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

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package com.scudata.expression.operator;

import com.scudata.common.MessageManager;
import com.scudata.common.RQException;
import com.scudata.dm.Context;
import com.scudata.expression.Operator;
import com.scudata.resources.EngineMessage;
import com.scudata.util.Variant;

/**
 * ???????*=
 * ?˵???
 * @author RunQian
 *
 */
public class MultiplyAssign extends Operator {
	public MultiplyAssign() {
		priority = PRI_EVL;
	}

	/**
	 * ??????ʽ????Ч?ԣ???Ч???׳??쳣
	 */
	public void checkValidity() {
		if (left == null) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("\"*=\"" + mm.getMessage("operator.missingLeftOperation"));
		} else if (right == null) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("\"*=\"" + mm.getMessage("operator.missingRightOperation"));
		}
		
		left.checkValidity();
		right.checkValidity();
	}

	public Object calculate(Context ctx) {
		Object o1 = left.calculate(ctx);
		Object o2 = right.calculate(ctx);
		return left.assign(Variant.multiply(o1, o2), ctx);
	}

	/**
	 * ?ж??Ƿ???Լ???ȫ????ֵ???и?ֵ????ʱֻ??һ???м???
	 * @return
	 */
	public boolean canCalculateAll() {
		return false;
	}
}