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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.common.MessageManager;
import com.scudata.common.RQException;
import com.scudata.dm.Context;
import com.scudata.expression.Function;
import com.scudata.expression.IParam;
import com.scudata.resources.EngineMessage;

// ifn(n1,??)
public class Ifn extends Function {
	/**
	 * ??????ʽ????Ч?ԣ???Ч???׳??쳣
	 */
	public void checkValidity() {
		if (param == null) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("ifn" + mm.getMessage("function.missingParam"));
		}
	}

	public Object calculate(Context ctx) {
		IParam param = this.param;
		if (param.isLeaf()) {
			return param.getLeafExpression().calculate(ctx);
		} else {
			int size = param.getSubSize();
			for (int i = 0; i < size; ++i) {
				IParam sub = param.getSub(i);
				if (sub != null) {
					Object obj = sub.getLeafExpression().calculate(ctx);
					if (obj != null) return obj;
				}
			}

			return null;
		}
	}
}