Problem passing variables using XML........

Sorry, misinterpreted your question. I was thinking that you were just overwriting the previous XML file and couldn't get the old data to show up.

Sounds to me that the easiest way to check if there is an existing year/month/date would be to iterate through each line and check if the string contains the year/month/date of the new entry.

Message was edited by:

tk393

tk393a at 2007-7-12 17:27:33 >

A little bit more info.....

I have an example of an application which writes to an XML file, which I am using as a guide. I will post it here as it uses pretty much the same methods as my application, and the if(node.getNodeName().equals("Year")

&& Integer.valueOf(node.getAttributes().item(0).getNodeValue())==year)

code executes in this application. Why does it execute in this application, but not mine I wonder?

Here it is:

import javax.xml.parsers.*;

import org.xml.sax.*;

import java.io.*;

import java.util.*;

import org.w3c.dom.*;

import javax.xml.transform.*;

import javax.xml.transform.dom.*;

import javax.xml.transform.stream.*;

public class CallDOM

{

Document doc;

File file;

Scanner input;

int year, month, day;

String currentYear, currentMonth;

public static void main(String args[]) throws Exception

{

CallDOM cd=new CallDOM();

}

CallDOM() throws Exception

{

file=new File("Diary.xml");

//create DOM from file

doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(file.toURL().toString());

input=new Scanner(System.in);

System.out.println("1) Create entry");

System.out.println("2) Read entry");

System.out.println("3) Show Diary");

System.out.println("4) Quit");

int choice=input.nextInt();

while(choice!=4)

{

switch(choice)

{

case 1: GetDate();CreateEntry(doc.getDocumentElement());break;

case 2: GetDate();ReadEntry(doc.getDocumentElement());break;

case 3: ShowDiary(doc.getDocumentElement());

}

System.out.println("1) Create entry");

System.out.println("2) Read entry");

System.out.println("3) Show Diary");

System.out.println("4) Quit");

choice=input.nextInt();

}

writeXmlFile();

}

public void GetDate()

{

System.out.println("Enter date (dd mm yyyy)");

day=input.nextInt();

month=input.nextInt();

year=input.nextInt();

}

public boolean ReadEntry(Node node)

{

node = getYear(node);

if(node==null) return false;

node = getMonth(node);

if(node==null) return false;

node = getDay(node);

if(node==null) return false;

node = node.getFirstChild();

while(node!=null)

{

System.out.println(node.getNodeValue().trim());

node=node.getNextSibling();

}

return true;

}

public boolean CreateEntry(Node node)

{

Node searchNode;

searchNode = getYear(node);

if(searchNode==null)

{

Element newNode = doc.createElement("Year");

searchNode = node.appendChild(newNode);

newNode.setAttribute("Id",Integer.toString(year));

}

node = searchNode;

searchNode = getMonth(node);

if(searchNode==null)

{

Element newNode = doc.createElement("Month");

searchNode = node.appendChild(newNode);

newNode.setAttribute("Id",Integer.toString(month));

}

node = searchNode;

searchNode = getDay(node);

if(searchNode==null)

{

Element newNode = doc.createElement("Day");

searchNode = node.appendChild(newNode);

newNode.setAttribute("Id",Integer.toString(day));

}

node = searchNode;

System.out.println("Enter Text");

String entry=input.next();

entry+=input.nextLine();

Node textNode = doc.createTextNode(entry);

node.appendChild(textNode);

return true;

}

public void ShowDiary(Node node)

{

Stack<Node> stack=new Stack<Node>();

Node child;

stack.push(node);

while(!stack.empty())

{

node = stack.pop();

if(ProcessNode(node))

{

child = node.getLastChild();

while(child!=null)

{

stack.push(child);

child = child.getPreviousSibling();

}

}

}

}

private boolean ProcessNode(Node node)

{

if(node.getNodeName().equals("Year"))

currentYear=node.getAttributes().item(0).getNodeValue();

if(node.getNodeName().equals("Month"))

currentMonth=node.getAttributes().item(0).getNodeValue();

if(node.getNodeName().equals("Day"))

{

System.out.print(node.getAttributes().item(0).getNodeValue()+"/"+

currentMonth+"/"+currentYear+": ");

node=node.getFirstChild();

while(node!=null)

{

System.out.println(node.getNodeValue().trim());

node=node.getNextSibling();

}

return false;

}

return true;

}

private Node getYear(Node node)

{

node=node.getFirstChild();

while(node!=null)

{

if(node.getNodeName().equals("Year")

&& Integer.valueOf(node.getAttributes().item(0).getNodeValue())==year)

return node;

node = node.getNextSibling();

}

return null;

}

private Node getMonth(Node node)

{

node=node.getFirstChild();

while(node!=null)

{

if(node.getNodeName().equals("Month")

&& Integer.valueOf(node.getAttributes().item(0).getNodeValue())==month)

return node;

node = node.getNextSibling();

}

return null;

}

private Node getDay(Node node)

{

node=node.getFirstChild();

while(node!=null)

{

if(node.getNodeName().equals("Day")

&& Integer.valueOf(node.getAttributes().item(0).getNodeValue())==day)

return node;

node = node.getNextSibling();

}

return null;

}

private void writeXmlFile() throws Exception

{

Source source = new DOMSource(doc);

Result result = new StreamResult(file);

Transformer xformer = TransformerFactory.newInstance().newTransformer();

xformer.setOutputProperty(OutputKeys.INDENT,"yes");

xformer.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM,"Diary.dtd");

xformer.transform(source, result);

}

}

Thanks for any help at all!!!!!

Redstaara at 2007-7-12 17:27:33 >

Thanks for your suggestion mate. To be honest, I didn't realise that the '==' would not be effective in this instance.

However, I dont fully understand the syntax of what you are trying to explain to me. Would you be able to type it out in code for me? It'll just make more sense to me then!

I hope you are correct, as I would be very grateful due to this problem baffling me for two days now.

Cheers.

Redstaara at 2007-7-12 17:27:33 >