TarLayoutWriter Class — spring-boot Architecture

Source Code

buildpack/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/io/TarLayoutWriter.java lines 35–86

class TarLayoutWriter implements Layout, Closeable {

	static final long NORMALIZED_MOD_TIME = TarArchive.NORMALIZED_TIME.toEpochMilli();

	private final TarArchiveOutputStream outputStream;

	TarLayoutWriter(OutputStream outputStream) {
		this.outputStream = new TarArchiveOutputStream(outputStream);
		this.outputStream.setLongFileMode(TarArchiveOutputStream.LONGFILE_POSIX);
	}

	@Override
	public void directory(String name, Owner owner, int mode) throws IOException {
		this.outputStream.putArchiveEntry(createDirectoryEntry(name, owner, mode));
		this.outputStream.closeArchiveEntry();
	}

	@Override
	public void file(String name, Owner owner, int mode, Content content) throws IOException {
		this.outputStream.putArchiveEntry(createFileEntry(name, owner, mode, content.size()));
		content.writeTo(StreamUtils.nonClosing(this.outputStream));
		this.outputStream.closeArchiveEntry();
	}

	private TarArchiveEntry createDirectoryEntry(String name, Owner owner, int mode) {
		return createEntry(name, owner, TarConstants.LF_DIR, mode, 0);
	}

	private TarArchiveEntry createFileEntry(String name, Owner owner, int mode, int size) {
		return createEntry(name, owner, TarConstants.LF_NORMAL, mode, size);
	}

	private TarArchiveEntry createEntry(String name, Owner owner, byte linkFlag, int mode, int size) {
		TarArchiveEntry entry = new TarArchiveEntry(name, linkFlag, true);
		entry.setUserId(owner.getUid());
		entry.setGroupId(owner.getGid());
		entry.setMode(mode);
		entry.setModTime(NORMALIZED_MOD_TIME);
		entry.setSize(size);
		return entry;
	}

	void finish() throws IOException {
		this.outputStream.finish();
	}

	@Override
	public void close() throws IOException {
		this.outputStream.close();
	}

}