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SPL(Structured Process Language) A programming language specially for structured data computing.

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package com.scudata.expression.fn;

import com.scudata.array.ConstArray;
import com.scudata.array.IArray;
import com.scudata.cellset.datamodel.PgmCellSet;
import com.scudata.common.MessageManager;
import com.scudata.common.RQException;
import com.scudata.dm.Context;
import com.scudata.dm.FileObject;
import com.scudata.dm.ParamList;
import com.scudata.dm.Sequence;
import com.scudata.expression.Function;
import com.scudata.resources.EngineMessage;

/**
 * ???ص?ǰ????Ĳ??????б?
 * arguments()
 * @author RunQian
 *
 */
public class Arguments extends Function {
	public Object calculate(Context ctx) {
		ParamList paramList = null;
		if (param != null) {
			Object obj = param.getLeafExpression().calculate(ctx);
			FileObject fo;
			
			if (obj instanceof FileObject) {
				fo = (FileObject)obj;
			} else if (obj instanceof String) {
				fo = new FileObject((String)obj);
			} else {
				MessageManager mm = EngineMessage.get();
				throw new RQException("arguments" + mm.getMessage("function.paramTypeError"));
			}
			
			PgmCellSet cs = fo.readPgmCellSet();
			paramList = cs.getParamList();
		} else if (cs instanceof PgmCellSet) {
			paramList = ((PgmCellSet)cs).getParamList();
		}
		
		if (paramList != null && paramList.count() > 0) {
			int count = paramList.count();
			Sequence seq = new Sequence(count);
			
			for (int i = 0; i < count; ++i) {
				String name = paramList.get(i).getName();
				seq.add(name);
			}
			
			return seq;
		} else {
			return new Sequence(0);
		}
	}

	/**
	 * ??????????еĽ??
	 * @param ctx ??????????
	 * @return IArray
	 */
	public IArray calculateAll(Context ctx) {
		Sequence sequence = ctx.getComputeStack().getTopSequence();
		Object value = calculate(ctx);
		return new ConstArray(value, sequence.length());
	}
	
	/**
	 * ????signArray??ȡֵΪsign????
	 * @param ctx
	 * @param signArray ?б?ʶ????
	 * @param sign ??ʶ
	 * @return IArray
	 */
	public IArray calculateAll(Context ctx, IArray signArray, boolean sign) {
		Sequence sequence = ctx.getComputeStack().getTopSequence();
		Object value = calculate(ctx);
		return new ConstArray(value, sequence.length());
	}
}