如何在STL中实现Stack？(How is Stack implemented in STL?)

 git merge --abort没有直接的等价物 - 在JGit中是不可用的。 这段代码可以作为一个起点： 
 
// clear the merge state
repository.writeMergeCommitMsg( null );
repository.writeMergeHeads( null );

// reset the index and work directory to HEAD
Git.wrap( repository ).reset().setMode( ResetType.HARD ).call();
 
 它清空合并状态文件，然后将索引和工作目录重置为当前HEAD提交的内容。 
 
 为了测试两个提交是否可以合并，您还可以使用内核合并 。 这将避免检查工作目录中的冲突提交，以便稍后重置它们。 
 
RevCommit parentCommit = mergeCommit.getParent( 0 );
revWalk.parseHeaders( parentCommit );

ResolveMerger merger = ( ResolveMerger )MergeStrategy.RESOLVE.newMerger( repository, true );
merger.setWorkingTreeIterator( new FileTreeIterator( repository ) );
merger.setBase( parentCommit.getTree() );
if( !merger.merge( headCommit, mergeCommit ) ) {
  if( merger.failed() {
    throw new IllegalStateException( "Should not happen with in-core mergers" );
  }
  // inspect merger.getMergeResults() for further details
}

There is no direct equivalent for git merge --abort in JGit. This code snippet may serve as a starting point:
 
// clear the merge state
repository.writeMergeCommitMsg( null );
repository.writeMergeHeads( null );

// reset the index and work directory to HEAD
Git.wrap( repository ).reset().setMode( ResetType.HARD ).call();
 
It empties the merge state files and then resets index and work directory to the contents of the current HEAD commit.
 
In order to test if two commits can be merged, you could also use an in-core merger. This would avoid checking out the conflicting commit into the work directory just to reset them later on.
 
RevCommit parentCommit = mergeCommit.getParent( 0 );
revWalk.parseHeaders( parentCommit );

ResolveMerger merger = ( ResolveMerger )MergeStrategy.RESOLVE.newMerger( repository, true );
merger.setWorkingTreeIterator( new FileTreeIterator( repository ) );
merger.setBase( parentCommit.getTree() );
if( !merger.merge( headCommit, mergeCommit ) ) {
  if( merger.failed() {
    throw new IllegalStateException( "Should not happen with in-core mergers" );
  }
  // inspect merger.getMergeResults() for further details
}