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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.array.ConstArray;
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;

/**
 * ???????++
 * ???г?Ա???
 * @author RunQian
 *
 */
public class MemAdd extends Operator {
	public MemAdd() {
		priority = PRI_ADD;
	}
	
	/**
	 * ??????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 obj = left.calculate(ctx);
		if (obj instanceof Sequence) {
			Sequence seq = (Sequence)obj;
			obj = right.calculate(ctx);
			
			if (obj instanceof Sequence) {
				return seq.memberAdd((Sequence)obj);
			} else {
				ConstArray array = new ConstArray(obj, seq.length());
				return seq.memberAdd(new Sequence(array));
			}
		} else if (obj == null) {
			Object obj2 = right.calculate(ctx);
			if (obj2 instanceof Sequence) {
				return obj2;
			} else {
				return null;
			}
		} else {
			Object obj2 = right.calculate(ctx);
			if (obj2 instanceof Sequence) {
				Sequence seq = (Sequence)obj2;
				ConstArray array = new ConstArray(obj, seq.length());
				return seq.memberAdd(new Sequence(array));
			} else if (obj2 == null) {
				return null;
			} else {
				MessageManager mm = EngineMessage.get();
				throw new RQException("\"++\"" + mm.getMessage("function.paramTypeError"));
			}
		}
	}
}