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Accept non-generic type match as a fallback

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DefaultListableBeanFactory performs a fallback check for autowire candidates now, which GenericTypeAwareAutowireCandidateResolver implements to accept raw type matches if the target class has unresolvable type variables. Full generic matches are still preferred; the BeanFactory will only start looking for fallback matches if the first pass led to an empty result.

Issue: SPR-10993
Issue: SPR-11004
This commit is contained in:
Juergen Hoeller
2013-10-25 17:52:38 +02:00
parent 02f9b713b0
commit 0851766738
8 changed files with 332 additions and 122 deletions
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42
spring-core/src/main/java/org/springframework/core/GenericTypeResolver.java
View File

@@ -251,27 +251,13 @@ public abstract class GenericTypeResolver {
/**
* Resolve the specified generic type against the given TypeVariable map.
* @param genericType the generic type to resolve
* @param typeVariableMap the TypeVariable Map to resolved against
* @param map the TypeVariable Map to resolved against
* @return the type if it resolves to a Class, or {@code Object.class} otherwise
* @deprecated as of Spring 4.0 in favor of {@link ResolvableType}
*/
@Deprecated
public static Class<?> resolveType(Type genericType, final Map<TypeVariable, Type> typeVariableMap) {
ResolvableType.VariableResolver variableResolver = new ResolvableType.VariableResolver() {
@Override
public ResolvableType resolveVariable(TypeVariable<?> variable) {
Type type = typeVariableMap.get(variable);
return (type == null ? null : ResolvableType.forType(type));
}
@Override
public Object getSource() {
return typeVariableMap;
}
};
return ResolvableType.forType(genericType, variableResolver).resolve(Object.class);
public static Class<?> resolveType(Type genericType, Map<TypeVariable, Type> map) {
return ResolvableType.forType(genericType, new TypeVariableMapVariableResolver(map)).resolve(Object.class);
}
/**
@@ -315,4 +301,26 @@ public abstract class GenericTypeResolver {
}
}
@SuppressWarnings("serial")
private static class TypeVariableMapVariableResolver implements ResolvableType.VariableResolver {
private final Map<TypeVariable, Type> typeVariableMap;
public TypeVariableMapVariableResolver(Map<TypeVariable, Type> typeVariableMap) {
this.typeVariableMap = typeVariableMap;
}
@Override
public ResolvableType resolveVariable(TypeVariable<?> variable) {
Type type = this.typeVariableMap.get(variable);
return (type != null ? ResolvableType.forType(type) : null);
}
@Override
public Object getSource() {
return this.typeVariableMap;
}
}
}

3
spring-core/src/main/java/org/springframework/core/MethodParameter.java
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@@ -265,7 +265,8 @@ public class MethodParameter {
Type type = getGenericParameterType();
if (type instanceof ParameterizedType) {
Integer index = getTypeIndexForCurrentLevel();
Type arg = ((ParameterizedType) type).getActualTypeArguments()[index != null ? index : 0];
Type[] args = ((ParameterizedType) type).getActualTypeArguments();
Type arg = args[index != null ? index : args.length - 1];
if (arg instanceof Class) {
return (Class) arg;
}

202
spring-core/src/main/java/org/springframework/core/ResolvableType.java
View File

@@ -105,8 +105,7 @@ public final class ResolvableType implements Serializable {
private boolean isResolved = false;
/**
* Late binding stored copy of the resolved value (valid when {@link #isResolved} is
* true).
* Late binding stored copy of the resolved value (valid when {@link #isResolved} is true).
*/
private Class<?> resolved;
@@ -116,7 +115,6 @@ public final class ResolvableType implements Serializable {
private final ResolvableType componentType;
/**
* Private constructor used to create a new {@link ResolvableType}.
* @param type the underlying java type (may only be {@code null} for {@link #NONE})
@@ -131,13 +129,25 @@ public final class ResolvableType implements Serializable {
/**
* Return the underling java {@link Type} being managed. With the exception of
* Return the underling Java {@link Type} being managed. With the exception of
* the {@link #NONE} constant, this method will never return {@code null}.
*/
public Type getType() {
return this.type;
}
/**
* Return the underlying Java {@link Class} being managed, if available;
* otherwise {@code null}.
*/
public Class<?> getRawClass() {
Type rawType = this.type;
if (rawType instanceof ParameterizedType) {
rawType = ((ParameterizedType) rawType).getRawType();
}
return (rawType instanceof Class ? (Class) rawType : null);
}
/**
* Determines if this {@code ResolvableType} is assignable from the specified
* {@code type}. Attempts to follow the same rules as the Java compiler, considering
@@ -161,8 +171,7 @@ public final class ResolvableType implements Serializable {
// Deal with array by delegating to the component type
if (isArray()) {
return (type.isArray() && getComponentType().isAssignableFrom(
type.getComponentType()));
return (type.isArray() && getComponentType().isAssignableFrom(type.getComponentType()));
}
// Deal with wildcard bounds
@@ -171,8 +180,8 @@ public final class ResolvableType implements Serializable {
// in the from X is assignable to <? extends Number>
if (typeBounds != null) {
return (ourBounds != null && ourBounds.isSameKind(typeBounds)
&& ourBounds.isAssignableFrom(typeBounds.getBounds()));
return (ourBounds != null && ourBounds.isSameKind(typeBounds) &&
ourBounds.isAssignableFrom(typeBounds.getBounds()));
}
// in the form <? extends Number> is assignable to X ...
@@ -189,8 +198,7 @@ public final class ResolvableType implements Serializable {
// Recursively check each generic
for (int i = 0; i < getGenerics().length; i++) {
rtn &= getGeneric(i).isAssignableFrom(
type.as(resolve(Object.class)).getGeneric(i), true);
rtn &= getGeneric(i).isAssignableFrom(type.as(resolve(Object.class)).getGeneric(i), true);
}
return rtn;
@@ -228,8 +236,7 @@ public final class ResolvableType implements Serializable {
return forType(componentType, this.variableResolver);
}
if (this.type instanceof GenericArrayType) {
return forType(((GenericArrayType) this.type).getGenericComponentType(),
this.variableResolver);
return forType(((GenericArrayType) this.type).getGenericComponentType(), this.variableResolver);
}
return resolveType().getComponentType();
}
@@ -291,7 +298,7 @@ public final class ResolvableType implements Serializable {
* @see #getInterfaces()
*/
public ResolvableType getSuperType() {
final Class<?> resolved = resolve();
Class<?> resolved = resolve();
if (resolved == null || resolved.getGenericSuperclass() == null) {
return NONE;
}
@@ -305,7 +312,7 @@ public final class ResolvableType implements Serializable {
* @see #getSuperType()
*/
public ResolvableType[] getInterfaces() {
final Class<?> resolved = resolve();
Class<?> resolved = resolve();
if (resolved == null || ObjectUtils.isEmpty(resolved.getGenericInterfaces())) {
return EMPTY_TYPES_ARRAY;
}
@@ -321,6 +328,35 @@ public final class ResolvableType implements Serializable {
return (getGenerics().length > 0);
}
/**
* Determine whether the underlying type has unresolvable generics:
* either through an unresolvable type variable on the type itself
* or through implementing a generic interface in a raw fashion,
* i.e. without substituting that interface's type variables.
* The result will be {@code true} only in those two scenarios.
*/
public boolean hasUnresolvableGenerics() {
ResolvableType[] generics = getGenerics();
for (ResolvableType generic : generics) {
if (generic.resolve() == null) {
return true;
}
}
Class<?> resolved = resolve();
Type[] ifcs = resolved.getGenericInterfaces();
for (Type ifc : ifcs) {
if (ifc instanceof Class) {
if (forClass((Class) ifc).hasGenerics()) {
return true;
}
}
}
if (resolved.getGenericSuperclass() != null) {
return getSuperType().hasUnresolvableGenerics();
}
return false;
}
/**
* Return a {@link ResolvableType} for the specified nesting level. See
* {@link #getNested(int, Map)} for details.
@@ -362,8 +398,7 @@ public final class ResolvableType implements Serializable {
while (result != ResolvableType.NONE && !result.hasGenerics()) {
result = result.getSuperType();
}
Integer index = (typeIndexesPerLevel == null ? null
: typeIndexesPerLevel.get(i));
Integer index = (typeIndexesPerLevel != null ? typeIndexesPerLevel.get(i) : null);
index = (index == null ? result.getGenerics().length - 1 : index);
result = result.getGeneric(index);
}
@@ -515,10 +550,8 @@ public final class ResolvableType implements Serializable {
* it cannot be serialized.
*/
ResolvableType resolveType() {
if (this.type instanceof ParameterizedType) {
return forType(((ParameterizedType) this.type).getRawType(),
this.variableResolver);
return forType(((ParameterizedType) this.type).getRawType(), this.variableResolver);
}
if (this.type instanceof WildcardType) {
@@ -535,7 +568,7 @@ public final class ResolvableType implements Serializable {
// Try default variable resolution
if (this.variableResolver != null) {
ResolvableType resolved = this.variableResolver.resolveVariable(variable);
if(resolved != null) {
if (resolved != null) {
return resolved;
}
}
@@ -555,7 +588,6 @@ public final class ResolvableType implements Serializable {
}
private ResolvableType resolveVariable(TypeVariable<?> variable) {
if (this.type instanceof TypeVariable) {
return resolveType().resolveVariable(variable);
}
@@ -571,8 +603,7 @@ public final class ResolvableType implements Serializable {
}
if (parameterizedType.getOwnerType() != null) {
return forType(parameterizedType.getOwnerType(),
this.variableResolver).resolveVariable(variable);
return forType(parameterizedType.getOwnerType(), this.variableResolver).resolveVariable(variable);
}
}
@@ -627,7 +658,7 @@ public final class ResolvableType implements Serializable {
}
/**
* Custom serialization support for {@value #NONE}.
* Custom serialization support for {@link #NONE}.
*/
private Object readResolve() throws ObjectStreamException {
return (this.type == null ? NONE : this);
@@ -640,22 +671,7 @@ public final class ResolvableType implements Serializable {
if (this == NONE) {
return null;
}
return new VariableResolver() {
private static final long serialVersionUID = 1L;
@Override
public ResolvableType resolveVariable(TypeVariable<?> variable) {
return ResolvableType.this.resolveVariable(variable);
}
@Override
public Object getSource() {
return ResolvableType.this;
}
};
return new DefaultVariableResolver();
}
private static boolean variableResolverSourceEquals(VariableResolver o1, VariableResolver o2) {
@@ -842,8 +858,7 @@ public final class ResolvableType implements Serializable {
* @see #forMethodParameter(Method, int, Class)
* @see #forMethodParameter(MethodParameter)
*/
public static ResolvableType forMethodParameter(Method method, int parameterIndex,
Class<?> implementationClass) {
public static ResolvableType forMethodParameter(Method method, int parameterIndex, Class<?> implementationClass) {
Assert.notNull(method, "Method must not be null");
MethodParameter methodParameter = new MethodParameter(method, parameterIndex);
methodParameter.setContainingClass(implementationClass);
@@ -858,8 +873,7 @@ public final class ResolvableType implements Serializable {
*/
public static ResolvableType forMethodParameter(MethodParameter methodParameter) {
Assert.notNull(methodParameter, "MethodParameter must not be null");
ResolvableType owner = forType(methodParameter.getContainingClass()).as(
methodParameter.getDeclaringClass());
ResolvableType owner = forType(methodParameter.getContainingClass()).as(methodParameter.getDeclaringClass());
return forType(SerializableTypeWrapper.forMethodParameter(methodParameter),
owner.asVariableResolver()).getNested(methodParameter.getNestingLevel(),
methodParameter.typeIndexesPerLevel);
@@ -877,15 +891,13 @@ public final class ResolvableType implements Serializable {
}
/**
* Return a {@link ResolvableType} for the specified {@link Class} with pre-declared
* generics.
* Return a {@link ResolvableType} for the specified {@link Class} with pre-declared generics.
* @param sourceClass the source class
* @param generics the generics of the class
* @return a {@link ResolvableType} for the specific class and generics
* @see #forClassWithGenerics(Class, ResolvableType...)
*/
public static ResolvableType forClassWithGenerics(Class<?> sourceClass,
Class<?>... generics) {
public static ResolvableType forClassWithGenerics(Class<?> sourceClass, Class<?>... generics) {
Assert.notNull(sourceClass, "Source class must not be null");
Assert.notNull(generics, "Generics must not be null");
ResolvableType[] resolvableGenerics = new ResolvableType[generics.length];
@@ -896,44 +908,17 @@ public final class ResolvableType implements Serializable {
}
/**
* Return a {@link ResolvableType} for the specified {@link Class} with pre-declared
* generics.
* Return a {@link ResolvableType} for the specified {@link Class} with pre-declared generics.
* @param sourceClass the source class
* @param generics the generics of the class
* @return a {@link ResolvableType} for the specific class and generics
* @see #forClassWithGenerics(Class, Class...)
*/
public static ResolvableType forClassWithGenerics(Class<?> sourceClass,
final ResolvableType... generics) {
public static ResolvableType forClassWithGenerics(Class<?> sourceClass, ResolvableType... generics) {
Assert.notNull(sourceClass, "Source class must not be null");
Assert.notNull(generics, "Generics must not be null");
final TypeVariable<?>[] typeVariables = sourceClass.getTypeParameters();
Assert.isTrue(typeVariables.length == generics.length,
"Missmatched number of generics specified");
VariableResolver variableResolver = new VariableResolver() {
private static final long serialVersionUID = 1L;
@Override
public ResolvableType resolveVariable(TypeVariable<?> variable) {
for (int i = 0; i < typeVariables.length; i++) {
if(typeVariables[i].equals(variable)) {
return generics[i];
}
}
return null;
}
@Override
public Object getSource() {
return generics;
}
};
return forType(sourceClass, variableResolver);
TypeVariable<?>[] typeVariables = sourceClass.getTypeParameters();
return forType(sourceClass, new TypeVariablesVariableResolver(typeVariables, generics));
}
/**
@@ -948,9 +933,8 @@ public final class ResolvableType implements Serializable {
}
/**
* Return a {@link ResolvableType} for the specified {@link Type} backed by the
* given owner type. NOTE: The resulting {@link ResolvableType} may not be
* {@link Serializable}.
* Return a {@link ResolvableType} for the specified {@link Type} backed by the given
* owner type. NOTE: The resulting {@link ResolvableType} may not be {@link Serializable}.
* @param type the source type or {@code null}
* @param owner the owner type used to resolve variables
* @return a {@link ResolvableType} for the specified {@link Type} and owner
@@ -972,7 +956,7 @@ public final class ResolvableType implements Serializable {
* @return a {@link ResolvableType} for the specified {@link Type} and {@link VariableResolver}
*/
static ResolvableType forType(Type type, VariableResolver variableResolver) {
if(type == null) {
if (type == null) {
return NONE;
}
// Check the cache, we may have a ResolvableType that may have already been resolved
@@ -1002,7 +986,51 @@ public final class ResolvableType implements Serializable {
* @return the resolved variable or {@code null}
*/
ResolvableType resolveVariable(TypeVariable<?> variable);
}
@SuppressWarnings("serial")
private class DefaultVariableResolver implements VariableResolver {
@Override
public ResolvableType resolveVariable(TypeVariable<?> variable) {
return ResolvableType.this.resolveVariable(variable);
}
@Override
public Object getSource() {
return ResolvableType.this;
}
}
@SuppressWarnings("serial")
private static class TypeVariablesVariableResolver implements VariableResolver {
private final TypeVariable[] typeVariables;
private final ResolvableType[] generics;
public TypeVariablesVariableResolver(TypeVariable[] typeVariables, ResolvableType[] generics) {
Assert.isTrue(typeVariables.length == generics.length, "Mismatched number of generics specified");
this.typeVariables = typeVariables;
this.generics = generics;
}
@Override
public ResolvableType resolveVariable(TypeVariable<?> variable) {
for (int i = 0; i < this.typeVariables.length; i++) {
if (this.typeVariables[i].equals(variable)) {
return this.generics[i];
}
}
return null;
}
@Override
public Object getSource() {
return this.generics;
}
}
@@ -1016,12 +1044,12 @@ public final class ResolvableType implements Serializable {
private final ResolvableType[] bounds;
/**
* Private constructor to create a new {@link WildcardBounds} instance.
* Internal constructor to create a new {@link WildcardBounds} instance.
* @param kind the kind of bounds
* @param bounds the bounds
* @see #get(ResolvableType)
*/
private WildcardBounds(Kind kind, ResolvableType[] bounds) {
public WildcardBounds(Kind kind, ResolvableType[] bounds) {
this.kind = kind;
this.bounds = bounds;
}
@@ -1079,8 +1107,7 @@ public final class ResolvableType implements Serializable {
Type[] bounds = boundsType == Kind.UPPER ? wildcardType.getUpperBounds() : wildcardType.getLowerBounds();
ResolvableType[] resolvableBounds = new ResolvableType[bounds.length];
for (int i = 0; i < bounds.length; i++) {
resolvableBounds[i] = ResolvableType.forType(bounds[i],
type.variableResolver);
resolvableBounds[i] = ResolvableType.forType(bounds[i], type.variableResolver);
}
return new WildcardBounds(boundsType, resolvableBounds);
}
@@ -1089,7 +1116,6 @@ public final class ResolvableType implements Serializable {
* The various kinds of bounds.
*/
static enum Kind {UPPER, LOWER}
}
}