Package migratedb.v1.core.internal.util

Class ClassUtils

java.lang.Object
migratedb.v1.core.internal.util.ClassUtils
public final class ClassUtils extends Object

  • Constructor Details

    • ClassUtils

      public ClassUtils()

  • Method Details

    • instantiate

      public static <T> T instantiate(String className, @Nullable ClassLoader classLoader)
      Creates a new instance of a class.
      Type Parameters:
      T - The type of the new instance.
      Parameters:
      className - The fully qualified name of the class to instantiate.
      classLoader - The ClassLoader to use.
      Returns:
      The new instance.
      Throws:
      MigrateDbException - Thrown when the instantiation failed.

    • instantiate

      public static <T> T instantiate(Class<T> clazz)
      Creates a new instance of clazz.
      Type Parameters:
      T - The type of the new instance.
      Returns:
      The new instance.
      Throws:
      MigrateDbException - Thrown when the instantiation failed.

    • instantiateAll

      public static <T> List<T> instantiateAll(Collection<String> classes, ClassLoader classLoader)
      Instantiate all these classes.
      Type Parameters:
      T - The common type for all classes.
      Parameters:
      classes - Fully qualified class names to instantiate.
      classLoader - The ClassLoader to use.
      Returns:
      The list of instances.

    • isPresent

      public static boolean isPresent(String className, ClassLoader classLoader)
      Determine whether the Class identified by the supplied name is present and can be loaded. Will return false if either the class or one of its dependencies is not present or cannot be loaded.
      Parameters:
      className - The name of the class to check.
      classLoader - The ClassLoader to use.
      Returns:
      whether the specified class is present

    • isImplementationPresent

      public static boolean isImplementationPresent(String serviceName, ClassLoader classLoader)
      Determine whether a class implementing the service identified by the supplied name is present and can be loaded. Will return false if either no class is found, or the class or one of its dependencies is not present or cannot be loaded.
      Parameters:
      serviceName - The name of the service to check.
      classLoader - The ClassLoader to use.
      Returns:
      whether an implementation of the specified service is present

    • loadClass

      public static Class<?> loadClass(String className, ClassLoader classLoader)
      Loads className using the class loader.
      Parameters:
      className - The name of the class to load.
      classLoader - The ClassLoader to use.
      Returns:
      the newly loaded class

    • guessLocationOnDisk

      public static Path guessLocationOnDisk(Class<?> aClass)
      Tries to get the physical location on disk of aClass.
      Parameters:
      aClass - The class to get the location for.
      Returns:
      The absolute path of the .class file (or null).

    • getStaticFieldValue

      public static String getStaticFieldValue(String className, String fieldName, ClassLoader classLoader)
      Gets the String value of a static field.
      Parameters:
      className - The fully qualified name of the class to instantiate.
      classLoader - The ClassLoader to use.
      fieldName - The field name
      Returns:
      The value of the field.
      Throws:
      MigrateDbException - If the field value cannot be read.

    • getStaticFieldValue

      public static String getStaticFieldValue(Class<?> clazz, String fieldName)
      Gets the String value of a static field.
      Throws:
      MigrateDbException - If the field value cannot be read.

    • defaultClassLoader

      public static ClassLoader defaultClassLoader()
      Returns:
      The first class loader that is non-null:
      1. Thread context class loader
      2. Class loader of this class
      3. System class loader

    • invoke

      public static <E extends Exception> Object invoke(Class<?> clazz, String methodName, Object receiver, Class<?>[] paramTypes, Object[] params, Function<? super Throwable,@Nullable E> exceptionMapper) throws E
      Throws:
      E extends Exception

    • getClassName

      public static String getClassName(@Nullable Object obj)