TT#4657 avp: add del(value)

Change-Id: I41309ffff4f1a9335911f7d48f6295ea123c7d25

ngcp/avp.lua

@@ -60,6 +60,17 @@ local NGCPAvp_MT = {
         sr.log(level, tostring(self))
     end
 
+    function NGCPAvp:del(value)
+        local values = self.all()
+        if not values or not value then return end
+        sr.pv.unset(self.id)
+        for i = #values, 1, -1 do
+            if values[i] ~= value then
+                self(values[i])
+            end
+        end
+    end
+
     function NGCPAvp:clean()
         sr.pv.unset(self.id)
     end

tests/ngcp_avp.lua

@@ -75,6 +75,28 @@ TestNGCPAvp = {} --class
         assertItemsEquals(self.avp:all(), okvals)
     end
 
+    function TestNGCPAvp:test_avp_del()
+        local vals = {1,2, {"3", 4}}
+        local okvals = {4, "3", 2, 1}
+
+        for i=1,#vals do
+            self.avp(vals[i])
+        end
+        assertItemsEquals(self.avp:all(), okvals)
+        self.avp:del(1)
+        assertItemsEquals(self.avp:all(), {4, "3", 2})
+        self.avp:del(4)
+        assertItemsEquals(self.avp:all(), {"3", 2})
+        self.avp:del(1)
+        assertItemsEquals(self.avp:all(), {"3", 2})
+        self.avp:del("3")
+        assertItemsEquals(self.avp:all(), {2})
+        self.avp:del(2)
+        assertNil(self.avp:all())
+        self.avp:del(nil)
+        assertNil(self.avp:all())
+    end
+
     function TestNGCPAvp:test_clean()
         self.avp(1)
         self.avp:clean()