Get rid of jackson (mostly)

Reviewed By: astreet

Differential Revision: D3041362

fb-gh-sync-id: a7027a08a63730b98dc766b86921820fa3624953
shipit-source-id: a7027a08a63730b98dc766b86921820fa3624953

ReactAndroid/src/main/java/com/facebook/react/bridge/JsonWriterHelper.java

@@ -0,0 +1,60 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+package com.facebook.react.bridge;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Helper for generating JSON for lists and maps.
+ */
+class JsonWriterHelper {
+  public static void value(JsonWriter writer, Object value) throws IOException {
+    if (value instanceof Map) {
+      mapValue(writer, (Map) value);
+    } else if (value instanceof List) {
+      listValue(writer, (List) value);
+    } else {
+      objectValue(writer, value);
+    }
+  }
+
+  private static void mapValue(JsonWriter writer, Map<?, ?> map) throws IOException {
+    writer.beginObject();
+    for (Map.Entry entry : map.entrySet()) {
+      writer.name(entry.getKey().toString());
+      value(writer, entry.getValue());
+    }
+    writer.endObject();
+  }
+
+  private static void listValue(JsonWriter writer, List<?> list) throws IOException {
+    writer.beginArray();
+    for (Object item : list) {
+      objectValue(writer, item);
+    }
+    writer.endArray();
+  }
+
+  private static void objectValue(JsonWriter writer, Object value) throws IOException {
+    if (value == null) {
+      writer.nullValue();
+    } else if (value instanceof String) {
+      writer.value((String) value);
+    } else if (value instanceof Number) {
+      writer.value((Number) value);
+    } else if (value instanceof Boolean) {
+      writer.value((Boolean) value);
+    } else {
+      throw new IllegalArgumentException("Unknown value: " + value);
+    }
+  }
+}