package org.handwerkszeug.dns.record;

import java.util.Arrays;
import java.util.List;

import org.handwerkszeug.dns.NameCompressor;
import org.handwerkszeug.dns.RRType;
import org.handwerkszeug.dns.ResourceRecord;
import org.handwerkszeug.dns.nls.Messages;
import org.handwerkszeug.util.CompareUtil;

import io.netty.buffer.ByteBuf;

/**
 * 3.3.10. NULL RDATA format (EXPERIMENTAL)
 *
 * @author taichi
 */
public
class NULLRecord extends AbstractRecord<NULLRecord> {

    /**
     * Anything at all may be in the RDATA field so long as it is 65535 octets
     * or less.
     */
    protected byte[] anything;

    public
    NULLRecord() {
        super(RRType.NULL);
    }

    public
    NULLRecord(NULLRecord from) {
        super(from);
        byte[] ary = from.anything();
        if (ary != null) {
            this.anything(Arrays.copyOf(ary, ary.length));
        }
    }

    public
    byte[] anything() {
        return this.anything;
    }

    public
    void anything(byte[] data) {
        if (65535 < data.length) {
            throw new IllegalArgumentException(String.format(Messages.DataMustBe65535orLess, data.length));
        }
        this.anything = data;
    }

    @Override
    protected
    void parseRDATA(ByteBuf buffer) {
        this.anything = new byte[rdlength()];
        buffer.readBytes(this.anything);
    }

    @Override
    protected
    void writeRDATA(ByteBuf buffer, NameCompressor compressor) {
        buffer.writeBytes(anything());
    }

    @Override
    protected
    ResourceRecord newInstance() {
        return new NULLRecord(this);
    }

    @Override
    public
    int compareTo(NULLRecord o) {
        if ((this != o) && (super.compareTo(o) == 0)) {
            return CompareUtil.compare(this.anything(), o.anything());
        }
        return 0;
    }

    @Override
    public
    void setRDATA(List<String> list) {
        throw new UnsupportedOperationException();
    }
}