com.pureinfo.dolphin.export.impl.XmlExporterImpl.java Source code

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Here is the source code for com.pureinfo.dolphin.export.impl.XmlExporterImpl.java

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/**
 * PureInfo Dolphin
 * @(#)XmlExporterImpl.java   1.0 Sep 29, 2005
 * 
 * Copyright(c) 2004-2005, PureInfo Information Technology Corp. Ltd. 
 * All rights reserved, see the license file.
 * 
 * www.pureinfo.com.cn
 */

package com.pureinfo.dolphin.export.impl;

import java.io.OutputStream;
import java.util.Calendar;
import java.util.Date;
import java.util.Iterator;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;

import com.pureinfo.dolphin.export.IExporter;
import com.pureinfo.dolphin.export.model.DolphinExportGoods;
import com.pureinfo.dolphin.export.model.IExportGoods;
import com.pureinfo.force.ForceConstants;
import com.pureinfo.force.exception.PureException;
import com.pureinfo.force.exception.PureRuntimeException;

/**
 * <P>
 * Created on Sep 29, 2005 3:38:55 PM <BR>
 * Last modified on Sep 29, 2005
 * </P>
 * 
 * @author Freeman.Hu
 * @version 1.0, Sep 29, 2005
 * @since Dolphin 1.0
 */
public class XmlExporterImpl implements IExporter {

    /**
     * @see com.pureinfo.dolphin.export.IExporter#export(OutputStream,
     *      DolphinExportGoods)
     */
    public void export(OutputStream _os, IExportGoods _goods) throws PureException {
        try {
            //1. to create XML element
            Document doc = DocumentHelper.createDocument();
            Element root = doc.addElement(_goods.getName());

            //2. to prepare column names
            if (!_goods.hasHeader()) {
                throw new PureRuntimeException(PureException.SETTING_MISSING, "headers required in goods");
            }
            String[] colNames = _goods.getHeaders();

            //3. to export data
            Object[] values;
            Iterator iter = _goods.iterator();
            while (iter.hasNext()) {
                values = _goods.unpackGoods(iter.next());
                exportRow(root, values, colNames);
            }

            //4. to output to stream
            new XMLWriter(_os, OutputFormat.createPrettyPrint()).write(doc);
        } catch (Exception ex) {
            throw new PureException(PureException.UNKNOWN, "", ex);
        }
    }

    /**
     * Exports one row to XML
     * 
     * @param _parent
     *            parent element
     * @param _colValues
     *            column values
     * @param _colNames
     *            column names
     * @throws Exception
     *             if failed.
     */
    public static void exportRow(Element _parent, Object[] _colValues, String[] _colNames) throws Exception {
        Object value;
        String sValue;

        Element rowEle, colEle;
        rowEle = _parent.addElement("row");
        for (int i = 0; i < _colValues.length; i++) {
            colEle = rowEle.addElement(_colNames[i]);
            value = _colValues[i];
            if (value == null)
                continue;

            //else
            if (value instanceof Date) {
                sValue = ForceConstants.DATE_FORMAT.format((Date) value);
            } else if (value instanceof Calendar) {
                sValue = ForceConstants.DATE_FORMAT.format(((Calendar) value).getTime());
            } else {
                sValue = value.toString();
            }
            colEle.addText(sValue);
        }
    }
}