package com.google.buzz.parser.handler;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import com.google.buzz.model.BuzzCommentsFeed;
/**
* Handler for xml element: <b>Comments</b>
*
* @author roberto.estivill
*/
public class CommentsFeedHandler
extends BaseHandler
{
/**
* XML elements handled by this handler
*/
private static final String LINK = "link";
private static final String TITLE = "title";
private static final String TYPE = "type";
private static final String ID = "id";
private static final String GENERATOR = "generator";
private static final String GENERATOR_URI = "uri";
private static final String ENTRY = "entry";
/**
* Position flags
*/
private boolean insideTitle = false;
private boolean insideId = false;
private boolean insideGenerator = false;
/**
* Children handlers
*/
private LinkHandler linkHandler;
private CommentHandler commentHandler;
/**
* Object to return
*/
private BuzzCommentsFeed commentsFeed;
/**
* Constructor method to create a root handler.
*
* @param parentHandler handler
*/
public CommentsFeedHandler( XMLReader xmlReader )
{
super( xmlReader );
commentsFeed = new BuzzCommentsFeed();
}
/**
* Constructor method to create a child handler.
*
* @param parentHandler handler
*/
public CommentsFeedHandler( BaseHandler aParent )
{
super( aParent );
commentsFeed = new BuzzCommentsFeed();
}
/**
* @return the created feed object
*/
public BuzzCommentsFeed getFeed()
{
return commentsFeed;
}
/**
* Method to be called every time an xml element starts
*/
public void startElement( String uri, String name, String qName, Attributes attributes )
throws SAXException
{
if ( LINK.equals( name ) )
{
linkHandler = new LinkHandler( this );
linkHandler.startHandlingEvents();
linkHandler.startElement( uri, name, qName, attributes );
}
else if ( TITLE.equals( name ) )
{
String titleType = attributes.getValue( TYPE );
if ( titleType != null && !titleType.equals( "" ) )
{
commentsFeed.setTitleType( titleType );
}
insideTitle = true;
}
else if ( ID.equals( name ) )
{
insideId = true;
}
else if ( GENERATOR.equals( name ) )
{
insideGenerator = true;
String generatorUri = attributes.getValue( GENERATOR_URI );
if ( generatorUri != null && !generatorUri.equals( "" ) )
{
commentsFeed.setGeneratorUri( generatorUri );
}
}
else if ( ENTRY.equals( name ) )
{
commentHandler = new CommentHandler( this );
commentHandler.startHandlingEvents();
commentHandler.startElement( uri, name, qName, attributes );
}
}
/**
* Method to be called every time an xml element ends
*/
public void endElement( String uri, String name, String qName )
throws SAXException
{
if ( LINK.equals( name ) )
{
commentsFeed.getLinks().add( linkHandler.getBuzzLink() );
}
else if ( TITLE.equals( name ) )
{
insideTitle = false;
}
else if ( ID.equals( name ) )
{
insideId = false;
}
else if ( GENERATOR.equals( name ) )
{
insideGenerator = false;
}
else if ( ENTRY.equals( name ) )
{
commentsFeed.getComments().add( commentHandler.getBuzzComment() );
}
}
/**
* Method to be called between the beginning and the end of the xml elements.
*/
public void characters( char[] ch, int start, int length )
throws SAXException
{
String content = ( new String( ch ).substring( start, start + length ) );
if ( insideTitle )
{
commentsFeed.setTitle( content );
}
else if ( insideId )
{
commentsFeed.setId( content );
}
else if ( insideGenerator )
{
commentsFeed.setGenerator( content );
}
}
}