xml.cart
Class CartDocumentHandler

java.lang.Object
  org.xml.sax.helpers.DefaultHandler
      xml.cart.CartDocumentHandler

All Implemented Interfaces:

org.xml.sax.ContentHandler, org.xml.sax.DTDHandler, org.xml.sax.EntityResolver, org.xml.sax.ErrorHandler

public class CartDocumentHandler
extends org.xml.sax.helpers.DefaultHandler

The CartDocumentHandler gets notification in the form of a call-back method. These call-backs are like the Listener model used for event handling. When a new element is encountered, for example, that creates a call-back. The call-backs are handled in the DocumentHandler:

Constructor Summary

CartDocumentHandler()

Method Summary

void	addProduct() addProduct will make an instance of a Product class and add it to the Cart instance.
void	characters(char[] buf, int offset, int len) when characters are found, we add them to the string vector for latter use.
void	endDocument()
void	endElement(java.lang.String URI, java.lang.String localName, java.lang.String qName) When we get the tag, then we want to invoke addProduct otherwise, just return:
Cart	getCart()
void	ignorableWhitespace(char[] buf, int offset, int len)
void	processingInstruction(java.lang.String target, java.lang.String data) The processingInstruction is called back when a non XML declaration is made.
void	setDocumentLocator(org.xml.sax.Locator l) The Locator instance must be used locally to identify the origin of a SAX event.
void	startDocument()
void	startElement() The AttributeList is not going to have any attributes in it for our example (i.e.

Methods inherited from class org.xml.sax.helpers.DefaultHandler

endPrefixMapping, error, fatalError, notationDecl, resolveEntity, skippedEntity, startElement, startPrefixMapping, unparsedEntityDecl, warning

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CartDocumentHandler

public CartDocumentHandler()

Method Detail

getCart

public Cart getCart()

setDocumentLocator

public void setDocumentLocator(org.xml.sax.Locator l)

The Locator instance must be used locally to identify the origin of a SAX event.

Specified by:

setDocumentLocator in interface org.xml.sax.ContentHandler

Overrides:

setDocumentLocator in class org.xml.sax.helpers.DefaultHandler

startDocument

public void startDocument()
                   throws org.xml.sax.SAXException

Specified by:

startDocument in interface org.xml.sax.ContentHandler

Overrides:

startDocument in class org.xml.sax.helpers.DefaultHandler

Throws:

org.xml.sax.SAXException

endDocument

public void endDocument()
                 throws org.xml.sax.SAXException

Specified by:

endDocument in interface org.xml.sax.ContentHandler

Overrides:

endDocument in class org.xml.sax.helpers.DefaultHandler

Throws:

org.xml.sax.SAXException

startElement

public void startElement()

The AttributeList is not going to have any attributes in it for our example (i.e. provides an attribute of isbn whose value is 10).

endElement

public void endElement(java.lang.String URI,
                       java.lang.String localName,
                       java.lang.String qName)

When we get the tag, then we want to invoke addProduct otherwise, just return:

Specified by:

endElement in interface org.xml.sax.ContentHandler

Overrides:

endElement in class org.xml.sax.helpers.DefaultHandler

addProduct

public void addProduct()

addProduct will make an instance of a Product class and add it to the Cart instance. It is added by parsing the last three strings that have been pushed into the StringVector.

characters

public void characters(char[] buf,
                       int offset,
                       int len)

when characters are found, we add them to the string vector for latter use.

Specified by:

characters in interface org.xml.sax.ContentHandler

Overrides:

characters in class org.xml.sax.helpers.DefaultHandler

ignorableWhitespace

public void ignorableWhitespace(char[] buf,
                                int offset,
                                int len)

Specified by:

ignorableWhitespace in interface org.xml.sax.ContentHandler

Overrides:

ignorableWhitespace in class org.xml.sax.helpers.DefaultHandler

processingInstruction

public void processingInstruction(java.lang.String target,
                                  java.lang.String data)

The processingInstruction is called back when a non XML declaration is made.

Specified by:

processingInstruction in interface org.xml.sax.ContentHandler

Overrides:

processingInstruction in class org.xml.sax.helpers.DefaultHandler