com.scudata.expression.mfn.sequence.Count Maven / Gradle / Ivy

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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.sequence;

import com.scudata.common.MessageManager;
import com.scudata.common.RQException;
import com.scudata.dm.Context;
import com.scudata.expression.Expression;
import com.scudata.expression.SequenceFunction;
import com.scudata.resources.EngineMessage;

/**
 * ??????????ȡֵΪ?棨?ǿղ??Ҳ???false????Ԫ?صĸ???
 * A.count(), A.count(x)
 * @author RunQian
 *
 */
public class Count extends SequenceFunction {
	public Object calculate(Context ctx) {
		if (param == null) {
			return srcSequence.count();
		} else if (param.isLeaf()) {
			Expression exp = param.getLeafExpression();
			return srcSequence.count(exp, ctx);
		} else {
			MessageManager mm = EngineMessage.get();
			throw new RQException("count" + mm.getMessage("function.invalidParam"));
		}
	}
}