implement HasBinaryData

src/main/java/com/github/nkzawa/hasbinarydata/HasBinaryData.java

@@ -0,0 +1,44 @@
+package com.github.nkzawa.hasbinarydata;
+
+import org.json.JSONArray;
+import org.json.JSONObject;
+
+import java.util.Iterator;
+
+public class HasBinaryData {
+
+    private HasBinaryData() {}
+
+    public static boolean hasBinary(Object data) {
+        return recursiveCheckForBinary(data);
+    }
+
+    private static boolean recursiveCheckForBinary(Object obj) {
+        if (obj == null) return false;
+
+        if (obj instanceof byte[]) {
+            return true;
+        }
+
+        if (obj instanceof JSONArray) {
+            JSONArray _obj = (JSONArray)obj;
+            int length = _obj.length();
+            for (int i = 0; i < length; i++) {
+                if (recursiveCheckForBinary(_obj.get(i))) {
+                    return true;
+                }
+            }
+        } else if (obj instanceof JSONObject) {
+            JSONObject _obj = (JSONObject)obj;
+            Iterator keys = _obj.keys();
+            while (keys.hasNext()) {
+                String key = (String)keys.next();
+                if (recursiveCheckForBinary(_obj.get(key))) {
+                    return true;
+                }
+            }
+        }
+
+        return false;
+    }
+}