From fc8cf0ed674cbb495df1baff34d4b832ca5fad3c Mon Sep 17 00:00:00 2001
From: David Orchard <if_coding@fastmail.com>
Date: Wed, 28 Jul 2021 22:52:15 -0700
Subject: Use LinkedHashMap in place of HashMap

---
 src/source.rs | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

(limited to 'src/source.rs')

diff --git a/src/source.rs b/src/source.rs
index 831e4c4..7d257d0 100644
--- a/src/source.rs
+++ b/src/source.rs
@@ -1,4 +1,4 @@
-use std::collections::HashMap;
+use linked_hash_map::LinkedHashMap;
 use std::fmt::Debug;
 use std::str::FromStr;
 
@@ -13,8 +13,8 @@ pub trait Source: Debug {
     fn clone_into_box(&self) -> Box<dyn Source + Send + Sync>;
 
     /// Collect all configuration properties available from this source and return
-    /// a HashMap.
-    fn collect(&self) -> Result<HashMap<String, Value>>;
+    /// a LinkedHashMap.
+    fn collect(&self) -> Result<LinkedHashMap<String, Value>>;
 
     /// Collects all configuration properties to a provided cache.
     fn collect_to(&self, cache: &mut Value) -> Result<()> {
@@ -55,8 +55,8 @@ pub trait AsyncSource: Debug + Sync {
     // Sync is supertrait due to https://docs.rs/async-trait/0.1.50/async_trait/index.html#dyn-traits
 
     /// Collects all configuration properties available from this source and return
-    /// a HashMap as an async operations.
-    async fn collect(&self) -> Result<HashMap<String, Value>>;
+    /// a LinkedHashMap as an async operations.
+    async fn collect(&self) -> Result<LinkedHashMap<String, Value>>;
 
     /// Collects all configuration properties to a provided cache.
     async fn collect_to(&self, cache: &mut Value) -> Result<()> {
@@ -86,8 +86,8 @@ impl Source for Vec<Box<dyn Source + Send + Sync>> {
         Box::new((*self).clone())
     }
 
-    fn collect(&self) -> Result<HashMap<String, Value>> {
-        let mut cache: Value = HashMap::<String, Value>::new().into();
+    fn collect(&self) -> Result<LinkedHashMap<String, Value>> {
+        let mut cache: Value = LinkedHashMap::<String, Value>::new().into();
 
         for source in self {
             source.collect_to(&mut cache)?;
@@ -106,8 +106,8 @@ impl Source for [Box<dyn Source + Send + Sync>] {
         Box::new(self.to_owned())
     }
 
-    fn collect(&self) -> Result<HashMap<String, Value>> {
-        let mut cache: Value = HashMap::<String, Value>::new().into();
+    fn collect(&self) -> Result<LinkedHashMap<String, Value>> {
+        let mut cache: Value = LinkedHashMap::<String, Value>::new().into();
 
         for source in self {
             source.collect_to(&mut cache)?;
@@ -131,8 +131,8 @@ where
         Box::new((*self).clone())
     }
 
-    fn collect(&self) -> Result<HashMap<String, Value>> {
-        let mut cache: Value = HashMap::<String, Value>::new().into();
+    fn collect(&self) -> Result<LinkedHashMap<String, Value>> {
+        let mut cache: Value = LinkedHashMap::<String, Value>::new().into();
 
         for source in self {
             source.collect_to(&mut cache)?;
-- 
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