Add JsonUtils

Author: mythz

src/AndroidClient/client/src/main/java/net/servicestack/client/JsonUtils.java

@@ -0,0 +1,56 @@
+package net.servicestack.client;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Created by mythz on 2/10/2017.
+ */
+
+public class JsonUtils {
+
+    public static JsonObject toJsonObject(String json) {
+        JsonElement e = new JsonParser().parse(json);
+        if (e.isJsonObject()) {
+            return e.getAsJsonObject();
+        }
+        return null;
+    }
+
+    public static String asString(JsonObject obj, String key) {
+        if (obj == null)
+            return null;
+        if (key == null)
+            throw new IllegalArgumentException("key is null");
+
+        return asString(obj.get(key));
+    }
+
+    public static String asString(JsonElement el)
+    {
+        return el != null
+                ? el.getAsString()
+                : null;
+    }
+
+    public static long asLong(JsonObject obj, String key) {
+        return asLong(obj, key, 0);
+    }
+
+    public static long asLong(JsonObject obj, String key, long defaultValue) {
+        if (obj == null)
+            return defaultValue;
+        if (key == null)
+            throw new IllegalArgumentException("key is null");
+
+        JsonElement val = obj.get(key);
+
+        return val != null
+            ? val.getAsLong()
+            : defaultValue;
+    }
+}