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package javassist.bytecode;

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

/**
 * <code>NestHost_attribute</code>.
 */
public class NestHostAttribute extends AttributeInfo {
    /**
     * The name of this attribute <code>"NestHost"</code>.
     */
    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 <code>Map</code> 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<String, String> classnames) {
        int hostIndex = ByteArray.readU16bit(get(), 0);
        int newHostIndex = getConstPool().copy(hostIndex, newCp, classnames);
        return new NestHostAttribute(newCp, newHostIndex);
    }
}