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Consistent use of empty array constants in ReflectionUtils 

Closes gh-22567
pull/26676/head
Juergen Hoeller 7 years ago
parent
a7adafdb6a
commit
62c923711d
1 changed files with 297 additions and 285 deletions
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  1. 582
      spring-core/src/main/java/org/springframework/util/ReflectionUtils.java

582
spring-core/src/main/java/org/springframework/util/ReflectionUtils.java
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@ -66,9 +66,9 @@ public abstract class ReflectionUtils { @@ -66,9 +66,9 @@ 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];
/**
@ -83,163 +83,7 @@ public abstract class ReflectionUtils { @@ -83,163 +83,7 @@ public abstract class ReflectionUtils {
private static final Map<Class<?>, Field[]> declaredFieldsCache = new ConcurrentReferenceHashMap<>(256);
/**
* 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());
}
}
/**
* Attempt to find a {@link Method} on the supplied class with the supplied name
* and no parameters. Searches all superclasses up to {@code Object}.
* <p>Returns {@code null} if no {@link Method} can be found.
* @param clazz the class to introspect
* @param name the name of the method
* @return the Method object, or {@code null} if none found
*/
@Nullable
public static Method findMethod(Class<?> clazz, String name) {
return findMethod(clazz, name, new Class<?>[0]);
}
/**
* Attempt to find a {@link Method} on the supplied class with the supplied name
* and parameter types. Searches all superclasses up to {@code Object}.
* <p>Returns {@code null} if no {@link Method} can be found.
* @param clazz the class to introspect
* @param name the name of the method
* @param paramTypes the parameter types of the method
* (may be {@code null} to indicate any signature)
* @return the Method object, or {@code null} if none found
*/
@Nullable
public static Method findMethod(Class<?> clazz, String name, @Nullable Class<?>... paramTypes) {
Assert.notNull(clazz, "Class must not be null");
Assert.notNull(name, "Method name must not be null");
Class<?> searchType = clazz;
while (searchType != null) {
Method[] methods = (searchType.isInterface() ? searchType.getMethods() : getDeclaredMethods(searchType));
for (Method method : methods) {
if (name.equals(method.getName()) &&
(paramTypes == null || Arrays.equals(paramTypes, method.getParameterTypes()))) {
return method;
}
}
searchType = searchType.getSuperclass();
}
return null;
}
/**
* Invoke the specified {@link Method} against the supplied target object with no arguments.
* The target object can be {@code null} when invoking a static {@link Method}.
* <p>Thrown exceptions are handled via a call to {@link #handleReflectionException}.
* @param method the method to invoke
* @param target the target object to invoke the method on
* @return the invocation result, if any
* @see #invokeMethod(java.lang.reflect.Method, Object, Object[])
*/
@Nullable
public static Object invokeMethod(Method method, @Nullable Object target) {
return invokeMethod(method, target, new Object[0]);
}
/**
* Invoke the specified {@link Method} against the supplied target object with the
* supplied arguments. The target object can be {@code null} when invoking a
* static {@link Method}.
* <p>Thrown exceptions are handled via a call to {@link #handleReflectionException}.
* @param method the method to invoke
* @param target the target object to invoke the method on
* @param args the invocation arguments (may be {@code null})
* @return the invocation result, if any
*/
@Nullable
public static Object invokeMethod(Method method, @Nullable Object target, @Nullable Object... args) {
try {
return method.invoke(target, args);
}
catch (Exception ex) {
handleReflectionException(ex);
}
throw new IllegalStateException("Should never get here");
}
// Exception handling
/**
* Handle the given reflection exception. Should only be called if no
@ -319,161 +163,138 @@ public abstract class ReflectionUtils { @@ -319,161 +163,138 @@ public abstract class ReflectionUtils {
throw new UndeclaredThrowableException(ex);
}
/**
* Determine whether the given method explicitly declares the given
* exception or one of its superclasses, which means that an exception
* of that type can be propagated as-is within a reflective invocation.
* @param method the declaring method
* @param exceptionType the exception to throw
* @return {@code true} if the exception can be thrown as-is;
* {@code false} if it needs to be wrapped
*/
public static boolean declaresException(Method method, Class<?> exceptionType) {
Assert.notNull(method, "Method must not be null");
Class<?>[] declaredExceptions = method.getExceptionTypes();
for (Class<?> declaredException : declaredExceptions) {
if (declaredException.isAssignableFrom(exceptionType)) {
return true;
}
}
return false;
}
// Constructor handling
/**
* Determine whether the given field is a "public static final" constant.
* @param field the field to check
* 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 boolean isPublicStaticFinal(Field field) {
int modifiers = field.getModifiers();
return (Modifier.isPublic(modifiers) && Modifier.isStatic(modifiers) && Modifier.isFinal(modifiers));
public static <T> Constructor<T> accessibleConstructor(Class<T> clazz, Class<?>... parameterTypes)
throws NoSuchMethodException {
Constructor<T> ctor = clazz.getDeclaredConstructor(parameterTypes);
makeAccessible(ctor);
return ctor;
}
/**
* Determine whether the given method is an "equals" method.
* @see java.lang.Object#equals(Object)
* 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
*/
public static boolean isEqualsMethod(@Nullable Method method) {
if (method == null || !method.getName().equals("equals")) {
return false;
@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);
}
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);
}
// Method handling
/**
* Determine whether the given method is originally declared by {@link java.lang.Object}.
* Attempt to find a {@link Method} on the supplied class with the supplied name
* and no parameters. Searches all superclasses up to {@code Object}.
* <p>Returns {@code null} if no {@link Method} can be found.
* @param clazz the class to introspect
* @param name the name of the method
* @return the Method object, or {@code null} if none found
*/
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;
}
@Nullable
public static Method findMethod(Class<?> clazz, String name) {
return findMethod(clazz, name, new Class<?>[0]);
}
/**
* Determine whether the given method is a CGLIB 'renamed' method,
* following the pattern "CGLIB$methodName$0".
* @param renamedMethod the method to check
* @see org.springframework.cglib.proxy.Enhancer#rename
* Attempt to find a {@link Method} on the supplied class with the supplied name
* and parameter types. Searches all superclasses up to {@code Object}.
* <p>Returns {@code null} if no {@link Method} can be found.
* @param clazz the class to introspect
* @param name the name of the method
* @param paramTypes the parameter types of the method
* (may be {@code null} to indicate any signature)
* @return the Method object, or {@code null} if none found
*/
public static boolean isCglibRenamedMethod(Method renamedMethod) {
String name = renamedMethod.getName();
if (name.startsWith(CGLIB_RENAMED_METHOD_PREFIX)) {
int i = name.length() - 1;
while (i >= 0 && Character.isDigit(name.charAt(i))) {
i--;
@Nullable
public static Method findMethod(Class<?> clazz, String name, @Nullable Class<?>... paramTypes) {
Assert.notNull(clazz, "Class must not be null");
Assert.notNull(name, "Method name must not be null");
Class<?> searchType = clazz;
while (searchType != null) {
Method[] methods = (searchType.isInterface() ? searchType.getMethods() : getDeclaredMethods(searchType));
for (Method method : methods) {
if (name.equals(method.getName()) &&
(paramTypes == null || Arrays.equals(paramTypes, method.getParameterTypes()))) {
return method;
}
}
return ((i > CGLIB_RENAMED_METHOD_PREFIX.length()) &&
(i < name.length() - 1) && name.charAt(i) == '$');
}
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);
searchType = searchType.getSuperclass();
}
return null;
}
/**
* 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
* Invoke the specified {@link Method} against the supplied target object with no arguments.
* The target object can be {@code null} when invoking a static {@link Method}.
* <p>Thrown exceptions are handled via a call to {@link #handleReflectionException}.
* @param method the method to invoke
* @param target the target object to invoke the method on
* @return the invocation result, if any
* @see #invokeMethod(java.lang.reflect.Method, Object, Object[])
*/
@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);
}
@Nullable
public static Object invokeMethod(Method method, @Nullable Object target) {
return invokeMethod(method, target, new Object[0]);
}
/**
* 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
* Invoke the specified {@link Method} against the supplied target object with the
* supplied arguments. The target object can be {@code null} when invoking a
* static {@link Method}.
* <p>Thrown exceptions are handled via a call to {@link #handleReflectionException}.
* @param method the method to invoke
* @param target the target object to invoke the method on
* @param args the invocation arguments (may be {@code null})
* @return the invocation result, if any
*/
@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);
@Nullable
public static Object invokeMethod(Method method, @Nullable Object target, @Nullable Object... args) {
try {
return method.invoke(target, args);
}
catch (Exception ex) {
handleReflectionException(ex);
}
throw new IllegalStateException("Should never get here");
}
/**
* 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
* Determine whether the given method explicitly declares the given
* exception or one of its superclasses, which means that an exception
* of that type can be propagated as-is within a reflective invocation.
* @param method the declaring method
* @param exceptionType the exception to throw
* @return {@code true} if the exception can be thrown as-is;
* {@code false} if it needs to be wrapped
*/
public static <T> Constructor<T> accessibleConstructor(Class<T> clazz, Class<?>... parameterTypes)
throws NoSuchMethodException {
Constructor<T> ctor = clazz.getDeclaredConstructor(parameterTypes);
makeAccessible(ctor);
return ctor;
public static boolean declaresException(Method method, Class<?> exceptionType) {
Assert.notNull(method, "Method must not be null");
Class<?>[] declaredExceptions = method.getExceptionTypes();
for (Class<?> declaredException : declaredExceptions) {
if (declaredException.isAssignableFrom(exceptionType)) {
return true;
}
}
return false;
}
/**
@ -555,7 +376,7 @@ public abstract class ReflectionUtils { @@ -555,7 +376,7 @@ 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);
}
/**
@ -604,7 +425,7 @@ public abstract class ReflectionUtils { @@ -604,7 +425,7 @@ public abstract class ReflectionUtils {
methods.add(method);
}
}, mf);
return methods.toArray(new Method[0]);
return methods.toArray(EMPTY_METHOD_ARRAY);
}
/**
@ -636,7 +457,7 @@ public abstract class ReflectionUtils { @@ -636,7 +457,7 @@ 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() +
@ -662,6 +483,168 @@ public abstract class ReflectionUtils { @@ -662,6 +483,168 @@ 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
@ -735,7 +718,7 @@ public abstract class ReflectionUtils { @@ -735,7 +718,7 @@ 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() +
@ -765,6 +748,35 @@ public abstract class ReflectionUtils { @@ -765,6 +748,35 @@ 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

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