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

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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??ܵ????ӵļ??????ʽ???㴦????
 * op.run(xi,??) op.run(xi:Fi:,??) op???α??ܵ?
 * @author RunQian
 *
 */
public class Run extends Operation {
	private Expression exp; // ????ʽ?????Ϊ???????????xi:Fi??ʽ?Ĳ???
	
	private Expression []assignExps; // ?ֶ???????ʽ????
	private Expression []exps; // ֵ????ʽ????

	public Run(Expression exp) {
		this(null, exp);
	}
	
	public Run(Function function, Expression exp) {
		super(function);
		this.exp = exp;
	}
	
	public Run(Expression []assignExps, Expression []exps) {
		this(null, assignExps, exps);
	}

	public Run(Function function, Expression []assignExps, Expression []exps) {
		super(function);
		this.assignExps = assignExps;
		this.exps = exps;
	}
	
	/**
	 * ???????????ڶ??̼߳??㣬??Ϊ????ʽ???ܶ??̼߳???
	 * @param ctx ??????????
	 * @return Operation
	 */
	public Operation duplicate(Context ctx) {
		if (exp != null) {
			Expression dupExp = dupExpression(exp, ctx);
			return new Run(function, dupExp);
		} else {
			Expression []assignExps1 = dupExpressions(assignExps, ctx);
			Expression []exps1 = dupExpressions(exps, ctx);
			return new Run(function, assignExps1, exps1);
		}
	}

	/**
	 * ?????α??ܵ???ǰ???͵?????
	 * @param seq ????
	 * @param ctx ??????????
	 * @return
	 */
	public Sequence process(Sequence seq, Context ctx) {
		if (exp != null) {
			seq.run(exp, ctx);
		} else {
			seq.run(assignExps, exps, ctx);
		}

		return seq;
	}
}