From 944b4b105ce834b61f3eabe1f221be7aec458ca0 Mon Sep 17 00:00:00 2001
From: Pinghao Wu <xdavidwuph@gmail.com>
Date: Fri, 1 Nov 2024 16:01:35 +0800
Subject: [PATCH] CephFSDocumentsProvider: cheaper getDocumentType

---
 .../org/safcephfs/CephFSDocumentsProvider.java    | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/main/java/org/safcephfs/CephFSDocumentsProvider.java b/src/main/java/org/safcephfs/CephFSDocumentsProvider.java
index 2a0afab..307453c 100644
--- a/src/main/java/org/safcephfs/CephFSDocumentsProvider.java
+++ b/src/main/java/org/safcephfs/CephFSDocumentsProvider.java
@@ -443,6 +443,21 @@ public class CephFSDocumentsProvider extends DocumentsProvider {
 		return result;
 	}
 
+	// default implementation query without projection, which is costly
+	// TODO try to upstream the idea?
+	public String getDocumentType(String documentId)
+			throws FileNotFoundException {
+		try (var c = new UncheckedAutoCloseable<Cursor>(queryDocument(
+				documentId, new String[]{Document.COLUMN_MIME_TYPE}))) {
+			if (c.c().moveToFirst()) {
+				return c.c().getString(
+					c.c().getColumnIndexOrThrow(Document.COLUMN_MIME_TYPE));
+			} else {
+				return null;
+			}
+		}
+	}
+
 	private long getXattrULL(String path, String name)
 			throws FileNotFoundException {
 		var buf = new byte[32];
-- 
2.45.2