From 2e7014293430ee42aa25b5edbedb14d9412a92d0 Mon Sep 17 00:00:00 2001
From: Steve Bjorg <steve.bjorg@gmail.com>
Date: Thu, 30 Jul 2015 10:43:53 -0700
Subject: [PATCH] Copied over methods from Deki that should be available in
 DReAM instead.

---
 .../Collections/Generic/DictionaryUtil.cs     | 29 +++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/src/mindtouch.dream/system/Collections/Generic/DictionaryUtil.cs b/src/mindtouch.dream/system/Collections/Generic/DictionaryUtil.cs
index 4b0ce56..7eeca7d 100644
--- a/src/mindtouch.dream/system/Collections/Generic/DictionaryUtil.cs
+++ b/src/mindtouch.dream/system/Collections/Generic/DictionaryUtil.cs
@@ -39,5 +39,34 @@ public static Dictionary<K, V> ToDictionaryWithDuplicateErrorCallback<K, V, T>(t
             }
             return result;
         }
+
+        public static IEnumerable<TValue> CollectAllValues<TKey, TValue>(this IDictionary<TKey, ICollection<TValue>> dictionary, IEnumerable<TKey> keys, out IEnumerable<TKey> missing) {
+            var result = new List<TValue>();
+            var missingResult = new List<TKey>();
+            foreach(var key in keys) {
+                ICollection<TValue> value;
+                if(dictionary.TryGetValue(key, out value)) {
+                    result.AddRange(value);
+                } else {
+                    missingResult.Add(key);
+                }
+            }
+            missing = missingResult;
+            return result;
+        }
+
+        public static Dictionary<TKey, TValue> ToDictionary<TKey, TValue>(this IEnumerable<KeyValuePair<TKey, TValue>> source, bool overwriteDuplicates = false) {
+            var result = new Dictionary<TKey, TValue>();
+            if(overwriteDuplicates) {
+                foreach(var pair in source) {
+                    result[pair.Key] = pair.Value;
+                }
+            } else {
+                foreach(var pair in source) {
+                    result.Add(pair.Key, pair.Value);
+                }
+            }
+            return result;
+        } 
     }
 }