diff options
Diffstat (limited to 'src/Java/gtPlusPlus/core/util')
| -rw-r--r-- | src/Java/gtPlusPlus/core/util/reflect/ReflectionUtils.java | 202 |
1 files changed, 176 insertions, 26 deletions
diff --git a/src/Java/gtPlusPlus/core/util/reflect/ReflectionUtils.java b/src/Java/gtPlusPlus/core/util/reflect/ReflectionUtils.java index 722a4f3ff7..c86d6ccb83 100644 --- a/src/Java/gtPlusPlus/core/util/reflect/ReflectionUtils.java +++ b/src/Java/gtPlusPlus/core/util/reflect/ReflectionUtils.java @@ -3,10 +3,17 @@ package gtPlusPlus.core.util.reflect; import java.io.IOException; import java.lang.reflect.Constructor; import java.lang.reflect.Field; +import java.lang.reflect.GenericDeclaration; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.lang.reflect.Modifier; +import java.lang.reflect.ParameterizedType; +import java.lang.reflect.Type; +import java.lang.reflect.TypeVariable; +import java.util.HashMap; import java.util.LinkedHashMap; +import java.util.LinkedList; +import java.util.List; import java.util.Map; import org.apache.commons.lang3.ArrayUtils; @@ -133,8 +140,8 @@ public class ReflectionUtils { public static Method getMethod(Object aObject, String aMethodName, Class[] aTypes) { return getMethod(aObject.getClass(), aMethodName, aTypes); } - - + + /** * Returns a cached {@link Method} object. * @param aClass - Class containing the Method. @@ -193,7 +200,7 @@ public class ReflectionUtils { return y.get(); } } - + /** * Returns a cached {@link Field} object. * @param aInstance - {@link Object} to get the field instance from. @@ -219,6 +226,20 @@ public class ReflectionUtils { return isClassPresent(classname); } + + /** + * Returns the class of the objects type parameter + * @param o - Object to examine paramters on + * @return - a Class<?> or null + */ + public static Class<?> getTypeOfGenericObject(Object o) { + Class<?> aTypeParam = findSuperClassParameterType(o, o.getClass(), 0); + if (aTypeParam == null) { + aTypeParam = findSubClassParameterType(o, o.getClass(), 0); + } + return aTypeParam; + } + public static void makeFieldAccessible(final Field field) { if (!Modifier.isPublic(field.getModifiers()) || !Modifier.isPublic(field.getDeclaringClass().getModifiers())) @@ -271,7 +292,7 @@ public class ReflectionUtils { return loaded > 0; } - + public static boolean setField(final Object object, final String fieldName, final Object fieldValue) { Class<?> clazz = object.getClass(); @@ -414,13 +435,27 @@ public class ReflectionUtils { - - - - - - - + + + + + + + + + + + + + + + + + + /* + * Internal Magic that probably should not get exposed. + */ + @@ -429,11 +464,126 @@ public class ReflectionUtils { + /* + * + * Below Code block is used for determining generic types associated with type<E> + * + */ + + + //https://xebia.com/blog/acessing-generic-types-at-runtime-in-java/ + //https://www.javacodegeeks.com/2013/12/advanced-java-generics-retreiving-generic-type-arguments.html + public static Class<?> findSuperClassParameterType(Object instance, Class<?> classOfInterest, int parameterIndex) { + Class<?> subClass = instance.getClass(); + while (classOfInterest != subClass.getSuperclass()) { + // instance.getClass() is no subclass of classOfInterest or instance is a direct instance of classOfInterest + subClass = subClass.getSuperclass(); + if (subClass == null) { + return null; + } + } + ParameterizedType parameterizedType = (ParameterizedType) subClass.getGenericSuperclass(); + Class<?> aReturn; + aReturn = (Class<?>) parameterizedType.getActualTypeArguments()[parameterIndex]; + return aReturn; + } + + public static Class<?> findSubClassParameterType(Object instance, Class<?> classOfInterest, int parameterIndex) { + Map<Type, Type> typeMap = new HashMap<Type, Type>(); + Class<?> instanceClass = instance.getClass(); + while (classOfInterest != instanceClass.getSuperclass()) { + extractTypeArguments(typeMap, instanceClass); + instanceClass = instanceClass.getSuperclass(); + if (instanceClass == null) { + return null; + } + } + + ParameterizedType parameterizedType = (ParameterizedType) instanceClass.getGenericSuperclass(); + Type actualType = parameterizedType.getActualTypeArguments()[parameterIndex]; + if (typeMap.containsKey(actualType)) { + actualType = typeMap.get(actualType); + } + if (actualType instanceof Class) { + return (Class<?>) actualType; + } else if (actualType instanceof TypeVariable) { + return browseNestedTypes(instance, (TypeVariable<?>) actualType); + } else { + return null; + } + } + + private static void extractTypeArguments(Map<Type, Type> typeMap, Class<?> clazz) { + Type genericSuperclass = clazz.getGenericSuperclass(); + if (!(genericSuperclass instanceof ParameterizedType)) { + return; + } + + ParameterizedType parameterizedType = (ParameterizedType) genericSuperclass; + Type[] typeParameter = ((Class<?>) parameterizedType.getRawType()).getTypeParameters(); + Type[] actualTypeArgument = parameterizedType.getActualTypeArguments(); + for (int i = 0; i < typeParameter.length; i++) { + if(typeMap.containsKey(actualTypeArgument[i])) { + actualTypeArgument[i] = typeMap.get(actualTypeArgument[i]); + } + typeMap.put(typeParameter[i], actualTypeArgument[i]); + } + } + + private static Class<?> browseNestedTypes(Object instance, TypeVariable<?> actualType) { + Class<?> instanceClass = instance.getClass(); + List<Class<?>> nestedOuterTypes = new LinkedList<Class<?>>(); + for (Class<?> enclosingClass = instanceClass + .getEnclosingClass(); enclosingClass != null; enclosingClass = enclosingClass.getEnclosingClass()) { + try { + Field this$0 = instanceClass.getDeclaredField("this$0"); + Object outerInstance = this$0.get(instance); + Class<?> outerClass = outerInstance.getClass(); + nestedOuterTypes.add(outerClass); + Map<Type, Type> outerTypeMap = new HashMap<Type, Type>(); + extractTypeArguments(outerTypeMap, outerClass); + for (Map.Entry<Type, Type> entry : outerTypeMap.entrySet()) { + if (!(entry.getKey() instanceof TypeVariable)) { + continue; + } + TypeVariable<?> foundType = (TypeVariable<?>) entry.getKey(); + if (foundType.getName().equals(actualType.getName()) + && isInnerClass(foundType.getGenericDeclaration(), actualType.getGenericDeclaration())) { + if (entry.getValue() instanceof Class) { + return (Class<?>) entry.getValue(); + } + actualType = (TypeVariable<?>) entry.getValue(); + } + } + } catch (NoSuchFieldException | IllegalAccessException e) { + + } + + } + return null; + } + + private static boolean isInnerClass(GenericDeclaration outerDeclaration, GenericDeclaration innerDeclaration) { + if (!(outerDeclaration instanceof Class) || !(innerDeclaration instanceof Class)) { + return false; + } + Class<?> outerClass = (Class<?>) outerDeclaration; + Class<?> innerClass = (Class<?>) innerDeclaration; + while ((innerClass = innerClass.getEnclosingClass()) != null) { + if (innerClass == outerClass) { + return true; + } + } + return false; + } /* - * Internal Magic that probably should not get exposed. - */ + * + * End of Generics Block + * + */ + private static Field getField_Internal(final Class<?> clazz, final String fieldName) throws NoSuchFieldException { @@ -525,26 +675,26 @@ public class ReflectionUtils { return getMethod_Internal(superClass, aMethodName); } } - + private static void dumpClassInfo(Class aClass) { Logger.INFO("We ran into an error processing reflection in "+aClass.getName()+", dumping all data for debugging."); // Get the methods - Method[] methods = aClass.getDeclaredMethods(); - Field[] fields = aClass.getDeclaredFields(); - Constructor[] consts = aClass.getDeclaredConstructors(); + Method[] methods = aClass.getDeclaredMethods(); + Field[] fields = aClass.getDeclaredFields(); + Constructor[] consts = aClass.getDeclaredConstructors(); Logger.INFO("Dumping all Methods."); - for (Method method : methods) { - System.out.println(method.getName()+" | "+StringUtils.getDataStringFromArray(method.getParameterTypes())); - } + for (Method method : methods) { + System.out.println(method.getName()+" | "+StringUtils.getDataStringFromArray(method.getParameterTypes())); + } Logger.INFO("Dumping all Fields."); - for (Field f : fields) { - System.out.println(f.getName()); - } + for (Field f : fields) { + System.out.println(f.getName()); + } Logger.INFO("Dumping all Constructors."); - for (Constructor c : consts) { - System.out.println(c.getName()+" | "+c.getParameterCount()+" | "+StringUtils.getDataStringFromArray(c.getParameterTypes())); - } + for (Constructor c : consts) { + System.out.println(c.getName()+" | "+c.getParameterCount()+" | "+StringUtils.getDataStringFromArray(c.getParameterTypes())); + } } private static Class<?> getNonPublicClass(final String className) { |