javaapplication3.DataXmlWorker.java Source code

Introduction

Here is the source code for javaapplication3.DataXmlWorker.java

Source

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package javaapplication3;

import java.util.Iterator;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.ShortBuffer;
import org.dom4j.Element;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author blobby
 */
public class DataXmlWorker {

    // FUNCTIONS

    public void setFileParams(String file_name_from_unit, String file_name_to_unit, int check_period,
            int mem_shift) {
        file_name_from_unit_ = file_name_from_unit;
        file_name_to_unit_ = file_name_to_unit;
        check_period_ = check_period;
        mem_shift_ = mem_shift;
        last_change_timestamp_ = getChangeTimeStamp();

        //System.out.println("getChangeTimeStamp() = " + last_change_timestamp_);
    }

    public ShortBuffer upDateData(ShortBuffer mem_data) {

        if (last_change_timestamp_ != getChangeTimeStamp()) {
            //System.out.println("some new data in XML");
            ShortBuffer cur_data = getXmlData(mem_data);
            setXmlData(mem_data);
            last_change_timestamp_ = getChangeTimeStamp();
            return cur_data;
        }

        if ((System.currentTimeMillis() - last_change_timestamp_) < check_period_) {
            //System.out.println("NO upDateData: " + (System.currentTimeMillis() - last_change_timestamp_));
            return mem_data;
        }

        //System.out.println("in upDateData");
        //System.out.println("No new data in XML");
        setXmlData(mem_data);
        last_change_timestamp_ = getChangeTimeStamp();
        return mem_data;
    }

    private ShortBuffer getXmlData(ShortBuffer mem_data) {

        ShortBuffer exitData = ShortBuffer.allocate(mem_data.limit());
        exitData.put(mem_data.array());

        SAXReader reader = new SAXReader();

        File f = new File(file_name_to_unit_);

        if (!f.exists()) {
            System.out.println("no data file " + file_name_to_unit_);
        }

        try {
            Document document = reader.read(f);

            Element root = document.getRootElement().element("map");

            // iterate through child elements of root
            for (Iterator i = root.elementIterator(); i.hasNext();) {
                Element element = (Element) i.next();

                //System.out.println("addr[ " + element.attributeValue("addr") + "] = " + element.attributeValue("value"));

                // TODO put +2 into config
                int mem_adr = Integer.parseInt(element.attributeValue("addr")) - mem_shift_ + 2; // DEBUG +2 for fix webface bug
                if (mem_adr < mem_data.limit())
                    exitData.put(mem_adr, (short) Integer.parseInt(element.attributeValue("value")));
            }

            return exitData;
        } catch (DocumentException ex) {
            System.out.println("Exeption: " + ex.getMessage());
            Logger.getLogger(DataXmlWorker.class.getName()).log(Level.SEVERE, null, ex);
        }

        return exitData;
    }

    private void setXmlData(ShortBuffer mem_data) {
        SAXReader reader = new SAXReader();

        File f = new File(file_name_from_unit_);

        if (!f.exists()) {
            System.out.println("no data file " + file_name_from_unit_);
        }

        try {
            Document document = reader.read(f);

            Element root = document.getRootElement().element("map");

            // iterate through child elements of root
            for (Iterator i = root.elementIterator(); i.hasNext();) {
                Element element = (Element) i.next();

                //System.out.println("addr[ " + element.attributeValue("addr") + "] = " + element.attributeValue("value"));

                int mem_adr = Integer.parseInt(element.attributeValue("addr")) - mem_shift_;
                //System.out.println("mem_adr = " + mem_adr);

                if (mem_adr < mem_data.limit()) {
                    int data = mem_data.get(mem_adr);
                    if (data < 0)
                        data += 65536;
                    //System.out.println("in put attr to xml int = " + data);
                    element.attribute("value").setValue(Integer.toString(data));
                }
            }

            //            XMLWriter writer = new XMLWriter( new FileWriter( "output.xml" ));
            XMLWriter writer = new XMLWriter(new FileWriter(file_name_from_unit_));
            writer.write(document);
            writer.close();

        } catch (DocumentException ex) {
            System.out.println("Exeption: " + ex.getMessage());
            Logger.getLogger(DataXmlWorker.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            System.out.println("Exeption: " + ex.getMessage());
            Logger.getLogger(DataXmlWorker.class.getName()).log(Level.SEVERE, null, ex);
        }

    }

    private long getChangeTimeStamp() {
        return new File(file_name_to_unit_).lastModified();
    }

    // FIELDS
    private String file_name_from_unit_;
    private String file_name_to_unit_;
    private int check_period_;
    private long last_change_timestamp_;
    private int mem_shift_;

}