SIPRP/trunk/siprpWeb/src/com/evolute/siprp/pagina/NewsServlet.java

/*
 * NewsServlet.java
 *
 * Created on 20 de Maio de 2005, 17:48
 */

package com.evolute.siprp.pagina;

import java.io.IOException;
import java.io.StringWriter;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;

import com.evolute.utils.arrays.Virtual2DArray;
import com.evolute.utils.db.DBManager;
import com.evolute.utils.db.JDBCManager;
import com.evolute.utils.db.SQLExecuter;
import com.evolute.utils.sql.Field;
import com.evolute.utils.sql.SQLQuery;
import com.evolute.utils.sql.Select;
import com.evolute.utils.strings.StringConverter;

/**
 * 
 * @author lflores
 */
public class NewsServlet extends HttpServlet implements GlobalConstants
{
	private static final long serialVersionUID = 1L;

	private static DBManager DBM = null;

	private static final Select SELECT = new Select( new String[] { "not_noticias" }, new String[] { "data", "noticia" }, new Field( "id" ).in( new Field(
		"( SELECT MAX( id ) FROM not_noticias )" ) ) );

	private SQLExecuter executer = null;

	private static boolean velocityInit = false;

	public void init()
	{
		if ( !velocityInit )
		{
			try
			{
				String TEMPLATE_DIR = this.getServletContext().getRealPath( "/" ) + "html/";

				Properties props = new Properties();
				props.setProperty( "file.resource.loader.path", TEMPLATE_DIR );
				Velocity.init( props );
			}
			catch ( Exception ex )
			{
				ex.printStackTrace();
			}
			velocityInit = true;
		}

		if ( DBM != null )
		{
			return;
		}

		try
		{
			DBM = new JDBCManager( bdUrl + "?prepareThreshold=1", bdUsername, bdPassword, 8, 8, 0, new SQLQuery[] {} );
		}
		catch ( Exception e )
		{
			e.printStackTrace();
		}
	}

	private void close()
	{
		try
		{
			DBM.close();
			DBM = null;
		}
		catch ( Exception ex )
		{

		}
	}

	private String getNews()
	{
		try
		{
			if ( executer == null )
			{
				executer = ( SQLExecuter ) DBM.getSharedExecuter( this );
			}
			Virtual2DArray array = executer.executeQuery( SELECT );
			Object o[][] = array.getObjects();
			if ( o != null && o.length > 0 )
			{
				return StringConverter.unicodeToHTML( o[ 0 ][ 1 ].toString() );
			}
		}
		catch ( Exception ex )
		{
			ex.printStackTrace();
			close();
		}
		return null;
	}

	public void doGet( HttpServletRequest req, HttpServletResponse res ) throws IOException
	{
		init();
		ServletOutputStream out = res.getOutputStream();
		res.setContentType( "text/html" );
		String news = getNews();
		Map< String, Object > parameters = new HashMap< String, Object >();
		parameters.put( "noticias", news == null ? "" : news );
		out.println( showPage( "noticias/mostrar_noticias.html", parameters ) );
	}

	private String showPage( String page, Map< String, Object > parameters )
	{
		VelocityContext context = new VelocityContext();
		StringWriter output = new StringWriter();

		try
		{
			if ( parameters != null )
			{
				Iterator< String > it = parameters.keySet().iterator();
				while ( it.hasNext() )
				{
					String key = it.next();
					context.put( key, parameters.get( key ) );
				}
			}
			Velocity.mergeTemplate( page, Velocity.ENCODING_DEFAULT, context, output );

			return output.toString();
		}
		catch ( Exception e )
		{
			e.printStackTrace();
		}
		return null;
	}
}