added the getters

pom.xml

@@ -4,7 +4,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.github.shautvast</groupId>
     <artifactId>reflective</artifactId>
-    <version>1.0.0</version>
+    <version>1.2.1</version>
     <name>reflective</name>
     <description>Reflective utils that don't use java.lang.reflect</description>
 
@@ -24,6 +24,17 @@
             <artifactId>asm-tree</artifactId>
             <version>9.4</version>
         </dependency>
+        <dependency>
+            <groupId>org.openjdk.jol</groupId>
+            <artifactId>jol-core</artifactId>
+            <version>0.17</version>
+        </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <version>1.18.26</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <distributionManagement>

src/main/java/com/github/shautvast/reflective/InvokerFactory.java

@@ -7,13 +7,15 @@ import com.github.shautvast.rusty.Result;
 import org.objectweb.asm.ClassWriter;
 import org.objectweb.asm.tree.*;
 
+import java.io.FileOutputStream;
+import java.io.IOException;
 import java.lang.reflect.InvocationTargetException;
 
-import static com.github.shautvast.reflective.java.Java.*;
 import static com.github.shautvast.reflective.java.Java.DOUBLE;
 import static com.github.shautvast.reflective.java.Java.FLOAT;
 import static com.github.shautvast.reflective.java.Java.INTEGER;
 import static com.github.shautvast.reflective.java.Java.LONG;
+import static com.github.shautvast.reflective.java.Java.*;
 import static com.github.shautvast.rusty.Result.err;
 import static com.github.shautvast.rusty.Result.ok;
 import static org.objectweb.asm.Opcodes.*;
@@ -32,7 +34,7 @@ public class InvokerFactory {
      */
     public static Result<AbstractInvoker> of(MetaMethod method) {
         // new ASM ClassNode with default constructor
-        String className = "Invoker" + method.getName() + method.getDescriptor().replaceAll("[()/;\\[]", "");
+        String className = "Invoker" + method.getMetaClass().getJavaClass().getSimpleName() + method.getName() + method.getDescriptor().replaceAll("[()/;\\[]", "");
         if (ByteClassLoader.INSTANCE.isDefined(className)) {
             return getInvoker(className);
         }
@@ -58,12 +60,14 @@ public class InvokerFactory {
             }
             // put argument on the stack
             insns.add(new InsnNode(AALOAD));
-            insns.add(new TypeInsnNode(CHECKCAST, method.getParameters().get(i).getDescriptor()));
+            String type = internalName(mapPrimitiveToWrapper(method.getParameters().get(i).getType()).getName());
+            insns.add(new TypeInsnNode(CHECKCAST, type));
+            unwrapPrimitive(method.getParameters().get(i), insns);
         }
         // call the method
         insns.add(new MethodInsnNode(INVOKEVIRTUAL, method.getMetaClass().getRawName(), method.getName(), method.getDescriptor()));
         // if the returned argument is primitive, wrap it as an Object
-        wrapAnyPrimitivesForReturnObject(method, invokerMethod);
+        wrapPrimitive(method.getReturnParameter(), invokerMethod.instructions);
         // return the object on the stack
         insns.add(new InsnNode(ARETURN));
 
@@ -75,6 +79,12 @@ public class InvokerFactory {
         classNode.accept(classWriter);
         byte[] byteArray = classWriter.toByteArray();
 
+        try (FileOutputStream out = new FileOutputStream(method.getMetaClass().getName() + "_" + method.getName() + ".class")) {
+            out.write(byteArray);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
         // load it into the JVM
         ByteClassLoader.INSTANCE.addClass(className, byteArray);
         return getInvoker(classNode.name);
@@ -89,12 +99,39 @@ public class InvokerFactory {
         }
     }
 
+    private static void unwrapPrimitive(Parameter<?> parameter, InsnList insns) {
+        switch (parameter.getDescriptor()) {
+            case "B":
+                insns.add(new MethodInsnNode(INVOKEVIRTUAL, "java/lang/Byte", "byteValue", "()B"));
+                break;
+            case "S":
+                insns.add(new MethodInsnNode(INVOKEVIRTUAL, "java/lang/Short", "shortValue", "()S"));
+                break;
+            case "I":
+                insns.add(new MethodInsnNode(INVOKEVIRTUAL, "java/lang/Integer", "intValue", "()I"));
+                break;
+            case "Z":
+                insns.add(new MethodInsnNode(INVOKEVIRTUAL, "java/lang/Boolean", "booleanValue", "()Z"));
+                break;
+            case "J":
+                insns.add(new MethodInsnNode(INVOKEVIRTUAL, "java/lang/Long", "longValue", "()J"));
+                break;
+            case "F":
+                insns.add(new MethodInsnNode(INVOKEVIRTUAL, "java/lang/Float", "floatValue", "()F"));
+                break;
+            case "D":
+                insns.add(new MethodInsnNode(INVOKEVIRTUAL, "java/lang/Double", "doubleValue", "()D"));
+                break;
+            case "C":
+                insns.add(new MethodInsnNode(INVOKEVIRTUAL, "java/lang/Character", "charValue", "()C"));
+        }
+    }
+
     /*
      * wrap primitives in their wrapper
      */
-    private static void wrapAnyPrimitivesForReturnObject(MetaMethod m, MethodNode invokerMethod) {
+    private static void wrapPrimitive(Parameter<?> parameter, InsnList insns) {
-        InsnList insns = invokerMethod.instructions;
+        switch (parameter.getDescriptor()) {
-        switch (m.getReturnParameter().getDescriptor()) {
             case "V":
                 insns.add(new InsnNode(ACONST_NULL));
                 break;
@@ -120,10 +157,32 @@ public class InvokerFactory {
                 insns.add(new MethodInsnNode(INVOKESTATIC, SHORT, VALUEOF, "(S)Ljava/lang/Short;"));
                 break;
             case "B":
-                insns.add(new MethodInsnNode(INVOKESTATIC, "java/lang/Byte", VALUEOF, "(B)Ljava/lang/Byte;"));
+                insns.add(new MethodInsnNode(INVOKESTATIC, BYTE, VALUEOF, "(B)Ljava/lang/Byte;"));
                 break;
         }
     }
 
+    private static Class<?> mapPrimitiveToWrapper(Class<?> type) {
+        if (type == int.class) {
+            return Integer.class;
+        } else if (type == byte.class) {
+            return Byte.class;
+        } else if (type == short.class) {
+            return Short.class;
+        } else if (type == long.class) {
+            return Long.class;
+        } else if (type == float.class) {
+            return Float.class;
+        } else if (type == double.class) {
+            return Double.class;
+        } else if (type == char.class) {
+            return Character.class;
+        } else if (type == boolean.class) {
+            return Boolean.class;
+        } else {
+            return type;
+        }
+    }
+
 
 }

src/main/java/com/github/shautvast/reflective/Main.java

@@ -1,28 +0,0 @@
-package com.github.shautvast.reflective;
-
-import com.github.shautvast.reflective.MetaClass;
-import com.github.shautvast.reflective.Reflective;
-
-public class Main {
-    public static void main(String[] args) {
-        Dummy dummy = new Dummy();
-        dummy.setName("foo");
-        MetaClass metaDummy = Reflective.getMetaClass(dummy.getClass());
-
-        metaDummy.getMethod("setName")
-                .ifPresent(m -> m.invoke(dummy, "bar"));
-        System.out.println(dummy.getName()); // prints "bar"
-    }
-
-    public static class Dummy {
-        private String name;
-
-        public String getName() {
-            return name;
-        }
-
-        public void setName(String name) {
-            this.name = name;
-        }
-    }
-}

src/main/java/com/github/shautvast/reflective/MetaClass.java

@@ -34,6 +34,7 @@ public class MetaClass {
         return Set.copyOf(methods.values());
     }
 
+    // should account for overloading!
     public Optional<MetaMethod> getMethod(String name) {
         return Optional.ofNullable(methods.get(name));
     }
@@ -43,7 +44,7 @@ public class MetaClass {
     }
 
     void addField(int access, String name, String descriptor) {
-        fields.put(name, new MetaField(name, access)); //ASM access same as reflect modifiers?
+        fields.put(name, new MetaField(name, access, Java.toClass(descriptor))); //ASM access same as reflect modifiers?
     }
 
     public void addMethod(int access, String name, String descriptor) {
@@ -61,4 +62,6 @@ public class MetaClass {
     public String getRawName() {
         return rawName;
     }
+
+
 }

src/main/java/com/github/shautvast/reflective/MetaField.java

@@ -5,9 +5,12 @@ public class MetaField {
     private final String name;
     private final int modifiers;
 
-    public MetaField(String name, int modifiers) {
+    private final Class<?> type;
+
+    public MetaField(String name, int modifiers, Class<?> type) {
         this.name = name;
         this.modifiers = modifiers;
+        this.type = type;
     }
 
     public String getName() {

src/main/java/com/github/shautvast/reflective/MetaMethod.java

@@ -78,13 +78,13 @@ public class MetaMethod {
         StringBuilder buf = new StringBuilder();
         for (int i = 0; i < parms.length(); i++) {
             String t = Character.toString(parms.charAt(i));
-            if (!"L".equals(t) && buf.length() == 0) {
+            if (!"[".equals(t) && !"L".equals(t) && buf.length() == 0) {
-                mutableParams.add(new Parameter<>(Java.getClassFromDescriptor(t), t));
+                mutableParams.add(new Parameter<>(Java.toClass(t), t));
             }
             if (";".equals(t)) {
                 buf.append(t);
                 String desc = buf.toString();
-                mutableParams.add(new Parameter<>(Java.getClassFromDescriptor(desc), correct(desc)));
+                mutableParams.add(new Parameter<>(Java.toClass(desc), correct(desc)));
                 buf = new StringBuilder();
             } else {
                 buf.append(t);
@@ -93,7 +93,7 @@ public class MetaMethod {
 
         String returnDesc = split[2];
         this.returnParameter = new Parameter<>(
-                Java.getClassFromDescriptor(returnDesc),
+                Java.toClass(returnDesc),
                 correct(returnDesc));
 
         return Collections.unmodifiableList(mutableParams);

src/main/java/com/github/shautvast/reflective/Parameter.java

@@ -5,6 +5,9 @@ public class Parameter<T> {
     private final String descriptor;
 
     public Parameter(Class<T> type, String descriptor) {
+        if (type ==null){
+            throw new IllegalArgumentException("Type cannot be null");
+        }
         this.type = type;
         this.descriptor = descriptor;
     }
@@ -17,10 +20,6 @@ public class Parameter<T> {
         return type == Void.class;
     }
 
-    public boolean isPrimitive(){
-        return !descriptor.startsWith("L");
-    }
-
     public String getDescriptor() {
         return descriptor;
     }

src/main/java/com/github/shautvast/reflective/array/ArrayFactory.java

@@ -0,0 +1,240 @@
+package com.github.shautvast.reflective.array;
+
+import com.github.shautvast.reflective.array.base.*;
+
+import java.lang.reflect.Array;
+
+/**
+ * Public interface for dynamically working with arrays (create, set and get operations)
+ * <p>
+ * Drop in replacement for java.lang.reflect.Array
+ */
+public final class ArrayFactory {
+
+    private ArrayFactory() {
+    }
+
+    /**
+     * Creates a new array of the specified type and dimensions
+     *
+     * @param elementType the array element type
+     * @param dimensions  array of ints, ie {10} means 1 dimension, length 10. {10,20} means 2 dimensions, size 10 by 20
+     * @return an object that you can cast to the expected array type
+     */
+    public static Object newInstance(Class<?> elementType, int... dimensions) {
+        return ArrayHandlerFactory.getCreatorInstance(elementType, dimensions).newInstance();
+    }
+
+    /**
+     * Sets an Object value on an array
+     *
+     * @param array the array on which the value is set
+     * @param index the array index
+     * @param value the value to set
+     */
+    public static void set(Object array, int index, Object value) {
+        ArrayHandlerFactory.getAccessorInstance(ObjectArrayAccessor.class, typeChecked(array)).set(array, index, value);
+    }
+
+    /**
+     * Gets a Object value from an array
+     *
+     * @param array the array to access
+     * @param index
+     * @return the value of the array at the index
+     */
+    public static Object get(Object array, int index) {
+        return ArrayHandlerFactory.getAccessorInstance(ObjectArrayAccessor.class, typeChecked(array)).get(array, index);
+    }
+
+    /**
+     * Sets an int value on an array
+     *
+     * @param array the array on which the value is set
+     * @param index the array index
+     * @param value the value to set
+     */
+    public static void setInt(Object array, int index, int value) {
+        ArrayHandlerFactory.getAccessorInstance(IntArrayAccessor.class, typeChecked(array)).set(array, index, value);
+    }
+
+    /**
+     * Gets an int value from an array
+     *
+     * @param array the array to access
+     * @param index
+     * @return the value of the array at the index
+     */
+    public static int getInt(Object array, int index) {
+        return ArrayHandlerFactory.getAccessorInstance(IntArrayAccessor.class, typeChecked(array)).get(array, index);
+    }
+
+    /**
+     * Sets a byte value on an array
+     *
+     * @param array the array on which the value is set
+     * @param index the array index
+     * @param value the value to set
+     */
+    public static void setByte(Object array, int index, byte value) {
+        ArrayHandlerFactory.getAccessorInstance(ByteArrayAccessor.class, typeChecked(array)).set(array, index, value);
+    }
+
+    /**
+     * Gets a byte value from an array
+     *
+     * @param array the array to access
+     * @param index
+     * @return the value of the array at the index
+     */
+    public static byte getByte(Object array, int index) {
+        return ArrayHandlerFactory.getAccessorInstance(ByteArrayAccessor.class, typeChecked(array)).get(array, index);
+    }
+
+    /**
+     * Sets a short value on an array
+     *
+     * @param array the array on which the value is set
+     * @param index the array index
+     * @param value the value to set
+     */
+    public static void setShort(Object array, int index, short value) {
+        ArrayHandlerFactory.getAccessorInstance(ShortArrayAccessor.class, typeChecked(array)).set(array, index, value);
+    }
+
+    /**
+     * Gets a short value from an array
+     *
+     * @param array the array to access
+     * @param index
+     * @return the value of the array at the index
+     */
+    public static short getShort(Object array, int index) {
+        return ArrayHandlerFactory.getAccessorInstance(ShortArrayAccessor.class, typeChecked(array)).get(array, index);
+    }
+
+    /**
+     * Sets a long value on an array
+     *
+     * @param array the array on which the value is set
+     * @param index the array index
+     * @param value the value to set
+     */
+    public static void setLong(Object array, int index, long value) {
+        ArrayHandlerFactory.getAccessorInstance(LongArrayAccessor.class, typeChecked(array)).set(array, index, value);
+    }
+
+    /**
+     * Gets a long value from an array
+     *
+     * @param array the array to access
+     * @param index
+     * @return the value of the array at the index
+     */
+    public static long getLong(Object array, int index) {
+        return ArrayHandlerFactory.getAccessorInstance(LongArrayAccessor.class, typeChecked(array)).get(array, index);
+    }
+
+    /**
+     * Sets a byte value on an array
+     *
+     * @param array the array on which the value is set
+     * @param index the array index
+     * @param value the value to set
+     */
+    public static void setFloat(Object array, int index, float value) {
+        ArrayHandlerFactory.getAccessorInstance(FloatArrayAccessor.class, typeChecked(array)).set(array, index, value);
+    }
+
+    /**
+     * Gets a float value from an array
+     *
+     * @param array the array to access
+     * @param index
+     * @return the value of the array at the index
+     */
+    public static float getFloat(Object array, int index) {
+        return ArrayHandlerFactory.getAccessorInstance(FloatArrayAccessor.class, typeChecked(array)).get(array, index);
+    }
+
+    /**
+     * Sets a double value on an array
+     *
+     * @param array the array on which the value is set
+     * @param index the array index
+     * @param value the value to set
+     */
+    public static void setDouble(Object array, int index, double value) {
+        ArrayHandlerFactory.getAccessorInstance(DoubleArrayAccessor.class, typeChecked(array)).set(array, index, value);
+    }
+
+    /**
+     * Gets a double value from an array
+     *
+     * @param array the array to access
+     * @param index
+     * @return the value of the array at the index
+     */
+    public static double getDouble(Object array, int index) {
+        return ArrayHandlerFactory.getAccessorInstance(DoubleArrayAccessor.class, typeChecked(array)).get(array, index);
+    }
+
+    /**
+     * Sets a char value on an array
+     *
+     * @param array the array on which the value is set
+     * @param index the array index
+     * @param value the value to set
+     */
+    public static void setChar(Object array, int index, char value) {
+        ArrayHandlerFactory.getAccessorInstance(CharArrayAccessor.class, typeChecked(array)).set(array, index, value);
+    }
+
+    /**
+     * Gets a char value from an array
+     *
+     * @param array the array to access
+     * @param index
+     * @return the value of the array at the index
+     */
+    public static char getChar(Object array, int index) {
+        return ArrayHandlerFactory.getAccessorInstance(CharArrayAccessor.class, typeChecked(array)).get(array, index);
+    }
+
+    /**
+     * Sets a boolean value on an array
+     *
+     * @param array the array on which the value is set
+     * @param index the array index
+     * @param value the value to set
+     */
+    public static void setBoolean(Object array, int index, boolean value) {
+        ArrayHandlerFactory.getAccessorInstance(BooleanArrayAccessor.class, typeChecked(array)).set(array, index, value);
+    }
+
+    /**
+     * Gets a boolean value from an array
+     *
+     * @param array the array to access
+     * @param index
+     * @return the value of the array at the index
+     */
+    public static boolean getBoolean(Object array, int index) {
+        return ArrayHandlerFactory.getAccessorInstance(BooleanArrayAccessor.class, typeChecked(array)).get(array, index);
+    }
+
+    /*
+     * Only checks if object is an array, not the type of that array. TODO
+     */
+    private static Class<?> typeChecked(Object array) {
+        if (array == null) {
+            throw new NullPointerException("Argument is null");
+        }
+        Class<?> arrayType = array.getClass();
+        if (!arrayType.isArray()) {
+            throw new IllegalArgumentException("Argument is not an array");
+        }
+        return arrayType;
+    }
+
+}

src/main/java/com/github/shautvast/reflective/array/ArrayHandlerFactory.java

@@ -0,0 +1,207 @@
+package com.github.shautvast.reflective.array;
+
+import com.github.shautvast.reflective.array.base.ArrayCreator;
+import com.github.shautvast.reflective.array.base.ArrayAccessor;
+import com.github.shautvast.reflective.array.base.ObjectArrayAccessor;
+import com.github.shautvast.reflective.java.ASM;
+import com.github.shautvast.reflective.java.ByteClassLoader;
+import com.github.shautvast.reflective.java.Java;
+import org.objectweb.asm.ClassWriter;
+import org.objectweb.asm.tree.*;
+
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import static org.objectweb.asm.Opcodes.*;
+
+class ArrayHandlerFactory {
+    /* cache for the compiled creator classes */
+    private static final Map<String, ArrayCreator> creatorCache = new ConcurrentHashMap<>();
+
+    /* Cache for the compiled accessor classes.
+     *  The outer Map contains the ArrayAccessor type (some primitive or Object Accessor)
+     *  That maps to the concrete calculated ArrayAccessor instance name which maps to the instance itself.
+     *  TODO see if this can be optimized
+     */
+    private static final Map<Class<? extends ArrayAccessor>, Map<String, Object>> accessorCache = new ConcurrentHashMap<>();
+
+
+    /*
+     * generic method for creating array accessors (primitives and objects)
+     */
+    @SuppressWarnings("unchecked")
+    static <T extends ArrayAccessor> T getAccessorInstance(Class<T> accessorBaseType, Class<?> arrayType) {
+        String arrayTypeName = Java.internalName(arrayType);
+        String syntheticClassName = "com/shautvast/reflective/array/ArrayAccessor_"
+                + Java.javaName(arrayTypeName) + Java.getNumDimensions(arrayType);
+
+        return (T) accessorCache.computeIfAbsent(accessorBaseType, k -> new ConcurrentHashMap<>()).
+                computeIfAbsent(syntheticClassName,
+                        k -> ArrayHandlerFactory.createSyntheticArrayAccessor(accessorBaseType, arrayTypeName, syntheticClassName));
+    }
+
+    /*  creates an instance of an ArrayCreator of the specified type */
+    static ArrayCreator getCreatorInstance(Class<?> elementType, int... dimensions) {
+        String elementTypeName = Java.internalName(elementType);
+        String syntheticClassName = "com/shautvast/reflective/array/ArrayCreator_"
+                + Java.javaName(elementTypeName) + dimensions.length;
+
+        return creatorCache.computeIfAbsent(syntheticClassName,
+                k -> ArrayHandlerFactory.createSyntheticArrayCreator(elementTypeName, syntheticClassName, dimensions));
+    }
+
+    /* Creates the ASM ClassNode for an ArrayCreator */
+    static ArrayCreator createSyntheticArrayCreator(String elementType, String name, int... dimensions) {
+        ClassNode classNode = ASM.createDefaultClassNode(name, Java.internalName(ArrayCreator.class));
+        classNode.methods.add(createNewInstanceMethodNode(elementType, dimensions));
+        ClassWriter classWriter = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
+        classNode.accept(classWriter);
+
+        byte[] byteArray = classWriter.toByteArray();
+
+//        try (FileOutputStream out = new FileOutputStream(name + ".class")) {
+//            out.write(byteArray);
+//        } catch (IOException e) {
+//            e.printStackTrace();
+//        }
+
+        ByteClassLoader.INSTANCE.addClass(classNode.name, byteArray);
+
+        try {
+            return (ArrayCreator) (ByteClassLoader.INSTANCE.loadClass(classNode.name).getConstructor().newInstance());
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    /* Creates the ASM ClassNode for an ArrayAccessor */
+    static <T> T createSyntheticArrayAccessor(Class<T> accessorType, String arrayType, String name) {
+        ClassNode classNode = ASM.createDefaultClassNode(name, Java.internalName(accessorType));
+        classNode.methods.add(createSetMethodNode(accessorType, arrayType));
+        classNode.methods.add(createGetMethodNode(accessorType, arrayType));
+        ClassWriter classWriter = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
+        classNode.accept(classWriter);
+
+        byte[] byteArray = classWriter.toByteArray();
+
+        try (FileOutputStream out = new FileOutputStream("A.class")) {
+            out.write(byteArray);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        ByteClassLoader.INSTANCE.addClass(classNode.name, byteArray);
+
+        try {
+            return accessorType.cast(ByteClassLoader.INSTANCE.loadClass(classNode.name).getConstructor().newInstance());
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    /* Creates the newInstance method for ArrayCreator classes */
+    private static MethodNode createNewInstanceMethodNode(String componentType, int[] dimensions) {
+        MethodNode methodNode = new MethodNode(ACC_PUBLIC,
+                "newInstance", "()Ljava/lang/Object;", null, null);
+        InsnList insns = methodNode.instructions;
+        Arrays.stream(dimensions).forEach(d -> insns.add(new LdcInsnNode(d)));
+        insns.add(new MultiANewArrayInsnNode(Java.createArrayType(componentType, dimensions), dimensions.length));
+        insns.add(new InsnNode(ARETURN));
+        return methodNode;
+    }
+
+    /* Creates the set method for ArrayAccessor classes */
+    private static MethodNode createSetMethodNode(Class<?> accessorType, String arrayType) {
+        String elementType;
+        if (accessorType == ObjectArrayAccessor.class) {
+            elementType = "Ljava/lang/Object;";
+        } else {
+            elementType = arrayType.substring(1);
+        }
+        MethodNode methodNode = new MethodNode(ACC_PUBLIC,
+                "set", "(Ljava/lang/Object;I" + elementType + ")V", null, null);
+        int[] opcodes = arrayStoreInstructions(elementType);
+        InsnList insns = methodNode.instructions;
+        insns.add(new VarInsnNode(ALOAD, 1));
+        insns.add(new TypeInsnNode(CHECKCAST, arrayType));
+        insns.add(new VarInsnNode(ILOAD, 2));
+        insns.add(new VarInsnNode(opcodes[0], 3));
+        insns.add(new InsnNode(opcodes[1]));
+        insns.add(new InsnNode(RETURN));
+
+        return methodNode;
+    }
+
+    private static MethodNode createGetMethodNode(Class<?> accessorType, String arrayType) {
+        String elementType;
+        if (accessorType == ObjectArrayAccessor.class) {
+            elementType = "Ljava/lang/Object;";
+        } else {
+            elementType = arrayType.substring(1);
+        }
+        MethodNode methodNode = new MethodNode(ACC_PUBLIC,
+                "get", "(Ljava/lang/Object;I)" + elementType, null, null);
+        InsnList insns = methodNode.instructions;
+        int[] opcodes = arrayLoadAndReturnInstructions(elementType);
+        insns.add(new VarInsnNode(ALOAD, 1));
+        insns.add(new TypeInsnNode(CHECKCAST, arrayType));
+        insns.add(new VarInsnNode(ILOAD, 2));
+        insns.add(new InsnNode(opcodes[0]));
+        insns.add(new InsnNode(opcodes[1]));
+
+        return methodNode;
+    }
+
+    /*
+     * gets the pair of appropriate load (type) and store (array of type) instructions
+     */
+    private static int[] arrayStoreInstructions(String type) {
+        switch (type) {
+            case "B":
+            case "Z":
+                return new int[]{ILOAD, BASTORE};
+            case "S":
+                return new int[]{ILOAD, SASTORE};
+            case "I":
+                return new int[]{ILOAD, IASTORE};
+            case "J":
+                return new int[]{LLOAD, LASTORE};
+            case "F":
+                return new int[]{FLOAD, FASTORE};
+            case "D":
+                return new int[]{DLOAD, DASTORE};
+            case "C":
+                return new int[]{ILOAD, CASTORE};
+            default:
+                return new int[]{ALOAD, AASTORE};
+        }
+    }
+
+    /*
+     * gets the pair of appropriate load (type) and store (array of type) instructions
+     */
+    private static int[] arrayLoadAndReturnInstructions(String type) {
+        switch (type) {
+            case "B":
+            case "Z":
+                return new int[]{BALOAD, IRETURN};
+            case "I":
+                return new int[]{IALOAD, IRETURN};
+            case "S":
+                return new int[]{SALOAD, IRETURN};
+            case "C":
+                return new int[]{CALOAD, IRETURN};
+            case "J":
+                return new int[]{LALOAD, LRETURN};
+            case "F":
+                return new int[]{FALOAD, FRETURN};
+            case "D":
+                return new int[]{DALOAD, DRETURN};
+            default:
+                return new int[]{AALOAD, ARETURN};
+        }
+    }
+}

src/main/java/com/github/shautvast/reflective/array/base/ArrayAccessor.java

@@ -0,0 +1,7 @@
+package com.github.shautvast.reflective.array.base;
+
+/**
+ * Empty interface because you can't be generic over primitives in Java
+ */
+public interface ArrayAccessor {
+}

src/main/java/com/github/shautvast/reflective/array/base/ArrayCreator.java

@@ -0,0 +1,6 @@
+package com.github.shautvast.reflective.array.base;
+
+public abstract class ArrayCreator {
+
+    public abstract Object newInstance();
+}

src/main/java/com/github/shautvast/reflective/array/base/BooleanArrayAccessor.java

@@ -0,0 +1,6 @@
+package com.github.shautvast.reflective.array.base;
+
+public abstract class BooleanArrayAccessor implements ArrayAccessor {
+    public abstract void set(Object array, int index, boolean value);
+    public abstract boolean get(Object array, int index);
+}

src/main/java/com/github/shautvast/reflective/array/base/ByteArrayAccessor.java

@@ -0,0 +1,8 @@
+package com.github.shautvast.reflective.array.base;
+
+public abstract class ByteArrayAccessor implements ArrayAccessor {
+
+    public abstract void set(Object array, int index, byte value);
+
+    public abstract byte get(Object array, int index);
+}

src/main/java/com/github/shautvast/reflective/array/base/CharArrayAccessor.java

@@ -0,0 +1,7 @@
+package com.github.shautvast.reflective.array.base;
+
+public abstract class CharArrayAccessor implements ArrayAccessor {
+
+    public abstract void set(Object array, int index, char value);
+    public abstract char get(Object array, int index);
+}

src/main/java/com/github/shautvast/reflective/array/base/DoubleArrayAccessor.java

@@ -0,0 +1,7 @@
+package com.github.shautvast.reflective.array.base;
+
+public abstract class DoubleArrayAccessor implements ArrayAccessor {
+
+    public abstract void set(Object array, int index, double value);
+    public abstract double get(Object array, int index);
+}

src/main/java/com/github/shautvast/reflective/array/base/FloatArrayAccessor.java

@@ -0,0 +1,8 @@
+package com.github.shautvast.reflective.array.base;
+
+public abstract class FloatArrayAccessor implements ArrayAccessor {
+
+    public abstract void set(Object array, int index, float value);
+
+    public abstract float get(Object array, int index);
+}

src/main/java/com/github/shautvast/reflective/array/base/IntArrayAccessor.java

@@ -0,0 +1,7 @@
+package com.github.shautvast.reflective.array.base;
+
+public abstract class IntArrayAccessor implements ArrayAccessor {
+    public abstract void set(Object array, int index, int value);
+
+    public abstract int get(Object array, int index);
+}

src/main/java/com/github/shautvast/reflective/array/base/LongArrayAccessor.java

@@ -0,0 +1,8 @@
+package com.github.shautvast.reflective.array.base;
+
+public abstract class LongArrayAccessor implements ArrayAccessor {
+
+    public abstract void set(Object array, int index, long value);
+
+    public abstract long get(Object array, int index);
+}

src/main/java/com/github/shautvast/reflective/array/base/ObjectArrayAccessor.java

@@ -0,0 +1,6 @@
+package com.github.shautvast.reflective.array.base;
+
+public abstract class ObjectArrayAccessor implements ArrayAccessor {
+    public abstract void set(Object array, int index, Object value);
+    public abstract Object get(Object array, int index);
+}

src/main/java/com/github/shautvast/reflective/array/base/ShortArrayAccessor.java

@@ -0,0 +1,8 @@
+package com.github.shautvast.reflective.array.base;
+
+public abstract class ShortArrayAccessor implements ArrayAccessor {
+
+    public abstract void set(Object array, int index, short value);
+
+    public abstract short get(Object array, int index);
+}

src/main/java/com/github/shautvast/reflective/java/ByteClassLoader.java

@@ -23,7 +23,7 @@ public class ByteClassLoader extends ClassLoader {
     }
 
     public void addClass(String name, byte[] bytecode) {
-        Class<?> classDef = defineClass(name, bytecode, 0, bytecode.length);
+        Class<?> classDef = defineClass(null, bytecode, 0, bytecode.length);
         classes.put(name, classDef);
     }
 

src/main/java/com/github/shautvast/reflective/java/Java.java

@@ -4,8 +4,6 @@ import org.objectweb.asm.ClassReader;
 
 import java.io.IOException;
 
-import static java.lang.reflect.Array.newInstance;
-
 /*
  * common utils not for external use
  */
@@ -22,6 +20,7 @@ public class Java {
     public static final String DOUBLE = "java/lang/Double";
     public static final String CHAR = "java/lang/Character";
     public static final String SHORT = "java/lang/Short";
+    public static final String BYTE = "java/lang/Byte";
 
     public static String internalName(String className) {
         return className.replaceAll("\\.", "/");
@@ -106,49 +105,116 @@ public class Java {
         throw new RuntimeException();
     }
 
-    public static Class<?> getClassFromDescriptor(String descriptor) {
+    public static Class<?> toClass(String descriptor) {
-        int arrayDims = 0;
+        try {
-        while (descriptor.startsWith("[")) {
+            if (descriptor.length() == 1) {
-            arrayDims++;
+                return mapIfPrimitive(descriptor.charAt(0));
-            descriptor = descriptor.substring(1);
-        } //could be cheaper
-
-        if (descriptor.startsWith("L") && descriptor.endsWith(";")) {
-            try {
-                String className = descriptor.substring(1, descriptor.length() - 1).replaceAll("/", ".");
-                Class<?> clazz = Class.forName(className);
-                if (arrayDims > 0) {
-                    clazz = newInstance(clazz, new int[arrayDims]).getClass();
-                }
-                return clazz;
-            } catch (ClassNotFoundException e) {
-                throw new RuntimeException(e); // not supposed to happen
             }
-        } else {
+            if (!descriptor.startsWith("[") && descriptor.endsWith(";")) {
-            char typeChar = descriptor.charAt(0);
+                descriptor = descriptor.substring(0, descriptor.length() - 1);
-            boolean isArray = arrayDims != 0;
-            switch (typeChar) {
-                case 'B':
-                    return isArray ? newInstance(byte.class, new int[arrayDims]).getClass() : byte.class;
-                case 'C':
-                    return isArray ? newInstance(char.class, new int[arrayDims]).getClass() : char.class;
-                case 'D':
-                    return isArray ? newInstance(double.class, new int[arrayDims]).getClass() : double.class;
-                case 'F':
-                    return isArray ? newInstance(float.class, new int[arrayDims]).getClass() : float.class;
-                case 'I':
-                    return isArray ? newInstance(int.class, new int[arrayDims]).getClass() : int.class;
-                case 'J':
-                    return isArray ? newInstance(long.class, new int[arrayDims]).getClass() : long.class;
-                case 'S':
-                    return isArray ? newInstance(short.class, new int[arrayDims]).getClass() : short.class;
-                case 'Z':
-                    return isArray ? newInstance(boolean.class, new int[arrayDims]).getClass() : boolean.class;
-                case 'V':
-                    return Void.class;
-                default:
-                    throw new RuntimeException(new ClassNotFoundException("unknown descriptor: " + descriptor)); //must not happen
             }
+            int i = 0;
+            while (descriptor.charAt(i) == '[' && i < 256) {
+                i++;
+            }
+            assert i < 256;
+            String dims = descriptor.substring(0, i);
+            String type = descriptor.substring(i);
+            if (i == 0 && type.startsWith("L")) {
+                type = type.substring(1);
+            }
+            type = Java.externalName(type);
+            Class<?> aClass = Class.forName(dims + type);
+            return aClass;
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
         }
     }
+
+    private static Class<?> mapIfPrimitive(char descriptor) {
+        switch (descriptor) {
+            case 'B':
+                return byte.class;
+            case 'S':
+                return short.class;
+            case 'I':
+                return int.class;
+            case 'J':
+                return long.class;
+            case 'F':
+                return float.class;
+            case 'D':
+                return double.class;
+            case 'C':
+                return char.class;
+            case 'Z':
+                return boolean.class;
+            case 'V':
+                return Void.class;
+            default:
+                return null;
+        }
+    }
+
+    /* strips all disallowed characters from a classname */
+    public static String javaName(String arrayTypeName) {
+        return arrayTypeName
+                .replaceAll("[/.\\[;]", "")
+                .toLowerCase();
+    }
+
+    public static String mapPrimitiveOrArrayName(String type) {
+        switch (type) {
+            case "byte":
+                return "B";
+            case "short":
+                return "S";
+            case "int":
+                return "I";
+            case "long":
+                return "J";
+            case "float":
+                return "F";
+            case "double":
+                return "D";
+            case "char":
+                return "C";
+            case "boolean":
+                return "Z";
+            default:
+                if (type.startsWith("[") || type.contains("/")) {
+                    return type;
+                } else {
+                    throw new IllegalArgumentException(type + "?");
+                }
+        }
+    }
+
+    public static int getNumDimensions(Class<?> arrayType) {
+       return getNumDimensions(arrayType.getName());
+    }
+
+    public static int getNumDimensions(String arrayName) {
+        int i = 0;
+        while (arrayName.charAt(i) == '[') {
+            i++;
+        }
+        return i;
+    }
+
+    public static String createArrayType(String componentType, int[] dimensions) {
+        StringBuilder s = new StringBuilder();
+        s.append("[".repeat(dimensions.length));
+        boolean isObject = !componentType.startsWith("[") && componentType.contains("/");
+        if (isObject) {
+            s.append("L");
+            s.append(componentType);
+        } else {
+            s.append(Java.mapPrimitiveOrArrayName(componentType));
+        }
+        if (isObject) {
+            s.append(";");
+        }
+        return s.toString();
+    }
 }

src/main/java/com/github/shautvast/rusty/Result.java

@@ -65,4 +65,8 @@ public class Result<T> {
             return new Result<>(null, error);
         }
     }
+
+    public boolean isOk() {
+        return error == null;
+    }
 }

src/test/java/com/github/shautvast/reflective/DummyInvoker.java

@@ -1,9 +0,0 @@
-package com.github.shautvast.reflective;
-
-public class DummyInvoker extends AbstractInvoker {
-
-    public Object invoke(Object instance, Object... arguments) {
-        ((ReflectiveTest.Dummy) instance).setName((String)arguments[0]);
-        return null;
-    }
-}

src/test/java/com/github/shautvast/reflective/ReflectiveTest.java

@@ -1,11 +1,14 @@
 package com.github.shautvast.reflective;
 
 import com.github.shautvast.rusty.Panic;
+import com.github.shautvast.rusty.Result;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.Setter;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
 
 import java.lang.reflect.Modifier;
-import java.util.Iterator;
 import java.util.List;
 import java.util.Set;
 
@@ -15,17 +18,13 @@ public class ReflectiveTest {
 
     @Test
     void testMethods() {
-        Dummy dummy = new Dummy("bar");
+        Dummy dummy = getDummy();
         MetaClass metaDummy = Reflective.getMetaClass(dummy.getClass());
         assertEquals("com.github.shautvast.reflective.ReflectiveTest$Dummy", metaDummy.getName());
 
-        Iterator<MetaField> fields = metaDummy.getFields().iterator();
-        assertTrue(fields.hasNext());
-        assertEquals("name", fields.next().getName());
-
         Set<MetaMethod> methods = metaDummy.getMethods();
         assertFalse(methods.isEmpty());
-        assertEquals(5, methods.size());
+        assertEquals(22, methods.size());
 
         MetaMethod equals = metaDummy.getMethod("equals").orElseGet(Assertions::fail);
         assertEquals(boolean.class, equals.getReturnParameter().getType());
@@ -36,10 +35,10 @@ public class ReflectiveTest {
         assertEquals(int.class, hashCode.getReturnParameter().getType());
         assertTrue(Modifier.isPublic(hashCode.getModifiers()));
 
-        MetaMethod getName = metaDummy.getMethod("getName").orElseGet(Assertions::fail);
+        MetaMethod getStringValue = metaDummy.getMethod("getStringValue").orElseGet(Assertions::fail);
-        assertEquals(List.of(), getName.getParameters());
+        assertEquals(List.of(), getStringValue.getParameters());
-        assertEquals(String.class, getName.getReturnParameter().getType());
+        assertEquals(String.class, getStringValue.getReturnParameter().getType());
-        assertTrue(Modifier.isPublic(getName.getModifiers()));
+        assertTrue(Modifier.isPublic(getStringValue.getModifiers()));
 
         MetaMethod privateMethod = metaDummy.getMethod("privateMethod").orElseGet(Assertions::fail);
         assertEquals(List.of(), privateMethod.getParameters());
@@ -50,39 +49,89 @@ public class ReflectiveTest {
 
     @Test
     void testInvokeGetter() {
-        Dummy dummy = new Dummy("bar");
+        Dummy dummy = getDummy();
-        MetaMethod getName = Reflective.getMetaClass(dummy.getClass()).getMethod("getName").orElseGet(Assertions::fail);
+        MetaMethod getStringValue = Reflective.getMetaClass(dummy.getClass()).getMethod("getStringValue").orElseGet(Assertions::fail);
 
-        assertThrows(Panic.class, () -> getName.invoke("foo").unwrap());
+        // passing "foo" as the instance is not allowed
-        assertEquals("bar", getName.invoke(dummy).unwrap());
+        assertThrows(Panic.class, () -> getStringValue.invoke("foo").unwrap());
+        // we should pass a valid dummy instance
+        assertEquals("don't panic!", getStringValue.invoke(dummy).unwrap());
     }
 
     @Test
-    void testInvokeSetter() {
+    void testInvokeSetters() {
-        Dummy dummy = new Dummy("bar");
+        Dummy dummy = getDummy();
         MetaClass metaForClass = Reflective.getMetaClass(dummy.getClass());
-        MetaMethod setName = metaForClass.getMethod("setName").orElseGet(Assertions::fail);
 
-        assertEquals("bar", dummy.getName()); // before invoke
+        MetaMethod setByte = metaForClass.getMethod("setByteValue").orElseGet(Assertions::fail);
-        setName.invoke(dummy, "foo");
+        setByte.invoke(dummy, (byte) -42).unwrap();
-        assertEquals("foo", dummy.getName()); // after invoke
+        assertEquals((byte) -42, dummy.getByteValue());
+
+        MetaMethod setShort = metaForClass.getMethod("setShortValue").orElseGet(Assertions::fail);
+        setShort.invoke(dummy, (short) -43).unwrap();
+        assertEquals((short) -43, dummy.getShortValue());
+
+        MetaMethod setInt = metaForClass.getMethod("setIntValue").orElseGet(Assertions::fail);
+        setInt.invoke(dummy, -44).unwrap();
+        assertEquals(-44, dummy.getIntValue());
+
+        MetaMethod setLongValue = metaForClass.getMethod("setLongValue").orElseGet(Assertions::fail);
+        setLongValue.invoke(dummy, -45L).unwrap();
+        assertEquals(-45L, dummy.getLongValue());
+
+        MetaMethod setFloat = metaForClass.getMethod("setFloatValue").orElseGet(Assertions::fail);
+        setFloat.invoke(dummy, -46.0F).unwrap();
+        assertEquals(-46.0F, dummy.getFloatValue());
+
+        MetaMethod setDouble = metaForClass.getMethod("setDoubleValue").orElseGet(Assertions::fail);
+        setDouble.invoke(dummy, -47.0).unwrap();
+        assertEquals(-47.0, dummy.getDoubleValue());
+
+        MetaMethod setChar = metaForClass.getMethod("setCharValue").orElseGet(Assertions::fail);
+        setChar.invoke(dummy, '-').unwrap();
+        assertEquals('-', dummy.getCharValue());
+
+        MetaMethod setBoolean = metaForClass.getMethod("setBooleanValue").orElseGet(Assertions::fail);
+        setBoolean.invoke(dummy, false).unwrap();
+        assertFalse(dummy.isBooleanValue());
+
+        MetaMethod setString = metaForClass.getMethod("setStringValue").orElseGet(Assertions::fail);
+        setString.invoke(dummy, "panic!").unwrap();
+        assertEquals("panic!", dummy.getStringValue());
     }
 
+    @Test
+    void testInvocationExceptionHappened() {
+        Dummy dummy = getDummy();
+        MetaClass metaForClass = Reflective.getMetaClass(dummy.getClass());
+        MetaMethod throwEx = metaForClass.getMethod("throwEx").orElseGet(Assertions::fail);
 
+        Result<Void> result = throwEx.invoke(dummy, "foo");
+        assertFalse(result.isOk());
+    }
+
+    private static Dummy getDummy() {
+        return new Dummy((byte) 42, (short) 43,
+                44, 45, 46.0F, 47.0,
+                'D', true, "don't panic!",
+                new byte[1][1], new String[]{"Please don't touch that button"});
+    }
+
+    @Getter
+    @Setter
+    @AllArgsConstructor
     public static class Dummy {
-        private String name;
+        private byte byteValue;
-
+        private short shortValue;
-        public Dummy(String name) {
+        private int intValue;
-            this.name = name;
+        private long longValue;
-        }
+        private float floatValue;
-
+        private double doubleValue;
-        public String getName() {
+        private char charValue;
-            return privateMethod()[0];
+        private boolean booleanValue;
-        }
+        private String stringValue;
-
+        private byte[][] byteArrayValue;
-        public void setName(String name) {
+        private String[] stringArrayValue;
-            this.name = name;
-        }
 
         @Override
         public boolean equals(Object obj) {
@@ -94,8 +143,14 @@ public class ReflectiveTest {
             return 6;
         }
 
+        @SuppressWarnings("unused")
         private String[] privateMethod() {
-            return new String[]{name, "bar"};
+            return new String[1];
+        }
+
+        @SuppressWarnings("unused")
+        public void throwEx() {
+            throw new RuntimeException("ex");
         }
     }
 }

src/test/java/com/github/shautvast/reflective/array/ArrayFactoryTest.java

@@ -0,0 +1,174 @@
+package com.github.shautvast.reflective.array;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class ArrayFactoryTest {
+
+    @Test
+    void testCreate1DimShortArray() {
+        Object o = ArrayFactory.newInstance(short.class, 1);
+        assertTrue(o instanceof short[]);
+    }
+
+    @Test
+    void testCreate2DimIntArray() {
+        int[][] ints = (int[][]) ArrayFactory.newInstance(int[].class, 1);
+        assertEquals(1, ints.length);
+        ints[0] = new int[1]; // will fail if array is not correctly created
+        assertEquals(1, ints[0].length);
+    }
+
+    @Test
+    void testCreate3DimStringArray() {
+        String[][][] array = (String[][][]) ArrayFactory.newInstance(String.class, 6, 7, 8);
+        assertEquals(6, array.length);
+        assertEquals(7, array[0].length);
+        assertEquals(8, array[0][0].length);
+    }
+
+    @Test
+    void testSetObject() {
+        String[] strings = new String[1];
+        ArrayFactory.set(strings, 0, "helloworld");
+        assertArrayEquals(new String[]{"helloworld"}, strings);
+    }
+
+    @Test
+    void testSetInt() {
+        int[] ints = new int[1];
+        ArrayFactory.setInt(ints, 0, 11);
+        assertArrayEquals(new int[]{11}, ints);
+    }
+
+    @Test
+    void testSetByte() {
+        byte[] bytes = new byte[1];
+        ArrayFactory.setByte(bytes, 0, (byte) 11);
+        assertArrayEquals(new byte[]{11}, bytes);
+    }
+
+    @Test
+    void testSetShort() {
+        short[] shorts = new short[1];
+        ArrayFactory.setShort(shorts, 0, (short) 11);
+        assertArrayEquals(new short[]{11}, shorts);
+    }
+
+    @Test
+    void testSetLong() {
+        long[] longs = new long[1];
+        ArrayFactory.setLong(longs, 0, 11L);
+        assertArrayEquals(new long[]{11}, longs);
+    }
+
+    @Test
+    void testSetFloat() {
+        float[] floats = new float[1];
+        ArrayFactory.setFloat(floats, 0, 11.1F);
+        assertArrayEquals(new float[]{11.1F}, floats);
+    }
+
+    @Test
+    void testSetDouble() {
+        double[] doubles = new double[1];
+        ArrayFactory.setDouble(doubles, 0, 11.1D);
+        assertArrayEquals(new double[]{11.1D}, doubles);
+    }
+
+    @Test
+    void testSetBoolean() {
+        boolean[] booleans = new boolean[]{false};
+        ArrayFactory.setBoolean(booleans, 0, true);
+        assertArrayEquals(new boolean[]{true}, booleans);
+    }
+
+    @Test
+    void testSetChar() {
+        char[] chars = new char[]{'C'};
+        ArrayFactory.setChar(chars, 0, 'D');
+        assertArrayEquals(new char[]{'D'}, chars);
+    }
+
+    @Test
+    void testGetFromObjectArray() {
+        String[] strings = new String[]{"helloworld"};
+        Object o = ArrayFactory.get(strings, 0);
+        assertTrue(o instanceof String);
+        String string = (String) o;
+        assertEquals("helloworld", string);
+    }
+
+    @Test
+    void testGetFromByteArray() {
+        byte[] bytes = new byte[]{17};
+        byte b = ArrayFactory.getByte(bytes, 0);
+        assertEquals(17, b);
+    }
+
+    @Test
+    void testGetFromShortArray() {
+        short[] shorts = new short[]{17};
+        short s = ArrayFactory.getShort(shorts, 0);
+        assertEquals(17, s);
+    }
+
+    @Test
+    void testGetFromIntArray() {
+        int[] ints = new int[]{17};
+        int i = ArrayFactory.getInt(ints, 0);
+        assertEquals(17, i);
+    }
+
+    @Test
+    void testGetFromLongArray() {
+        long[] longs = new long[]{17};
+        long l = ArrayFactory.getLong(longs, 0);
+        assertEquals(17, l);
+    }
+
+    @Test
+    void testGetFromCharArray() {
+        char[] chars = new char[]{17};
+        char c = ArrayFactory.getChar(chars, 0);
+        assertEquals(17, c);
+    }
+
+    @Test
+    void testGetFromBooleanArray() {
+        boolean[] booleans = new boolean[]{true};
+        boolean b = ArrayFactory.getBoolean(booleans, 0);
+        assertEquals(true, b);
+    }
+
+    @Test
+    void testGetFromFloatArray() {
+        float[] floats = new float[]{17.5F};
+        float f = ArrayFactory.getFloat(floats, 0);
+        assertEquals(17.5, f);
+    }
+
+    @Test
+    void testGetFromDoubleArray() {
+        double[] doubles = new double[]{17.5F};
+        double d = ArrayFactory.getDouble(doubles, 0);
+        assertEquals(17.5, d);
+    }
+
+    @Test
+    void arrayIndexOutOfBoundsException() {
+        double[] doubles = new double[]{};
+        assertThrows(ArrayIndexOutOfBoundsException.class, () -> ArrayFactory.getDouble(doubles, 0));
+    }
+
+    @Test
+    void notAnArray() {
+        assertThrows(IllegalArgumentException.class, () -> ArrayFactory.get("foo", 0));
+    }
+
+    @Test
+    void arrayIsNull() {
+        assertThrows(NullPointerException.class, () -> ArrayFactory.get(null, 0));
+    }
+}