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

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package com.scudata.expression.mfn.op;

import com.scudata.common.MessageManager;
import com.scudata.common.RQException;
import com.scudata.dm.Context;
import com.scudata.expression.Expression;
import com.scudata.expression.IParam;
import com.scudata.expression.OperableFunction;
import com.scudata.expression.mfn.sequence.FJoin;
import com.scudata.resources.EngineMessage;

/**
 * ???Aÿһ?м???w???????w????x??Ϊ???ֶ?F??TΪw?ı?????????x?У?x??~??ʾw??????F????A???????¸?ֵ
 * cs.fjoin(w:T,x:F,??;??)
 * @author RunQian
 *
 */
public class AttachFJoin extends OperableFunction {
	/**
	 * ??????ʽ????Ч?ԣ???Ч???׳??쳣
	 */
	public void checkValidity() {
		if (param == null) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("fjoin" + mm.getMessage("function.missingParam"));
		}
	}

	public Object calculate(Context ctx) {
		Expression[] dimExps;
		String []aliasNames;
		Expression [][]newExps;
		String [][]newNames;
		
		if (param.getType() == IParam.Semicolon) {
			int count = param.getSubSize();
			dimExps = new Expression[count];
			aliasNames = new String[count];
			newExps = new Expression[count][];
			newNames = new String[count][];

			for (int i = 0; i < count; ++i) {
				IParam sub = param.getSub(i);
				if (sub == null) {
					MessageManager mm = EngineMessage.get();
					throw new RQException("fjoin" + mm.getMessage("function.invalidParam"));
				}

				FJoin.parseJoinItem(sub, i, dimExps, aliasNames, newExps, newNames, ctx);
			}
		} else {
			dimExps = new Expression[1];
			aliasNames = new String[1];
			newExps = new Expression[1][];
			newNames = new String[1][];

			FJoin.parseJoinItem(param, 0, dimExps, aliasNames, newExps, newNames, ctx);
		}
		
		return operable.fjoin(this, dimExps, aliasNames, newExps, newNames, option, ctx);
	}
}