diff options
Diffstat (limited to 'src/net/gcdc/asn1/uper/SimpleTypeResolver.java')
| -rw-r--r-- | src/net/gcdc/asn1/uper/SimpleTypeResolver.java | 515 |
1 files changed, 0 insertions, 515 deletions
diff --git a/src/net/gcdc/asn1/uper/SimpleTypeResolver.java b/src/net/gcdc/asn1/uper/SimpleTypeResolver.java deleted file mode 100644 index 64c2e5e..0000000 --- a/src/net/gcdc/asn1/uper/SimpleTypeResolver.java +++ /dev/null @@ -1,515 +0,0 @@ -package net.gcdc.asn1.uper;
-
-/*
- * Copyright 2002-2017 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-
-import java.lang.ref.Reference;
-import java.lang.ref.WeakReference;
-import java.lang.reflect.Array;
-import java.lang.reflect.Constructor;
-import java.lang.reflect.GenericArrayType;
-import java.lang.reflect.Member;
-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.Arrays;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.Map;
-import java.util.WeakHashMap;
-
-
-/**
- * Enhanced type resolution utilities.
- *
- * @author Jonathan Halterman
- */
-public final class SimpleTypeResolver {
- /** Cache of type variable/argument pairs */
- private static final Map<Class<?>, Reference<Map<TypeVariable<?>, Type>>> TYPE_VARIABLE_CACHE = Collections
- .synchronizedMap(new WeakHashMap<Class<?>, Reference<Map<TypeVariable<?>, Type>>>());
- private static volatile boolean CACHE_ENABLED = true;
- private static boolean RESOLVES_LAMBDAS;
- private static Method GET_CONSTANT_POOL;
- private static Method GET_CONSTANT_POOL_SIZE;
- private static Method GET_CONSTANT_POOL_METHOD_AT;
- private static final Map<String, Method> OBJECT_METHODS = new HashMap<String, Method>();
- private static final Map<Class<?>, Class<?>> PRIMITIVE_WRAPPERS;
- private static final Double JAVA_VERSION;
-
- static {
- JAVA_VERSION = Double.parseDouble(System.getProperty("java.specification.version", "0"));
-
- try {
-
- GET_CONSTANT_POOL = Class.class.getDeclaredMethod("getConstantPool");
- String constantPoolName = JAVA_VERSION < 9 ? "sun.reflect.ConstantPool" : "jdk.internal.reflect.ConstantPool";
- Class<?> constantPoolClass = Class.forName(constantPoolName);
- GET_CONSTANT_POOL_SIZE = constantPoolClass.getDeclaredMethod("getSize");
- GET_CONSTANT_POOL_METHOD_AT = constantPoolClass.getDeclaredMethod("getMethodAt", int.class);
-
- // setting the methods as accessible
- // additional checks - make sure we get a result when invoking the Class::getConstantPool and
- // ConstantPool::getSize on a class
- Object constantPool = GET_CONSTANT_POOL.invoke(Object.class);
- GET_CONSTANT_POOL_SIZE.invoke(constantPool);
-
- for (Method method : Object.class.getDeclaredMethods())
- OBJECT_METHODS.put(method.getName(), method);
-
- RESOLVES_LAMBDAS = true;
- } catch (Exception ignore) {
- }
-
- Map<Class<?>, Class<?>> types = new HashMap<Class<?>, Class<?>>();
- types.put(boolean.class, Boolean.class);
- types.put(byte.class, Byte.class);
- types.put(char.class, Character.class);
- types.put(double.class, Double.class);
- types.put(float.class, Float.class);
- types.put(int.class, Integer.class);
- types.put(long.class, Long.class);
- types.put(short.class, Short.class);
- types.put(void.class, Void.class);
- PRIMITIVE_WRAPPERS = Collections.unmodifiableMap(types);
- }
-
- /** An unknown type. */
- public static final class Unknown {
- private Unknown() {
- }
- }
-
- /**
- * Enables the internal caching of resolved TypeVariables.
- */
- public static void enableCache() {
- CACHE_ENABLED = true;
- }
-
- /**
- * Disables the internal caching of resolved TypeVariables.
- */
- public static void disableCache() {
- TYPE_VARIABLE_CACHE.clear();
- CACHE_ENABLED = false;
- }
-
- /**
- * Returns the raw class representing the argument for the {@code type} using type variable information from the
- * {@code subType}. If no arguments can be resolved then {@code Unknown.class} is returned.
- *
- * @param type to resolve argument for
- * @param subType to extract type variable information from
- * @return argument for {@code type} else {@link Unknown}.class if no type arguments are declared
- * @throws IllegalArgumentException if more or less than one argument is resolved for the {@code type}
- */
- public static <T, S extends T> Class<?> resolveRawArgument(Class<T> type, Class<S> subType) {
- return resolveRawArgument(resolveGenericType(type, subType), subType);
- }
-
- /**
- * Returns the raw class representing the argument for the {@code genericType} using type variable information from
- * the {@code subType}. If {@code genericType} is an instance of class, then {@code genericType} is returned. If no
- * arguments can be resolved then {@code Unknown.class} is returned.
- *
- * @param genericType to resolve argument for
- * @param subType to extract type variable information from
- * @return argument for {@code genericType} else {@link Unknown}.class if no type arguments are declared
- * @throws IllegalArgumentException if more or less than one argument is resolved for the {@code genericType}
- */
- public static Class<?> resolveRawArgument(Type genericType, Class<?> subType) {
- Class<?>[] arguments = resolveRawArguments(genericType, subType);
- if (arguments == null)
- return Unknown.class;
-
- if (arguments.length != 1)
- throw new IllegalArgumentException(
- "Expected 1 argument for generic type " + genericType + " but found " + arguments.length);
-
- return arguments[0];
- }
-
- /**
- * Returns an array of raw classes representing arguments for the {@code type} using type variable information from
- * the {@code subType}. Arguments for {@code type} that cannot be resolved are returned as {@code Unknown.class}. If
- * no arguments can be resolved then {@code null} is returned.
- *
- * @param type to resolve arguments for
- * @param subType to extract type variable information from
- * @return array of raw classes representing arguments for the {@code type} else {@code null} if no type arguments are
- * declared
- */
- public static <T, S extends T> Class<?>[] resolveRawArguments(Class<T> type, Class<S> subType) {
- return resolveRawArguments(resolveGenericType(type, subType), subType);
- }
-
- /**
- * Returns an array of raw classes representing arguments for the {@code genericType} using type variable information
- * from the {@code subType}. Arguments for {@code genericType} that cannot be resolved are returned as
- * {@code Unknown.class}. If no arguments can be resolved then {@code null} is returned.
- *
- * @param genericType to resolve arguments for
- * @param subType to extract type variable information from
- * @return array of raw classes representing arguments for the {@code genericType} else {@code null} if no type
- * arguments are declared
- */
- public static Class<?>[] resolveRawArguments(Type genericType, Class<?> subType) {
- Class<?>[] result = null;
- Class<?> functionalInterface = null;
-
- // Handle lambdas
- if (RESOLVES_LAMBDAS && subType.isSynthetic()) {
- Class<?> fi = genericType instanceof ParameterizedType
- && ((ParameterizedType) genericType).getRawType() instanceof Class
- ? (Class<?>) ((ParameterizedType) genericType).getRawType()
- : genericType instanceof Class ? (Class<?>) genericType : null;
- if (fi != null && fi.isInterface())
- functionalInterface = fi;
- }
-
- if (genericType instanceof ParameterizedType) {
- ParameterizedType paramType = (ParameterizedType) genericType;
- Type[] arguments = paramType.getActualTypeArguments();
- result = new Class[arguments.length];
- for (int i = 0; i < arguments.length; i++)
- result[i] = resolveRawClass(arguments[i], subType, functionalInterface);
- } else if (genericType instanceof TypeVariable) {
- result = new Class[1];
- result[0] = resolveRawClass(genericType, subType, functionalInterface);
- } else if (genericType instanceof Class) {
- TypeVariable<?>[] typeParams = ((Class<?>) genericType).getTypeParameters();
- result = new Class[typeParams.length];
- for (int i = 0; i < typeParams.length; i++)
- result[i] = resolveRawClass(typeParams[i], subType, functionalInterface);
- }
-
- return result;
- }
-
- /**
- * Returns the generic {@code type} using type variable information from the {@code subType} else {@code null} if the
- * generic type cannot be resolved.
- *
- * @param type to resolve generic type for
- * @param subType to extract type variable information from
- * @return generic {@code type} else {@code null} if it cannot be resolved
- */
- public static Type resolveGenericType(Class<?> type, Type subType) {
- Class<?> rawType;
- if (subType instanceof ParameterizedType)
- rawType = (Class<?>) ((ParameterizedType) subType).getRawType();
- else
- rawType = (Class<?>) subType;
-
- if (type.equals(rawType))
- return subType;
-
- Type result;
- if (type.isInterface()) {
- for (Type superInterface : rawType.getGenericInterfaces())
- if (superInterface != null && !superInterface.equals(Object.class))
- if ((result = resolveGenericType(type, superInterface)) != null)
- return result;
- }
-
- Type superClass = rawType.getGenericSuperclass();
- if (superClass != null && !superClass.equals(Object.class))
- if ((result = resolveGenericType(type, superClass)) != null)
- return result;
-
- return null;
- }
-
- /**
- * Resolves the raw class for the {@code genericType}, using the type variable information from the {@code subType}
- * else {@link Unknown} if the raw class cannot be resolved.
- *
- * @param genericType to resolve raw class for
- * @param subType to extract type variable information from
- * @return raw class for the {@code genericType} else {@link Unknown} if it cannot be resolved
- */
- public static Class<?> resolveRawClass(Type genericType, Class<?> subType) {
- return resolveRawClass(genericType, subType, null);
- }
-
- private static Class<?> resolveRawClass(Type genericType, Class<?> subType, Class<?> functionalInterface) {
- if (genericType instanceof Class) {
- return (Class<?>) genericType;
- } else if (genericType instanceof ParameterizedType) {
- return resolveRawClass(((ParameterizedType) genericType).getRawType(), subType, functionalInterface);
- } else if (genericType instanceof GenericArrayType) {
- GenericArrayType arrayType = (GenericArrayType) genericType;
- Class<?> component = resolveRawClass(arrayType.getGenericComponentType(), subType, functionalInterface);
- return Array.newInstance(component, 0).getClass();
- } else if (genericType instanceof TypeVariable) {
- TypeVariable<?> variable = (TypeVariable<?>) genericType;
- genericType = getTypeVariableMap(subType, functionalInterface).get(variable);
- genericType = genericType == null ? resolveBound(variable)
- : resolveRawClass(genericType, subType, functionalInterface);
- }
-
- return genericType instanceof Class ? (Class<?>) genericType : Unknown.class;
- }
-
- private static Map<TypeVariable<?>, Type> getTypeVariableMap(final Class<?> targetType,
- Class<?> functionalInterface) {
- Reference<Map<TypeVariable<?>, Type>> ref = TYPE_VARIABLE_CACHE.get(targetType);
- Map<TypeVariable<?>, Type> map = ref != null ? ref.get() : null;
-
- if (map == null) {
- map = new HashMap<TypeVariable<?>, Type>();
-
- // Populate lambdas
- if (functionalInterface != null)
- populateLambdaArgs(functionalInterface, targetType, map);
-
- // Populate interfaces
- populateSuperTypeArgs(targetType.getGenericInterfaces(), map, functionalInterface != null);
-
- // Populate super classes and interfaces
- Type genericType = targetType.getGenericSuperclass();
- Class<?> type = targetType.getSuperclass();
- while (type != null && !Object.class.equals(type)) {
- if (genericType instanceof ParameterizedType)
- populateTypeArgs((ParameterizedType) genericType, map, false);
- populateSuperTypeArgs(type.getGenericInterfaces(), map, false);
-
- genericType = type.getGenericSuperclass();
- type = type.getSuperclass();
- }
-
- // Populate enclosing classes
- type = targetType;
- while (type.isMemberClass()) {
- genericType = type.getGenericSuperclass();
- if (genericType instanceof ParameterizedType)
- populateTypeArgs((ParameterizedType) genericType, map, functionalInterface != null);
-
- type = type.getEnclosingClass();
- }
-
- if (CACHE_ENABLED)
- TYPE_VARIABLE_CACHE.put(targetType, new WeakReference<Map<TypeVariable<?>, Type>>(map));
- }
-
- return map;
- }
-
- /**
- * Populates the {@code map} with with variable/argument pairs for the given {@code types}.
- */
- private static void populateSuperTypeArgs(final Type[] types, final Map<TypeVariable<?>, Type> map,
- boolean depthFirst) {
- for (Type type : types) {
- if (type instanceof ParameterizedType) {
- ParameterizedType parameterizedType = (ParameterizedType) type;
- if (!depthFirst)
- populateTypeArgs(parameterizedType, map, depthFirst);
- Type rawType = parameterizedType.getRawType();
- if (rawType instanceof Class)
- populateSuperTypeArgs(((Class<?>) rawType).getGenericInterfaces(), map, depthFirst);
- if (depthFirst)
- populateTypeArgs(parameterizedType, map, depthFirst);
- } else if (type instanceof Class) {
- populateSuperTypeArgs(((Class<?>) type).getGenericInterfaces(), map, depthFirst);
- }
- }
- }
-
- /**
- * Populates the {@code map} with variable/argument pairs for the given {@code type}.
- */
- private static void populateTypeArgs(ParameterizedType type, Map<TypeVariable<?>, Type> map, boolean depthFirst) {
- if (type.getRawType() instanceof Class) {
- TypeVariable<?>[] typeVariables = ((Class<?>) type.getRawType()).getTypeParameters();
- Type[] typeArguments = type.getActualTypeArguments();
-
- if (type.getOwnerType() != null) {
- Type owner = type.getOwnerType();
- if (owner instanceof ParameterizedType)
- populateTypeArgs((ParameterizedType) owner, map, depthFirst);
- }
-
- for (int i = 0; i < typeArguments.length; i++) {
- TypeVariable<?> variable = typeVariables[i];
- Type typeArgument = typeArguments[i];
-
- if (typeArgument instanceof Class) {
- map.put(variable, typeArgument);
- } else if (typeArgument instanceof GenericArrayType) {
- map.put(variable, typeArgument);
- } else if (typeArgument instanceof ParameterizedType) {
- map.put(variable, typeArgument);
- } else if (typeArgument instanceof TypeVariable) {
- TypeVariable<?> typeVariableArgument = (TypeVariable<?>) typeArgument;
- if (depthFirst) {
- Type existingType = map.get(variable);
- if (existingType != null) {
- map.put(typeVariableArgument, existingType);
- continue;
- }
- }
-
- Type resolvedType = map.get(typeVariableArgument);
- if (resolvedType == null)
- resolvedType = resolveBound(typeVariableArgument);
- map.put(variable, resolvedType);
- }
- }
- }
- }
-
- /**
- * Resolves the first bound for the {@code typeVariable}, returning {@code Unknown.class} if none can be resolved.
- */
- public static Type resolveBound(TypeVariable<?> typeVariable) {
- Type[] bounds = typeVariable.getBounds();
- if (bounds.length == 0)
- return Unknown.class;
-
- Type bound = bounds[0];
- if (bound instanceof TypeVariable)
- bound = resolveBound((TypeVariable<?>) bound);
-
- return bound == Object.class ? Unknown.class : bound;
- }
-
- /**
- * Populates the {@code map} with variable/argument pairs for the {@code functionalInterface}.
- */
- private static void populateLambdaArgs(Class<?> functionalInterface, final Class<?> lambdaType,
- Map<TypeVariable<?>, Type> map) {
- if (RESOLVES_LAMBDAS) {
- // Find SAM
- for (Method m : functionalInterface.getMethods()) {
- if (!isDefaultMethod(m) && !Modifier.isStatic(m.getModifiers()) && !m.isBridge()) {
- // Skip methods that override Object.class
- Method objectMethod = OBJECT_METHODS.get(m.getName());
- if (objectMethod != null && Arrays.equals(m.getTypeParameters(), objectMethod.getTypeParameters()))
- continue;
-
- // Get functional interface's type params
- Type returnTypeVar = m.getGenericReturnType();
- Type[] paramTypeVars = m.getGenericParameterTypes();
-
- Member member = getMemberRef(lambdaType);
- if (member == null)
- return;
-
- // Populate return type argument
- if (returnTypeVar instanceof TypeVariable) {
- Class<?> returnType = member instanceof Method ? ((Method) member).getReturnType()
- : ((Constructor<?>) member).getDeclaringClass();
- returnType = wrapPrimitives(returnType);
- if (!returnType.equals(Void.class))
- map.put((TypeVariable<?>) returnTypeVar, returnType);
- }
-
- Class<?>[] arguments = member instanceof Method ? ((Method) member).getParameterTypes()
- : ((Constructor<?>) member).getParameterTypes();
-
- // Populate object type from arbitrary object method reference
- int paramOffset = 0;
- if (paramTypeVars.length > 0 && paramTypeVars[0] instanceof TypeVariable
- && paramTypeVars.length == arguments.length + 1) {
- Class<?> instanceType = member.getDeclaringClass();
- map.put((TypeVariable<?>) paramTypeVars[0], instanceType);
- paramOffset = 1;
- }
-
- // Handle additional arguments that are captured from the lambda's enclosing scope
- int argOffset = 0;
- if (paramTypeVars.length < arguments.length) {
- argOffset = arguments.length - paramTypeVars.length;
- }
-
- // Populate type arguments
- for (int i = 0; i + argOffset < arguments.length; i++) {
- if (paramTypeVars[i] instanceof TypeVariable)
- map.put((TypeVariable<?>) paramTypeVars[i + paramOffset], wrapPrimitives(arguments[i + argOffset]));
- }
-
- return;
- }
- }
- }
- }
-
- private static boolean isDefaultMethod(Method m) {
- //CG
- return false;
- //return JAVA_VERSION >= 1.8 && m.isDefault();
- }
-
- private static Member getMemberRef(Class<?> type) {
- Object constantPool;
- try {
- constantPool = GET_CONSTANT_POOL.invoke(type);
- } catch (Exception ignore) {
- return null;
- }
-
- Member result = null;
- for (int i = getConstantPoolSize(constantPool) - 1; i >= 0; i--) {
- Member member = getConstantPoolMethodAt(constantPool, i);
- // Skip SerializedLambda constructors and members of the "type" class
- if (member == null
- || (member instanceof Constructor
- && member.getDeclaringClass().getName().equals("java.lang.invoke.SerializedLambda"))
- || member.getDeclaringClass().isAssignableFrom(type))
- continue;
-
- result = member;
-
- // Return if not valueOf method
- if (!(member instanceof Method) || !isAutoBoxingMethod((Method) member))
- break;
- }
-
- return result;
- }
-
- private static boolean isAutoBoxingMethod(Method method) {
- Class<?>[] parameters = method.getParameterTypes();
- return method.getName().equals("valueOf") && parameters.length == 1 && parameters[0].isPrimitive()
- && wrapPrimitives(parameters[0]).equals(method.getDeclaringClass());
- }
-
- private static Class<?> wrapPrimitives(Class<?> clazz) {
- return clazz.isPrimitive() ? PRIMITIVE_WRAPPERS.get(clazz) : clazz;
- }
-
- private static int getConstantPoolSize(Object constantPool) {
- try {
- return (Integer) GET_CONSTANT_POOL_SIZE.invoke(constantPool);
- } catch (Exception ignore) {
- return 0;
- }
- }
-
- private static Member getConstantPoolMethodAt(Object constantPool, int i) {
- try {
- return (Member) GET_CONSTANT_POOL_METHOD_AT.invoke(constantPool, i);
- } catch (Exception ignore) {
- return null;
- }
- }
-}
-
|