From 0993b354e55133986d7bb0372ffe21d3a4b76c33 Mon Sep 17 00:00:00 2001
From: Syrone Wong <wong.syrone@gmail.com>
Date: Fri, 3 Dec 2021 08:33:46 +0800
Subject: [PATCH] ConfigParser: do NOT override existing sections

This commit support format as below:

```
[DNS]
EQUAL,example.com

[URL]
PREFIX,https://example.com/a

[URL]
PREFIX,https://example.com/foo

[URL]
PREFIX,https://example.com/bar
```

It merges sections with the same section name.
---
 .../io/zhile/research/ja/netfilter/commons/ConfigParser.java | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/main/java/io/zhile/research/ja/netfilter/commons/ConfigParser.java b/src/main/java/io/zhile/research/ja/netfilter/commons/ConfigParser.java
index 9ea4b3d..fdc6ff3 100644
--- a/src/main/java/io/zhile/research/ja/netfilter/commons/ConfigParser.java
+++ b/src/main/java/io/zhile/research/ja/netfilter/commons/ConfigParser.java
@@ -45,7 +45,10 @@ public class ConfigParser {
                         }
 
                         lastSection = section;
-                        map.put(lastSection, new ArrayList<>());
+                        if (null == map.get(lastSection)) {
+                            // do NOT override existing sections
+                            map.put(lastSection, new ArrayList<>());
+                        }
                         break;
                     case '#':
                     case ';':