public static void mixinClassesToMetaClass(MetaClass self, List<Class> categoryClasses) { final Class selfClass = self.getTheClass(); if (self instanceof HandleMetaClass) { self = (MetaClass) ((HandleMetaClass) self).replaceDelegate(); } if (!(self instanceof ExpandoMetaClass)) { if (self instanceof DelegatingMetaClass && ((DelegatingMetaClass) self).getAdaptee() instanceof ExpandoMetaClass) { self = ((DelegatingMetaClass) self).getAdaptee(); } else { throw new GroovyRuntimeException("Can't mixin methods to meta class: " + self); } } ExpandoMetaClass mc = (ExpandoMetaClass) self; List<MetaMethod> arr = new ArrayList<MetaMethod>(); for (Class categoryClass : categoryClasses) { final CachedClass cachedCategoryClass = ReflectionCache.getCachedClass(categoryClass); final MixinInMetaClass mixin = new MixinInMetaClass(mc, cachedCategoryClass); final MetaClass metaClass = GroovySystem.getMetaClassRegistry().getMetaClass(categoryClass); final List<MetaProperty> propList = metaClass.getProperties(); for (MetaProperty prop : propList) if (self.getMetaProperty(prop.getName()) == null) { mc.registerBeanProperty(prop.getName(), new MixinInstanceMetaProperty(prop, mixin)); } for (MetaProperty prop : cachedCategoryClass.getFields()) if (self.getMetaProperty(prop.getName()) == null) { mc.registerBeanProperty(prop.getName(), new MixinInstanceMetaProperty(prop, mixin)); } for (MetaMethod method : metaClass.getMethods()) { final int mod = method.getModifiers(); if (!Modifier.isPublic(mod)) continue; if (method instanceof CachedMethod && ((CachedMethod) method).getCachedMethod().isSynthetic()) continue; if (Modifier.isStatic(mod)) { if (method instanceof CachedMethod) staticMethod(self, arr, (CachedMethod) method); } else if (method.getDeclaringClass().getTheClass() != Object.class || method.getName().equals("toString")) { // if (self.pickMethod(method.getName(), // method.getNativeParameterTypes()) == null) { final MixinInstanceMetaMethod metaMethod = new MixinInstanceMetaMethod(method, mixin); arr.add(metaMethod); // } } } } for (Object res : arr) { final MetaMethod metaMethod = (MetaMethod) res; if (metaMethod.getDeclaringClass().isAssignableFrom(selfClass)) mc.registerInstanceMethod(metaMethod); else { mc.registerSubclassInstanceMethod(metaMethod); } } }