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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.convert;

import com.scudata.common.MessageManager;
import com.scudata.common.RQException;
import com.scudata.dm.BaseRecord;
import com.scudata.dm.Context;
import com.scudata.dm.Sequence;
import com.scudata.expression.Function;
import com.scudata.expression.IParam;
import com.scudata.resources.EngineMessage;
import com.scudata.util.XMLUtil;

/**
 * xml(x,s) ??xΪxml??ʱ??????Ϊ??????أ???xΪ???ʱ????Ϊxml?????ء?
 * @author runqian
 *
 */
public class Xml extends Function {
	/**
	 * ??????ʽ????Ч?ԣ???Ч???׳??쳣
	 */
	public void checkValidity() {
		if (param == null) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("xml" + mm.getMessage("function.missingParam"));
		}
	}

	public Object calculate(Context ctx) {
		Object val;
		String s = null;
		if (param.isLeaf()) {
			val = param.getLeafExpression().calculate(ctx);
		} else if (param.getSubSize() == 2) {
			IParam sub0 = param.getSub(0);
			IParam sub1 = param.getSub(1);
			if (sub0 == null || sub1 == null) {
				MessageManager mm = EngineMessage.get();
				throw new RQException("xml" + mm.getMessage("function.invalidParam"));
			}
			
			val = sub0.getLeafExpression().calculate(ctx);
			Object obj = sub1.getLeafExpression().calculate(ctx);
			if (obj instanceof String) {
				s = (String)obj;
			} else if (obj != null) {
				MessageManager mm = EngineMessage.get();
				throw new RQException("xml" + mm.getMessage("function.paramTypeError"));
			}
		} else {
			MessageManager mm = EngineMessage.get();
			throw new RQException("xml" + mm.getMessage("function.invalidParam"));
		}
		
		if (val instanceof String) {
			//if (option == null || option.indexOf('s') == -1) {
				return XMLUtil.parseXml((String)val, s, option);
			//} else {
			//	return XMLUtil.parseXmlString((String)val);
			//}
		} else if (val instanceof Sequence) {
			return XMLUtil.toXml((Sequence)val, null, s);
		} else if (val instanceof BaseRecord) {
			return XMLUtil.toXml((BaseRecord)val, null, s);
		} else if (val == null) {
			return null;
		} else {
			MessageManager mm = EngineMessage.get();
			throw new RQException("xml" + mm.getMessage("function.paramTypeError"));
		}
	}
}