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"nb-javac" is a patched version of OpenJDK "javac", i.e., the Java compiler. This has long been part of NetBeans, providing a highly tuned Java compiler specifically for the Java editor i.e., parsing and lexing for features such as syntax coloring, code completion.
/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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package javax.lang.model.element;
import javax.lang.model.UnknownEntityException;
/**
* Indicates that an unknown kind of module directive was encountered.
* This can occur if the language evolves and new kinds of directives are
* added to the {@code Directive} hierarchy. May be thrown by a
* {@linkplain ModuleElement.DirectiveVisitor directive visitor} to
* indicate that the visitor was created for a prior version of the language.
*
* @see ModuleElement.DirectiveVisitor#visitUnknown
* @since 9
*/
public class UnknownDirectiveException extends UnknownEntityException {
private static final long serialVersionUID = 269L;
private final transient ModuleElement.Directive directive;
private final transient Object parameter;
/**
* 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 directive was
* encountered; for example, the visit methods of {@link
* ModuleElement.DirectiveVisitor DirectiveVisitor} may pass in
* their additional parameter.
*
* @param d the unknown directive, may be {@code null}
* @param p an additional parameter, may be {@code null}
*/
public UnknownDirectiveException(ModuleElement.Directive d, Object p) {
super("Unknown directive: " + d);
directive = d;
parameter = p;
}
/**
* Returns the unknown directive.
* The value may be unavailable if this exception has been
* serialized and then read back in.
*
* @return the unknown directive, or {@code null} if unavailable
*/
public ModuleElement.Directive getUnknownDirective() {
return directive;
}
/**
* Returns the additional argument.
*
* @return the additional argument, or {@code null} if unavailable
*/
public Object getArgument() {
return parameter;
}
}