improvements

lib/src/main/java/nl/sanderhautvast/contiguous/BigDecimalHandler.java

@@ -0,0 +1,21 @@
+package nl.sanderhautvast.contiguous;
+
+import java.lang.invoke.MethodHandle;
+import java.math.BigDecimal;
+import java.math.BigInteger;
+
+class BigDecimalHandler extends PrimitiveType<BigDecimal> {
+    public BigDecimalHandler(MethodHandle getter, MethodHandle setter) {
+        super(BigDecimal.class, getter, setter);
+    }
+
+    @Override
+    public void store(BigDecimal value, ContiguousList<?> list) {
+        list.storeString(value.toString());
+    }
+
+    @Override
+    public Object transform(Object value) {
+        return new BigDecimal((String) value);
+    }
+}

lib/src/main/java/nl/sanderhautvast/contiguous/BigIntegerHandler.java

@@ -0,0 +1,20 @@
+package nl.sanderhautvast.contiguous;
+
+import java.lang.invoke.MethodHandle;
+import java.math.BigInteger;
+
+class BigIntegerHandler extends PrimitiveType<BigInteger> {
+    public BigIntegerHandler(MethodHandle getter, MethodHandle setter) {
+        super(BigInteger.class, getter, setter);
+    }
+
+    @Override
+    public void store(BigInteger value, ContiguousList<?> list) {
+        list.storeString(value.toString());
+    }
+
+    @Override
+    public Object transform(Object value) {
+        return new BigInteger((String) value);
+    }
+}

lib/src/main/java/nl/sanderhautvast/contiguous/ContiguousList.java

@@ -22,9 +22,9 @@ import java.util.function.UnaryOperator;
  * <p>
  * Employs the SQLite style of data storage, most notably integer numbers are stored with variable byte length
  * <p>
- * The classes stored in DehydrateList MUST have a no-args constructor.
+ * The classes stored in {@link ContiguousList} MUST have a no-args constructor.
  * <p>
- * Like ArrayList mutating operations are not synchronized.
+ * Like ArrayList, mutating operations are not synchronized.
  * <p>
  * Does not allow null elements.
  * <p>
@@ -169,7 +169,7 @@ public class ContiguousList<E> implements List<E> {
         data.position(elementIndices[index]);
         try {
             if (type instanceof PrimitiveType<?>) {
-                return (E) ValueReader.read(data);
+                return (E)((PrimitiveType<?>)type).transform(ValueReader.read(data));
             }
             // create a new instance of the list element type
             E newInstance = (E) type.type.getDeclaredConstructor().newInstance();
@@ -187,7 +187,8 @@ public class ContiguousList<E> implements List<E> {
     private void setProperties(Object element, CompoundType compoundType) {
         compoundType.getProperties().forEach(property -> {
             if (property instanceof PrimitiveType) {
-                ((PrimitiveType<?>) property).setValue(element, ValueReader.read(data));
+                PrimitiveType<?> type =((PrimitiveType<?>) property);
+                type.setValue(element, ValueReader.read(data));
             } else {
                 try {
                     CompoundType p = (CompoundType) property;

lib/src/main/java/nl/sanderhautvast/contiguous/PrimitiveType.java

@@ -2,7 +2,7 @@ package nl.sanderhautvast.contiguous;
 
 import java.lang.invoke.MethodHandle;
 
-/*
+/**
  * Base class for handlers. Its responsibility is to read and write a property from the incoming object to the internal storage.
  *
  * Can be extended for types that you need to handle.
@@ -12,22 +12,6 @@ import java.lang.invoke.MethodHandle;
  * ie. when a bean is added or retrieved from the list
  */
 public abstract class PrimitiveType<T> extends Type {
-
-    /*
-     * Apology:
-     * This was the simplest thing I could think of when trying to accomodate for nested types.
-     *
-     * What you end up with after inspection in the DehydrateList is a flat list of getters and setters
-     * of properties that are in a tree-like structure (primitive properties within (nested) compound types)
-     * So to read or write a property in a 'root object' (element type in list) with compound property types
-     * you first have to traverse to the bean graph to the right container (bean) of the property you set/get
-     * (that is what the childGetters are for)
-     *
-     * Ideally you'd do this only once per containing class. In the current implementation it's once per
-     * property in the containing class.
-     */
-//    private final List<MethodHandle> childGetters = new ArrayList<>();
-
     public PrimitiveType(Class<?> type, MethodHandle getter, MethodHandle setter) {
         super(type, getter, setter);
     }
@@ -70,10 +54,23 @@ public abstract class PrimitiveType<T> extends Type {
      */
     public void setValue(Object instance, Object value) {
         try {
-            setter.invokeWithArguments(instance, value);
+            setter.invokeWithArguments(instance, transform(value));
         } catch (Throwable e) {
             throw new IllegalStateException(e);
         }
     }
 
+    /**
+     * Certain types can easily be stored as another known type, for instance
+     * a BigDecimal can be stored as a String.
+     *
+     * The {@link PrimitiveType} for BigDecimal would in that case be responsible for turning the String
+     * into a BigDecimal. It can do that by overriding this method
+     *
+     * @param value raw value to transform to the desired output type
+     * @return the transformed object
+     */
+    public Object transform(Object value){
+        return value;
+    }
 }

lib/src/main/java/nl/sanderhautvast/contiguous/PropertyHandlerFactory.java

@@ -2,6 +2,8 @@ package nl.sanderhautvast.contiguous;
 
 import java.lang.invoke.MethodHandle;
 import java.lang.reflect.InvocationTargetException;
+import java.math.BigDecimal;
+import java.math.BigInteger;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -15,23 +17,24 @@ final class PropertyHandlerFactory {
     }
 
     static {
-        STANDARD_HANDLERS.put(String.class, StringHandler.class);
-        STANDARD_HANDLERS.put(byte.class, ByteHandler.class);
-        STANDARD_HANDLERS.put(Byte.class, ByteHandler.class);
-        STANDARD_HANDLERS.put(int.class, IntegerHandler.class);
-        STANDARD_HANDLERS.put(Integer.class, IntegerHandler.class);
-        STANDARD_HANDLERS.put(short.class, ShortHandler.class);
-        STANDARD_HANDLERS.put(Short.class, ShortHandler.class);
-        STANDARD_HANDLERS.put(long.class, LongHandler.class);
-        STANDARD_HANDLERS.put(Long.class, LongHandler.class);
-        STANDARD_HANDLERS.put(float.class, FloatHandler.class);
-        STANDARD_HANDLERS.put(Float.class, FloatHandler.class);
-        STANDARD_HANDLERS.put(double.class, DoubleHandler.class);
-        STANDARD_HANDLERS.put(Double.class, DoubleHandler.class);
+        register(String.class, StringHandler.class);
+        register(byte.class, ByteHandler.class);
+        register(Byte.class, ByteHandler.class);
+        register(int.class, IntegerHandler.class);
+        register(Integer.class, IntegerHandler.class);
+        register(short.class, ShortHandler.class);
+        register(Short.class, ShortHandler.class);
+        register(long.class, LongHandler.class);
+        register(Long.class, LongHandler.class);
+        register(float.class, FloatHandler.class);
+        register(Float.class, FloatHandler.class);
+        register(double.class, DoubleHandler.class);
+        register(Double.class, DoubleHandler.class);
+        register(BigDecimal.class, StringHandler.class);
+        register(BigInteger.class, BigIntegerHandler.class);
+        register(BigDecimal.class, BigDecimalHandler.class);
         //Date/Timestamp
         //LocalDate/time
-        //BigDecimal
-        //BigInteger
     }
 
     public static boolean isKnownType(Class<?> type) {
@@ -55,4 +58,11 @@ final class PropertyHandlerFactory {
     public static <T> PrimitiveType<T> forType(Class<T> type) {
         return forType(type, null, null);
     }
+
+    /**
+     * register a new TypeHandler that cannot be derived from bean properties
+     */
+    public static void register(Class<?> type, Class<? extends PrimitiveType<?>> typehandler) {
+        STANDARD_HANDLERS.put(type, typehandler);
+    }
 }

lib/src/main/java/nl/sanderhautvast/contiguous/Type.java

@@ -2,8 +2,11 @@ package nl.sanderhautvast.contiguous;
 
 import java.lang.invoke.MethodHandle;
 
-/**
+/*
  * ok, sorry
+ *
+ * I needed to abstract over handlers for 'primitives' (ie. long, but also Long, String..=> built-in types) and compound types (your own)
+ * So this is the common ancestor. The respective functions are completely different.
  */
 public abstract class Type {
 

lib/src/test/java/nl/sanderhautvast/contiguous/ContiguousListTest.java

@@ -2,6 +2,7 @@ package nl.sanderhautvast.contiguous;
 
 import org.junit.jupiter.api.Test;
 
+import java.math.BigInteger;
 import java.util.List;
 
 import static org.junit.jupiter.api.Assertions.*;
@@ -129,5 +130,15 @@ public class ContiguousListTest {
             beanList.add(new StringBean(null));
         }
         assertEquals(100, beanList.size());
+        for (int i = 0; i < 100; i++) {
+            assertNull(beanList.get(i));
+        }
+    }
+
+    @Test
+    public void testBigInteger() {
+        ContiguousList<BigInteger> bigIntegers = new ContiguousList<>(BigInteger.class);
+        bigIntegers.add(new BigInteger("1000000000"));
+        assertEquals(1_000_000_000L, bigIntegers.get(0).longValue());
     }
 }