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SPL(Structured Process Language) A programming language specially for structured data computing.
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package com.scudata.expression;

import java.util.ArrayList;
import java.util.List;

import com.scudata.cellset.INormalCell;
import com.scudata.dm.*;

/**
 * ?????????ӿ?
 * ???????????ö?????ṹ?洢
 * @author RunQian
 *
 */
public interface IParam {
	static final char NONE = 0; // ??û?в????ڵ㣬???ڲ???????????
	
	// ?????ڵ??????
	public static final char Semicolon = ';'; // ?????ֺŷָ???
	public static final char Comma = ',';     // ???????ŷָ???
	public static final char Colon = ':';     // ????ð?ŷָ???
	public static final char Normal = 0;      // Ҷ?ӽڵ?

	/**
	 * ???ؽڵ??????
	 * @return char Normal??Semicolon??Comma??Colon
	 */
	char getType();

	/**
	 * ?????Ƿ???Ҷ?ӽڵ?
	 * @return boolean true???ǣ?false??????
	 */
	boolean isLeaf();

	/**
	 * ?????ӽڵ?????Ҷ?ӽڵ㷵??0
	 * @return int ?ӽڵ???
	 */
	int getSubSize();

	/**
	 * ????ĳһ?ӽڵ?
	 * @param index ??ţ???0??ʼ????
	 * @return IParam ?ӽڵ?
	 */
	IParam getSub(int index);

	/**
	 * ???ص?ǰ?ڵ?ı???ʽ?ַ???????ǰ?ڵ?ΪҶ?ӽڵ?
	 * @return Expression
	 */
	Expression getLeafExpression();

	/**
	 * ȡ????Ҷ?ӽڵ?ı???ʽ
	 * @param List ???ֵ?????ڴ?ű???ʽ
	 */
	void getAllLeafExpression(ArrayList list);

	/**
	 * ???ر???ʽ???飬ֻ֧?ֵ???Ĳ???
	 * @param function ?????????????׳??쳣
	 * @param canNull ?????Ƿ?ɿ?
	 * @return ????ʽ????
	 */
	Expression[] toArray(String function, boolean canNull);
	
	/**
	 * ???ر???ʽ?ַ??????飬ֻ֧?ֵ???Ĳ???
	 * @param function ?????????????׳??쳣
	 * @param canNull ?????Ƿ?ɿ?
	 * @return ????ʽ??????
	 */
	String []toStringArray(String function, boolean canNull);
	
	/**
	 * ?????ֶ???????
	 * @param function ?????????????׳??쳣
	 * @return ?ֶ???????
	 */
	String []toIdentifierNames(String function);
	
	/**
	 * ?????Ƿ????ָ??????
	 * @param name ??????
	 * @return boolean true????????false????????
	 */
	boolean containParam(String name);

	/**
	 * ???ұ???ʽ???õ?????
	 * @param ctx ??????????
	 * @param resultList ???ֵ???õ??Ĳ????????ӵ???????
	 */
	void getUsedParams(Context ctx, ParamList resultList);
	
	/**
	 * ???ұ???ʽ?п????õ????ֶΣ?????ȡ?ò?׼ȷ???߰??????????
	 * @param ctx ??????????
	 * @param resultList ???ֵ???õ????ֶ????????ӵ???????
	 */
	void getUsedFields(Context ctx, List resultList);

	/**
	 * ???ұ???ʽ???õ???Ԫ??
	 * @param resultList ???ֵ???õ??ĵ?Ԫ??????ӵ???????
	 */
	void getUsedCells(List resultList);

	/**
	 * ?Ż?????????ʽ?????????в????Ƿ??ǳ???
	 * @param ctx ??????????
	 * @return boolean true???ǣ?false??????
	 */
	boolean optimize(Context ctx);

	/**
	 * ??start??end?ӽڵ㴴??һ???²???
	 * @param start ??ʼλ?ã?????
	 * @param end ????λ?ã???????
	 * @return IParam ?²???
	 */
	IParam create(int start, int end);

	/**
	 * ?ж??Ƿ???Լ???ȫ????ֵ???и?ֵ????ʱֻ??һ???м???
	 * @return
	 */
	boolean canCalculateAll();
	
	/**
	 * ???ñ???ʽ?????ڱ???ʽ???棬???ִ??ʹ?ò?ͬ???????ģ?????????????йصĻ?????Ϣ
	 */
	void reset();
}