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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) 2006, 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).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package javax.annotation.processing;

/**
 * Utility class for assembling {@link Completion} objects.
 *
 * @author Joseph D. Darcy
 * @author Scott Seligman
 * @author Peter von der Ahé
 * @since 1.6
 */
public class Completions {
    // No instances for you.
    private Completions() {}

    private static class SimpleCompletion implements Completion {
        private String value;
        private String message;

        SimpleCompletion(String value, String message) {
            if (value == null || message == null)
                throw new NullPointerException("Null completion strings not accepted.");
            this.value = value;
            this.message = message;
        }

        public String getValue() {
            return value;
        }


        public String getMessage() {
            return message;
        }

        @Override
        public String toString() {
            return "[\"" + value + "\", \"" + message + "\"]";
        }
        // Default equals and hashCode are fine.
    }

    /**
     * {@return a completion of the value and message}
     *
     * @param value the text of the completion
     * @param message a message about the completion
     */
    public static Completion of(String value, String message) {
        return new SimpleCompletion(value, message);
    }

    /**
     * {@return a completion of the value and an empty message}
     *
     * @param value the text of the completion
     */
    public static Completion of(String value) {
        return new SimpleCompletion(value, "");
    }
}