FINERACT-2114: Interest rate modification, adjust reschedule validation

fineract-core/src/main/java/org/apache/fineract/infrastructure/core/api/JsonCommand.java

@@ -262,6 +262,10 @@ public final class JsonCommand {
         return parameterExists(parameterName);
     }
 
+    public boolean hasParameterValue(final String parameterName) {
+        return this.fromApiJsonHelper.parameterHasValue(parameterName, this.parsedCommand);
+    }
+
     public String dateFormat() {
         return stringValueOfParameterNamed("dateFormat");
     }

fineract-core/src/main/java/org/apache/fineract/infrastructure/core/serialization/FromJsonHelper.java

@@ -157,6 +157,13 @@ public class FromJsonHelper {
         return this.helperDelegator.parameterExists(parameterName, element);
     }
 
+    /**
+     * Check Parameter has a non-blank value
+     */
+    public boolean parameterHasValue(final String parameterName, final JsonElement element) {
+        return this.helperDelegator.parameterHasValue(parameterName, element);
+    }
+
     public String extractStringNamed(final String parameterName, final JsonElement element) {
         return this.helperDelegator.extractStringNamed(parameterName, element, new HashSet<String>());
     }

fineract-core/src/main/java/org/apache/fineract/infrastructure/core/serialization/JsonParserHelper.java

@@ -61,6 +61,27 @@ public class JsonParserHelper {
         return element.getAsJsonObject().has(parameterName);
     }
 
+    /**
+     * Check Parameter has a non-blank value
+     */
+    public boolean parameterHasValue(final String parameterName, final JsonElement element) {
+        if (element == null || !element.isJsonObject()) {
+            return false;
+        }
+
+        var valueObject = element.getAsJsonObject().get(parameterName);
+        if (valueObject == null || valueObject.isJsonNull()) {
+            return false;
+        }
+        if (valueObject instanceof JsonArray) {
+            return !valueObject.getAsJsonArray().isEmpty();
+        }
+        if (valueObject instanceof JsonObject) {
+            return !valueObject.getAsJsonObject().isEmpty();
+        }
+        return valueObject.isJsonPrimitive() && !valueObject.getAsJsonPrimitive().getAsString().isBlank();
+    }
+
     public Boolean extractBooleanNamed(final String parameterName, final JsonElement element, final Set<String> requestParamatersDetected) {
         Boolean value = null;
         if (element.isJsonObject()) {