Examples of org.eclipse.jgit.lib.RefUpdate.update()

org.eclipse.jgit.lib.RefUpdate.update()
Gracefully update the ref to the new value.
Merge test will be performed according to {@link #isForceUpdate()}.
This is the same as:
```
 return update(new RevWalk(getRepository())); 
```
@return the result status of the update. @throws IOException an unexpected IO error occurred while writing changes.

      updateRef.setRefLogMessage(refLogMessage, false);
      Result updateResult;
      if (exists && force)
        updateResult = updateRef.forceUpdate();
      else
        updateResult = updateRef.update();


      setCallable(false);


      boolean ok = false;
      switch (updateResult) {

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        RefUpdate refUpdate = repo
            .updateRef(head.getTarget().getName());
        refUpdate.setNewObjectId(objectId);
        refUpdate.setExpectedOldObjectId(null);
        refUpdate.setRefLogMessage("initial pull", false);
        if (refUpdate.update() != Result.NEW)
          throw new NoHeadException(
              JGitText.get().commitOnRepoWithoutHEADCurrentlyNotSupported);
        setCallable(false);
        return new MergeResult(srcCommit, srcCommit, new ObjectId[] {
            null, srcCommit }, MergeStatus.FAST_FORWARD,

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      ConcurrentRefUpdateException {
    RefUpdate refUpdate = repo.updateRef(Constants.HEAD);
    refUpdate.setNewObjectId(newHeadId);
    refUpdate.setRefLogMessage(refLogMessage.toString(), false);
    refUpdate.setExpectedOldObjectId(oldHeadID);
    Result rc = refUpdate.update();
    switch (rc) {
    case NEW:
    case FAST_FORWARD:
      return;
    case REJECTED:

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      case UPDATE_NONFASTFORWARD:
        ru.setForceUpdate(isAllowNonFastForwards());
        ru.setExpectedOldObjectId(cmd.getOldId());
        ru.setNewObjectId(cmd.getNewId());
        ru.setRefLogMessage("push", true);
        status(cmd, ru.update(walk));
        break;
      }
    } catch (IOException err) {
      cmd.setResult(Result.REJECTED_OTHER_REASON, MessageFormat.format(
          JGitText.get().lockError, err.getMessage()));

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        RefUpdate rup = repo.updateRef(headName);
        rup.setExpectedOldObjectId(oldCommit);
        rup.setNewObjectId(newCommit);
        rup.setRefLogMessage("Fast-foward from " + oldCommit.name()
            + " to " + newCommit.name(), false);
        Result res = rup.update(walk);
        switch (res) {
        case FAST_FORWARD:
        case NO_CHANGE:
        case FORCED:
          break;

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    if (notesCommit != null)
      refUpdate.setExpectedOldObjectId(notesCommit);
    else
      refUpdate.setExpectedOldObjectId(ObjectId.zeroId());
    refUpdate.setNewObjectId(commit);
    refUpdate.update(walk);
  }


  /**
   * @param notesRef
   *            the ref to read notes from. Note, the default value of

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        RefUpdate refUpdate = repo
            .updateRef(head.getTarget().getName());
        refUpdate.setNewObjectId(objectId);
        refUpdate.setExpectedOldObjectId(null);
        refUpdate.setRefLogMessage("initial pull", false);
        if (refUpdate.update() != Result.NEW)
          throw new NoHeadException(
              JGitText.get().commitOnRepoWithoutHEADCurrentlyNotSupported);
        setCallable(false);
        return new MergeResult(srcCommit, srcCommit, new ObjectId[] {
            null, srcCommit }, MergeStatus.FAST_FORWARD,

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      ConcurrentRefUpdateException {
    RefUpdate refUpdate = repo.updateRef(Constants.HEAD);
    refUpdate.setNewObjectId(newHeadId);
    refUpdate.setRefLogMessage(refLogMessage.toString(), false);
    refUpdate.setExpectedOldObjectId(oldHeadID);
    Result rc = refUpdate.update();
    switch (rc) {
    case NEW:
    case FAST_FORWARD:
      return;
    case REJECTED:

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      case UPDATE_NONFASTFORWARD:
        ru.setForceUpdate(isAllowNonFastForwards());
        ru.setExpectedOldObjectId(cmd.getOldId());
        ru.setNewObjectId(cmd.getNewId());
        ru.setRefLogMessage("push", true);
        status(cmd, ru.update(walk));
        break;
      }
    } catch (IOException err) {
      cmd.setResult(Result.REJECTED_OTHER_REASON, MessageFormat.format(
          JGitText.get().lockError, err.getMessage()));

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    if (notesCommit != null)
      refUpdate.setExpectedOldObjectId(notesCommit);
    else
      refUpdate.setExpectedOldObjectId(ObjectId.zeroId());
    refUpdate.setNewObjectId(commit);
    refUpdate.update(walk);
  }


  /**
   * @param notesRef
   *            the ref to read notes from. Note, the default value of

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