This Java code defines a method named `copyFileToOutputStream` that takes...

March 27, 2023 at 06:41 AM

public void copyFileToOutputStream(Repository repository, String filePath, OutputStream os) throws Exception { try (TreeWalk treeWalk = new TreeWalk(repository)) { RevCommit revCommit = repository.parseCommit(repository.resolve("origin/head")) treeWalk.addTree(revCommit.getTree()); treeWalk.setRecursive(true); treeWalk.setFilter(PathFilter.create(filePath)); if (!treeWalk.next()) { throw new IllegalStateException("Did not find expected file '" + filePath + "'"); } final ObjectId objectId = treeWalk.getObjectId(0); final ObjectLoader loader = repository.open(objectId); loader.copyTo(os); } }

This Java code defines a method named copyFileToOutputStream that takes three arguments: a Repository instance, a String representing the path of the file to copy, and an OutputStream to write the contents of the file to.

The method first creates a new TreeWalk instance using the given repository, which is used to traverse the Git tree objects. It then retrieves the latest commit on the remote "origin/head" branch from the repository and adds its associated tree object to the TreeWalk. The PathFilter is set to only include the specified filePath. If the file is not found, the method throws an exception.

Once the file has been located in the Git tree, the method obtains its ObjectId and retrieves it using repository.open, returning an ObjectLoader instance to access the file's contents. Finally, the file contents are written to the given OutputStream.

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