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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.algebra;

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

/**
 * ??????????ʽ
 * @author bd
 *
 */
public class Rankm extends Function{
	/**
	 * ??????ʽ????Ч?ԣ???Ч???׳??쳣
	 */
	public void checkValidity() {
		if (param == null) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("rankm" + mm.getMessage("function.missingParam"));
		} else if (!param.isLeaf()) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("rankm" + mm.getMessage("function.invalidParam"));
		}
	}

	public Object calculate(Context ctx) {
		Object result1 = param.getLeafExpression().calculate(ctx);
		if (!(result1 instanceof Sequence)) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("rankm" + mm.getMessage("function.paramTypeError"));
		}
		Matrix A = new Matrix((Sequence) result1);
		if (A.getCols() == 0 || A.getRows() == 0) {
			// ?վ?????ȷ???0
			return 0;
		}
		return A.rank();
	}
}