com.scudata.expression.fn.Register Maven / Gradle / Ivy

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

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package com.scudata.expression.fn;

import com.scudata.common.MessageManager;
import com.scudata.common.RQException;
import com.scudata.dm.Context;
import com.scudata.expression.Function;
import com.scudata.expression.FunctionLib;
import com.scudata.expression.IParam;
import com.scudata.expression.Node;
import com.scudata.resources.EngineMessage;

/**
 * ??dfx?ļ??Ǽ?Ϊ????
 * register(f,dfx) 
 * ?Ǽ?dfx?ļ?Ϊ????f??֮??ú??????????????ű???ʹ?ã?????????ʽд??Ϊ??f(xi,...)??????xi,...Ϊdfx?ļ??еĲ?????
 * ??????????ö??ŷָ???
 * @author runqian
 *
 */
public class Register extends Function {
	public Node optimize(Context ctx) {
		return this;
	}
	
	/**
	 * ??????ʽ????Ч?ԣ???Ч???׳??쳣
	 */
	public void checkValidity() {
		if (param == null) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("register" + mm.getMessage("function.missingParam"));
		}
	}

	public Object calculate(Context ctx) {
		if (param.isLeaf()) {
			Object name = param.getLeafExpression().calculate(ctx);
			if (!(name instanceof String)) {
				MessageManager mm = EngineMessage.get();
				throw new RQException("register" + mm.getMessage("function.paramTypeError"));
			}
			
			FunctionLib.removeDFXFunction((String)name);
			return name;
		} else if (param.getSubSize() != 2) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("register" + mm.getMessage("function.invalidParam"));
		}
		
		IParam sub0 = param.getSub(0);
		IParam sub1 = param.getSub(1);
		if (sub0 == null || sub1 == null) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("register" + mm.getMessage("function.invalidParam"));
		}
		
		Object name = sub0.getLeafExpression().calculate(ctx);
		if (!(name instanceof String)) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("register" + mm.getMessage("function.paramTypeError"));
		}
		
		Object dfx = sub1.getLeafExpression().calculate(ctx);
		if (!(dfx instanceof String)) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("register" + mm.getMessage("function.paramTypeError"));
		}
		
		FunctionLib.addDFXFunction((String)name, (String)dfx);
		return name;
	}
}