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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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/*
 * Copyright (c) 2019, 2020, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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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);

}