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This commit is contained in:
Juergen Hoeller
2019-03-13 15:32:24 +01:00
parent 88049e9b5c
commit fe56aa6fa4
11 changed files with 341 additions and 321 deletions
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7
spring-core/src/main/java/org/springframework/lang/NonNull.java
View File

@@ -1,5 +1,5 @@
/*
* Copyright 2002-2018 the original author or authors.
* Copyright 2002-2019 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.
@@ -26,8 +26,9 @@ import javax.annotation.meta.TypeQualifierNickname;
/**
* A common Spring annotation to declare that annotated elements cannot be {@code null}.
* Leverages JSR 305 meta-annotations to indicate nullability in Java to common tools with
* JSR 305 support and used by Kotlin to infer nullability of Spring API.
*
* <p>Leverages JSR-305 meta-annotations to indicate nullability in Java to common
* tools with JSR-305 support and used by Kotlin to infer nullability of Spring API.
*
* <p>Should be used at parameter, return value, and field level. Method overrides should
* repeat parent {@code @NonNull} annotations unless they behave differently.

4
spring-core/src/main/java/org/springframework/lang/NonNullFields.java
View File

@@ -1,5 +1,5 @@
/*
* Copyright 2002-2017 the original author or authors.
* Copyright 2002-2019 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.
@@ -36,7 +36,7 @@ import javax.annotation.meta.TypeQualifierDefault;
*
* @author Sebastien Deleuze
* @since 5.0
* @see NonNullFields
* @see NonNullApi
* @see Nullable
* @see NonNull
*/

8
spring-core/src/main/java/org/springframework/lang/Nullable.java
View File

@@ -1,5 +1,5 @@
/*
* Copyright 2002-2018 the original author or authors.
* Copyright 2002-2019 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.
@@ -27,8 +27,10 @@ import javax.annotation.meta.When;
/**
* A common Spring annotation to declare that annotated elements can be {@code null} under
* some circumstance. Leverages JSR 305 meta-annotations to indicate nullability in Java
* to common tools with JSR 305 support and used by Kotlin to infer nullability of Spring API.
* some circumstance.
*
* <p>Leverages JSR-305 meta-annotations to indicate nullability in Java to common
* tools with JSR-305 support and used by Kotlin to infer nullability of Spring API.
*
* <p>Should be used at parameter, return value, and field level. Methods override should
* repeat parent {@code @Nullable} annotations unless they behave differently.

584
spring-core/src/main/java/org/springframework/util/ReflectionUtils.java
View File

@@ -1,5 +1,5 @@
/*
* Copyright 2002-2018 the original author or authors.
* Copyright 2002-2019 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.
@@ -61,13 +61,13 @@ public abstract class ReflectionUtils {
* @since 3.0.5
*/
public static final MethodFilter USER_DECLARED_METHODS =
(method -> (!method.isBridge() && !method.isSynthetic() && method.getDeclaringClass() != Object.class));
(method -> !method.isBridge() && !method.isSynthetic() && method.getDeclaringClass() != Object.class);
/**
* Pre-built FieldFilter that matches all non-static, non-final fields.
*/
public static final FieldFilter COPYABLE_FIELDS =
field -> !(Modifier.isStatic(field.getModifiers()) || Modifier.isFinal(field.getModifiers()));
(field -> !(Modifier.isStatic(field.getModifiers()) || Modifier.isFinal(field.getModifiers())));
/**
@@ -76,9 +76,9 @@ public abstract class ReflectionUtils {
*/
private static final String CGLIB_RENAMED_METHOD_PREFIX = "CGLIB$";
private static final Method[] NO_METHODS = {};
private static final Method[] EMPTY_METHOD_ARRAY = new Method[0];
private static final Field[] NO_FIELDS = {};
private static final Field[] EMPTY_FIELD_ARRAY = new Field[0];
/**
@@ -93,88 +93,124 @@ public abstract class ReflectionUtils {
private static final Map<Class<?>, Field[]> declaredFieldsCache = new ConcurrentReferenceHashMap<>(256);
// Exception handling
/**
* Attempt to find a {@link Field field} on the supplied {@link Class} with the
* supplied {@code name}. Searches all superclasses up to {@link Object}.
* @param clazz the class to introspect
* @param name the name of the field
* @return the corresponding Field object, or {@code null} if not found
* Handle the given reflection exception. Should only be called if no
* checked exception is expected to be thrown by the target method.
* <p>Throws the underlying RuntimeException or Error in case of an
* InvocationTargetException with such a root cause. Throws an
* IllegalStateException with an appropriate message or
* UndeclaredThrowableException otherwise.
* @param ex the reflection exception to handle
*/
@Nullable
public static Field findField(Class<?> clazz, String name) {
return findField(clazz, name, null);
public static void handleReflectionException(Exception ex) {
if (ex instanceof NoSuchMethodException) {
throw new IllegalStateException("Method not found: " + ex.getMessage());
}
if (ex instanceof IllegalAccessException) {
throw new IllegalStateException("Could not access method: " + ex.getMessage());
}
if (ex instanceof InvocationTargetException) {
handleInvocationTargetException((InvocationTargetException) ex);
}
if (ex instanceof RuntimeException) {
throw (RuntimeException) ex;
}
throw new UndeclaredThrowableException(ex);
}
/**
* Attempt to find a {@link Field field} on the supplied {@link Class} with the
* supplied {@code name} and/or {@link Class type}. Searches all superclasses
* up to {@link Object}.
* @param clazz the class to introspect
* @param name the name of the field (may be {@code null} if type is specified)
* @param type the type of the field (may be {@code null} if name is specified)
* @return the corresponding Field object, or {@code null} if not found
* Handle the given invocation target exception. Should only be called if no
* checked exception is expected to be thrown by the target method.
* <p>Throws the underlying RuntimeException or Error in case of such a root
* cause. Throws an UndeclaredThrowableException otherwise.
* @param ex the invocation target exception to handle
*/
@Nullable
public static Field findField(Class<?> clazz, @Nullable String name, @Nullable Class<?> type) {
Assert.notNull(clazz, "Class must not be null");
Assert.isTrue(name != null || type != null, "Either name or type of the field must be specified");
Class<?> searchType = clazz;
while (Object.class != searchType && searchType != null) {
Field[] fields = getDeclaredFields(searchType);
for (Field field : fields) {
if ((name == null || name.equals(field.getName())) &&
(type == null || type.equals(field.getType()))) {
return field;
}
}
searchType = searchType.getSuperclass();
}
return null;
public static void handleInvocationTargetException(InvocationTargetException ex) {
rethrowRuntimeException(ex.getTargetException());
}
/**
* Set the field represented by the supplied {@link Field field object} on the
* specified {@link Object target object} to the specified {@code value}.
* In accordance with {@link Field#set(Object, Object)} semantics, the new value
* is automatically unwrapped if the underlying field has a primitive type.
* <p>Thrown exceptions are handled via a call to {@link #handleReflectionException(Exception)}.
* @param field the field to set
* @param target the target object on which to set the field
* @param value the value to set (may be {@code null})
* Rethrow the given {@link Throwable exception}, which is presumably the
* <em>target exception</em> of an {@link InvocationTargetException}.
* Should only be called if no checked exception is expected to be thrown
* by the target method.
* <p>Rethrows the underlying exception cast to a {@link RuntimeException} or
* {@link Error} if appropriate; otherwise, throws an
* {@link UndeclaredThrowableException}.
* @param ex the exception to rethrow
* @throws RuntimeException the rethrown exception
*/
public static void setField(Field field, @Nullable Object target, @Nullable Object value) {
try {
field.set(target, value);
public static void rethrowRuntimeException(Throwable ex) {
if (ex instanceof RuntimeException) {
throw (RuntimeException) ex;
}
catch (IllegalAccessException ex) {
handleReflectionException(ex);
throw new IllegalStateException(
"Unexpected reflection exception - " + ex.getClass().getName() + ": " + ex.getMessage());
if (ex instanceof Error) {
throw (Error) ex;
}
throw new UndeclaredThrowableException(ex);
}
/**
* Get the field represented by the supplied {@link Field field object} on the
* specified {@link Object target object}. In accordance with {@link Field#get(Object)}
* semantics, the returned value is automatically wrapped if the underlying field
* has a primitive type.
* <p>Thrown exceptions are handled via a call to {@link #handleReflectionException(Exception)}.
* @param field the field to get
* @param target the target object from which to get the field
* @return the field's current value
* Rethrow the given {@link Throwable exception}, which is presumably the
* <em>target exception</em> of an {@link InvocationTargetException}.
* Should only be called if no checked exception is expected to be thrown
* by the target method.
* <p>Rethrows the underlying exception cast to an {@link Exception} or
* {@link Error} if appropriate; otherwise, throws an
* {@link UndeclaredThrowableException}.
* @param ex the exception to rethrow
* @throws Exception the rethrown exception (in case of a checked exception)
*/
@Nullable
public static Object getField(Field field, @Nullable Object target) {
try {
return field.get(target);
public static void rethrowException(Throwable ex) throws Exception {
if (ex instanceof Exception) {
throw (Exception) ex;
}
catch (IllegalAccessException ex) {
handleReflectionException(ex);
throw new IllegalStateException(
"Unexpected reflection exception - " + ex.getClass().getName() + ": " + ex.getMessage());
if (ex instanceof Error) {
throw (Error) ex;
}
throw new UndeclaredThrowableException(ex);
}
// Constructor handling
/**
* Obtain an accessible constructor for the given class and parameters.
* @param clazz the clazz to check
* @param parameterTypes the parameter types of the desired constructor
* @return the constructor reference
* @throws NoSuchMethodException if no such constructor exists
* @since 5.0
*/
public static <T> Constructor<T> accessibleConstructor(Class<T> clazz, Class<?>... parameterTypes)
throws NoSuchMethodException {
Constructor<T> ctor = clazz.getDeclaredConstructor(parameterTypes);
makeAccessible(ctor);
return ctor;
}
/**
* Make the given constructor accessible, explicitly setting it accessible
* if necessary. The {@code setAccessible(true)} method is only called
* when actually necessary, to avoid unnecessary conflicts with a JVM
* SecurityManager (if active).
* @param ctor the constructor to make accessible
* @see java.lang.reflect.Constructor#setAccessible
*/
@SuppressWarnings("deprecation") // on JDK 9
public static void makeAccessible(Constructor<?> ctor) {
if ((!Modifier.isPublic(ctor.getModifiers()) ||
!Modifier.isPublic(ctor.getDeclaringClass().getModifiers())) && !ctor.isAccessible()) {
ctor.setAccessible(true);
}
}
// Method handling
/**
* Attempt to find a {@link Method} on the supplied class with the supplied name
* and no parameters. Searches all superclasses up to {@code Object}.
@@ -297,84 +333,6 @@ public abstract class ReflectionUtils {
throw new IllegalStateException("Should never get here");
}
/**
* Handle the given reflection exception. Should only be called if no
* checked exception is expected to be thrown by the target method.
* <p>Throws the underlying RuntimeException or Error in case of an
* InvocationTargetException with such a root cause. Throws an
* IllegalStateException with an appropriate message or
* UndeclaredThrowableException otherwise.
* @param ex the reflection exception to handle
*/
public static void handleReflectionException(Exception ex) {
if (ex instanceof NoSuchMethodException) {
throw new IllegalStateException("Method not found: " + ex.getMessage());
}
if (ex instanceof IllegalAccessException) {
throw new IllegalStateException("Could not access method: " + ex.getMessage());
}
if (ex instanceof InvocationTargetException) {
handleInvocationTargetException((InvocationTargetException) ex);
}
if (ex instanceof RuntimeException) {
throw (RuntimeException) ex;
}
throw new UndeclaredThrowableException(ex);
}
/**
* Handle the given invocation target exception. Should only be called if no
* checked exception is expected to be thrown by the target method.
* <p>Throws the underlying RuntimeException or Error in case of such a root
* cause. Throws an UndeclaredThrowableException otherwise.
* @param ex the invocation target exception to handle
*/
public static void handleInvocationTargetException(InvocationTargetException ex) {
rethrowRuntimeException(ex.getTargetException());
}
/**
* Rethrow the given {@link Throwable exception}, which is presumably the
* <em>target exception</em> of an {@link InvocationTargetException}.
* Should only be called if no checked exception is expected to be thrown
* by the target method.
* <p>Rethrows the underlying exception cast to a {@link RuntimeException} or
* {@link Error} if appropriate; otherwise, throws an
* {@link UndeclaredThrowableException}.
* @param ex the exception to rethrow
* @throws RuntimeException the rethrown exception
*/
public static void rethrowRuntimeException(Throwable ex) {
if (ex instanceof RuntimeException) {
throw (RuntimeException) ex;
}
if (ex instanceof Error) {
throw (Error) ex;
}
throw new UndeclaredThrowableException(ex);
}
/**
* Rethrow the given {@link Throwable exception}, which is presumably the
* <em>target exception</em> of an {@link InvocationTargetException}.
* Should only be called if no checked exception is expected to be thrown
* by the target method.
* <p>Rethrows the underlying exception cast to an {@link Exception} or
* {@link Error} if appropriate; otherwise, throws an
* {@link UndeclaredThrowableException}.
* @param ex the exception to rethrow
* @throws Exception the rethrown exception (in case of a checked exception)
*/
public static void rethrowException(Throwable ex) throws Exception {
if (ex instanceof Exception) {
throw (Exception) ex;
}
if (ex instanceof Error) {
throw (Error) ex;
}
throw new UndeclaredThrowableException(ex);
}
/**
* Determine whether the given method explicitly declares the given
* exception or one of its superclasses, which means that an exception
@@ -395,143 +353,6 @@ public abstract class ReflectionUtils {
return false;
}
/**
* Determine whether the given field is a "public static final" constant.
* @param field the field to check
*/
public static boolean isPublicStaticFinal(Field field) {
int modifiers = field.getModifiers();
return (Modifier.isPublic(modifiers) && Modifier.isStatic(modifiers) && Modifier.isFinal(modifiers));
}
/**
* Determine whether the given method is an "equals" method.
* @see java.lang.Object#equals(Object)
*/
public static boolean isEqualsMethod(@Nullable Method method) {
if (method == null || !method.getName().equals("equals")) {
return false;
}
Class<?>[] paramTypes = method.getParameterTypes();
return (paramTypes.length == 1 && paramTypes[0] == Object.class);
}
/**
* Determine whether the given method is a "hashCode" method.
* @see java.lang.Object#hashCode()
*/
public static boolean isHashCodeMethod(@Nullable Method method) {
return (method != null && method.getName().equals("hashCode") && method.getParameterCount() == 0);
}
/**
* Determine whether the given method is a "toString" method.
* @see java.lang.Object#toString()
*/
public static boolean isToStringMethod(@Nullable Method method) {
return (method != null && method.getName().equals("toString") && method.getParameterCount() == 0);
}
/**
* Determine whether the given method is originally declared by {@link java.lang.Object}.
*/
public static boolean isObjectMethod(@Nullable Method method) {
if (method == null) {
return false;
}
try {
Object.class.getDeclaredMethod(method.getName(), method.getParameterTypes());
return true;
}
catch (Exception ex) {
return false;
}
}
/**
* Determine whether the given method is a CGLIB 'renamed' method,
* following the pattern "CGLIB$methodName$0".
* @param renamedMethod the method to check
* @see org.springframework.cglib.proxy.Enhancer#rename
*/
public static boolean isCglibRenamedMethod(Method renamedMethod) {
String name = renamedMethod.getName();
if (name.startsWith(CGLIB_RENAMED_METHOD_PREFIX)) {
int i = name.length() - 1;
while (i >= 0 && Character.isDigit(name.charAt(i))) {
i--;
}
return ((i > CGLIB_RENAMED_METHOD_PREFIX.length()) &&
(i < name.length() - 1) && name.charAt(i) == '$');
}
return false;
}
/**
* Make the given field accessible, explicitly setting it accessible if
* necessary. The {@code setAccessible(true)} method is only called
* when actually necessary, to avoid unnecessary conflicts with a JVM
* SecurityManager (if active).
* @param field the field to make accessible
* @see java.lang.reflect.Field#setAccessible
*/
@SuppressWarnings("deprecation") // on JDK 9
public static void makeAccessible(Field field) {
if ((!Modifier.isPublic(field.getModifiers()) ||
!Modifier.isPublic(field.getDeclaringClass().getModifiers()) ||
Modifier.isFinal(field.getModifiers())) && !field.isAccessible()) {
field.setAccessible(true);
}
}
/**
* Make the given method accessible, explicitly setting it accessible if
* necessary. The {@code setAccessible(true)} method is only called
* when actually necessary, to avoid unnecessary conflicts with a JVM
* SecurityManager (if active).
* @param method the method to make accessible
* @see java.lang.reflect.Method#setAccessible
*/
@SuppressWarnings("deprecation") // on JDK 9
public static void makeAccessible(Method method) {
if ((!Modifier.isPublic(method.getModifiers()) ||
!Modifier.isPublic(method.getDeclaringClass().getModifiers())) && !method.isAccessible()) {
method.setAccessible(true);
}
}
/**
* Make the given constructor accessible, explicitly setting it accessible
* if necessary. The {@code setAccessible(true)} method is only called
* when actually necessary, to avoid unnecessary conflicts with a JVM
* SecurityManager (if active).
* @param ctor the constructor to make accessible
* @see java.lang.reflect.Constructor#setAccessible
*/
@SuppressWarnings("deprecation") // on JDK 9
public static void makeAccessible(Constructor<?> ctor) {
if ((!Modifier.isPublic(ctor.getModifiers()) ||
!Modifier.isPublic(ctor.getDeclaringClass().getModifiers())) && !ctor.isAccessible()) {
ctor.setAccessible(true);
}
}
/**
* Obtain an accessible constructor for the given class and parameters.
* @param clazz the clazz to check
* @param parameterTypes the parameter types of the desired constructor
* @return the constructor reference
* @throws NoSuchMethodException if no such constructor exists
* @since 5.0
*/
public static <T> Constructor<T> accessibleConstructor(Class<T> clazz, Class<?>... parameterTypes)
throws NoSuchMethodException {
Constructor<T> ctor = clazz.getDeclaredConstructor(parameterTypes);
makeAccessible(ctor);
return ctor;
}
/**
* Perform the given callback operation on all matching methods of the given
* class, as locally declared or equivalent thereof (such as default methods
@@ -611,7 +432,7 @@ public abstract class ReflectionUtils {
public static Method[] getAllDeclaredMethods(Class<?> leafClass) {
final List<Method> methods = new ArrayList<>(32);
doWithMethods(leafClass, methods::add);
return methods.toArray(new Method[0]);
return methods.toArray(EMPTY_METHOD_ARRAY);
}
/**
@@ -647,7 +468,7 @@ public abstract class ReflectionUtils {
methods.add(method);
}
});
return methods.toArray(new Method[0]);
return methods.toArray(EMPTY_METHOD_ARRAY);
}
/**
@@ -679,7 +500,7 @@ public abstract class ReflectionUtils {
else {
result = declaredMethods;
}
declaredMethodsCache.put(clazz, (result.length == 0 ? NO_METHODS : result));
declaredMethodsCache.put(clazz, (result.length == 0 ? EMPTY_METHOD_ARRAY : result));
}
catch (Throwable ex) {
throw new IllegalStateException("Failed to introspect Class [" + clazz.getName() +
@@ -705,6 +526,168 @@ public abstract class ReflectionUtils {
return result;
}
/**
* Determine whether the given method is an "equals" method.
* @see java.lang.Object#equals(Object)
*/
public static boolean isEqualsMethod(@Nullable Method method) {
if (method == null || !method.getName().equals("equals")) {
return false;
}
Class<?>[] paramTypes = method.getParameterTypes();
return (paramTypes.length == 1 && paramTypes[0] == Object.class);
}
/**
* Determine whether the given method is a "hashCode" method.
* @see java.lang.Object#hashCode()
*/
public static boolean isHashCodeMethod(@Nullable Method method) {
return (method != null && method.getName().equals("hashCode") && method.getParameterCount() == 0);
}
/**
* Determine whether the given method is a "toString" method.
* @see java.lang.Object#toString()
*/
public static boolean isToStringMethod(@Nullable Method method) {
return (method != null && method.getName().equals("toString") && method.getParameterCount() == 0);
}
/**
* Determine whether the given method is originally declared by {@link java.lang.Object}.
*/
public static boolean isObjectMethod(@Nullable Method method) {
if (method == null) {
return false;
}
try {
Object.class.getDeclaredMethod(method.getName(), method.getParameterTypes());
return true;
}
catch (Exception ex) {
return false;
}
}
/**
* Determine whether the given method is a CGLIB 'renamed' method,
* following the pattern "CGLIB$methodName$0".
* @param renamedMethod the method to check
*/
public static boolean isCglibRenamedMethod(Method renamedMethod) {
String name = renamedMethod.getName();
if (name.startsWith(CGLIB_RENAMED_METHOD_PREFIX)) {
int i = name.length() - 1;
while (i >= 0 && Character.isDigit(name.charAt(i))) {
i--;
}
return (i > CGLIB_RENAMED_METHOD_PREFIX.length() && (i < name.length() - 1) && name.charAt(i) == '$');
}
return false;
}
/**
* Make the given method accessible, explicitly setting it accessible if
* necessary. The {@code setAccessible(true)} method is only called
* when actually necessary, to avoid unnecessary conflicts with a JVM
* SecurityManager (if active).
* @param method the method to make accessible
* @see java.lang.reflect.Method#setAccessible
*/
@SuppressWarnings("deprecation") // on JDK 9
public static void makeAccessible(Method method) {
if ((!Modifier.isPublic(method.getModifiers()) ||
!Modifier.isPublic(method.getDeclaringClass().getModifiers())) && !method.isAccessible()) {
method.setAccessible(true);
}
}
// Field handling
/**
* Attempt to find a {@link Field field} on the supplied {@link Class} with the
* supplied {@code name}. Searches all superclasses up to {@link Object}.
* @param clazz the class to introspect
* @param name the name of the field
* @return the corresponding Field object, or {@code null} if not found
*/
@Nullable
public static Field findField(Class<?> clazz, String name) {
return findField(clazz, name, null);
}
/**
* Attempt to find a {@link Field field} on the supplied {@link Class} with the
* supplied {@code name} and/or {@link Class type}. Searches all superclasses
* up to {@link Object}.
* @param clazz the class to introspect
* @param name the name of the field (may be {@code null} if type is specified)
* @param type the type of the field (may be {@code null} if name is specified)
* @return the corresponding Field object, or {@code null} if not found
*/
@Nullable
public static Field findField(Class<?> clazz, @Nullable String name, @Nullable Class<?> type) {
Assert.notNull(clazz, "Class must not be null");
Assert.isTrue(name != null || type != null, "Either name or type of the field must be specified");
Class<?> searchType = clazz;
while (Object.class != searchType && searchType != null) {
Field[] fields = getDeclaredFields(searchType);
for (Field field : fields) {
if ((name == null || name.equals(field.getName())) &&
(type == null || type.equals(field.getType()))) {
return field;
}
}
searchType = searchType.getSuperclass();
}
return null;
}
/**
* Set the field represented by the supplied {@link Field field object} on the
* specified {@link Object target object} to the specified {@code value}.
* In accordance with {@link Field#set(Object, Object)} semantics, the new value
* is automatically unwrapped if the underlying field has a primitive type.
* <p>Thrown exceptions are handled via a call to {@link #handleReflectionException(Exception)}.
* @param field the field to set
* @param target the target object on which to set the field
* @param value the value to set (may be {@code null})
*/
public static void setField(Field field, @Nullable Object target, @Nullable Object value) {
try {
field.set(target, value);
}
catch (IllegalAccessException ex) {
handleReflectionException(ex);
throw new IllegalStateException(
"Unexpected reflection exception - " + ex.getClass().getName() + ": " + ex.getMessage());
}
}
/**
* Get the field represented by the supplied {@link Field field object} on the
* specified {@link Object target object}. In accordance with {@link Field#get(Object)}
* semantics, the returned value is automatically wrapped if the underlying field
* has a primitive type.
* <p>Thrown exceptions are handled via a call to {@link #handleReflectionException(Exception)}.
* @param field the field to get
* @param target the target object from which to get the field
* @return the field's current value
*/
@Nullable
public static Object getField(Field field, @Nullable Object target) {
try {
return field.get(target);
}
catch (IllegalAccessException ex) {
handleReflectionException(ex);
throw new IllegalStateException(
"Unexpected reflection exception - " + ex.getClass().getName() + ": " + ex.getMessage());
}
}
/**
* Invoke the given callback on all locally declared fields in the given class.
* @param clazz the target class to analyze
@@ -778,7 +761,7 @@ public abstract class ReflectionUtils {
if (result == null) {
try {
result = clazz.getDeclaredFields();
declaredFieldsCache.put(clazz, (result.length == 0 ? NO_FIELDS : result));
declaredFieldsCache.put(clazz, (result.length == 0 ? EMPTY_FIELD_ARRAY : result));
}
catch (Throwable ex) {
throw new IllegalStateException("Failed to introspect Class [" + clazz.getName() +
@@ -808,6 +791,35 @@ public abstract class ReflectionUtils {
}, COPYABLE_FIELDS);
}
/**
* Determine whether the given field is a "public static final" constant.
* @param field the field to check
*/
public static boolean isPublicStaticFinal(Field field) {
int modifiers = field.getModifiers();
return (Modifier.isPublic(modifiers) && Modifier.isStatic(modifiers) && Modifier.isFinal(modifiers));
}
/**
* Make the given field accessible, explicitly setting it accessible if
* necessary. The {@code setAccessible(true)} method is only called
* when actually necessary, to avoid unnecessary conflicts with a JVM
* SecurityManager (if active).
* @param field the field to make accessible
* @see java.lang.reflect.Field#setAccessible
*/
@SuppressWarnings("deprecation") // on JDK 9
public static void makeAccessible(Field field) {
if ((!Modifier.isPublic(field.getModifiers()) ||
!Modifier.isPublic(field.getDeclaringClass().getModifiers()) ||
Modifier.isFinal(field.getModifiers())) && !field.isAccessible()) {
field.setAccessible(true);
}
}
// Cache handling
/**
* Clear the internal method/field cache.
* @since 4.2.4