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SPL(Structured Process Language) A programming language specially for structured data computing.
There is a newer version: 20241126
package com.scudata.dm.op;

import com.scudata.cellset.ICellSet;
import com.scudata.cellset.INormalCell;
import com.scudata.dm.Context;
import com.scudata.dm.Sequence;
import com.scudata.expression.Expression;
import com.scudata.expression.Function;

/**
 * ?α?͹ܵ??ӳټ??㺯??????
 * @author RunQian
 *
 */
public abstract class Operation {
	protected Function function; // ??ǰ??????Ӧ?ı???ʽ??ĺ???
	protected INormalCell currentCell; // ???????ڵĵ?Ԫ??
	
	/**
	 * ???캯??
	 */
	public Operation() {
	}
	
	/**
	 * ???캯??
	 * @param function ??ǰ??????Ӧ?ı???ʽ??ĺ???
	 */
	public Operation(Function function) {
		this.function = function;
		ICellSet cs = function == null ? null : function.getCellSet();
		if (cs != null) {
			currentCell = cs.getCurrent();
		}
	}
	
	/**
	 * ȡ??ǰ??????Ӧ?ı???ʽ??ĺ???
	 * @return Function
	 */
	public Function getFunction() {
		return function;
	}
	
	/**
	 * ???õ?ǰ??????Ӧ?ı???ʽ??ĺ???
	 * @param function
	 */
	public void setFunction(Function function) {
		this.function = function;
	}
	
	/**
	 * ?????α??ܵ???ǰ???͵?????
	 * @param seq ????
	 * @param ctx ??????????
	 * @return
	 */
	public abstract Sequence process(Sequence seq, Context ctx);
	
	/**
	 * ȡ?????Ƿ?????Ԫ????????????˺???????ټ?¼
	 * ?˺????????α?ľ?ȷȡ??????????ӵĲ???????ʹ??¼????????ֻ?谴?????????ȡ??????
	 * @return true???ᣬfalse??????
	 */
	public boolean isDecrease() {
		return false;
	}
	
	/**
	 * ????ȫ?????????ʱ???ã?group??????Ҫ֪?????ݽ?????ȷ?????һ???????
	 * @param ctx ??????????
	 * @return ???ӵĲ????????????
	 */
	public Sequence finish(Context ctx) {
		return null;
	}
	
	/**
	 * ???????????ڶ??̼߳??㣬??Ϊ????ʽ???ܶ??̼߳???
	 * @param ctx ??????????
	 * @return Operation
	 */
	public abstract Operation duplicate(Context ctx);
	
	/**
	 * ???Ʊ???ʽ
	 * @param exp ????ʽ
	 * @param ctx ??????????
	 * @return ???ƺ?ı???ʽ
	 */
	public static Expression dupExpression(Expression exp, Context ctx) {
		if (exp != null) {
			return exp.newExpression(ctx);
		} else {
			return null;
		}
	}
	
	/**
	 * ???Ʊ???ʽ????
	 * @param exps ????ʽ????
	 * @param ctx ??????????
	 * @return ???ƺ?ı???ʽ????
	 */
	public static Expression[] dupExpressions(Expression []exps, Context ctx) {
		if (exps == null) {
			return null;
		}
		
		int len = exps.length;
		Expression []dupExps = new Expression[len];
		for (int i = 0; i < len; ++i) {
			if (exps[i] != null) dupExps[i] = exps[i].newExpression(ctx);
		}
		
		return dupExps;
	}
	
	/**
	 * ???Ʊ???ʽ?????????
	 * @param exps ????ʽ?????????
	 * @param ctx ??????????
	 * @return ???ƺ?ı???ʽ?????????
	 */
	public static Expression[][] dupExpressions(Expression [][]exps, Context ctx) {
		if (exps == null) {
			return null;
		}
		
		int len = exps.length;
		Expression [][]dupExps = new Expression[len][];
		for (int i = 0; i < len; ++i) {
			dupExps[i] = dupExpressions(exps[i], ctx);
		}
		
		return dupExps;
	}

	public INormalCell getCurrentCell() {
		return currentCell;
	}

	public void setCurrentCell(INormalCell currentCell) {
		this.currentCell = currentCell;
	}
}