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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.expression;

import java.util.List;

import com.scudata.cellset.ICellSet;
import com.scudata.cellset.INormalCell;
import com.scudata.common.MessageManager;
import com.scudata.common.RQException;
import com.scudata.dm.Context;
import com.scudata.dm.ParamList;
import com.scudata.resources.EngineMessage;

/**
 * ?????ڵ????
 * @author WangXiaoJun
 *
 */
public abstract class Function extends Node {
	protected String functionName; // ??????
	protected String option; // ѡ??
	protected String strParam; // ?????????ַ????????ڼ?Ⱥ?????Ѳ????ַ????????ڵ??
	protected IParam param; // ????????

	protected ICellSet cs = null; // ???????
	protected static final int Default_Size = 4;

	/**
	 * ???ú???????
	 * @param cs ???????
	 * @param ctx ??????????
	 * @param param ?????????ַ???
	 */
	public void setParameter(ICellSet cs, Context ctx, String param) {
		strParam = param;
		this.cs = cs;
		this.param = ParamParser.parse(param, cs, ctx);
	}

	/**
	 * ȡ?????????ַ???
	 * @return
	 */
	public String getParamString() {
		return strParam;
	}
	
	/**
	 * ȡ??????
	 * @return String
	 */
	public String getFunctionName() {
		return functionName;
	}
	
	 /**
	  * ???ú?????
	  * @param name ??????
	  */
	public void setFunctionName(String name) {
		this.functionName = name;
	}
	
	/**
	 * ???غ???????
	 * @return IParam
	 */
	public IParam getParam() {
		return param;
	}

	/**
	 * ???ú???????
	 * @param param ????
	 */
	public void setParam(IParam param) {
		this.param = param;
	}

	/**
	 * ???ú???ѡ??
	 * @param opt ѡ??
	 */
	public void setOption(String opt) {
		option = opt;
	}

	/**
	 * ȡ????ѡ??
	 * @return String
	 */
	public String getOption() {
		return option;
	}

	/**
	 * ?????Ƿ????ָ??????
	 * @param name ??????
	 * @return boolean true????????false????????
	 */
	protected boolean containParam(String name) {
		if (param != null) {
			return param.containParam(name);
		} else {
			return false;
		}
	}

	/**
	 * ???ұ???ʽ???õ?????
	 * @param ctx ??????????
	 * @param resultList ???ֵ???õ??Ĳ????????ӵ???????
	 */
	protected void getUsedParams(Context ctx, ParamList resultList) {
		if (param != null) {
			param.getUsedParams(ctx, resultList);
		}
	}
	
	public void getUsedFields(Context ctx, List resultList) {
		if (param != null) {
			param.getUsedFields(ctx, resultList);
		}
	}
	
	/**
	 * ???ñ???ʽ?????ڱ???ʽ???棬???ִ??ʹ?ò?ͬ???????ģ?????????????йصĻ?????Ϣ
	 */
	public void reset() {
		if (param != null) {
			param.reset();
		}
	}

	protected void getUsedCells(List resultList) {
		if (param != null) {
			param.getUsedCells(resultList);
		}
	}

	/**
	 * ?Խڵ????Ż?
	 * @param ctx ??????????
	 * @param Node ?Ż???Ľڵ?
	 */
	public Node optimize(Context ctx) {
		boolean opt = true;
		if (param != null) {
			// ?Բ??????Ż?
			opt = param.optimize(ctx);
		}

		// ????????????ǳ?????????????ֵ
		// ??????????????뱻?Ż??ɳ?????Ҫ???ش˷???
		if (opt) {
			return new Constant(calculate(ctx));
		} else {
			return this;
		}
	}
	
	public Expression[] getParamExpressions(String funcName, boolean canNull) {
		IParam param = this.param;
		if (param == null) {
			if (canNull) {
				return null;
			} else {
				MessageManager mm = EngineMessage.get();
				throw new RQException(funcName + mm.getMessage("function.missingParam"));
			}
		}
		
		Expression []exps;
		if (param.isLeaf()) {
			exps = new Expression[]{param.getLeafExpression()};
		} else {
			int count = param.getSubSize();
			exps = new Expression[count];
			
			for (int i = 0; i < count; ++i) {
				IParam sub = param.getSub(i);
				if (sub != null) {
					exps[i] = sub.getLeafExpression();
				} else if (!canNull) {
					MessageManager mm = EngineMessage.get();
					throw new RQException(funcName + mm.getMessage("function.invalidParam"));
				}
			}
		}
		
		return exps;
	}
	
	/**
	 * ȡ??һ????????????????????ַ???
	 * @return	?ַ???
	 */
	public String getFunctionString() {
		String strRes = this.getFunctionName();
		
		if (null != option && 0 != option.length())
			strRes += "@" + option;
		
		strRes += "(";
		strRes += this.strParam;
		strRes += ")";
		
		return strRes;
	}

	/**
	 * ?жϽڵ??Ƿ???ָ??????
	 * @param name ??????
	 * @return true????ָ????????false??????
	 */
	public boolean isFunction(String name) {
		return name.equals(functionName);
	}
	
	/**
	 * ?ж??Ƿ???Լ???ȫ????ֵ???и?ֵ????ʱֻ??һ???м???
	 * @return
	 */
	public boolean canCalculateAll() {
		if (param != null) {
			return param.canCalculateAll();
		} else {
			return true;
		}
	}

	public ICellSet getCellSet() {
		return cs;
	}
}