Add checkDefaultConstructor() in CSVParser

1 files changed, 10 insertions, 0 deletions

diff --git a/src/main/java/it/alessandroiezzi/csv/CSVParser.java b/src/main/java/it/alessandroiezzi/csv/CSVParser.java
index 8df3b20..4ff346d 100644
--- a/src/main/java/it/alessandroiezzi/csv/CSVParser.java
+++ b/src/main/java/it/alessandroiezzi/csv/CSVParser.java
@@ -6,6 +6,7 @@ import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
+import java.lang.reflect.Constructor;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -16,9 +17,18 @@ public class CSVParser<T> {
     private String separator = ";";
     private final Class<T> cls;
 
+    private void checkDefaultConstructor() {
+        for (Constructor<?> constructor : cls.getConstructors()) {
+            if (constructor.getParameterCount() == 0) return;
+        }
+
+        throw new IllegalArgumentException("You need to define a constructor without parameters on " + cls.getName());
+    }
+
     public CSVParser(InputStream csvFile, Class<T> cls) {
         this.csvFile = csvFile;
         this.cls = cls;
+        checkDefaultConstructor();
     }
 
     public CSVParser<T> withSeparator(char separator) {