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

import java.math.BigInteger;
import java.nio.ByteBuffer;

import mds.MdsException;
import mds.data.DTYPE;
import mds.data.TREE;
import mds.data.descriptor_a.EmptyArray;
import mds.data.descriptor_r.function.COMPRESSION;
import mds.mdsip.Message;

/** Compressed Array Descriptor (-61 : 195) **/
public class Descriptor_CA extends ARRAY
{
	public static final byte CLASS = -61;// 195

	public static final Descriptor_CA deserialize(final ByteBuffer b)
	{
		return new Descriptor_CA(b);
	}

	public Descriptor_A decmprs;
	private final Descriptor_R payload;

	public Descriptor_CA(final ByteBuffer b)
	{
		super(b);
		this.payload = null;
	}

	public Descriptor_CA(final ByteBuffer header, final Descriptor_R payload)
	{
		super(header);
		this.payload = payload;
	}

	@Override
	@SuppressWarnings("unchecked")
	public final StringBuilder decompile(final int prec, final StringBuilder pout, final int mode)
	{
		if (this.payload() == null)
			return this.substitute(pout);
		if (this.getLength() > 256)
			try
			{
				@SuppressWarnings("rawtypes")
				final Descriptor_A that = COMPRESSION.decompress(this, 1);
				if (that.format())
					pout.append(this.getDTypeName()).append('(');
				pout.append("Set_Range(");
				if (that.dimct() == 0)
					pout.append("0,");
				else
					for (int i = 0; i < this.dimct(); i++)
						pout.append(Integer.toString(this.dims(i))).append(',');
				that.decompile(pout, that.getElement(0));
				if (that.format())
					pout.append(that.getSuffix());
				pout.append(ARRAY.ETC);
				if (that.format())
					pout.append(')');
				return pout;
			}
			catch (final MdsException e)
			{
				e.printStackTrace();
				return this.payload().decompile(prec, pout, mode);
			}
		return this.unpack().decompile(prec, pout, mode);
	}

	@Override
	public final int dims(final int idx)
	{
		if (this.dimct() > 1)
			return this.b.getInt(ARRAY._dmsIa + idx * Integer.BYTES);
		return idx == 0 ? this.arsize() / this.length() : 0;
	}

	@Override
	public ByteBuffer getAtomic()
	{
		return this.getBuffer();
	}

	@Override
	public final Descriptor getData(final DTYPE... omits)
	{
		return this.pointer() == 0 ? null : this.unpack().getData(omits);
	}

	@Override
	public final Descriptor getHelp()
	{
		return null;
	}

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

	@Override
	public boolean isLocal()
	{
		return true;
	}

	public final Descriptor_R payload()
	{
		if (this.payload != null)
			return this.payload;
		if (this.pointer() == 0)
			return null;
		try
		{
			return (Descriptor_R) Descriptor_R.deserialize(this.getBuffer()).setTree(this.tree);
		}
		catch (final MdsException e)
		{
			return null;
		}
	}

	@Override
	public final Descriptor setTree(final TREE tree)
	{
		super.setTree(tree);
		if (this.payload != null)
			this.payload.setTree(tree);
		if (this.decmprs != null)
			this.decmprs.setTree(tree);
		return this;
	}

	private final StringBuilder substitute(final StringBuilder pout)
	{
		return pout.append("ZERO(").append(this.arsize() / this.length()).append(", 0").append(this.dtype().suffix)
				.append(')');
	}

	@Override
	public final BigInteger[] toBigIntegerArray()
	{
		return this.pointer() == 0 ? null : this.unpack().toBigIntegerArray();
	}

	@Override
	public final byte[] toByteArray()
	{
		return this.pointer() == 0 ? null : this.unpack().toByteArray();
	}

	@Override
	public final double[] toDoubleArray()
	{
		return this.pointer() == 0 ? null : this.unpack().toDoubleArray();
	}

	@Override
	public final float[] toFloatArray()
	{
		return this.pointer() == 0 ? null : this.unpack().toFloatArray();
	}

	@Override
	public final int[] toIntArray()
	{
		return this.pointer() == 0 ? null : this.unpack().toIntArray();
	}

	@Override
	public final long[] toLongArray()
	{
		return this.pointer() == 0 ? null : this.unpack().toLongArray();
	}

	@Override
	public final Message toMessage(final byte descr_idx, final byte n_args, final byte msgid) throws MdsException
	{
		return this.payload.toMessage(descr_idx, n_args, msgid);
	}

	@Override
	public short[] toShortArray()
	{
		return this.pointer() == 0 ? null : this.unpack().toShortArray();
	}

	@Override
	public final String[] toStringArray()
	{
		return this.pointer() == 0 ? null : this.unpack().toStringArray();
	}

	public final Descriptor_A unpack()
	{
		if (this.decmprs != null)
			return this.decmprs;
		try
		{
			if (this.isLocal() && this.use_mds_local())
				return (Descriptor_A) Descriptor.mds_local.getDescriptor("DATA($)", this);
			return (this.decmprs = COMPRESSION.decompress(this));
		}
		catch (final MdsException e)
		{
			e.printStackTrace();
			return EmptyArray.NEW;
		}
	}
}