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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.dm.Sequence;
import com.scudata.expression.Operator;
import com.scudata.resources.EngineMessage;

/**
 * ???????|=
 * ??????͸?ֵ
 * @author RunQian
 *
 */
public class ConjAssign extends Operator {
	public ConjAssign() {
		priority = PRI_MUL;
	}
	
	/**
	 * ??????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);
		Sequence s1, s2;

		if (o1 instanceof Sequence) {
			s1 = (Sequence)o1;
		} else if (o1 == null) {
			s1 = new Sequence(0);
		} else {
			s1 = new Sequence(1);
			s1.add(o1);
		}

		if (o2 instanceof Sequence) {
			s2 = (Sequence)o2;
		} else if (o2 == null) {
			s2 = new Sequence(0);
		} else {
			s2 = new Sequence(1);
			s2.add(o2);
		}
		
		Sequence result = s1.conj(s2, false);
		return left.assign(result, ctx);
	}

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