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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.math;

import com.scudata.common.MessageManager;
import com.scudata.common.RQException;
import com.scudata.dm.Context;
import com.scudata.dm.Sequence;
import com.scudata.expression.Function;
import com.scudata.resources.EngineMessage;


/**
 * ?Ѳ?????ɶ?????????
 * @author yanjing
 *
 */
public class Bin extends Function {
	/**
	 * ??????ʽ????Ч?ԣ???Ч???׳??쳣
	 */
	public void checkValidity() {
		if (param == null) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("bin" + mm.getMessage("function.missingParam"));
		} else if (!param.isLeaf()) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("bin" + mm.getMessage("function.invalidParam"));
		}
	}

	public Object calculate(Context ctx) {
		Object result = param.getLeafExpression().calculate(ctx);
		String result1="";
		
		if (result != null && result instanceof Number) {
			result1=Long.toBinaryString(((Number)result).longValue());
		}
		
		int l=result1.length();
		char[] charArray=result1.toCharArray();
		Sequence seq=new Sequence(l);
		for(int i=0;i