Java WildcardType類代碼示例

import java.lang.reflect.WildcardType; //導入依賴的package包/類
/**
 * Returns a type that is functionally equal but not necessarily equal according to {@link
 * Object#equals(Object) Object.equals()}.
 */
static Type canonicalize(Type type) {
  if (type instanceof Class) {
    Class<?> c = (Class<?>) type;
    return c.isArray() ? new GenericArrayTypeImpl(canonicalize(c.getComponentType())) : c;

  } else if (type instanceof ParameterizedType) {
    if (type instanceof ParameterizedTypeImpl) return type;
    ParameterizedType p = (ParameterizedType) type;
    return new ParameterizedTypeImpl(p.getOwnerType(),
        p.getRawType(), p.getActualTypeArguments());

  } else if (type instanceof GenericArrayType) {
    if (type instanceof GenericArrayTypeImpl) return type;
    GenericArrayType g = (GenericArrayType) type;
    return new GenericArrayTypeImpl(g.getGenericComponentType());

  } else if (type instanceof WildcardType) {
    if (type instanceof WildcardTypeImpl) return type;
    WildcardType w = (WildcardType) type;
    return new WildcardTypeImpl(w.getUpperBounds(), w.getLowerBounds());

  } else {
    return type; // This type is unsupported!
  }
}
 

import java.lang.reflect.WildcardType; //導入依賴的package包/類
private static boolean isAssignable(ParameterizedType lhsType, ParameterizedType rhsType){
    if (lhsType.equals(rhsType)) {
        return true;
    }

    Type[] lhsTypeArguments = lhsType.getActualTypeArguments();
    Type[] rhsTypeArguments = rhsType.getActualTypeArguments();

    if (lhsTypeArguments.length != rhsTypeArguments.length) {
        return false;
    }

    for (int size = lhsTypeArguments.length, i = 0; i < size; ++i) {
        Type lhsArg = lhsTypeArguments[i];
        Type rhsArg = rhsTypeArguments[i];

        if (!lhsArg.equals(rhsArg) &&
                !(lhsArg instanceof WildcardType && isAssignable((WildcardType) lhsArg, rhsArg))) {
            return false;
        }
    }

    return true;
}
 

import java.lang.reflect.WildcardType; //導入依賴的package包/類
static boolean hasUnresolvableType(Type type) {
    if (type instanceof Class<?>) {
        return false;
    }
    if (type instanceof ParameterizedType) {
        ParameterizedType parameterizedType = (ParameterizedType) type;
        for (Type typeArgument : parameterizedType.getActualTypeArguments()) {
            if (hasUnresolvableType(typeArgument)) {
                return true;
            }
        }
        return false;
    }
    if (type instanceof GenericArrayType) {
        return hasUnresolvableType(((GenericArrayType) type).getGenericComponentType());
    }
    if (type instanceof TypeVariable) {
        return true;
    }
    if (type instanceof WildcardType) {
        return true;
    }
    String className = type == null ? "null" : type.getClass().getName();
    throw new IllegalArgumentException("Expected a Class, ParameterizedType, or "
            + "GenericArrayType, but <" + type + "> is of type " + className);
}
 

import java.lang.reflect.WildcardType; //導入依賴的package包/類
public void testGetSubtype_recursiveTypeBoundInSubtypeTranslatedAsIs() {
  class BaseWithTypeVar<T> {}
  class Outer<O> {
    class Sub<X> extends BaseWithTypeVar<List<X>> {}
    class Sub2<Y extends Sub2<Y>> extends BaseWithTypeVar<List<Y>> {}
  }
  ParameterizedType subtype = (ParameterizedType) new TypeToken<BaseWithTypeVar<List<?>>>() {}
          .getSubtype(Outer.Sub.class)
          .getType();
  assertEquals(Outer.Sub.class, subtype.getRawType());
  assertThat(subtype.getActualTypeArguments()[0]).isInstanceOf(WildcardType.class);
  ParameterizedType owner = (ParameterizedType) subtype.getOwnerType();
  assertEquals(Outer.class, owner.getRawType());
  // This returns a strange ? extends Sub2<Y> type, which isn't ideal.
  TypeToken<?> unused = new TypeToken<BaseWithTypeVar<List<?>>>() {}.getSubtype(Outer.Sub2.class);
}
 

import java.lang.reflect.WildcardType; //導入依賴的package包/類
public static Type canonicalize(Type type) {
    if (type instanceof Class) {
        GenericArrayTypeImpl genericArrayTypeImpl;
        Class<?> c = (Class) type;
        if (c.isArray()) {
            genericArrayTypeImpl = new GenericArrayTypeImpl(C$Gson$Types.canonicalize(c
                    .getComponentType()));
        } else {
            Object obj = c;
        }
        return genericArrayTypeImpl;
    } else if (type instanceof ParameterizedType) {
        ParameterizedType p = (ParameterizedType) type;
        return new ParameterizedTypeImpl(p.getOwnerType(), p.getRawType(), p
                .getActualTypeArguments());
    } else if (type instanceof GenericArrayType) {
        return new GenericArrayTypeImpl(((GenericArrayType) type).getGenericComponentType());
    } else {
        if (!(type instanceof WildcardType)) {
            return type;
        }
        WildcardType w = (WildcardType) type;
        return new WildcardTypeImpl(w.getUpperBounds(), w.getLowerBounds());
    }
}
 

import java.lang.reflect.WildcardType; //導入依賴的package包/類
/**
 * Returns a type that is functionally equal but not necessarily equal
 * according to {@link Object#equals(Object) Object.equals()}. The returned
 * type is {@link java.io.Serializable}.
 */
public static Type canonicalize(Type type) {
  if (type instanceof Class) {
    Class<?> c = (Class<?>) type;
    return c.isArray() ? new GenericArrayTypeImpl(canonicalize(c.getComponentType())) : c;

  } else if (type instanceof ParameterizedType) {
    ParameterizedType p = (ParameterizedType) type;
    return new ParameterizedTypeImpl(p.getOwnerType(),
        p.getRawType(), p.getActualTypeArguments());

  } else if (type instanceof GenericArrayType) {
    GenericArrayType g = (GenericArrayType) type;
    return new GenericArrayTypeImpl(g.getGenericComponentType());

  } else if (type instanceof WildcardType) {
    WildcardType w = (WildcardType) type;
    return new WildcardTypeImpl(w.getUpperBounds(), w.getLowerBounds());

  } else {
    // type is either serializable as-is or unsupported
    return type;
  }
}
 

import java.lang.reflect.WildcardType; //導入依賴的package包/類
/**
 * Return true if any of the following conditions is met:
 *
 * <ul>
 * <li>'this' and {@code formalType} are equal
 * <li>{@code formalType} is {@code <? extends Foo>} and 'this' is a subtype of {@code Foo}
 * <li>{@code formalType} is {@code <? super Foo>} and 'this' is a supertype of {@code Foo}
 * </ul>
 */
private boolean is(Type formalType) {
  if (runtimeType.equals(formalType)) {
    return true;
  }
  if (formalType instanceof WildcardType) {
    // if "formalType" is <? extends Foo>, "this" can be:
    // Foo, SubFoo, <? extends Foo>, <? extends SubFoo>, <T extends Foo> or
    // <T extends SubFoo>.
    // if "formalType" is <? super Foo>, "this" can be:
    // Foo, SuperFoo, <? super Foo> or <? super SuperFoo>.
    return every(((WildcardType) formalType).getUpperBounds()).isSupertypeOf(runtimeType)
        && every(((WildcardType) formalType).getLowerBounds()).isSubtypeOf(runtimeType);
  }
  return false;
}
 

import java.lang.reflect.WildcardType; //導入依賴的package包/類
static boolean hasUnresolvableType(Type type) {
  if (type instanceof Class<?>) {
    return false;
  }
  if (type instanceof ParameterizedType) {
    ParameterizedType parameterizedType = (ParameterizedType) type;
    for (Type typeArgument : parameterizedType.getActualTypeArguments()) {
      if (hasUnresolvableType(typeArgument)) {
        return true;
      }
    }
    return false;
  }
  if (type instanceof GenericArrayType) {
    return hasUnresolvableType(((GenericArrayType) type).getGenericComponentType());
  }
  if (type instanceof TypeVariable) {
    return true;
  }
  if (type instanceof WildcardType) {
    return true;
  }
  String className = type == null ? "null" : type.getClass().getName();
  throw new IllegalArgumentException("Expected a Class, ParameterizedType, or "
      + "GenericArrayType, but <" + type + "> is of type " + className);
}
 

import java.lang.reflect.WildcardType; //導入依賴的package包/類
/**
 * Returns the generic interfaces that this type directly {@code implements}. This method is
 * similar but different from {@link Class#getGenericInterfaces()}. For example, {@code new
 * TypeToken<List<String>>() {}.getGenericInterfaces()} will return a list that contains
 * {@code new TypeToken<Iterable<String>>() {}}; while {@code List.class.getGenericInterfaces()}
 * will return an array that contains {@code Iterable<T>}, where the {@code T} is the type
 * variable declared by interface {@code Iterable}.
 *
 * <p>If this type is a type variable or wildcard, its upper bounds are examined and those that
 * are either an interface or upper-bounded only by interfaces are returned. This means that the
 * returned types could include type variables too.
 */
final ImmutableList<TypeToken<? super T>> getGenericInterfaces() {
  if (runtimeType instanceof TypeVariable) {
    return boundsAsInterfaces(((TypeVariable<?>) runtimeType).getBounds());
  }
  if (runtimeType instanceof WildcardType) {
    return boundsAsInterfaces(((WildcardType) runtimeType).getUpperBounds());
  }
  ImmutableList.Builder<TypeToken<? super T>> builder = ImmutableList.builder();
  for (Type interfaceType : getRawType().getGenericInterfaces()) {
    @SuppressWarnings("unchecked") // interface of T
    TypeToken<? super T> resolvedInterface =
        (TypeToken<? super T>) resolveSupertype(interfaceType);
    builder.add(resolvedInterface);
  }
  return builder.build();
}
 

import java.lang.reflect.WildcardType; //導入依賴的package包/類
public static Type getCollectionItemType(Type fieldType){
    Type itemType = null;
    Class<?> clazz = null;
    if(fieldType instanceof ParameterizedType){
        Type actualTypeArgument = ((ParameterizedType) fieldType).getActualTypeArguments()[0];
        if(actualTypeArgument instanceof WildcardType){
            WildcardType wildcardType = (WildcardType) actualTypeArgument;
            Type[] upperBounds = wildcardType.getUpperBounds();
            if(upperBounds.length == 1){
                actualTypeArgument = upperBounds[0];
            }
        }
        itemType = actualTypeArgument;
    } else if(fieldType instanceof Class<?> //
            && !(clazz = (Class<?>) fieldType).getName().startsWith("java.")){
        Type superClass = clazz.getGenericSuperclass();
        itemType = TypeUtils.getCollectionItemType(superClass);
    }
    if(itemType == null){
        itemType = Object.class;
    }
    return itemType;
}
 

import java.lang.reflect.WildcardType; //導入依賴的package包/類
public static Class<?> getCollectionItemClass(Type fieldType){
    if(fieldType instanceof ParameterizedType){
        Class<?> itemClass;
        Type actualTypeArgument = ((ParameterizedType) fieldType).getActualTypeArguments()[0];
        if(actualTypeArgument instanceof WildcardType){
            WildcardType wildcardType = (WildcardType) actualTypeArgument;
            Type[] upperBounds = wildcardType.getUpperBounds();
            if(upperBounds.length == 1){
                actualTypeArgument = upperBounds[0];
            }
        }
        if(actualTypeArgument instanceof Class){
            itemClass = (Class<?>) actualTypeArgument;
            if(!Modifier.isPublic(itemClass.getModifiers())){
                throw new JSONException("can not create ASMParser");
            }
        } else{
            throw new JSONException("can not create ASMParser");
        }
        return itemClass;
    }
    return Object.class;
}
 

import java.lang.reflect.WildcardType; //導入依賴的package包/類
/**
 * Returns the hashCode of {@code type}.
 */
public static int hashCode(Type type) {
    if (type instanceof Class) {
        // Class specifies hashCode().
        return type.hashCode();

    } else if (type instanceof ParameterizedType) {
        ParameterizedType p = (ParameterizedType) type;
        return Arrays.hashCode(p.getActualTypeArguments())
                ^ p.getRawType().hashCode()
                ^ hashCodeOrZero(p.getOwnerType());

    } else if (type instanceof GenericArrayType) {
        return hashCode(((GenericArrayType) type).getGenericComponentType());

    } else if (type instanceof WildcardType) {
        WildcardType w = (WildcardType) type;
        return Arrays.hashCode(w.getLowerBounds()) ^ Arrays.hashCode(w.getUpperBounds());

    } else {
        // This isn't a type we support. Probably a type variable
        return hashCodeOrZero(type);
    }
}
 

import java.lang.reflect.WildcardType; //導入依賴的package包/類
@Override
public Type responseType() {
    Type rawType = ((ParameterizedType) returnType).getRawType();
    if (rawType.equals(Call.class) || rawType.equals(MockableCall.class) || rawType.equals(com.gabrielsamojlo.offit.Call.class)) {
        Type[] types = ((ParameterizedType) returnType).getActualTypeArguments();
        Type paramType = types[0];
        if (paramType instanceof WildcardType) {
            return ((WildcardType) paramType).getUpperBounds()[0];
        }

        this.type = paramType;

        return paramType;
    } else {
        CallAdapter callAdapter = retrofit.nextCallAdapter(factory, returnType, annotations);
        return callAdapter.responseType();
    }
}
 

import java.lang.reflect.WildcardType; //導入依賴的package包/類
/** Returns the array type of {@code componentType}. */
static Type newArrayType(Type componentType) {
  if (componentType instanceof WildcardType) {
    WildcardType wildcard = (WildcardType) componentType;
    Type[] lowerBounds = wildcard.getLowerBounds();
    checkArgument(lowerBounds.length <= 1, "Wildcard cannot have more than one lower bounds.");
    if (lowerBounds.length == 1) {
      return supertypeOf(newArrayType(lowerBounds[0]));
    } else {
      Type[] upperBounds = wildcard.getUpperBounds();
      checkArgument(upperBounds.length == 1, "Wildcard should have only one upper bound.");
      return subtypeOf(newArrayType(upperBounds[0]));
    }
  }
  return JavaVersion.CURRENT.newArrayType(componentType);
}
 

import java.lang.reflect.WildcardType; //導入依賴的package包/類
static Class<?> getRawType(Type type) {
    if (type == null) throw new NullPointerException("type == null");

    if (type instanceof Class<?>) {
        // Type is a normal class.
        return (Class<?>) type;
    }
    if (type instanceof ParameterizedType) {
        ParameterizedType parameterizedType = (ParameterizedType) type;

        // I'm not exactly sure why getRawType() returns Type instead of Class. Neal isn't either but
        // suspects some pathological case related to nested classes exists.
        Type rawType = parameterizedType.getRawType();
        if (!(rawType instanceof Class)) throw new IllegalArgumentException();
        return (Class<?>) rawType;
    }
    if (type instanceof GenericArrayType) {
        Type componentType = ((GenericArrayType) type).getGenericComponentType();
        return Array.newInstance(getRawType(componentType), 0).getClass();
    }
    if (type instanceof TypeVariable) {
        // We could use the variable's bounds, but that won't work if there are multiple. Having a raw
        // type that's more general than necessary is okay.
        return Object.class;
    }
    if (type instanceof WildcardType) {
        return getRawType(((WildcardType) type).getUpperBounds()[0]);
    }

    throw new IllegalArgumentException("Expected a Class, ParameterizedType, or "
            + "GenericArrayType, but <" + type + "> is of type " + type.getClass().getName());
}