Allowed converter overrides from outside

src/main/java/com/cedarsoftware/util/ClassUtilities.java

@@ -40,6 +40,7 @@ public class ClassUtilities
 {
     private static final Set<Class<?>> prims = new HashSet<>();
 
+    private static final Map<Class<?>, Class<?>> primitiveToWrapper = new HashMap<>(20, .8f);
     private static final Map<String, Class<?>> nameToClass = new HashMap<>();
 
     static
@@ -65,6 +66,16 @@ public class ClassUtilities
         nameToClass.put("date", Date.class);
         nameToClass.put("class", Class.class);
 
+        primitiveToWrapper.put(int.class, Integer.class);
+        primitiveToWrapper.put(long.class, Long.class);
+        primitiveToWrapper.put(double.class, Double.class);
+        primitiveToWrapper.put(float.class, Float.class);
+        primitiveToWrapper.put(boolean.class, Boolean.class);
+        primitiveToWrapper.put(char.class, Character.class);
+        primitiveToWrapper.put(byte.class, Byte.class);
+        primitiveToWrapper.put(short.class, Short.class);
+        primitiveToWrapper.put(void.class, Void.class);
+
     }
 
     /**
@@ -307,4 +318,20 @@ public static boolean areAllConstructorsPrivate(Class<?> c) {
 
         return true;
     }
+
+    public static Class<?> toPrimitiveWrapperClass(Class<?> primitiveClass) {
+        if (!primitiveClass.isPrimitive()) {
+            return primitiveClass;
+        }
+
+        Class<?> c = primitiveToWrapper.get(primitiveClass);
+
+        if (c == null) {
+            throw new IllegalArgumentException("Passed in class: " + primitiveClass + " is not a primitive class");
+        }
+
+        return c;
+    }
+
+
 }

src/main/java/com/cedarsoftware/util/convert/Converter.java

@@ -23,7 +23,6 @@
 import java.util.AbstractMap;
 import java.util.Calendar;
 import java.util.Date;
-import java.util.HashMap;
 import java.util.Map;
 import java.util.Set;
 import java.util.TreeMap;
@@ -35,6 +34,8 @@
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.AtomicLong;
 
+import com.cedarsoftware.util.ClassUtilities;
+
 /**
  * Instance conversion utility.  Convert from primitive to other primitives, plus support for Number, Date,
  * TimeStamp, SQL Date, LocalDate, LocalDateTime, ZonedDateTime, Calendar, Big*, Atomic*, Class, UUID,
@@ -78,7 +79,6 @@ public final class Converter {
     private final ConverterOptions options;
 
     private static final Map<Class<?>, Set<ClassLevel>> cacheParentTypes = new ConcurrentHashMap<>();
-    private static final Map<Class<?>, Class<?>> primitiveToWrapper = new HashMap<>(20, .8f);
     private static final Map<Map.Entry<Class<?>, Class<?>>, Convert<?>> CONVERSION_DB = new ConcurrentHashMap<>(500, .8f);
 
     // Create a Map.Entry (pair) of source class to target class.
@@ -87,26 +87,13 @@ static Map.Entry<Class<?>, Class<?>> pair(Class<?> source, Class<?> target) {
     }
 
     static {
-        buildPrimitiveWrappers();
         buildFactoryConversions();
     }
 
     public ConverterOptions getOptions() {
         return options;
     }
 
-    private static void buildPrimitiveWrappers() {
-        primitiveToWrapper.put(int.class, Integer.class);
-        primitiveToWrapper.put(long.class, Long.class);
-        primitiveToWrapper.put(double.class, Double.class);
-        primitiveToWrapper.put(float.class, Float.class);
-        primitiveToWrapper.put(boolean.class, Boolean.class);
-        primitiveToWrapper.put(char.class, Character.class);
-        primitiveToWrapper.put(byte.class, Byte.class);
-        primitiveToWrapper.put(short.class, Short.class);
-        primitiveToWrapper.put(void.class, Void.class);
-    }
-
     private static void buildFactoryConversions() {
         // toByte
         CONVERSION_DB.put(pair(Void.class, byte.class), NumberConversions::toByteZero);
@@ -859,6 +846,7 @@ private static void buildFactoryConversions() {
     public Converter(ConverterOptions options) {
         this.options = options;
         this.factory = new ConcurrentHashMap<>(CONVERSION_DB);
+        this.factory.putAll(this.options.getConverterOverrides());
     }
 
     /**
@@ -901,7 +889,7 @@ public <T> T convert(Object from, Class<T> toType) {
             // Promote primitive to primitive wrapper, so we don't have to define so many duplicates in the factory map.
             sourceType = from.getClass();
             if (toType.isPrimitive()) {
-                toType = (Class<T>) toPrimitiveWrapperClass(toType);
+                toType = (Class<T>)  ClassUtilities.toPrimitiveWrapperClass(toType);
             }
         }
 
@@ -1038,8 +1026,8 @@ static private String name(Object from) {
      * @return boolean true if the Converter converts from the source type to the destination type, false otherwise.
      */
     boolean isDirectConversionSupportedFor(Class<?> source, Class<?> target) {
-        source = toPrimitiveWrapperClass(source);
-        target = toPrimitiveWrapperClass(target);
+        source =  ClassUtilities.toPrimitiveWrapperClass(source);
+        target =  ClassUtilities.toPrimitiveWrapperClass(target);
         Convert<?> method = factory.get(pair(source, target));
         return method != null && method != UNSUPPORTED;
     }
@@ -1052,8 +1040,8 @@ boolean isDirectConversionSupportedFor(Class<?> source, Class<?> target) {
      * @return boolean true if the Converter converts from the source type to the destination type, false otherwise.
      */
     public boolean isConversionSupportedFor(Class<?> source, Class<?> target) {
-        source = toPrimitiveWrapperClass(source);
-        target = toPrimitiveWrapperClass(target);
+        source =  ClassUtilities.toPrimitiveWrapperClass(source);
+        target =  ClassUtilities.toPrimitiveWrapperClass(target);
         Convert<?> method = factory.get(pair(source, target));
         if (method != null && method != UNSUPPORTED) {
             return true;
@@ -1104,28 +1092,14 @@ public Map<String, Set<String>> getSupportedConversions() {
      * @return prior conversion function if one existed.
      */
     public Convert<?> addConversion(Class<?> source, Class<?> target, Convert<?> conversionFunction) {
-        source = toPrimitiveWrapperClass(source);
-        target = toPrimitiveWrapperClass(target);
+        source = ClassUtilities.toPrimitiveWrapperClass(source);
+        target = ClassUtilities.toPrimitiveWrapperClass(target);
         return factory.put(pair(source, target), conversionFunction);
     }
-    
+
     /**
      * Given a primitive class, return the Wrapper class equivalent.
      */
-    static Class<?> toPrimitiveWrapperClass(Class<?> primitiveClass) {
-        if (!primitiveClass.isPrimitive()) {
-            return primitiveClass;
-        }
-
-        Class<?> c = primitiveToWrapper.get(primitiveClass);
-
-        if (c == null) {
-            throw new IllegalArgumentException("Passed in class: " + primitiveClass + " is not a primitive class");
-        }
-
-        return c;
-    }
-
     private static <T> T identity(T from, Converter converter) {
         return from;
     }

src/main/java/com/cedarsoftware/util/convert/ConverterOptions.java

@@ -5,7 +5,9 @@
 import java.time.LocalDate;
 import java.time.LocalDateTime;
 import java.time.ZoneId;
+import java.util.HashMap;
 import java.util.Locale;
+import java.util.Map;
 import java.util.TimeZone;
 
 /**
@@ -68,4 +70,10 @@ public interface ConverterOptions {
      * @return the Character representing false
      */
     default Character falseChar() { return CommonValues.CHARACTER_ZERO; }
+
+    /**
+     * Overrides for converter conversions..
+     * @return The Map of overrides.
+     */
+    default Map<Map.Entry<Class<?>, Class<?>>, Convert<?>> getConverterOverrides() { return new HashMap<>(); }
 }

src/main/java/com/cedarsoftware/util/convert/DefaultConverterOptions.java

@@ -1,9 +1,5 @@
 package com.cedarsoftware.util.convert;
 
-import java.nio.charset.Charset;
-import java.nio.charset.StandardCharsets;
-import java.time.ZoneId;
-import java.util.Locale;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
@@ -28,13 +24,19 @@ public class DefaultConverterOptions implements ConverterOptions {
 
     private final Map<String, Object> customOptions;
 
+    private final Map<Map.Entry<Class<?>, Class<?>>, Convert<?>> converterOverrides;
+
     public DefaultConverterOptions() {
         this.customOptions = new ConcurrentHashMap<>();
+        this.converterOverrides = new ConcurrentHashMap<>();
     }
 
     @SuppressWarnings("unchecked")
     @Override
     public <T> T getCustomOption(String name) {
         return (T) this.customOptions.get(name);
     }
+
+    @Override
+    public Map<Map.Entry<Class<?>, Class<?>>, Convert<?>> getConverterOverrides() { return this.converterOverrides; }
 }

src/test/java/com/cedarsoftware/util/convert/ConverterEverythingTest.java

@@ -43,6 +43,8 @@
 import org.junit.jupiter.params.provider.Arguments;
 import org.junit.jupiter.params.provider.MethodSource;
 
+import com.cedarsoftware.util.ClassUtilities;
+
 import static com.cedarsoftware.util.MapUtilities.mapOf;
 import static com.cedarsoftware.util.convert.Converter.getShortName;
 import static com.cedarsoftware.util.convert.Converter.pair;
@@ -1676,9 +1678,9 @@ void testConvert(String shortNameSource, String shortNameTarget, Object source,
         if (source == null) {
             assertEquals(sourceClass, Void.class, "On the source-side of test input, null can only appear in the Void.class data");
         } else {
-            assertTrue(Converter.toPrimitiveWrapperClass(sourceClass).isInstance(source), "source type mismatch");
+            assertTrue(ClassUtilities.toPrimitiveWrapperClass(sourceClass).isInstance(source), "source type mismatch");
         }
-        assertTrue(target == null || target instanceof Throwable || Converter.toPrimitiveWrapperClass(targetClass).isInstance(target), "target type mismatch");
+        assertTrue(target == null || target instanceof Throwable || ClassUtilities.toPrimitiveWrapperClass(targetClass).isInstance(target), "target type mismatch");
 
         // if the source/target are the same Class, then ensure identity lambda is used.
         if (sourceClass.equals(targetClass)) {