Module jdk.dynalink
Package jdk.dynalink.beans

Class StaticClass

  • All Implemented Interfaces:
    Serializable

    public final class StaticClass
extends Object
implements Serializable
    Object that allows access to the static members of a class (its static methods, properties, and fields), as well as construction of instances using StandardOperation.NEW operation. In Dynalink, Class objects are not treated specially and act as ordinary Java objects; you can use e.g. GET:PROPERTY:superclass as a property getter to invoke clazz.getSuperclass(). On the other hand, you can not use Class objects to access static members of a class, nor to create new instances of the class using NEW. This is consistent with how Class objects behave in Java: in Java, you write e.g. new BitSet() instead of new BitSet.class(). Similarly, you write System.out and not System.class.out. It is this aspect of using a class name as the constructor and a namespace for static members that StaticClass embodies.

    Objects of this class are recognized by the BeansLinker as being special, and operations on them will be linked against the represented class' static members. The "class" synthetic property is additionally recognized and returns the Java Class object, just as in Java System.class evaluates to the Class object for the System class. Conversely, Class objects exposed through BeansLinker expose the "static" synthetic property which returns their StaticClass object (there is no equivalent to this in Java).

    In summary, instances of this class act as namespaces for static members and as constructors for classes, much the same way as specifying a class name in Java language does, except that in Java this is just a syntactic element, while in Dynalink they are expressed as actual objects.

    StaticClass objects representing Java array types will act as constructors taking a single int argument and create an array of the specified size.

    If the class has several constructors, StandardOperation.NEW on StaticClass will try to select the most specific applicable constructor. You might want to expose a mechanism in your language for selecting a constructor with an explicit signature through BeansLinker.getConstructorMethod(Class, String).

    See Also:
    Serialized Form

    • Method Detail

      • forClass

        public static StaticClass forClass​(Class<?> clazz)
        Retrieves the StaticClass instance for the specified class.
        Parameters:
        clazz - the class for which the static facet is requested.
        Returns:
        the StaticClass instance representing the specified class.

      • getRepresentedClass

        public Class<?> getRepresentedClass​()
        Returns the represented Java class.
        Returns:
        the represented Java class.

      • toString

        public String toString​()
        Description copied from class: Object
        Returns a string representation of the object. In general, the toString method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method.

        The toString method for class Object returns a string consisting of the name of the class of which the object is an instance, the at-sign character `@', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of: 

         getClass().getName() + '@' + Integer.toHexString(hashCode())
        Overrides:
        toString in class Object
        Returns:
        a string representation of the object.