FINERACT-2081: Replace switch statements with if statements for better readability

fineract-client/src/main/java/org/apache/fineract/client/util/JSON.java

@@ -37,11 +37,11 @@ import java.time.OffsetDateTime;
 import java.time.format.DateTimeFormatter;
 import java.util.Date;
 import java.util.Objects;
+import lombok.Getter;
 import okhttp3.RequestBody;
 import okhttp3.ResponseBody;
 import org.apache.fineract.client.models.ExternalId;
 import org.apache.fineract.client.util.adapter.ExternalIdAdapter;
-import org.jetbrains.annotations.NotNull;
 import retrofit2.Converter;
 import retrofit2.Retrofit;
 import retrofit2.converter.gson.GsonConverterFactory;
@@ -51,6 +51,7 @@ import retrofit2.converter.gson.GsonConverterFactory;
 // The original JSON class is deleted during the build (see FINERACT-1231).
 public class JSON {
 
+    @Getter
     private final Gson gson;
     private final DateTypeAdapter dateTypeAdapter = new DateTypeAdapter();
     private final SqlDateTypeAdapter sqlDateTypeAdapter = new SqlDateTypeAdapter();
@@ -66,10 +67,6 @@ public class JSON {
                 .create();
     }
 
-    public Gson getGson() {
-        return gson;
-    }
-
     /**
      * GSON TypeAdapter for JSR-310 OffsetDateTime type.
      */
@@ -88,11 +85,11 @@ public class JSON {
 
         @Override
         public OffsetDateTime read(JsonReader in) throws IOException {
-            switch (in.peek()) {
-                case NULL:
+            JsonToken token = in.peek();
+            if (token == JsonToken.NULL) {
                 in.nextNull();
                 return null;
-                default:
+            }
             String date = in.nextString();
             if (date.endsWith("+0000")) {
                 date = date.substring(0, date.length() - 5) + "Z";
@@ -100,7 +97,6 @@ public class JSON {
             return OffsetDateTime.parse(date, formatter);
         }
     }
-    }
 
     /**
      * GSON TypeAdapter for JSR-310 LocalDate type, which Fineract API's RETURNS as JSON array in the
@@ -123,29 +119,34 @@ public class JSON {
 
         @Override
         public LocalDate read(JsonReader in) throws IOException {
-            switch (in.peek()) {
-                case NULL:
+            JsonToken token = in.peek();
+
+            if (token == JsonToken.NULL) {
                 in.nextNull();
                 return null;
-                case STRING:
+            }
+
+            if (token == JsonToken.STRING) {
                 String dateString = in.nextString();
-                    if (dateString != null && dateString.length() != 0) {
+                if (dateString != null && !dateString.isEmpty()) {
                     return LocalDate.parse(dateString);
                 }
                 return null;
-                case BEGIN_ARRAY:
+            }
+
+            if (token == JsonToken.BEGIN_ARRAY) {
                 in.beginArray();
                 int year = in.nextInt();
                 int month = in.nextInt();
                 int day = in.nextInt();
                 in.endArray();
                 return LocalDate.of(year, month, day);
-                default:
+            }
+
             throw new JsonParseException(
                     "Fineract's API normally always sends LocalDate as e.g. [2009,1,1].. or does it not?! (FINERACT-1220)");
         }
     }
-    }
 
     /**
      * GSON TypeAdapter for java.sql.Date type. If the dateFormat is null, a simple "yyyy-MM-dd" format will be used
@@ -172,11 +173,11 @@ public class JSON {
 
         @Override
         public java.sql.Date read(JsonReader in) throws IOException {
-            switch (in.peek()) {
-                case NULL:
+            JsonToken token = in.peek();
+            if (token == JsonToken.NULL) {
                 in.nextNull();
                 return null;
-                default:
+            }
             String date = in.nextString();
             try {
                 if (dateFormat != null) {
@@ -188,7 +189,6 @@ public class JSON {
             }
         }
     }
-    }
 
     /**
      * GSON TypeAdapter for java.util.Date type. If the dateFormat is null, ISO8601Utils will be used.
@@ -226,7 +226,6 @@ public class JSON {
             }
         }
 
-        @NotNull
         private Date parseDate(String date) {
             try {
                 if (null != dateFormat) {