| 1 | /** |
| 2 | * Copyright (C) 2008 Google Inc. |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.google.gson.internal; |
| 18 | |
| 19 | import static com.google.gson.internal.$Gson$Preconditions.checkArgument; |
| 20 | import static com.google.gson.internal.$Gson$Preconditions.checkNotNull; |
| 21 | |
| 22 | import java.io.Serializable; |
| 23 | import java.lang.reflect.Array; |
| 24 | import java.lang.reflect.GenericArrayType; |
| 25 | import java.lang.reflect.GenericDeclaration; |
| 26 | import java.lang.reflect.ParameterizedType; |
| 27 | import java.lang.reflect.Type; |
| 28 | import java.lang.reflect.TypeVariable; |
| 29 | import java.lang.reflect.WildcardType; |
| 30 | import java.util.Arrays; |
| 31 | import java.util.Collection; |
| 32 | import java.util.Map; |
| 33 | import java.util.NoSuchElementException; |
| 34 | import java.util.Properties; |
| 35 | |
| 36 | /** |
| 37 | * Static methods for working with types. |
| 38 | * |
| 39 | * @author Bob Lee |
| 40 | * @author Jesse Wilson |
| 41 | */ |
| 42 | public final class $Gson$Types { |
| 43 | static final Type[] EMPTY_TYPE_ARRAY = new Type[] {}; |
| 44 | |
| 45 | private $Gson$Types() {} |
| 46 | |
| 47 | /** |
| 48 | * Returns a new parameterized type, applying {@code typeArguments} to |
| 49 | * {@code rawType} and enclosed by {@code ownerType}. |
| 50 | * |
| 51 | * @return a {@link java.io.Serializable serializable} parameterized type. |
| 52 | */ |
| 53 | public static ParameterizedType newParameterizedTypeWithOwner( |
| 54 | Type ownerType, Type rawType, Type... typeArguments) { |
| 55 | return new ParameterizedTypeImpl(ownerType, rawType, typeArguments); |
| 56 | } |
| 57 | |
| 58 | /** |
| 59 | * Returns an array type whose elements are all instances of |
| 60 | * {@code componentType}. |
| 61 | * |
| 62 | * @return a {@link java.io.Serializable serializable} generic array type. |
| 63 | */ |
| 64 | public static GenericArrayType arrayOf(Type componentType) { |
| 65 | return new GenericArrayTypeImpl(componentType); |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * Returns a type that represents an unknown type that extends {@code bound}. |
| 70 | * For example, if {@code bound} is {@code CharSequence.class}, this returns |
| 71 | * {@code ? extends CharSequence}. If {@code bound} is {@code Object.class}, |
| 72 | * this returns {@code ?}, which is shorthand for {@code ? extends Object}. |
| 73 | */ |
| 74 | public static WildcardType subtypeOf(Type bound) { |
| 75 | return new WildcardTypeImpl(new Type[] { bound }, EMPTY_TYPE_ARRAY); |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * Returns a type that represents an unknown supertype of {@code bound}. For |
| 80 | * example, if {@code bound} is {@code String.class}, this returns {@code ? |
| 81 | * super String}. |
| 82 | */ |
| 83 | public static WildcardType supertypeOf(Type bound) { |
| 84 | return new WildcardTypeImpl(new Type[] { Object.class }, new Type[] { bound }); |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * Returns a type that is functionally equal but not necessarily equal |
| 89 | * according to {@link Object#equals(Object) Object.equals()}. The returned |
| 90 | * type is {@link java.io.Serializable}. |
| 91 | */ |
| 92 | public static Type canonicalize(Type type) { |
| 93 | if (type instanceof Class) { |
| 94 | Class<?> c = (Class<?>) type; |
| 95 | return c.isArray() ? new GenericArrayTypeImpl(canonicalize(c.getComponentType())) : c; |
| 96 | |
| 97 | } else if (type instanceof ParameterizedType) { |
| 98 | ParameterizedType p = (ParameterizedType) type; |
| 99 | return new ParameterizedTypeImpl(p.getOwnerType(), |
| 100 | p.getRawType(), p.getActualTypeArguments()); |
| 101 | |
| 102 | } else if (type instanceof GenericArrayType) { |
| 103 | GenericArrayType g = (GenericArrayType) type; |
| 104 | return new GenericArrayTypeImpl(g.getGenericComponentType()); |
| 105 | |
| 106 | } else if (type instanceof WildcardType) { |
| 107 | WildcardType w = (WildcardType) type; |
| 108 | return new WildcardTypeImpl(w.getUpperBounds(), w.getLowerBounds()); |
| 109 | |
| 110 | } else { |
| 111 | // type is either serializable as-is or unsupported |
| 112 | return type; |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | public static Class<?> getRawType(Type type) { |
| 117 | if (type instanceof Class<?>) { |
| 118 | // type is a normal class. |
| 119 | return (Class<?>) type; |
| 120 | |
| 121 | } else if (type instanceof ParameterizedType) { |
| 122 | ParameterizedType parameterizedType = (ParameterizedType) type; |
| 123 | |
| 124 | // I'm not exactly sure why getRawType() returns Type instead of Class. |
| 125 | // Neal isn't either but suspects some pathological case related |
| 126 | // to nested classes exists. |
| 127 | Type rawType = parameterizedType.getRawType(); |
| 128 | checkArgument(rawType instanceof Class); |
| 129 | return (Class<?>) rawType; |
| 130 | |
| 131 | } else if (type instanceof GenericArrayType) { |
| 132 | Type componentType = ((GenericArrayType)type).getGenericComponentType(); |
| 133 | return Array.newInstance(getRawType(componentType), 0).getClass(); |
| 134 | |
| 135 | } else if (type instanceof TypeVariable) { |
| 136 | // we could use the variable's bounds, but that won't work if there are multiple. |
| 137 | // having a raw type that's more general than necessary is okay |
| 138 | return Object.class; |
| 139 | |
| 140 | } else if (type instanceof WildcardType) { |
| 141 | return getRawType(((WildcardType) type).getUpperBounds()[0]); |
| 142 | |
| 143 | } else { |
| 144 | String className = type == null ? "null" : type.getClass().getName(); |
| 145 | throw new IllegalArgumentException("Expected a Class, ParameterizedType, or " |
| 146 | + "GenericArrayType, but <" + type + "> is of type " + className); |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | static boolean equal(Object a, Object b) { |
| 151 | return a == b || (a != null && a.equals(b)); |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * Returns true if {@code a} and {@code b} are equal. |
| 156 | */ |
| 157 | public static boolean equals(Type a, Type b) { |
| 158 | if (a == b) { |
| 159 | // also handles (a == null && b == null) |
| 160 | return true; |
| 161 | |
| 162 | } else if (a instanceof Class) { |
| 163 | // Class already specifies equals(). |
| 164 | return a.equals(b); |
| 165 | |
| 166 | } else if (a instanceof ParameterizedType) { |
| 167 | if (!(b instanceof ParameterizedType)) { |
| 168 | return false; |
| 169 | } |
| 170 | |
| 171 | // TODO: save a .clone() call |
| 172 | ParameterizedType pa = (ParameterizedType) a; |
| 173 | ParameterizedType pb = (ParameterizedType) b; |
| 174 | return equal(pa.getOwnerType(), pb.getOwnerType()) |
| 175 | && pa.getRawType().equals(pb.getRawType()) |
| 176 | && Arrays.equals(pa.getActualTypeArguments(), pb.getActualTypeArguments()); |
| 177 | |
| 178 | } else if (a instanceof GenericArrayType) { |
| 179 | if (!(b instanceof GenericArrayType)) { |
| 180 | return false; |
| 181 | } |
| 182 | |
| 183 | GenericArrayType ga = (GenericArrayType) a; |
| 184 | GenericArrayType gb = (GenericArrayType) b; |
| 185 | return equals(ga.getGenericComponentType(), gb.getGenericComponentType()); |
| 186 | |
| 187 | } else if (a instanceof WildcardType) { |
| 188 | if (!(b instanceof WildcardType)) { |
| 189 | return false; |
| 190 | } |
| 191 | |
| 192 | WildcardType wa = (WildcardType) a; |
| 193 | WildcardType wb = (WildcardType) b; |
| 194 | return Arrays.equals(wa.getUpperBounds(), wb.getUpperBounds()) |
| 195 | && Arrays.equals(wa.getLowerBounds(), wb.getLowerBounds()); |
| 196 | |
| 197 | } else if (a instanceof TypeVariable) { |
| 198 | if (!(b instanceof TypeVariable)) { |
| 199 | return false; |
| 200 | } |
| 201 | TypeVariable<?> va = (TypeVariable<?>) a; |
| 202 | TypeVariable<?> vb = (TypeVariable<?>) b; |
| 203 | return va.getGenericDeclaration() == vb.getGenericDeclaration() |
| 204 | && va.getName().equals(vb.getName()); |
| 205 | |
| 206 | } else { |
| 207 | // This isn't a type we support. Could be a generic array type, wildcard type, etc. |
| 208 | return false; |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | private static int hashCodeOrZero(Object o) { |
| 213 | return o != null ? o.hashCode() : 0; |
| 214 | } |
| 215 | |
| 216 | public static String typeToString(Type type) { |
| 217 | return type instanceof Class ? ((Class<?>) type).getName() : type.toString(); |
| 218 | } |
| 219 | |
| 220 | /** |
| 221 | * Returns the generic supertype for {@code supertype}. For example, given a class {@code |
| 222 | * IntegerSet}, the result for when supertype is {@code Set.class} is {@code Set<Integer>} and the |
| 223 | * result when the supertype is {@code Collection.class} is {@code Collection<Integer>}. |
| 224 | */ |
| 225 | static Type getGenericSupertype(Type context, Class<?> rawType, Class<?> toResolve) { |
| 226 | if (toResolve == rawType) { |
| 227 | return context; |
| 228 | } |
| 229 | |
| 230 | // we skip searching through interfaces if unknown is an interface |
| 231 | if (toResolve.isInterface()) { |
| 232 | Class<?>[] interfaces = rawType.getInterfaces(); |
| 233 | for (int i = 0, length = interfaces.length; i < length; i++) { |
| 234 | if (interfaces[i] == toResolve) { |
| 235 | return rawType.getGenericInterfaces()[i]; |
| 236 | } else if (toResolve.isAssignableFrom(interfaces[i])) { |
| 237 | return getGenericSupertype(rawType.getGenericInterfaces()[i], interfaces[i], toResolve); |
| 238 | } |
| 239 | } |
| 240 | } |
| 241 | |
| 242 | // check our supertypes |
| 243 | if (!rawType.isInterface()) { |
| 244 | while (rawType != Object.class) { |
| 245 | Class<?> rawSupertype = rawType.getSuperclass(); |
| 246 | if (rawSupertype == toResolve) { |
| 247 | return rawType.getGenericSuperclass(); |
| 248 | } else if (toResolve.isAssignableFrom(rawSupertype)) { |
| 249 | return getGenericSupertype(rawType.getGenericSuperclass(), rawSupertype, toResolve); |
| 250 | } |
| 251 | rawType = rawSupertype; |
| 252 | } |
| 253 | } |
| 254 | |
| 255 | // we can't resolve this further |
| 256 | return toResolve; |
| 257 | } |
| 258 | |
| 259 | /** |
| 260 | * Returns the generic form of {@code supertype}. For example, if this is {@code |
| 261 | * ArrayList<String>}, this returns {@code Iterable<String>} given the input {@code |
| 262 | * Iterable.class}. |
| 263 | * |
| 264 | * @param supertype a superclass of, or interface implemented by, this. |
| 265 | */ |
| 266 | static Type getSupertype(Type context, Class<?> contextRawType, Class<?> supertype) { |
| 267 | checkArgument(supertype.isAssignableFrom(contextRawType)); |
| 268 | return resolve(context, contextRawType, |
| 269 | $Gson$Types.getGenericSupertype(context, contextRawType, supertype)); |
| 270 | } |
| 271 | |
| 272 | /** |
| 273 | * Returns the component type of this array type. |
| 274 | * @throws ClassCastException if this type is not an array. |
| 275 | */ |
| 276 | public static Type getArrayComponentType(Type array) { |
| 277 | return array instanceof GenericArrayType |
| 278 | ? ((GenericArrayType) array).getGenericComponentType() |
| 279 | : ((Class<?>) array).getComponentType(); |
| 280 | } |
| 281 | |
| 282 | /** |
| 283 | * Returns the element type of this collection type. |
| 284 | * @throws IllegalArgumentException if this type is not a collection. |
| 285 | */ |
| 286 | public static Type getCollectionElementType(Type context, Class<?> contextRawType) { |
| 287 | Type collectionType = getSupertype(context, contextRawType, Collection.class); |
| 288 | |
| 289 | if (collectionType instanceof WildcardType) { |
| 290 | collectionType = ((WildcardType)collectionType).getUpperBounds()[0]; |
| 291 | } |
| 292 | if (collectionType instanceof ParameterizedType) { |
| 293 | return ((ParameterizedType) collectionType).getActualTypeArguments()[0]; |
| 294 | } |
| 295 | return Object.class; |
| 296 | } |
| 297 | |
| 298 | /** |
| 299 | * Returns a two element array containing this map's key and value types in |
| 300 | * positions 0 and 1 respectively. |
| 301 | */ |
| 302 | public static Type[] getMapKeyAndValueTypes(Type context, Class<?> contextRawType) { |
| 303 | /* |
| 304 | * Work around a problem with the declaration of java.util.Properties. That |
| 305 | * class should extend Hashtable<String, String>, but it's declared to |
| 306 | * extend Hashtable<Object, Object>. |
| 307 | */ |
| 308 | if (context == Properties.class) { |
| 309 | return new Type[] { String.class, String.class }; // TODO: test subclasses of Properties! |
| 310 | } |
| 311 | |
| 312 | Type mapType = getSupertype(context, contextRawType, Map.class); |
| 313 | // TODO: strip wildcards? |
| 314 | if (mapType instanceof ParameterizedType) { |
| 315 | ParameterizedType mapParameterizedType = (ParameterizedType) mapType; |
| 316 | return mapParameterizedType.getActualTypeArguments(); |
| 317 | } |
| 318 | return new Type[] { Object.class, Object.class }; |
| 319 | } |
| 320 | |
| 321 | public static Type resolve(Type context, Class<?> contextRawType, Type toResolve) { |
| 322 | // this implementation is made a little more complicated in an attempt to avoid object-creation |
| 323 | while (true) { |
| 324 | if (toResolve instanceof TypeVariable) { |
| 325 | TypeVariable<?> typeVariable = (TypeVariable<?>) toResolve; |
| 326 | toResolve = resolveTypeVariable(context, contextRawType, typeVariable); |
| 327 | if (toResolve == typeVariable) { |
| 328 | return toResolve; |
| 329 | } |
| 330 | |
| 331 | } else if (toResolve instanceof Class && ((Class<?>) toResolve).isArray()) { |
| 332 | Class<?> original = (Class<?>) toResolve; |
| 333 | Type componentType = original.getComponentType(); |
| 334 | Type newComponentType = resolve(context, contextRawType, componentType); |
| 335 | return componentType == newComponentType |
| 336 | ? original |
| 337 | : arrayOf(newComponentType); |
| 338 | |
| 339 | } else if (toResolve instanceof GenericArrayType) { |
| 340 | GenericArrayType original = (GenericArrayType) toResolve; |
| 341 | Type componentType = original.getGenericComponentType(); |
| 342 | Type newComponentType = resolve(context, contextRawType, componentType); |
| 343 | return componentType == newComponentType |
| 344 | ? original |
| 345 | : arrayOf(newComponentType); |
| 346 | |
| 347 | } else if (toResolve instanceof ParameterizedType) { |
| 348 | ParameterizedType original = (ParameterizedType) toResolve; |
| 349 | Type ownerType = original.getOwnerType(); |
| 350 | Type newOwnerType = resolve(context, contextRawType, ownerType); |
| 351 | boolean changed = newOwnerType != ownerType; |
| 352 | |
| 353 | Type[] args = original.getActualTypeArguments(); |
| 354 | for (int t = 0, length = args.length; t < length; t++) { |
| 355 | Type resolvedTypeArgument = resolve(context, contextRawType, args[t]); |
| 356 | if (resolvedTypeArgument != args[t]) { |
| 357 | if (!changed) { |
| 358 | args = args.clone(); |
| 359 | changed = true; |
| 360 | } |
| 361 | args[t] = resolvedTypeArgument; |
| 362 | } |
| 363 | } |
| 364 | |
| 365 | return changed |
| 366 | ? newParameterizedTypeWithOwner(newOwnerType, original.getRawType(), args) |
| 367 | : original; |
| 368 | |
| 369 | } else if (toResolve instanceof WildcardType) { |
| 370 | WildcardType original = (WildcardType) toResolve; |
| 371 | Type[] originalLowerBound = original.getLowerBounds(); |
| 372 | Type[] originalUpperBound = original.getUpperBounds(); |
| 373 | |
| 374 | if (originalLowerBound.length == 1) { |
| 375 | Type lowerBound = resolve(context, contextRawType, originalLowerBound[0]); |
| 376 | if (lowerBound != originalLowerBound[0]) { |
| 377 | return supertypeOf(lowerBound); |
| 378 | } |
| 379 | } else if (originalUpperBound.length == 1) { |
| 380 | Type upperBound = resolve(context, contextRawType, originalUpperBound[0]); |
| 381 | if (upperBound != originalUpperBound[0]) { |
| 382 | return subtypeOf(upperBound); |
| 383 | } |
| 384 | } |
| 385 | return original; |
| 386 | |
| 387 | } else { |
| 388 | return toResolve; |
| 389 | } |
| 390 | } |
| 391 | } |
| 392 | |
| 393 | static Type resolveTypeVariable(Type context, Class<?> contextRawType, TypeVariable<?> unknown) { |
| 394 | Class<?> declaredByRaw = declaringClassOf(unknown); |
| 395 | |
| 396 | // we can't reduce this further |
| 397 | if (declaredByRaw == null) { |
| 398 | return unknown; |
| 399 | } |
| 400 | |
| 401 | Type declaredBy = getGenericSupertype(context, contextRawType, declaredByRaw); |
| 402 | if (declaredBy instanceof ParameterizedType) { |
| 403 | int index = indexOf(declaredByRaw.getTypeParameters(), unknown); |
| 404 | return ((ParameterizedType) declaredBy).getActualTypeArguments()[index]; |
| 405 | } |
| 406 | |
| 407 | return unknown; |
| 408 | } |
| 409 | |
| 410 | private static int indexOf(Object[] array, Object toFind) { |
| 411 | for (int i = 0; i < array.length; i++) { |
| 412 | if (toFind.equals(array[i])) { |
| 413 | return i; |
| 414 | } |
| 415 | } |
| 416 | throw new NoSuchElementException(); |
| 417 | } |
| 418 | |
| 419 | /** |
| 420 | * Returns the declaring class of {@code typeVariable}, or {@code null} if it was not declared by |
| 421 | * a class. |
| 422 | */ |
| 423 | private static Class<?> declaringClassOf(TypeVariable<?> typeVariable) { |
| 424 | GenericDeclaration genericDeclaration = typeVariable.getGenericDeclaration(); |
| 425 | return genericDeclaration instanceof Class |
| 426 | ? (Class<?>) genericDeclaration |
| 427 | : null; |
| 428 | } |
| 429 | |
| 430 | private static void checkNotPrimitive(Type type) { |
| 431 | checkArgument(!(type instanceof Class<?>) || !((Class<?>) type).isPrimitive()); |
| 432 | } |
| 433 | |
| 434 | private static final class ParameterizedTypeImpl implements ParameterizedType, Serializable { |
| 435 | private final Type ownerType; |
| 436 | private final Type rawType; |
| 437 | private final Type[] typeArguments; |
| 438 | |
| 439 | public ParameterizedTypeImpl(Type ownerType, Type rawType, Type... typeArguments) { |
| 440 | // require an owner type if the raw type needs it |
| 441 | if (rawType instanceof Class<?>) { |
| 442 | Class<?> rawTypeAsClass = (Class<?>) rawType; |
| 443 | checkArgument(ownerType != null || rawTypeAsClass.getEnclosingClass() == null); |
| 444 | checkArgument(ownerType == null || rawTypeAsClass.getEnclosingClass() != null); |
| 445 | } |
| 446 | |
| 447 | this.ownerType = ownerType == null ? null : canonicalize(ownerType); |
| 448 | this.rawType = canonicalize(rawType); |
| 449 | this.typeArguments = typeArguments.clone(); |
| 450 | for (int t = 0; t < this.typeArguments.length; t++) { |
| 451 | checkNotNull(this.typeArguments[t]); |
| 452 | checkNotPrimitive(this.typeArguments[t]); |
| 453 | this.typeArguments[t] = canonicalize(this.typeArguments[t]); |
| 454 | } |
| 455 | } |
| 456 | |
| 457 | public Type[] getActualTypeArguments() { |
| 458 | return typeArguments.clone(); |
| 459 | } |
| 460 | |
| 461 | public Type getRawType() { |
| 462 | return rawType; |
| 463 | } |
| 464 | |
| 465 | public Type getOwnerType() { |
| 466 | return ownerType; |
| 467 | } |
| 468 | |
| 469 | @Override public boolean equals(Object other) { |
| 470 | return other instanceof ParameterizedType |
| 471 | && $Gson$Types.equals(this, (ParameterizedType) other); |
| 472 | } |
| 473 | |
| 474 | @Override public int hashCode() { |
| 475 | return Arrays.hashCode(typeArguments) |
| 476 | ^ rawType.hashCode() |
| 477 | ^ hashCodeOrZero(ownerType); |
| 478 | } |
| 479 | |
| 480 | @Override public String toString() { |
| 481 | StringBuilder stringBuilder = new StringBuilder(30 * (typeArguments.length + 1)); |
| 482 | stringBuilder.append(typeToString(rawType)); |
| 483 | |
| 484 | if (typeArguments.length == 0) { |
| 485 | return stringBuilder.toString(); |
| 486 | } |
| 487 | |
| 488 | stringBuilder.append("<").append(typeToString(typeArguments[0])); |
| 489 | for (int i = 1; i < typeArguments.length; i++) { |
| 490 | stringBuilder.append(", ").append(typeToString(typeArguments[i])); |
| 491 | } |
| 492 | return stringBuilder.append(">").toString(); |
| 493 | } |
| 494 | |
| 495 | private static final long serialVersionUID = 0; |
| 496 | } |
| 497 | |
| 498 | private static final class GenericArrayTypeImpl implements GenericArrayType, Serializable { |
| 499 | private final Type componentType; |
| 500 | |
| 501 | public GenericArrayTypeImpl(Type componentType) { |
| 502 | this.componentType = canonicalize(componentType); |
| 503 | } |
| 504 | |
| 505 | public Type getGenericComponentType() { |
| 506 | return componentType; |
| 507 | } |
| 508 | |
| 509 | @Override public boolean equals(Object o) { |
| 510 | return o instanceof GenericArrayType |
| 511 | && $Gson$Types.equals(this, (GenericArrayType) o); |
| 512 | } |
| 513 | |
| 514 | @Override public int hashCode() { |
| 515 | return componentType.hashCode(); |
| 516 | } |
| 517 | |
| 518 | @Override public String toString() { |
| 519 | return typeToString(componentType) + "[]"; |
| 520 | } |
| 521 | |
| 522 | private static final long serialVersionUID = 0; |
| 523 | } |
| 524 | |
| 525 | /** |
| 526 | * The WildcardType interface supports multiple upper bounds and multiple |
| 527 | * lower bounds. We only support what the Java 6 language needs - at most one |
| 528 | * bound. If a lower bound is set, the upper bound must be Object.class. |
| 529 | */ |
| 530 | private static final class WildcardTypeImpl implements WildcardType, Serializable { |
| 531 | private final Type upperBound; |
| 532 | private final Type lowerBound; |
| 533 | |
| 534 | public WildcardTypeImpl(Type[] upperBounds, Type[] lowerBounds) { |
| 535 | checkArgument(lowerBounds.length <= 1); |
| 536 | checkArgument(upperBounds.length == 1); |
| 537 | |
| 538 | if (lowerBounds.length == 1) { |
| 539 | checkNotNull(lowerBounds[0]); |
| 540 | checkNotPrimitive(lowerBounds[0]); |
| 541 | checkArgument(upperBounds[0] == Object.class); |
| 542 | this.lowerBound = canonicalize(lowerBounds[0]); |
| 543 | this.upperBound = Object.class; |
| 544 | |
| 545 | } else { |
| 546 | checkNotNull(upperBounds[0]); |
| 547 | checkNotPrimitive(upperBounds[0]); |
| 548 | this.lowerBound = null; |
| 549 | this.upperBound = canonicalize(upperBounds[0]); |
| 550 | } |
| 551 | } |
| 552 | |
| 553 | public Type[] getUpperBounds() { |
| 554 | return new Type[] { upperBound }; |
| 555 | } |
| 556 | |
| 557 | public Type[] getLowerBounds() { |
| 558 | return lowerBound != null ? new Type[] { lowerBound } : EMPTY_TYPE_ARRAY; |
| 559 | } |
| 560 | |
| 561 | @Override public boolean equals(Object other) { |
| 562 | return other instanceof WildcardType |
| 563 | && $Gson$Types.equals(this, (WildcardType) other); |
| 564 | } |
| 565 | |
| 566 | @Override public int hashCode() { |
| 567 | // this equals Arrays.hashCode(getLowerBounds()) ^ Arrays.hashCode(getUpperBounds()); |
| 568 | return (lowerBound != null ? 31 + lowerBound.hashCode() : 1) |
| 569 | ^ (31 + upperBound.hashCode()); |
| 570 | } |
| 571 | |
| 572 | @Override public String toString() { |
| 573 | if (lowerBound != null) { |
| 574 | return "? super " + typeToString(lowerBound); |
| 575 | } else if (upperBound == Object.class) { |
| 576 | return "?"; |
| 577 | } else { |
| 578 | return "? extends " + typeToString(upperBound); |
| 579 | } |
| 580 | } |
| 581 | |
| 582 | private static final long serialVersionUID = 0; |
| 583 | } |
| 584 | } |