Class ObjectUtilities

java.lang.Object
org.jfree.util.ObjectUtilities
public final class ObjectUtilities extends Object
A collection of useful static utility methods for handling classes and object instantiation.
Author:
Thomas Morgner

  • Field Details

  • Method Details

    • getClassLoaderSource

      public static String getClassLoaderSource()
      Returns the internal configuration entry, whether the classloader of the thread context or the context classloader should be used.
      Returns:
      the classloader source, either THREAD_CONTEXT or CLASS_CONTEXT.

    • setClassLoaderSource

      public static void setClassLoaderSource(String classLoaderSource)
      Defines the internal configuration entry, whether the classloader of the thread context or the context classloader should be used.

      This setting can only be defined using the API, there is no safe way to put this into an external configuration file.

      Parameters:
      classLoaderSource - the classloader source, either THREAD_CONTEXT or CLASS_CONTEXT.

    • equal

      public static boolean equal(Object o1, Object o2)
      Returns true if the two objects are equal OR both null.
      Parameters:
      o1 - object 1 (null permitted).
      o2 - object 2 (null permitted).
      Returns:
      true or false.

    • hashCode

      public static int hashCode(Object object)
      Returns a hash code for an object, or zero if the object is null.
      Parameters:
      object - the object (null permitted).
      Returns:
      The object's hash code (or zero if the object is null).

    • clone

      public static Object clone(Object object) throws CloneNotSupportedException
      Returns a clone of the specified object, if it can be cloned, otherwise throws a CloneNotSupportedException.
      Parameters:
      object - the object to clone (null not permitted).
      Returns:
      A clone of the specified object.
      Throws:
      CloneNotSupportedException - if the object cannot be cloned.

    • deepClone

      public static Collection deepClone(Collection collection) throws CloneNotSupportedException
      Returns a new collection containing clones of all the items in the specified collection.
      Parameters:
      collection - the collection (null not permitted).
      Returns:
      A new collection containing clones of all the items in the specified collection.
      Throws:
      CloneNotSupportedException - if any of the items in the collection cannot be cloned.

    • setClassLoader

      public static void setClassLoader(ClassLoader classLoader)
      Redefines the custom classloader.
      Parameters:
      classLoader - the new classloader or null to use the default.

    • getClassLoader

      public static ClassLoader getClassLoader()
      Returns the custom classloader or null, if no custom classloader is defined.
      Returns:
      the custom classloader or null to use the default.

    • getClassLoader

      public static ClassLoader getClassLoader(Class c)
      Returns the classloader, which was responsible for loading the given class.
      Parameters:
      c - the classloader, either an application class loader or the boot loader.
      Returns:
      the classloader, never null.
      Throws:
      SecurityException - if the SecurityManager does not allow to grab the context classloader.

    • getResource

      public static URL getResource(String name, Class c)
      Returns the resource specified by the absolute name.
      Parameters:
      name - the name of the resource
      c - the source class
      Returns:
      the url of the resource or null, if not found.

    • getResourceRelative

      public static URL getResourceRelative(String name, Class c)
      Returns the resource specified by the relative name.
      Parameters:
      name - the name of the resource relative to the given class
      c - the source class
      Returns:
      the url of the resource or null, if not found.

    • getResourceAsStream

      public static InputStream getResourceAsStream(String name, Class context)
      Returns the inputstream for the resource specified by the absolute name.
      Parameters:
      name - the name of the resource
      context - the source class
      Returns:
      the url of the resource or null, if not found.

    • getResourceRelativeAsStream

      public static InputStream getResourceRelativeAsStream(String name, Class context)
      Returns the inputstream for the resource specified by the relative name.
      Parameters:
      name - the name of the resource relative to the given class
      context - the source class
      Returns:
      the url of the resource or null, if not found.

    • loadAndInstantiate

      public static Object loadAndInstantiate(String className, Class source)
      Tries to create a new instance of the given class. This is a short cut for the common bean instantiation code.
      Parameters:
      className - the class name as String, never null.
      source - the source class, from where to get the classloader.
      Returns:
      the instantiated object or null, if an error occured.

    • loadAndInstantiate

      public static Object loadAndInstantiate(String className, Class source, Class type)
      Tries to create a new instance of the given class. This is a short cut for the common bean instantiation code. This method is a type-safe method and will not instantiate the class unless it is an instance of the given type.
      Parameters:
      className - the class name as String, never null.
      source - the source class, from where to get the classloader.
      type - the type.
      Returns:
      the instantiated object or null, if an error occurred.

    • isJDK14

      public static boolean isJDK14()
      Returns true if this is version 1.4 or later of the Java runtime.
      Returns:
      A boolean.