Package org.infinispan.cdi.common.util

Class Reflections

java.lang.Object
org.infinispan.cdi.common.util.Reflections
public class Reflections extends Object
Utility class for working with JDK Reflection and also CDI's Annotated metadata.
Author:
Stuart Douglas, Pete Muir

  • Field Details

    • EMPTY_ANNOTATION_ARRAY

      public static final Annotation[] EMPTY_ANNOTATION_ARRAY
      An empty array of type Annotation, useful converting lists to arrays.

    • EMPTY_OBJECT_ARRAY

      public static final Object[] EMPTY_OBJECT_ARRAY
      An empty array of type Object, useful for converting lists to arrays.

    • EMPTY_TYPES

      public static final Type[] EMPTY_TYPES

    • EMPTY_CLASSES

      public static final Class<?>[] EMPTY_CLASSES

  • Method Details

    • cast

      public static <T> T cast(Object obj)

      Perform a runtime cast. Similar to Class.cast(Object), but useful when you do not have a Class object for type you wish to cast to.

      Class.cast(Object) should be used if possible

      Type Parameters:
      T - the type to cast to
      Parameters:
      obj - the object to perform the cast on
      Returns:
      the casted object
      Throws:
      ClassCastException - if the type T is not a subtype of the object
      See Also:

    • getAllDeclaredMethods

      public static Set<Method> getAllDeclaredMethods(Class<?> clazz)
      Get all the declared methods on the class hierarchy. This will return overridden methods.
      Parameters:
      clazz - The class to search
      Returns:
      the set of all declared methods or an empty set if there are none

    • setAccessible

      public static <A extends AccessibleObject> A setAccessible(A member)
      Set the accessibility flag on the AccessibleObject as described in AccessibleObject.setAccessible(boolean) within the context of a PrivilegedAction.
      Type Parameters:
      A - member the accessible object type
      Parameters:
      member - the accessible object
      Returns:
      the accessible object after the accessible flag has been altered

    • invokeMethod

      public static Object invokeMethod(boolean setAccessible, Method method, Object instance, Object... args)

      Invoke the specified method on the provided instance, passing any additional arguments included in this method as arguments to the specified method.

      This method attempts to set the accessible flag of the method in a PrivilegedAction before invoking the method if the first argument is true.

      This method provides the same functionality and throws the same exceptions as invokeMethod(boolean, Method, Class, Object, Object...), with the expected return type set to Object.

      See Also:

    • invokeMethod

      public static <T> T invokeMethod(Method method, Class<T> expectedReturnType, Object instance, Object... args)

      Invoke the specified method on the provided instance, passing any additional arguments included in this method as arguments to the specified method.

      This method provides the same functionality and throws the same exceptions as invokeMethod(boolean, Method, Class, Object, Object...), with the expected return type set to Object and honoring the accessibility of the method.

      See Also:

    • invokeMethod

      public static <T> T invokeMethod(boolean setAccessible, Method method, Class<T> expectedReturnType, Object instance, Object... args)

      Invoke the method on the instance, with any arguments specified, casting the result of invoking the method to the expected return type.

      This method wraps Method.invoke(Object, Object...), converting the checked exceptions that Method.invoke(Object, Object...) specifies to runtime exceptions.

      If instructed, this method attempts to set the accessible flag of the method in a PrivilegedAction before invoking the method.

      Parameters:
      setAccessible - flag indicating whether method should first be set as accessible
      method - the method to invoke
      instance - the instance to invoke the method
      args - the arguments to the method
      Returns:
      the result of invoking the method, or null if the method's return type is void
      Throws:
      RuntimeException - if this Method object enforces Java language access control and the underlying method is inaccessible or if the underlying method throws an exception or if the initialization provoked by this method fails.
      IllegalArgumentException - if the method is an instance method and the specified instance argument is not an instance of the class or interface declaring the underlying method (or of a subclass or implementor thereof); if the number of actual and formal parameters differ; if an unwrapping conversion for primitive arguments fails; or if, after possible unwrapping, a parameter value cannot be converted to the corresponding formal parameter type by a method invocation conversion.
      NullPointerException - if the specified instance is null and the method is an instance method.
      ClassCastException - if the result of invoking the method cannot be cast to the expectedReturnType
      ExceptionInInitializerError - if the initialization provoked by this method fails.
      See Also:

    • getFieldValue

      public static <T> T getFieldValue(Field field, Object instance, Class<T> expectedType)

      Get the value of the field, on the specified instance, casting the value of the field to the expected type.

      This method wraps Field.get(Object), converting the checked exceptions that Field.get(Object) specifies to runtime exceptions.

      Type Parameters:
      T - the type of the field's value
      Parameters:
      field - the field to operate on
      instance - the instance from which to retrieve the value
      expectedType - the expected type of the field's value
      Returns:
      the value of the field
      Throws:
      RuntimeException - if the underlying field is inaccessible.
      IllegalArgumentException - if the specified instance is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof).
      NullPointerException - if the specified instance is null and the field is an instance field.
      ExceptionInInitializerError - if the initialization provoked by this method fails.

    • getRawType

      public static <T> Class<T> getRawType(Type type)
      Extract the raw type, given a type.
      Type Parameters:
      T - the type
      Parameters:
      type - the type to extract the raw type from
      Returns:
      the raw type, or null if the raw type cannot be determined.

    • isSerializable

      public static boolean isSerializable(Class<?> clazz)
      Check if a class is serializable.
      Parameters:
      clazz - The class to check
      Returns:
      true if the class implements serializable or is a primitive

    • isAssignableFrom

      public static boolean isAssignableFrom(Class<?> rawType1, Type[] actualTypeArguments1, Class<?> rawType2, Type[] actualTypeArguments2)
      Check the assignability of one type to another, taking into account the actual type arguements
      Parameters:
      rawType1 - the raw type of the class to check
      actualTypeArguments1 - the actual type arguements to check, or an empty array if not a parameterized type
      rawType2 - the raw type of the class to check
      actualTypeArguments2 - the actual type arguements to check, or an empty array if not a parameterized type
      Returns:

    • matches

      public static boolean matches(Class<?> rawType1, Type[] actualTypeArguments1, Class<?> rawType2, Type[] actualTypeArguments2)

    • isAssignableFrom

      public static boolean isAssignableFrom(Type[] actualTypeArguments1, Type[] actualTypeArguments2)

    • matches

      public static boolean matches(Type type1, Set<? extends Type> types2)

    • isAssignableFrom

      public static boolean isAssignableFrom(Type type1, Type[] types2)

    • isAssignableFrom

      public static boolean isAssignableFrom(Type type1, Type type2)

    • matches

      public static boolean matches(Type type1, Type type2)

    • isTypeBounded

      public static boolean isTypeBounded(Type type, Type[] lowerBounds, Type[] upperBounds)

    • isAssignableFrom

      public static boolean isAssignableFrom(Class<?> rawType1, Type[] actualTypeArguments1, Type type2)

    • matches

      public static boolean matches(Class<?> rawType1, Type[] actualTypeArguments1, Type type2)

    • matches

      public static boolean matches(Set<Type> types1, Set<Type> types2)
      Check whether whether any of the types1 matches a type in types2
      Parameters:
      types1 -
      types2 -
      Returns:

    • isAssignableFrom

      public static boolean isAssignableFrom(Type[] types1, Type type2)

    • getMetaAnnotation

      public static <A extends Annotation> A getMetaAnnotation(javax.enterprise.inject.spi.Annotated element, Class<A> annotationType)
      Inspects an annotated element for the given meta annotation. This should only be used for user defined meta annotations, where the annotation must be physically present.
      Parameters:
      element - The element to inspect
      annotationType - The meta annotation to search for
      Returns:
      The annotation instance found on this element or null if no matching annotation was found.

    • getQualifiers

      public static Set<Annotation> getQualifiers(javax.enterprise.inject.spi.BeanManager beanManager, Iterable<Annotation> annotations)
      Extract the qualifiers from a set of annotations.
      Parameters:
      beanManager - the beanManager to use to determine if an annotation is a qualifier
      annotations - the annotations to check
      Returns:
      any qualifiers present in annotations

    • getQualifiers

      public static Set<Annotation> getQualifiers(javax.enterprise.inject.spi.BeanManager beanManager, Iterable<Annotation>... annotations)
      Extract the qualifiers from a set of annotations.
      Parameters:
      beanManager - the beanManager to use to determine if an annotation is a qualifier
      annotations - the annotations to check
      Returns:
      any qualifiers present in annotations

    • getAllDeclaredFields

      public static Set<Field> getAllDeclaredFields(Class<?> clazz)
      Get all the declared fields on the class hierarchy. This will return overridden fields.
      Parameters:
      clazz - The class to search
      Returns:
      the set of all declared fields or an empty set if there are none