Hey, that code was cool and worked great for me but I'm a n00b at Java and couldn't change it to fit this program I'm trying to get to work.
I got all this code from a book and it doesn't work right. When I run the application file it gives me a stack trace bser. Did I do something wrong in the code or what? Oh and btw, yes there are other files associated with this but didn't want to list ALL the code since I figure the error's in here.
import java.util.*;
import java.io.*;
import javax.xml.stream.*; //StAX API
//mine!
public class ProductXMLFile implements ProductDAO
{
private String productsFilename = "products.xml";
private File productsFile = null;
public ProductXMLFile()
{
productsFile = new File(productsFilename);
}
private void checkFile() throws IOException
{
//if the file doesn't exist, create it
if(!productsFile.exists())
productsFile.createNewFile();
}
private boolean saveProducts(ArrayList<Product> products)
{
//creates the XMLOutputFactory object
XMLOutputFactory outputFactory = XMLOutputFactory.newInstance();
try
{
//check the file to make sure it exists
this.checkFile();
//creates XMLStreamWriter object
FileWriter fileWriter = new FileWriter(productsFilename);
XMLStreamWriter writer = outputFactory.createXMLStreamWriter(fileWriter);
//write the products to the file
/*writer.writeStartDocument("1.0");
writer.writeStartElement("Products");
for (Product p : products)
{
writer.writeStartElement("Product");
writer.writeAttribute("Code", p.getCode());
writer.writeStartElement("Description");
writer.writeCharacters(p.getDescription());
writer.writeEndElement();
writer.writeStartElement("Price");
double price = p.getPrice();
writer.writeCharacters(Double.toString(price));
writer.writeEndElement();
writer.writeEndElement();
}
writer.writeEndElement();
writer.flush();
writer.close();
}
catch(IOException e)
{
e.printStackTrace();
return false;
}
catch(XMLStreamException e)
{
e.printStackTrace();
return false;
}
return true;*/
}
public ArrayList<Product> getProducts()
{
ArrayList<Product> products = new ArrayList<Product>();
Product p = null;
//creates the XMLInputFactory object
/*XMLInputFactory inputFactory = XMLInputFactory.newInstance();
try
{
//check the file to make sure it exists
this.checkFile();
//creates a XMLStreamReader object
FileReader fileReader = new FileReader(productsFilename);
XMLStreamReader reader = inputFactory.createXMLStreamReader(fileReader);
//read the products from the file
while(reader.hasNext())
{
int eventType = reader.getEventType();
switch(eventType)
{
case XMLStreamConstants.START_ELEMENT:
String elementName = reader.getLocalName();
if(elementName.equals("Products"))
{
p = new Product();
String code = reader.getAttributeValue(0);
p.setCode(code);
}
if(elementName.equals("Description"))
{
String description = reader.getElementText();
p.setDescription(description);
}
if(elementName.equals("Price"))
{
String priceString = reader.getElementText();
double price = Double.parseDouble(priceString);
p.setPrice(price);
}
break;
case XMLStreamConstants.END_ELEMENT:
elementName = reader.getLocalName();
if(elementName.equals("Product"))
{
products.add(p);
}
break;
default:
break;
}
reader.next();
}*/
}
catch (IOException e)
{
e.printStackTrace();
return null;
}
catch(XMLStreamException e)
{
e.printStackTrace();
return null;
}
return products;
}
public Product getProduct(String code)
{
ArrayList<Product> products = this.getProducts();
for (Product p : products)
{
if (p.getCode().equals(code))
return p;
}
return null;
}
public boolean deleteProduct(Product p)
{
ArrayList<Product> products = this.getProducts();
products.remove(p);
return this.saveProducts(products);
}
public boolean addProduct(Product p)
{
ArrayList<Product> products = this.getProducts();
products.add(p);
return this.saveProducts(products);
}
public boolean updateProduct(Product newProduct)
{
ArrayList<Product> products = this.getProducts();
//get the old product and remove it
Product oldProduct = this.getProduct(newProduct.getCode());
int i = products.indexOf(oldProduct);
products.remove(i);
//add the updated product
products.add(i, newProduct);
return this.saveProducts(products);
}
}