com.scudata.dm.op.Calculate Maven / Gradle / Ivy

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

There is a newer version: 20240823

package com.scudata.dm.op;

import com.scudata.dm.Context;
import com.scudata.dm.Sequence;
import com.scudata.expression.Expression;
import com.scudata.expression.Function;

/**
 * ?α??ܵ????ӳټ??㴦????
 * @author RunQian
 *
 */
public class Calculate extends Operation {
	private Expression exp; // ???????ʽ

	/**
	 * ?????????
	 * @param exp ???????ʽ
	 */
	public Calculate(Expression exp) {
		this(null, exp);
	}
	
	/**
	 * ?????????
	 * @param function ??ǰ??????Ӧ?ı???ʽ??ĺ???
	 * @param exp ???????ʽ
	 */
	public Calculate(Function function, Expression exp) {
		super(function);
		this.exp = exp;
	}
	
	/**
	 * ???????????ڶ??̼߳??㣬??Ϊ????ʽ???ܶ??̼߳???
	 * @param ctx ??????????
	 * @return Operation
	 */
	public Operation duplicate(Context ctx) {
		Expression dupExp = dupExpression(exp, ctx);
		return new Calculate(function, dupExp);
	}
	
	/**
	 * ?????α??ܵ???ǰ???͵?????
	 * @param seq ????
	 * @param ctx ??????????
	 * @return
	 */
	public Sequence process(Sequence seq, Context ctx) {
		return seq.calc(exp, ctx);
	}
}