add missed file

cygnus-common/src/main/java/com/telefonica/iot/cygnus/management/PatternTypeAdapter.java

@@ -0,0 +1,26 @@
+package com.telefonica.iot.cygnus.management;
+
+import com.google.gson.TypeAdapter;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonWriter;
+
+import java.io.IOException;
+import java.util.regex.Pattern;
+
+public class PatternTypeAdapter extends TypeAdapter<Pattern> {
+
+    @Override
+    public void write(JsonWriter out, Pattern pattern) throws IOException {
+        if (pattern == null) {
+            out.nullValue();
+            return;
+        }
+        out.value(pattern.pattern());
+    }
+
+    @Override
+    public Pattern read(JsonReader in) throws IOException {
+        String patternString = in.nextString();
+        return Pattern.compile(patternString);
+    }
+}