From 58ef4d9a95584fb89ebcf6222fbac6e698aa6b0b Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Wed, 11 Jul 2012 11:08:47 -0400
Subject: Add a function queryValidPaths()

queryValidPaths() combines multiple calls to isValidPath() in one.
This matters when using the Nix daemon because it reduces latency.
For instance, on "nix-env -qas \*" it reduces execution time from 5.7s
to 4.7s (which is indistinguishable from the non-daemon case).
---
 src/libstore/local-store.cc | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'src/libstore/local-store.cc')

diff --git a/src/libstore/local-store.cc b/src/libstore/local-store.cc
index 89c5279b1..e3d23fdfb 100644
--- a/src/libstore/local-store.cc
+++ b/src/libstore/local-store.cc
@@ -744,6 +744,15 @@ bool LocalStore::isValidPath(const Path & path)
 }
 
 
+PathSet LocalStore::queryValidPaths(const PathSet & paths)
+{
+    PathSet res;
+    foreach (PathSet::const_iterator, i, paths)
+        if (isValidPath(*i)) res.insert(*i);
+    return res;
+}
+
+
 PathSet LocalStore::queryAllValidPaths()
 {
     SQLiteStmt stmt;
-- 
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