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package javax.lang.model.element;

import javax.lang.model.UnknownEntityException;


Indicates that an unknown kind of element was encountered. This can occur if the language evolves and new kinds of elements are added to the Element hierarchy. May be thrown by an element visitor to indicate that the visitor was created for a prior version of the language. 
Author:Joseph D. Darcy, Scott Seligman, Peter von der Ahé
See Also:
Since:1.6
/**
 * Indicates that an unknown kind of element was encountered.  This
 * can occur if the language evolves and new kinds of elements are
 * added to the {@code Element} hierarchy.  May be thrown by an
 * {@linkplain ElementVisitor element visitor} to indicate that the
 * visitor was created for a prior version of the language.
 *
 * @author Joseph D. Darcy
 * @author Scott Seligman
 * @author Peter von der Ahé
 * @see ElementVisitor#visitUnknown
 * @since 1.6
 */
public class UnknownElementException extends UnknownEntityException {

    private static final long serialVersionUID = 269L;

    private transient Element element;
    private transient Object parameter;

    
Creates a new UnknownElementException. The p parameter may be used to pass in an additional argument with information about the context in which the unknown element was encountered; for example, the visit methods of ElementVisitor may pass in their additional parameter. 
Params:
  • e – the unknown element, may be null
  • p – an additional parameter, may be null
/**
     * Creates a new {@code UnknownElementException}.  The {@code p}
     * parameter may be used to pass in an additional argument with
     * information about the context in which the unknown element was
     * encountered; for example, the visit methods of {@link
     * ElementVisitor} may pass in their additional parameter.
     *
     * @param e the unknown element, may be {@code null}
     * @param p an additional parameter, may be {@code null}
     */
    public UnknownElementException(Element e, Object p) {
        super("Unknown element: " + e);
        element = e;
        this.parameter = p;
    }

    
Returns the unknown element.
The value may be unavailable if this exception has been
serialized and then read back in.

Returns:the unknown element, or null if unavailable
/**
     * Returns the unknown element.
     * The value may be unavailable if this exception has been
     * serialized and then read back in.
     *
     * @return the unknown element, or {@code null} if unavailable
     */
    public Element getUnknownElement() {
        return element;
    }

    
Returns the additional argument.

Returns:the additional argument, or null if unavailable
/**
     * Returns the additional argument.
     *
     * @return the additional argument, or {@code null} if unavailable
     */
    public Object getArgument() {
        return parameter;
    }
}