Examples of java.lang.reflect.TypeVariable

java.lang.reflect.TypeVariable
TypeVariable is the common superinterface for type variables of kinds. A type variable is created the first time it is needed by a reflective method, as specified in this package. If a type variable t is referenced by a type (i.e, class, interface or annotation type) T, and T is declared by the nth enclosing class of T (see JLS 8.1.2), then the creation of t requires the resolution (see JVMS 5) of the ith enclosing class of T, for i = 0 to n, inclusive. Creating a type variable must not cause the creation of its bounds. Repeated creation of a type variable has no effect.
Multiple objects may be instantiated at run-time to represent a given type variable. Even though a type variable is created only once, this does not imply any requirement to cache instances representing the type variable. However, all instances representing a type variable must be equal() to each other. As a consequence, users of type variables must not rely on the identity of instances of classes implementing this interface. @param < D> the type of generic declaration that declared theunderlying type variable. @since 1.5


      return typeDescription;
    }
    else if (type instanceof TypeVariable)
    {
      TypeVariable tType = (TypeVariable) type;
      String typeDescription = "type variable named " + tType.getName();


      typeDescription = typeDescription + " bounded by " + getTypeArrayDescription(tType.getBounds());
      return typeDescription;
    }
    return "Unknown";


  }

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         final Class<?> componentRawType = getRawType(genericArrayType.getGenericComponentType());
         return Array.newInstance(componentRawType, 0).getClass();
      }
      else if (type instanceof TypeVariable)
      {
         final TypeVariable typeVar = (TypeVariable) type;
         if (typeVar.getBounds() != null && typeVar.getBounds().length > 0)
         {
            return getRawType(typeVar.getBounds()[0]);
         }
      }
      throw new RuntimeException("Unable to determine base class from Type");
   }

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        getConcreteGeneric(pt.getRawType(), 0) : getConcreteGeneric(pt.getActualTypeArguments()[index], 0);
    } else if (type instanceof WildcardType) {
      WildcardType wt = (WildcardType) type;
      return wt.getUpperBounds().length <= index ? null : getConcreteGeneric(wt.getUpperBounds()[index], 0);
    } else if (type instanceof TypeVariable) {
      TypeVariable tt = (TypeVariable) type;
      return tt.getBounds().length <= index ? null : getConcreteGeneric(tt.getBounds()[index], 0);
    } else if (type instanceof GenericArrayType) {
      GenericArrayType gat = (GenericArrayType) type;
      return getConcreteGeneric(gat.getGenericComponentType(), index);
    } else if (type instanceof Class) {
      return (Class) type;

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            if (superType instanceof ParameterizedType)
            {
                ParameterizedType superPType = (ParameterizedType) superType;


                TypeVariable tv = (TypeVariable) genericType;


                String name = tv.getName();


                TypeVariable[] typeVariables = tv.getGenericDeclaration().getTypeParameters();


                for (int i = 0; i < typeVariables.length; i++)
                {
                    TypeVariable stv = typeVariables[i];


                    // We're trying to match the name of the type variable that is used as the return type
                    // of the method. With that name, we find the corresponding index in the
                    // type declarations. With the index, we check superPType for the Class instance
                    // that defines it. Generics has lots of other options that we simply can't handle.


                    if (stv.getName().equals(name))
                    {
                        Type actualType = superPType.getActualTypeArguments()[i];


                        if (actualType instanceof Class)
                            return (Class) actualType;

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  Type resolveType(Type toResolve) {
    // this implementation is made a little more complicated in an attempt to avoid object-creation
    while (true) {
      if (toResolve instanceof TypeVariable) {
        TypeVariable original = (TypeVariable) toResolve;
        toResolve = MoreTypes.resolveTypeVariable(type, rawType, original);
        if (toResolve == original) {
          return toResolve;
        }


      } else if (toResolve instanceof GenericArrayType) {
        GenericArrayType original = (GenericArrayType) toResolve;
        Type componentType = original.getGenericComponentType();
        Type newComponentType = resolveType(componentType);
        return componentType == newComponentType
            ? original
            : Types.arrayOf(newComponentType);


      } else if (toResolve instanceof ParameterizedType) {
        ParameterizedType original = (ParameterizedType) toResolve;
        Type ownerType = original.getOwnerType();
        Type newOwnerType = resolveType(ownerType);
        boolean changed = newOwnerType != ownerType;


        Type[] args = original.getActualTypeArguments();
        for (int t = 0, length = args.length; t < length; t++) {
          Type resolvedTypeArgument = resolveType(args[t]);
          if (resolvedTypeArgument != args[t]) {
            if (!changed) {
              args = args.clone();
              changed = true;
            }
            args[t] = resolvedTypeArgument;
          }
        }


        return changed
            ? Types.newParameterizedTypeWithOwner(newOwnerType, original.getRawType(), args)
            : original;


      } else if (toResolve instanceof WildcardType) {
        WildcardType original = (WildcardType) toResolve;
        Type[] originalLowerBound = original.getLowerBounds();
        Type[] originalUpperBound = original.getUpperBounds();


        if (originalLowerBound.length == 1) {
          Type lowerBound = resolveType(originalLowerBound[0]);
          if (lowerBound != originalLowerBound[0]) {
            return Types.supertypeOf(lowerBound);

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                ParameterizedType pt = (ParameterizedType)t;
                Type[] args = pt.getActualTypeArguments();
                for (int i = 0; i < args.length; i++) {
                    Type arg = args[i];
                    if (arg instanceof TypeVariable) {
                        TypeVariable var = (TypeVariable)arg;
                        Type[] bounds = var.getBounds();
                        boolean isResolved = false;
                        for (int j = 0; j < bounds.length; j++) {
                            Class<?> cls = InjectionUtils.getRawType(bounds[j]);
                            if (cls != null && cls.isAssignableFrom(expectedType)) {
                                isResolved = true;

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        }
        if (type instanceof TypeVariable) {
            if (parameterizedTypes == null) {
                processParameterizedTypes();
            }
            TypeVariable var = (TypeVariable)type;
            Map<String, Class<?>> mp = parameterizedTypes.get(var.getGenericDeclaration());
            if (mp != null) {
                Class<?> c = parameterizedTypes.get(var.getGenericDeclaration()).get(var.getName());
                if (c != null) {
                    rawClass = c;
                    type = c;
                    part.getMessageInfo().setProperty("parameterized", Boolean.TRUE);
                }

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        }
        if (type instanceof TypeVariable) {
            if (parameterizedTypes == null) {
                processParameterizedTypes();
            }
            TypeVariable var = (TypeVariable)type;
            Map<String, Class<?>> mp = parameterizedTypes.get(var.getGenericDeclaration());
            if (mp != null) {
                Class<?> c = parameterizedTypes.get(var.getGenericDeclaration()).get(var.getName());
                if (c != null) {
                    rawClass = c;
                    type = c;
                    part.getMessageInfo().setProperty("parameterized", Boolean.TRUE);
                }

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        }
        if (type instanceof TypeVariable) {
            if (parameterizedTypes == null) {
                processParameterizedTypes();
            }
            TypeVariable var = (TypeVariable)type;
            Map<String, Class<?>> mp = parameterizedTypes.get(var.getGenericDeclaration());
            if (mp != null) {
                Class<?> c = parameterizedTypes.get(var.getGenericDeclaration()).get(var.getName());
                if (c != null) {
                    rawClass = c;
                    type = c;
                    part.getMessageInfo().setProperty("parameterized", Boolean.TRUE);
                }

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        } else if (type instanceof WildcardType) {
            WildcardType wType = (WildcardType)type;
            Type[] types = wType.getUpperBounds();
            return getErasure(types[0]);
        } else if (type instanceof TypeVariable) {
            TypeVariable var = (TypeVariable)type;
            Type[] types = var.getBounds();
            return getErasure(types[0]);
        }
        return null;
    }

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