborn branch, we should
  201.                 // also allow this
  202.                 throw new UnsupportedOperationException(
  203.                         JGitText.get().cannotCheckoutFromUnbornBranch);
  204.             }
  205.             String shortHeadRef = getShortBranchName(headRef);
  206.             String refLogMessage = "checkout: moving from " + shortHeadRef; //$NON-NLS-1$
  207.             ObjectId branch;
  208.             if (orphan) {
  209.                 if (startPoint == null && startCommit == null) {
  210.                     Result r = repo.updateRef(Constants.HEAD).link(
  211.                             getBranchName());
  212.                     if (!EnumSet.of(Result.NEW, Result.FORCED).contains(r))
  213.                         throw new JGitInternalException(MessageFormat.format(
  214.                                 JGitText.get().checkoutUnexpectedResult,
  215.                                 r.name()));
  216.                     this.status = CheckoutResult.NOT_TRIED_RESULT;
  217.                     return repo.exactRef(Constants.HEAD);
  218.                 }
  219.                 branch = getStartPointObjectId();
  220.             } else {
  221.                 branch = repo.resolve(name);
  222.                 if (branch == null)
  223.                     throw new RefNotFoundException(MessageFormat.format(
  224.                             JGitText.get().refNotResolved, name));
  225.             }

  227.             RevCommit headCommit = null;
  228.             RevCommit newCommit = null;
  229.             try (RevWalk revWalk = new RevWalk(repo)) {
  230.                 AnyObjectId headId = headRef.getObjectId();
  231.                 headCommit = headId == null ? null
  232.                         : revWalk.parseCommit(headId);
  233.                 newCommit = revWalk.parseCommit(branch);
  234.             }
  235.             RevTree headTree = headCommit == null ? null : headCommit.getTree();
  236.             DirCacheCheckout dco;
  237.             DirCache dc = repo.lockDirCache();
  238.             try {
  239.                 dco = new DirCacheCheckout(repo, headTree, dc,
  240.                         newCommit.getTree());
  241.                 dco.setFailOnConflict(true);
  242.                 dco.setForce(forced);
  243.                 if (forced) {
  244.                     dco.setFailOnConflict(false);
  245.                 }
  246.                 dco.setProgressMonitor(monitor);
  247.                 try {
  248.                     dco.checkout();
  249.                 } catch (org.eclipse.jgit.errors.CheckoutConflictException e) {
  250.                     status = new CheckoutResult(Status.CONFLICTS,
  251.                             dco.getConflicts());
  252.                     throw new CheckoutConflictException(dco.getConflicts(), e);
  253.                 }
  254.             } finally {
  255.                 dc.unlock();
  256.             }
  257.             Ref ref = repo.findRef(name);
  258.             if (ref != null && !ref.getName().startsWith(Constants.R_HEADS))
  259.                 ref = null;
  260.             String toName = Repository.shortenRefName(name);
  261.             RefUpdate refUpdate = repo.updateRef(Constants.HEAD, ref == null);
  262.             refUpdate.setForceUpdate(forceRefUpdate);
  263.             refUpdate.setRefLogMessage(refLogMessage + " to " + toName, false); //$NON-NLS-1$
  264.             Result updateResult;
  265.             if (ref != null)
  266.                 updateResult = refUpdate.link(ref.getName());
  267.             else if (orphan) {
  268.                 updateResult = refUpdate.link(getBranchName());
  269.                 ref = repo.exactRef(Constants.HEAD);
  270.             } else {
  271.                 refUpdate.setNewObjectId(newCommit);
  272.                 updateResult = refUpdate.forceUpdate();
  273.             }

  275.             setCallable(false);

  277.             boolean ok = false;
  278.             switch (updateResult) {
  279.             case NEW:
  280.                 ok = true;
  281.                 break;
  282.             case NO_CHANGE:
  283.             case FAST_FORWARD:
  284.             case FORCED:
  285.                 ok = true;
  286.                 break;
  287.             default:
  288.                 break;
  289.             }

  291.             if (!ok)
  292.                 throw new JGitInternalException(MessageFormat.format(JGitText
  293.                         .get().checkoutUnexpectedResult, updateResult.name()));


  296.             if (!dco.getToBeDeleted().isEmpty()) {
  297.                 status = new CheckoutResult(Status.NONDELETED,
  298.                         dco.getToBeDeleted(),
  299.                         new ArrayList<>(dco.getUpdated().keySet()),
  300.                         dco.getRemoved());
  301.             } else
  302.                 status = new CheckoutResult(new ArrayList<>(dco
  303.                         .getUpdated().keySet()), dco.getRemoved());

  305.             return ref;
  306.         } catch (IOException ioe) {
  307.             throw new JGitInternalException(ioe.getMessage(), ioe);
  308.         } finally {
  309.             if (status == null)
  310.                 status = CheckoutResult.ERROR_RESULT;
  311.         }
  312.     }

  314.     private String getShortBranchName(Ref headRef) {
  315.         if (headRef.isSymbolic()) {
  316.             return Repository.shortenRefName(headRef.getTarget().getName());
  317.         }
  318.         // Detached HEAD. Every non-symbolic ref in the ref database has an
  319.         // object id, so this cannot be null.
  320.         ObjectId id = headRef.getObjectId();
  321.         if (id == null) {
  322.             throw new NullPointerException();
  323.         }
  324.         return id.getName();
  325.     }

  327.     /**
  328.      * @param monitor
  329.      *            a progress monitor
  330.      * @return this instance
  331.      * @since 4.11
  332.      */
  333.     public CheckoutCommand setProgressMonitor(ProgressMonitor monitor) {
  334.         if (monitor == null) {
  335.             monitor = NullProgressMonitor.INSTANCE;
  336.         }
  337.         this.monitor = monitor;
  338.         return this;
  339.     }

  341.     /**
  342.      * Add a single slash-separated path to the list of paths to check out. To
  343.      * check out all paths, use {@link #setAllPaths(boolean)}.
  344.      * <p>
  345.      * If this option is set, neither the {@link #setCreateBranch(boolean)} nor
  346.      * {@link #setName(String)} option is considered. In other words, these
  347.      * options are exclusive.
  348.      *
  349.      * @param path
  350.      *            path to update in the working tree and index (with
  351.      *            <code>/</code> as separator)
  352.      * @return {@code this}
  353.      */
  354.     public CheckoutCommand addPath(String path) {
  355.         checkCallable();
  356.         this.paths.add(path);
  357.         return this;
  358.     }

  360.     /**
  361.      * Add multiple slash-separated paths to the list of paths to check out. To
  362.      * check out all paths, use {@link #setAllPaths(boolean)}.
  363.      * <p>
  364.      * If this option is set, neither the {@link #setCreateBranch(boolean)} nor
  365.      * {@link #setName(String)} option is considered. In other words, these
  366.      * options are exclusive.
  367.      *
  368.      * @param p
  369.      *            paths to update in the working tree and index (with
  370.      *            <code>/</code> as separator)
  371.      * @return {@code this}
  372.      * @since 4.6
  373.      */
  374.     public CheckoutCommand addPaths(List<String> p) {
  375.         checkCallable();
  376.         this.paths.addAll(p);
  377.         return this;
  378.     }

  380.     /**
  381.      * Set whether to checkout all paths.
  382.      * <p>
  383.      * This options should be used when you want to do a path checkout on the
  384.      * entire repository and so calling {@link #addPath(String)} is not possible
  385.      * since empty paths are not allowed.
  386.      * <p>
  387.      * If this option is set, neither the {@link #setCreateBranch(boolean)} nor
  388.      * {@link #setName(String)} option is considered. In other words, these
  389.      * options are exclusive.
  390.      *
  391.      * @param all
  392.      *            <code>true</code> to checkout all paths, <code>false</code>
  393.      *            otherwise
  394.      * @return {@code this}
  395.      * @since 2.0
  396.      */
  397.     public CheckoutCommand setAllPaths(boolean all) {
  398.         checkoutAllPaths = all;
  399.         return this;
  400.     }

  402.     /**
  403.      * Checkout paths into index and working directory, firing a
  404.      * {@link org.eclipse.jgit.events.WorkingTreeModifiedEvent} if the working
  405.      * tree was modified.
  406.      *
  407.      * @return this instance
  408.      * @throws java.io.IOException
  409.      * @throws org.eclipse.jgit.api.errors.RefNotFoundException
  410.      */
  411.     protected CheckoutCommand checkoutPaths() throws IOException,
  412.             RefNotFoundException {
  413.         actuallyModifiedPaths = new HashSet<>();
  414.         DirCache dc = repo.lockDirCache();
  415.         try (RevWalk revWalk = new RevWalk(repo);
  416.                 TreeWalk treeWalk = new TreeWalk(repo,
  417.                         revWalk.getObjectReader())) {
  418.             treeWalk.setRecursive(true);
  419.             if (!checkoutAllPaths)
  420.                 treeWalk.setFilter(PathFilterGroup.createFromStrings(paths));
  421.             if (isCheckoutIndex())
  422.                 checkoutPathsFromIndex(treeWalk, dc);
  423.             else {
  424.                 RevCommit commit = revWalk.parseCommit(getStartPointObjectId());
  425.                 checkoutPathsFromCommit(treeWalk, dc, commit);
  426.             }
  427.         } finally {
  428.             try {
  429.                 dc.unlock();
  430.             } finally {
  431.                 WorkingTreeModifiedEvent event = new WorkingTreeModifiedEvent(
  432.                         actuallyModifiedPaths, null);
  433.                 actuallyModifiedPaths = null;
  434.                 if (!event.isEmpty()) {
  435.                     repo.fireEvent(event);
  436.                 }
  437.             }
  438.         }
  439.         return this;
  440.     }

  442.     private void checkoutPathsFromIndex(TreeWalk treeWalk, DirCache dc)
  443.             throws IOException {
  444.         DirCacheIterator dci = new DirCacheIterator(dc);
  445.         treeWalk.addTree(dci);

  447.         String previousPath = null;

  449.         final ObjectReader r = treeWalk.getObjectReader();
  450.         DirCacheEditor editor = dc.editor();
  451.         while (treeWalk.next()) {
  452.             String path = treeWalk.getPathString();
  453.             // Only add one edit per path
  454.             if (path.equals(previousPath))
  455.                 continue;

  457.             final EolStreamType eolStreamType = treeWalk
  458.                     .getEolStreamType(CHECKOUT_OP);
  459.             final String filterCommand = treeWalk
  460.                     .getFilterCommand(Constants.ATTR_FILTER_TYPE_SMUDGE);
  461.             editor.add(new PathEdit(path) {
  462.                 @Override
  463.                 public void apply(DirCacheEntry ent) {
  464.                     int stage = ent.getStage();
  465.                     if (stage > DirCacheEntry.STAGE_0) {
  466.                         if (checkoutStage != null) {
  467.                             if (stage == checkoutStage.number) {
  468.                                 checkoutPath(ent, r, new CheckoutMetadata(
  469.                                         eolStreamType, filterCommand));
  470.                                 actuallyModifiedPaths.add(path);
  471.                             }
  472.                         } else {
  473.                             UnmergedPathException e = new UnmergedPathException(
  474.                                     ent);
  475.                             throw new JGitInternalException(e.getMessage(), e);
  476.                         }
  477.                     } else {
  478.                         checkoutPath(ent, r, new CheckoutMetadata(eolStreamType,
  479.                                 filterCommand));
  480.                         actuallyModifiedPaths.add(path);
  481.                     }
  482.                 }
  483.             });

  485.             previousPath = path;
  486.         }
  487.         editor.commit();
  488.     }

  490.     private void checkoutPathsFromCommit(TreeWalk treeWalk, DirCache dc,
  491.             RevCommit commit) throws IOException {
  492.         treeWalk.addTree(commit.getTree());
  493.         final ObjectReader r = treeWalk.getObjectReader();
  494.         DirCacheEditor editor = dc.editor();
  495.         while (treeWalk.next()) {
  496.             final ObjectId blobId = treeWalk.getObjectId(0);
  497.             final FileMode mode = treeWalk.getFileMode(0);
  498.             final EolStreamType eolStreamType = treeWalk
  499.                     .getEolStreamType(CHECKOUT_OP);
  500.             final String filterCommand = treeWalk
  501.                     .getFilterCommand(Constants.ATTR_FILTER_TYPE_SMUDGE);
  502.             final String path = treeWalk.getPathString();
  503.             editor.add(new PathEdit(path) {
  504.                 @Override
  505.                 public void apply(DirCacheEntry ent) {
  506.                     ent.setObjectId(blobId);
  507.                     ent.setFileMode(mode);
  508.                     checkoutPath(ent, r,
  509.                             new CheckoutMetadata(eolStreamType, filterCommand));
  510.                     actuallyModifiedPaths.add(path);
  511.                 }
  512.             });
  513.         }
  514.         editor.commit();
  515.     }

  517.     private void checkoutPath(DirCacheEntry entry, ObjectReader reader,
  518.             CheckoutMetadata checkoutMetadata) {
  519.         try {
  520.             DirCacheCheckout.checkoutEntry(repo, entry, reader, true,
  521.                     checkoutMetadata);
  522.         } catch (IOException e) {
  523.             throw new JGitInternalException(MessageFormat.format(
  524.                     JGitText.get().checkoutConflictWithFile,
  525.                     entry.getPathString()), e);
  526.         }
  527.     }

  529.     private boolean isCheckoutIndex() {
  530.         return startCommit == null && startPoint == null;
  531.     }

  533.     private ObjectId getStartPointObjectId() throws AmbiguousObjectException,
  534.             RefNotFoundException, IOException {
  535.         if (startCommit != null)
  536.             return startCommit.getId();

  538.         String startPointOrHead = (startPoint != null) ? startPoint
  539.                 : Constants.HEAD;
  540.         ObjectId result = repo.resolve(startPointOrHead);
  541.         if (result == null)
  542.             throw new RefNotFoundException(MessageFormat.format(
  543.                     JGitText.get().refNotResolved, startPointOrHead));
  544.         return result;
  545.     }

  547.     private void processOptions() throws InvalidRefNameException,
  548.             RefAlreadyExistsException, IOException {
  549.         if (((!checkoutAllPaths && paths.isEmpty()) || orphan)
  550.                 && (name == null || !Repository
  551.                         .isValidRefName(Constants.R_HEADS + name)))
  552.             throw new InvalidRefNameException(MessageFormat.format(JGitText
  553.                     .get().branchNameInvalid, name == null ? "<null>" : name)); //$NON-NLS-1$

  555.         if (orphan) {
  556.             Ref refToCheck = repo.exactRef(getBranchName());
  557.             if (refToCheck != null)
  558.                 throw new RefAlreadyExistsException(MessageFormat.format(
  559.                         JGitText.get().refAlreadyExists, name));
  560.         }
  561.     }

  563.     private String getBranchName() {
  564.         if (name.startsWith(Constants.R_REFS))
  565.             return name;

  567.         return Constants.R_HEADS + name;
  568.     }

  570.     /**
  571.      * Specify the name of the branch or commit to check out, or the new branch
  572.      * name.
  573.      * <p>
  574.      * When only checking out paths and not switching branches, use
  575.      * {@link #setStartPoint(String)} or {@link #setStartPoint(RevCommit)} to
  576.      * specify from which branch or commit to check out files.
  577.      * <p>
  578.      * When {@link #setCreateBranch(boolean)} is set to <code>true</code>, use
  579.      * this method to set the name of the new branch to create and
  580.      * {@link #setStartPoint(String)} or {@link #setStartPoint(RevCommit)} to
  581.      * specify the start point of the branch.
  582.      *
  583.      * @param name
  584.      *            the name of the branch or commit
  585.      * @return this instance
  586.      */
  587.     public CheckoutCommand setName(String name) {
  588.         checkCallable();
  589.         this.name = name;
  590.         return this;
  591.     }

  593.     /**
  594.      * Specify whether to create a new branch.
  595.      * <p>
  596.      * If <code>true</code> is used, the name of the new branch must be set
  597.      * using {@link #setName(String)}. The commit at which to start the new
  598.      * branch can be set using {@link #setStartPoint(String)} or
  599.      * {@link #setStartPoint(RevCommit)}; if not specified, HEAD is used. Also
  600.      * see {@link #setUpstreamMode} for setting up branch tracking.
  601.      *
  602.      * @param createBranch
  603.      *            if <code>true</code> a branch will be created as part of the
  604.      *            checkout and set to the specified start point
  605.      * @return this instance
  606.      */
  607.     public CheckoutCommand setCreateBranch(boolean createBranch) {
  608.         checkCallable();
  609.         this.createBranch = createBranch;
  610.         return this;
  611.     }

  613.     /**
  614.      * Specify whether to create a new orphan branch.
  615.      * <p>
  616.      * If <code>true</code> is used, the name of the new orphan branch must be
  617.      * set using {@link #setName(String)}. The commit at which to start the new
  618.      * orphan branch can be set using {@link #setStartPoint(String)} or
  619.      * {@link #setStartPoint(RevCommit)}; if not specified, HEAD is used.
  620.      *
  621.      * @param orphan
  622.      *            if <code>true</code> a orphan branch will be created as part
  623.      *            of the checkout to the specified start point
  624.      * @return this instance
  625.      * @since 3.3
  626.      */
  627.     public CheckoutCommand setOrphan(boolean orphan) {
  628.         checkCallable();
  629.         this.orphan = orphan;
  630.         return this;
  631.     }

  633.     /**
  634.      * Specify to force the ref update in case of a branch switch.
  635.      *
  636.      * @param force
  637.      *            if <code>true</code> and the branch with the given name
  638.      *            already exists, the start-point of an existing branch will be
  639.      *            set to a new start-point; if false, the existing branch will
  640.      *            not be changed
  641.      * @return this instance
  642.      * @deprecated this method was badly named comparing its semantics to native
  643.      *             git's checkout --force option, use
  644.      *             {@link #setForceRefUpdate(boolean)} instead
  645.      */
  646.     @Deprecated
  647.     public CheckoutCommand setForce(boolean force) {
  648.         return setForceRefUpdate(force);
  649.     }

  651.     /**
  652.      * Specify to force the ref update in case of a branch switch.
  653.      *
  654.      * In releases prior to 5.2 this method was called setForce() but this name
  655.      * was misunderstood to implement native git's --force option, which is not
  656.      * true.
  657.      *
  658.      * @param forceRefUpdate
  659.      *            if <code>true</code> and the branch with the given name
  660.      *            already exists, the start-point of an existing branch will be
  661.      *            set to a new start-point; if false, the existing branch will
  662.      *            not be changed
  663.      * @return this instance
  664.      * @since 5.3
  665.      */
  666.     public CheckoutCommand setForceRefUpdate(boolean forceRefUpdate) {
  667.         checkCallable();
  668.         this.forceRefUpdate = forceRefUpdate;
  669.         return this;
  670.     }

  672.     /**
  673.      * Allow a checkout even if the workingtree or index differs from HEAD. This
  674.      * matches native git's '--force' option.
  675.      *
  676.      * JGit releases before 5.2 had a method <code>setForce()</code> offering
  677.      * semantics different from this new <code>setForced()</code>. This old
  678.      * semantic can now be found in {@link #setForceRefUpdate(boolean)}
  679.      *
  680.      * @param forced
  681.      *            if set to <code>true</code> then allow the checkout even if
  682.      *            workingtree or index doesn't match HEAD. Overwrite workingtree
  683.      *            files and index content with the new content in this case.
  684.      * @return this instance
  685.      * @since 5.3
  686.      */
  687.     public CheckoutCommand setForced(boolean forced) {
  688.         checkCallable();
  689.         this.forced = forced;
  690.         return this;
  691.     }

  693.     /**
  694.      * Set the name of the commit that should be checked out.
  695.      * <p>
  696.      * When checking out files and this is not specified or <code>null</code>,
  697.      * the index is used.
  698.      * <p>
  699.      * When creating a new branch, this will be used as the start point. If not
  700.      * specified or <code>null</code>, the current HEAD is used.
  701.      *
  702.      * @param startPoint
  703.      *            commit name to check out
  704.      * @return this instance
  705.      */
  706.     public CheckoutCommand setStartPoint(String startPoint) {
  707.         checkCallable();
  708.         this.startPoint = startPoint;
  709.         this.startCommit = null;
  710.         checkOptions();
  711.         return this;
  712.     }

  714.     /**
  715.      * Set the commit that should be checked out.
  716.      * <p>
  717.      * When creating a new branch, this will be used as the start point. If not
  718.      * specified or <code>null</code>, the current HEAD is used.
  719.      * <p>
  720.      * When checking out files and this is not specified or <code>null</code>,
  721.      * the index is used.
  722.      *
  723.      * @param startCommit
  724.      *            commit to check out
  725.      * @return this instance
  726.      */
  727.     public CheckoutCommand setStartPoint(RevCommit startCommit) {
  728.         checkCallable();
  729.         this.startCommit = startCommit;
  730.         this.startPoint = null;
  731.         checkOptions();
  732.         return this;
  733.     }

  735.     /**
  736.      * When creating a branch with {@link #setCreateBranch(boolean)}, this can
  737.      * be used to configure branch tracking.
  738.      *
  739.      * @param mode
  740.      *            corresponds to the --track/--no-track options; may be
  741.      *            <code>null</code>
  742.      * @return this instance
  743.      */
  744.     public CheckoutCommand setUpstreamMode(
  745.             CreateBranchCommand.SetupUpstreamMode mode) {
  746.         checkCallable();
  747.         this.upstreamMode = mode;
  748.         return this;
  749.     }

  751.     /**
  752.      * When checking out the index, check out the specified stage (ours or
  753.      * theirs) for unmerged paths.
  754.      * <p>
  755.      * This can not be used when checking out a branch, only when checking out
  756.      * the index.
  757.      *
  758.      * @param stage
  759.      *            the stage to check out
  760.      * @return this
  761.      */
  762.     public CheckoutCommand setStage(Stage stage) {
  763.         checkCallable();
  764.         this.checkoutStage = stage;
  765.         checkOptions();
  766.         return this;
  767.     }

  769.     /**
  770.      * Get the result, never <code>null</code>
  771.      *
  772.      * @return the result, never <code>null</code>
  773.      */
  774.     public CheckoutResult getResult() {
  775.         if (status == null)
  776.             return CheckoutResult.NOT_TRIED_RESULT;
  777.         return status;
  778.     }

  780.     private void checkOptions() {
  781.         if (checkoutStage != null && !isCheckoutIndex())
  782.             throw new IllegalStateException(
  783.                     JGitText.get().cannotCheckoutOursSwitchBranch);
  784.     }
  785. }
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