Treat objects without default constructor

Author: Andre Bonna

README.md

@@ -18,7 +18,7 @@ Based on [facebook's Jest framework](https://facebook.github.io/jest/docs/en/sna
 
 
 
-#### How to install using [Maven](https://mvnrepository.com/artifact/io.github.json-snapshot/json-snapshot/1.0.9)
+#### How to install using [Maven](https://mvnrepository.com/artifact/io.github.json-snapshot/json-snapshot/1.0.11)
 
 
 
@@ -28,7 +28,7 @@ Add to your pom.xml dependencies section:
 <dependency>
     <groupId>io.github.json-snapshot</groupId>
     <artifactId>json-snapshot</artifactId>
-    <version>1.0.9</version>
+    <version>1.0.11</version>
 </dependency>
 ```
 

pom.xml

@@ -5,7 +5,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>io.github.json-snapshot</groupId>
     <artifactId>json-snapshot</artifactId>
-    <version>1.0.9</version>
+    <version>1.0.11</version>
     <packaging>jar</packaging>
 
     <name>json-snapshot</name>

src/main/java/io/github/jsonSnapshot/SnapshotCaptor.java

@@ -1,5 +1,6 @@
 package io.github.jsonSnapshot;
 
+import java.lang.reflect.Constructor;
 import java.lang.reflect.Field;
 
 public class SnapshotCaptor {
@@ -50,7 +51,8 @@ public Object removeIgnored(Object value) {
 
     private Object shallowCopy(Object value) {
         try {
-            Object newValue = this.argumentClass.newInstance();
+            Object newValue = constructCopy(this.argumentClass);
+
             Field[] fields = this.argumentClass.getDeclaredFields();
 
             for (Field field: fields) {
@@ -68,4 +70,35 @@ private Object shallowCopy(Object value) {
             throw new SnapshotMatchException("Class "+ this.argumentClass.getSimpleName() + " must have a default empty constructor!");
         }
     }
+
+    private Object constructCopy(Class<?> argumentClass)
+        throws InstantiationException, IllegalAccessException, java.lang.reflect.InvocationTargetException {
+
+        try {
+            return argumentClass.newInstance();
+        }
+        catch (Exception e) {
+            // Ignore - should log
+        }
+
+        Constructor[] constructors = argumentClass.getDeclaredConstructors();
+
+        if (constructors.length == 0) {
+            return argumentClass.newInstance();
+        }
+
+        int i = 0;
+        Class[] types = constructors[i].getParameterTypes();
+        Object[] paramValues = new Object[types.length];
+
+        for (int j = 0; j < types.length; j++) {
+            if (types[j].isPrimitive()) {
+                paramValues[j] = Integer.valueOf(0).byteValue();
+            }
+            else {
+                paramValues[j] = constructCopy(types[j]);
+            }
+        }
+        return constructors[i].newInstance(paramValues);
+    }
 }