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Javassist (JAVA programming ASSISTant) makes Java bytecode manipulation simple. It is a class library for editing bytecodes in Java.

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/*
 * Javassist, a Java-bytecode translator toolkit.
 * Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License.  Alternatively, the contents of this file may be used under
 * the terms of the GNU Lesser General Public License Version 2.1 or later,
 * or the Apache License Version 2.0.
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 */

package javassist.bytecode;

import java.io.DataInputStream;
import java.io.IOException;
import java.util.Map;

/**
 * NestHost_attribute.
 * It was introduced by JEP-181.  See JVMS 4.7.28 for the specification.
 *
 * @since 3.24
 */
public class NestHostAttribute extends AttributeInfo {
    /**
     * The name of this attribute "NestHost".
     */
    public static final String tag = "NestHost";

    NestHostAttribute(ConstPool cp, int n, DataInputStream in) throws IOException {
        super(cp, n, in);
    }

    private NestHostAttribute(ConstPool cp, int hostIndex) {
        super(cp, tag, new byte[2]);
        ByteArray.write16bit(hostIndex, get(), 0);
    }

    /**
     * Makes a copy.  Class names are replaced according to the
     * given Map object.
     *
     * @param newCp     the constant pool table used by the new copy.
     * @param classnames        pairs of replaced and substituted
     *                          class names.
     */
    @Override
    public AttributeInfo copy(ConstPool newCp, Map classnames) {
        int hostIndex = ByteArray.readU16bit(get(), 0);
        int newHostIndex = getConstPool().copy(hostIndex, newCp, classnames);
        return new NestHostAttribute(newCp, newHostIndex);
    }

    /**
     * Returns host_class_index.  The constant pool entry
     * at this entry is a CONSTANT_Class_info structure.
     * @return the value of host_class_index.
     */
    public int hostClassIndex() {
        return ByteArray.readU16bit(info, 0);
    }
}