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MDSplus interface (via lib or mdsip).
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package mds.data.descriptor_s;

import java.nio.ByteBuffer;
import mds.Mds;
import mds.MdsException;
import mds.data.CTX;
import mds.data.DATA;
import mds.data.DTYPE;
import mds.data.descriptor.Descriptor;
import mds.data.descriptor.Descriptor_S;
import mds.data.descriptor_s.Uint16.UShort;

public final class Pointer extends Descriptor_S implements DATA, CTX
{
	public static final UShort fromBuffer(final ByteBuffer b, final int idx)
	{
		return new UShort(b.getShort(idx));
	}

	public static final Pointer NULL()
	{
		final ByteBuffer b = ByteBuffer.allocateDirect(16).order(Descriptor.BYTEORDER);
		b.putShort((short) 8).put(DTYPE.POINTER.toByte()).put(Descriptor_S.CLASS);
		b.putInt(8).putLong(0).rewind();
		return new Pointer(b);
	}

	public Pointer(final ByteBuffer b)
	{
		super(b);
	}

	public Pointer(final int value)
	{
		super(DTYPE.POINTER, ByteBuffer.allocateDirect(Integer.BYTES).order(Descriptor.BYTEORDER).putInt(value));
	}

	public Pointer(final long value)
	{
		super(DTYPE.POINTER, ByteBuffer.allocateDirect(Long.BYTES).order(Descriptor.BYTEORDER).putLong(value));
	}

	@Override
	public final Descriptor abs() throws MdsException
	{
		throw DATA.dataerror;
	}

	@Override
	public Descriptor add(final Descriptor X, final Descriptor Y) throws MdsException
	{
		throw DATA.tdierror;
	}

	@Override
	public final StringBuilder decompile(final int prec, final StringBuilder pout, final int mode)
	{
		pout.append(this.getDTypeName());
		if (this.isNull())
			return pout.append("(0)");
		return pout.append("(0x")
				.append(this.length() == 4 ? Integer.toHexString(this.toInt()) : Long.toHexString(this.toLong()))
				.append(')');
	}

	@Override
	public Descriptor divide(final Descriptor X, final Descriptor Y) throws MdsException
	{
		throw DATA.tdierror;
	}

	public final long getAddress()
	{
		if (this.length() == 4)
			return this.getAtomic().longValue() & 0xFFFFFFFFl;
		return this.getAtomic().longValue();
	}

	public final int getAddress32()
	{ return this.getAtomic().intValue(); }

	@Override
	public final Number getAtomic()
	{
		if (this.length() == 4)
			return new Integer(this.p.getInt(0));
		return new Long(this.p.getLong(0));
	}

	@Override
	public final Pointer getDbid()
	{ return this; }

	@Override
	public Descriptor getLocal_(final FLAG local)
	{
		return this;
	}

	@Override
	public Mds getMds()
	{ return this.mds; }

	@Override
	public final byte getRank()
	{ return -1; }

	@Override
	public final Descriptor inot() throws MdsException
	{
		throw DATA.dataerror;
	}

	public final boolean isNull()
	{
		if (this.length() == 4)
			return this.b.getInt(Descriptor._ptrI + Integer.BYTES) == 0;
		return this.b.getLong(Descriptor._ptrI + Integer.BYTES) == 0l;
	}

	@Override
	public Descriptor multiply(final Descriptor X, final Descriptor Y) throws MdsException
	{
		throw DATA.tdierror;
	}

	@Override
	public final Descriptor neg() throws MdsException
	{
		return new Uint8(this.isNull() ? (byte) 1 : (byte) 0);
	}

	@Override
	public NUMBER power(final Descriptor X, final Descriptor Y) throws MdsException
	{
		throw DATA.tdierror;
	}

	public final void setAddress(final ByteBuffer val)
	{
		if (val.capacity() == 8)
			this.setAddress(val.getLong(0));
		else
			this.setAddress(val.getInt(0));
	}

	public final void setAddress(final int val)
	{
		if (this.length() == 8)
			this.b.putLong(this.pointer(), val);
		else
			this.b.putInt(this.pointer(), val);
	}

	public final void setAddress(final long val)
	{
		if (this.length() == 8)
			this.b.putLong(this.pointer(), val);
		else if ((val & 0xFFFFFFFFl) == val)
			this.b.putInt(this.pointer(), (int) val);
		else
			((ByteBuffer) this.b.duplicate().position(this.pointer())).put(new byte[this.length()]);
	}

	public final void setAddress(final Number value)
	{
		if (value instanceof Integer)
			this.setAddress(value.intValue());
		else if (value instanceof Long)
			this.setAddress(value.longValue());
	}

	@Override
	public Descriptor shiftleft(final Descriptor X) throws MdsException
	{
		throw DATA.tdierror;
	}

	@Override
	public Descriptor shiftright(final Descriptor X) throws MdsException
	{
		throw DATA.tdierror;
	}

	@Override
	public Descriptor subtract(final Descriptor X, final Descriptor Y) throws MdsException
	{
		throw DATA.tdierror;
	}

	@Override
	public final Missing text() throws MdsException
	{
		throw DATA.tdierror;
	}
}