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MDSplus interface (via lib or mdsip).

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package mds.data.descriptor_r.function;

import java.nio.ByteBuffer;
import mds.MdsException;
import mds.data.DATA;
import mds.data.DTYPE;
import mds.data.OPC;
import mds.data.descriptor.Descriptor;
import mds.data.descriptor_r.Function;
import mds.data.descriptor_s.Missing;

public class Fun extends Function
{
	public Fun(final ByteBuffer b)
	{
		super(b);
	}

	public Fun(final Descriptor a, final Descriptor b)
	{
		super(OPC.OpcFun, a, b);
	}

	public Fun(final Descriptor[] args)
	{
		super(OPC.OpcFun, args);
	}

	@Override
	public final StringBuilder decompile(final int prec, final StringBuilder pout, final int mode)
	{
		if (prec < Descriptor.P_STMT)
			pout.append('(');
		pout.append("Fun ");
		final Descriptor ptr = this.getDescriptor(0);
		if (ptr.dtype() == DTYPE.T)
			pout.append(ptr.toString());
		else
			ptr.decompile(Descriptor.P_SUBS, pout, mode & ~Descriptor.DECO_X);
		this.addArguments(2, " (", ") ", pout, mode);
		Function.addCompoundStatement(1, this, 1, pout, mode);
		if (prec < Descriptor.P_STMT)
			pout.append(')');
		return pout;
	}

	@Override
	public final Descriptor evaluate()
	{
		try
		{
			final DATA[] args = Descriptor.getDATAs(this.getArguments());
			return BINARY.getCommon(args).add(args[0].toDescriptor(), args[1].toDescriptor());
		}
		catch (final MdsException e)
		{
			System.err.println(e.getMessage());
			return Missing.NEW;
		}
	}
}