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@@ -1,325 +0,0 @@
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/*
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* Copyright 2002-2010 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.data.util;
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import java.lang.ref.Reference;
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import java.lang.ref.WeakReference;
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import java.lang.reflect.Array;
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import java.lang.reflect.GenericArrayType;
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import java.lang.reflect.ParameterizedType;
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import java.lang.reflect.Type;
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import java.lang.reflect.TypeVariable;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.WeakHashMap;
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import org.springframework.core.MethodParameter;
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import org.springframework.util.Assert;
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/**
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* Copy of Spring's {@link org.springframework.core.GenericTypeResolver}. Needed until
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* {@link #getTypeVariableMap(Class)} gets public.
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* <p/>
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* TODO: remove that class, as soon as Spring 3.0.6 gets released.
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*
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* @see SPR-8005
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*/
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@SuppressWarnings({ "rawtypes", "unchecked" })
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abstract class GenericTypeResolver {
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/**
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* Cache from Class to TypeVariable Map
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*/
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private static final Map<Class, Reference<Map<TypeVariable, Type>>> typeVariableCache = Collections
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.synchronizedMap(new WeakHashMap<Class, Reference<Map<TypeVariable, Type>>>());
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/**
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* Determine the target type for the given parameter specification.
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*
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* @param methodParam the method parameter specification
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* @return the corresponding generic parameter type
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*/
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public static Type getTargetType(MethodParameter methodParam) {
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Assert.notNull(methodParam, "MethodParameter must not be null");
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if (methodParam.getConstructor() != null) {
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return methodParam.getConstructor().getGenericParameterTypes()[methodParam.getParameterIndex()];
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} else {
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if (methodParam.getParameterIndex() >= 0) {
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return methodParam.getMethod().getGenericParameterTypes()[methodParam.getParameterIndex()];
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} else {
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return methodParam.getMethod().getGenericReturnType();
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}
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}
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}
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/**
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* Resolve the single type argument of the given generic interface against the given target class which is assumed to
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* implement the generic interface and possibly declare a concrete type for its type variable.
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*
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* @param clazz the target class to check against
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* @param genericIfc the generic interface or superclass to resolve the type argument from
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* @return the resolved type of the argument, or <code>null</code> if not resolvable
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*/
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public static Class<?> resolveTypeArgument(Class clazz, Class genericIfc) {
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Class[] typeArgs = resolveTypeArguments(clazz, genericIfc);
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if (typeArgs == null) {
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return null;
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}
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if (typeArgs.length != 1) {
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throw new IllegalArgumentException("Expected 1 type argument on generic interface [" + genericIfc.getName()
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+ "] but found " + typeArgs.length);
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}
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return typeArgs[0];
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}
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/**
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* Resolve the type arguments of the given generic interface against the given target class which is assumed to
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* implement the generic interface and possibly declare concrete types for its type variables.
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*
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* @param clazz the target class to check against
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* @param genericIfc the generic interface or superclass to resolve the type argument from
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* @return the resolved type of each argument, with the array size matching the number of actual type arguments, or
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* <code>null</code> if not resolvable
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*/
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public static Class[] resolveTypeArguments(Class clazz, Class genericIfc) {
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return doResolveTypeArguments(clazz, clazz, genericIfc);
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}
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private static Class[] doResolveTypeArguments(Class ownerClass, Class classToIntrospect, Class genericIfc) {
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while (classToIntrospect != null) {
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if (genericIfc.isInterface()) {
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Type[] ifcs = classToIntrospect.getGenericInterfaces();
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for (Type ifc : ifcs) {
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Class[] result = doResolveTypeArguments(ownerClass, ifc, genericIfc);
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if (result != null) {
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return result;
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}
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}
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} else {
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Class[] result = doResolveTypeArguments(ownerClass, classToIntrospect.getGenericSuperclass(), genericIfc);
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if (result != null) {
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return result;
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}
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}
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classToIntrospect = classToIntrospect.getSuperclass();
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}
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return null;
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}
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private static Class[] doResolveTypeArguments(Class ownerClass, Type ifc, Class genericIfc) {
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if (ifc instanceof ParameterizedType) {
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ParameterizedType paramIfc = (ParameterizedType) ifc;
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Type rawType = paramIfc.getRawType();
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if (genericIfc.equals(rawType)) {
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Type[] typeArgs = paramIfc.getActualTypeArguments();
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Class[] result = new Class[typeArgs.length];
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for (int i = 0; i < typeArgs.length; i++) {
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Type arg = typeArgs[i];
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result[i] = extractClass(ownerClass, arg);
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}
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return result;
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} else if (genericIfc.isAssignableFrom((Class) rawType)) {
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return doResolveTypeArguments(ownerClass, (Class) rawType, genericIfc);
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}
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} else if (genericIfc.isAssignableFrom((Class) ifc)) {
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return doResolveTypeArguments(ownerClass, (Class) ifc, genericIfc);
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}
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return null;
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}
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/**
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* Extract a class instance from given Type.
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*/
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private static Class extractClass(Class ownerClass, Type arg) {
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if (arg instanceof ParameterizedType) {
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return extractClass(ownerClass, ((ParameterizedType) arg).getRawType());
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} else if (arg instanceof GenericArrayType) {
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GenericArrayType gat = (GenericArrayType) arg;
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Type gt = gat.getGenericComponentType();
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Class<?> componentClass = extractClass(ownerClass, gt);
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return Array.newInstance(componentClass, 0).getClass();
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} else if (arg instanceof TypeVariable) {
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TypeVariable tv = (TypeVariable) arg;
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arg = getTypeVariableMap(ownerClass).get(tv);
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if (arg == null) {
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arg = extractBoundForTypeVariable(tv);
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} else {
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arg = extractClass(ownerClass, arg);
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}
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}
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return (arg instanceof Class ? (Class) arg : Object.class);
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}
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/**
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* Resolve the specified generic type against the given TypeVariable map.
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*
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* @param genericType the generic type to resolve
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* @param typeVariableMap the TypeVariable Map to resolved against
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* @return the type if it resolves to a Class, or <code>Object.class</code> otherwise
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*/
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static Class resolveType(Type genericType, Map<TypeVariable, Type> typeVariableMap) {
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Type rawType = getRawType(genericType, typeVariableMap);
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return (rawType instanceof Class ? (Class) rawType : Object.class);
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}
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/**
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* Determine the raw type for the given generic parameter type.
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*
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* @param genericType the generic type to resolve
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* @param typeVariableMap the TypeVariable Map to resolved against
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* @return the resolved raw type
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*/
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static Type getRawType(Type genericType, Map<TypeVariable, Type> typeVariableMap) {
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Type resolvedType = genericType;
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if (genericType instanceof TypeVariable) {
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TypeVariable tv = (TypeVariable) genericType;
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resolvedType = typeVariableMap.get(tv);
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if (resolvedType == null) {
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resolvedType = extractBoundForTypeVariable(tv);
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}
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}
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if (resolvedType instanceof ParameterizedType) {
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return ((ParameterizedType) resolvedType).getRawType();
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} else {
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return resolvedType;
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}
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}
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/**
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* Build a mapping of {@link TypeVariable#getName TypeVariable names} to concrete {@link Class} for the specified
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* {@link Class}. Searches all super types, enclosing types and interfaces.
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*/
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static Map<TypeVariable, Type> getTypeVariableMap(Class clazz) {
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Reference<Map<TypeVariable, Type>> ref = typeVariableCache.get(clazz);
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Map<TypeVariable, Type> typeVariableMap = (ref != null ? ref.get() : null);
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if (typeVariableMap == null) {
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typeVariableMap = new HashMap<TypeVariable, Type>();
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// interfaces
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extractTypeVariablesFromGenericInterfaces(clazz.getGenericInterfaces(), typeVariableMap);
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// super class
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Type genericType = clazz.getGenericSuperclass();
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Class type = clazz.getSuperclass();
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while (type != null && !Object.class.equals(type)) {
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if (genericType instanceof ParameterizedType) {
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ParameterizedType pt = (ParameterizedType) genericType;
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populateTypeMapFromParameterizedType(pt, typeVariableMap);
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}
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extractTypeVariablesFromGenericInterfaces(type.getGenericInterfaces(), typeVariableMap);
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genericType = type.getGenericSuperclass();
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type = type.getSuperclass();
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}
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// enclosing class
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type = clazz;
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while (type.isMemberClass()) {
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genericType = type.getGenericSuperclass();
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if (genericType instanceof ParameterizedType) {
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ParameterizedType pt = (ParameterizedType) genericType;
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populateTypeMapFromParameterizedType(pt, typeVariableMap);
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}
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type = type.getEnclosingClass();
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}
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typeVariableCache.put(clazz, new WeakReference<Map<TypeVariable, Type>>(typeVariableMap));
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}
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return typeVariableMap;
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}
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/**
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* Extracts the bound <code>Type</code> for a given {@link TypeVariable}.
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*/
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static Type extractBoundForTypeVariable(TypeVariable typeVariable) {
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Type[] bounds = typeVariable.getBounds();
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if (bounds.length == 0) {
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return Object.class;
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}
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Type bound = bounds[0];
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if (bound instanceof TypeVariable) {
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bound = extractBoundForTypeVariable((TypeVariable) bound);
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}
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return bound;
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}
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private static void extractTypeVariablesFromGenericInterfaces(Type[] genericInterfaces,
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Map<TypeVariable, Type> typeVariableMap) {
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for (Type genericInterface : genericInterfaces) {
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if (genericInterface instanceof ParameterizedType) {
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ParameterizedType pt = (ParameterizedType) genericInterface;
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populateTypeMapFromParameterizedType(pt, typeVariableMap);
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if (pt.getRawType() instanceof Class) {
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extractTypeVariablesFromGenericInterfaces(((Class) pt.getRawType()).getGenericInterfaces(), typeVariableMap);
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}
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} else if (genericInterface instanceof Class) {
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extractTypeVariablesFromGenericInterfaces(((Class) genericInterface).getGenericInterfaces(), typeVariableMap);
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}
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}
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}
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/**
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* Read the {@link TypeVariable TypeVariables} from the supplied {@link ParameterizedType} and add mappings
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* corresponding to the {@link TypeVariable#getName TypeVariable name} -> concrete type to the supplied {@link Map}.
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* <p/>
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* Consider this case:
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* <p/>
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*
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* <pre class="code>
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* public interface Foo<S, T> {
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* ..
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* }
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* <p/>
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* public class FooImpl implements Foo<String, Integer> {
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* ..
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* }
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* </pre>
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* <p/>
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* For '<code>FooImpl</code>' the following mappings would be added to the {@link Map}: {S=java.lang.String,
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* T=java.lang.Integer}.
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*/
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private static void populateTypeMapFromParameterizedType(ParameterizedType type,
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Map<TypeVariable, Type> typeVariableMap) {
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if (type.getRawType() instanceof Class) {
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Type[] actualTypeArguments = type.getActualTypeArguments();
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TypeVariable[] typeVariables = ((Class) type.getRawType()).getTypeParameters();
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for (int i = 0; i < actualTypeArguments.length; i++) {
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Type actualTypeArgument = actualTypeArguments[i];
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TypeVariable variable = typeVariables[i];
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if (actualTypeArgument instanceof Class) {
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typeVariableMap.put(variable, actualTypeArgument);
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} else if (actualTypeArgument instanceof GenericArrayType) {
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typeVariableMap.put(variable, actualTypeArgument);
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} else if (actualTypeArgument instanceof ParameterizedType) {
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typeVariableMap.put(variable, actualTypeArgument);
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} else if (actualTypeArgument instanceof TypeVariable) {
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// We have a type that is parameterized at instantiation time
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// the nearest match on the bridge method will be the bounded type.
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TypeVariable typeVariableArgument = (TypeVariable) actualTypeArgument;
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Type resolvedType = typeVariableMap.get(typeVariableArgument);
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if (resolvedType == null) {
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resolvedType = extractBoundForTypeVariable(typeVariableArgument);
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}
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typeVariableMap.put(variable, resolvedType);
|
|
|
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}
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|
|
|
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}
|
|
|
|
|
}
|
|
|
|
|
}
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|
|
|
|
|
|
|
|
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}
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Oliver Gierke