1 files changed, 35 insertions, 0 deletions
diff --git a/src/native/addrbook/AddrBookContactQuery.c b/src/native/addrbook/AddrBookContactQuery.c
index 1045214..415ce67 100644
--- a/src/native/addrbook/AddrBookContactQuery.c
+++ b/src/native/addrbook/AddrBookContactQuery.c
@@ -44,6 +44,41 @@ AddrBookContactQuery_getPtrCallbackMethodID(JNIEnv *jniEnv, jobject callback)
     return callbackMethodID;
 }
 
+jmethodID
+AddrBookContactQuery_getStringCallbackMethodID(
+        JNIEnv *jniEnv, jobject callback)
+{
+    jclass callbackClass;
+    jmethodID callbackMethodID = 0;
+
+    /*
+     * Make sure that the specified arguments are valid. For example, check
+     * whether callback exists and has the necessary signature.
+     */
+    if (callback)
+    {
+        callbackClass = (*jniEnv)->GetObjectClass(jniEnv, callback);
+        if (callbackClass)
+        {
+            callbackMethodID
+                = (*jniEnv)->GetMethodID(
+                        jniEnv,
+                        callbackClass, "callback", "(Ljava/lang/String;)Z");
+            if (!callbackMethodID)
+            {
+                Exception_throwNew(
+                    jniEnv, "java/lang/IllegalArgumentException", "callback");
+            }
+        }
+    }
+    else
+    {
+        Exception_throwNew(
+            jniEnv, "java/lang/NullPointerException", "callback");
+    }
+    return callbackMethodID;
+}
+
 static void
 Exception_throwNew(JNIEnv *jniEnv, const char *className, const char *message)
 {