cn.itcreator.android.reader.util.XMLUtil.java Source code

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Here is the source code for cn.itcreator.android.reader.util.XMLUtil.java

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/**
 * <For xml type file tools.>
 *  Copyright (C) <2009>  <Wang XinFeng,ACC http://androidos.cc/dev>
 *
 *   This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */
package cn.itcreator.android.reader.util;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

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

import cn.itcreator.android.reader.domain.BookMark;
import cn.itcreator.android.reader.paramter.Constant;

import android.util.Log;

/**
 * For xml type file tools
 * 
 * @author Wang XinFeng
 * @version 1.0
 * 
 */
public class XMLUtil {

    private String mFilePath;// xml file path
    private File mFile;
    private Document mDocument;// DOM 

    private String flagd = "";

    /**
     * 
     * @param filePath
     *             xml file path
     */
    public XMLUtil(String filePath) {
        this.mFilePath = filePath;
        mFile = new File(mFilePath);
        if (!mFile.exists()) {
            try {
                mFile.createNewFile();
                mDocument = DocumentHelper.createDocument();
                // create new xml document
            } catch (IOException e) {
                mDocument = DocumentHelper.createDocument();
            }
        } else {
            try {
                mDocument = new SAXReader().read(mFile);
            } catch (DocumentException e) {
                mDocument = DocumentHelper.createDocument();
            }
        }
        System.gc();
    }

    /**
     * save the list to a xml file
     * @param list the list u wanna save
     * @return
     */
    public boolean saveToFile(List<BookMark> list) {
        boolean result = true;
        Element root = null;
        root = mDocument.getRootElement();
        if (null == root) {
            root = mDocument.addElement("bookmark");
        }
        for (BookMark bookMark : list) {
            Element mark = root.addElement("mark");
            mark.addAttribute("markName", bookMark.getMarkName());
            mark.addAttribute("currentOffset", "" + bookMark.getCurrentOffset());
        }
        OutputFormat format = OutputFormat.createPrettyPrint();
        /** Give the xml file encode */
        format.setEncoding(Constant.UTF8);
        try {
            XMLWriter writer = new XMLWriter(new FileOutputStream(mFilePath), format);
            writer.write(mDocument);
            writer.close();
        } catch (IOException e) {
            result = false;
        }
        return result;
    }

    /**
     * the file parse to a list 
     * @return
     */
    public List<BookMark> fileToList() {
        List<BookMark> list = new ArrayList<BookMark>();
        List<Element> el = null;
        Element elt = mDocument.getRootElement();
        if (null != elt)
            el = elt.elements("mark");
        if (el != null) {
            Iterator<Element> l = el.iterator();
            while (l.hasNext()) {
                Element Element = (Element) l.next();
                int offset = 0;
                try {
                    offset = Integer.parseInt(Element.attributeValue("currentOffset"));
                } catch (Exception e) {
                    offset = 0;
                }
                BookMark b = new BookMark(offset, Element.attributeValue("markName"), Constant.BOOK_ID_IN_DATABASE);
                list.add(b);
            }
        }
        System.gc();
        return list;
    }

}