com.scudata.expression.mfn.file.XlsOpen 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.mfn.file;

import com.scudata.common.MessageManager;
import com.scudata.common.RQException;
import com.scudata.dm.Context;
import com.scudata.excel.FileXls;
import com.scudata.excel.FileXlsR;
import com.scudata.excel.XlsFileObject;
import com.scudata.expression.FileFunction;
import com.scudata.expression.IParam;
import com.scudata.expression.Node;
import com.scudata.resources.AppMessage;
import com.scudata.resources.EngineMessage;

/**
 * ????f.xlsopen(p) ????Excel?ļ?f???سɶ??? p?????룻???ض??????Ϊֻ?????
 * stname??ҳ????,nrows????????,ncols????????
 * 
 * @r ??ʽ???????ڳ??򵼳???xls?п????????????ز???ȷ
 * @w ??ʽд????ʱ???ܷ?????????Ϣ????@r????
 * 
 *
 */
public class XlsOpen extends FileFunction {

	/**
	 * ????
	 */
	public Object calculate(Context ctx) {
		String opt = option;
		boolean isR = opt != null && opt.indexOf("r") > -1;
		boolean isW = opt != null && opt.indexOf("w") > -1;

		if (isR && isW) {
			// @w??@r????ss
			MessageManager mm = AppMessage.get();
			throw new RQException("xlsopen" + mm.getMessage("filexls.notrw")); // ??ѡ??w??r????ͬʱ????
		}

		if (param == null) {
			// ????Excel?ļ?????
			return xlsOpen(null, isR, isW, ctx);
		}

		String pwd = null;
		if (param.getType() != IParam.Normal) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("xlsopen"
					+ mm.getMessage("function.invalidParam"));
		} else {
			if (!param.isLeaf()) {
				MessageManager mm = EngineMessage.get();
				throw new RQException("xlsopen"
						+ mm.getMessage("function.invalidParam"));
			}

			IParam pwdParam = param;
			if (pwdParam != null) {
				Object tmp = pwdParam.getLeafExpression().calculate(ctx);
				if (tmp != null) {
					pwd = tmp.toString();
				}
				if ("".equals(pwd))
					pwd = null;
			}
		}
		try {
			return xlsOpen(pwd, isR, isW, ctx);
		} catch (RQException e) {
			throw e;
		} catch (Exception e) {
			throw new RQException(e.getMessage(), e);
		}
	}

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

		return this;
	}

	/**
	 * ????xo?ļ?????
	 * 
	 * @param pwd
	 *            ????
	 * @param isR
	 *            ѡ??@r
	 * @param isW
	 * @return
	 */
	private XlsFileObject xlsOpen(String pwd, boolean isR, boolean isW,
			Context ctx) {
		if (isR) {
			FileXlsR xo = new FileXlsR(file, pwd);
			ctx.addResource(xo);
			return xo;
		}
		byte type;
		if (isW) {
			type = XlsFileObject.TYPE_WRITE;
		} else {
			type = XlsFileObject.TYPE_NORMAL;
		}
		FileXls xo = new FileXls(file, pwd, type);
		ctx.addResource(xo);
		return xo;
	}

}