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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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package com.sun.source.util;

import javax.lang.model.element.VariableElement;

/**
 * A provider for parameter names when the parameter names are not determined from
 * a reliable source, like a classfile.
 *
 * @since 13
 */
public interface ParameterNameProvider {

    /**
     * Infer a parameter name for the given parameter. The implementations of this method
     * should infer parameter names in such a way that the parameter names are distinct
     * for any given owning method.
     *
     * If the implementation of this method returns null, an automatically synthesized name is used.
     *
     * @param parameter the parameter for which the name should be inferred
     * @return a user-friendly name for the parameter, or null if unknown
     */
    public CharSequence getParameterName(VariableElement parameter);

}