1 files changed, 56 insertions, 0 deletions
diff --git a/FireBase/Query/ChildQuery.cs b/FireBase/Query/ChildQuery.cs
new file mode 100644
index 0000000..1696ea8
--- /dev/null
+++ b/FireBase/Query/ChildQuery.cs
@@ -0,0 +1,56 @@
+namespace Firebase.Database.Query
+{
+    using System;
+    
+    /// <summary>
+    /// Firebase query which references the child of current node.
+    /// </summary>
+    public class ChildQuery : FirebaseQuery
+    {
+        private readonly Func<string> pathFactory;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ChildQuery"/> class.
+        /// </summary>
+        /// <param name="parent"> The parent.  </param>
+        /// <param name="pathFactory"> The path to the child node.  </param>
+        /// <param name="client"> The owner. </param>
+        public ChildQuery(FirebaseQuery parent, Func<string> pathFactory, FirebaseClient client)
+            : base(parent, client)
+        {
+            this.pathFactory = pathFactory;
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ChildQuery"/> class.
+        /// </summary>
+        /// <param name="client"> The client. </param>
+        /// <param name="pathFactory"> The path to the child node.  </param>
+        public ChildQuery(FirebaseClient client, Func<string> pathFactory)
+            : this(null, pathFactory, client)
+        {
+        }
+
+        /// <summary>
+        /// Build the url segment of this child.
+        /// </summary>
+        /// <param name="child"> The child of this child. </param>
+        /// <returns> The <see cref="string"/>. </returns>
+        protected override string BuildUrlSegment(FirebaseQuery child)
+        {
+            var s = this.pathFactory();
+
+            if (s != string.Empty && !s.EndsWith("/"))
+            {
+                s += '/';
+            }
+
+            if (!(child is ChildQuery))
+            {
+                return s + ".json";
+            }
+
+            return s;
+        }
+    }
+}