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Contribution: XML Datasource


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By: Eric Everman - eeverman

Contribution: XML Datasource

2003-04-01 14:17

Hi-

 

I would like to contribute an xml datasource wrapper that I have been using. It wraps an xml DOM Element as the datasource and supports accessing elements and attributes via paths. It also supports default values and subtrees for subreports.

 

How should I go about getting it to you?

 

Thanks,

 

Eric Everman

 

 

 

 

By: Alvaro Badia Tejedor - albate

RE: Contribution: XML Datasource

2003-04-08 00:39

Hello,

I would like to follow with the project, but now in I am

busy with other things. Nevertheless this is the code that I

made:

###################################################

 

package dori.jasper.engine.data;

 

import dori.jasper.engine.JRDataSource;

import dori.jasper.engine.JRException;

import dori.jasper.engine.JRField;

import java.util.*;

import org.jdom.*;

import jasperreport.XmlContainer;

 

 

/**

* <p>Tí´µlo: JasperReport</p>

* <p>Descripció®ºGeneracion de Informes</p>

* <p>Copyright: Copyright © 2003</p>

* <p>Empresa: </p>

* @author Alvaro Badia

* @version 1.0

*/

 

public class JRXMLDataSource implements JRDataSource {

 

private Collection data = null;

private Iterator iterator = null;

private Element currentElement = null;

private Element previousElement = null;

private Element raiz_xml = null;

private boolean haysiguiente = true;

 

 

/**

* Constructor que recibe como argumento el nodo raíºde un

* fichero XML

*/

public JRXMLDataSource(Element xmlRootElement) {

 

this.raiz_xml = xmlRootElement;

this.data = xmlRootElement.getChildren();

this.haysiguiente=true;

if (this.data != null){

this.iterator = this.data.iterator();

}

 

}

/**

* Constructor que recibe como argumento la ruta del fichero

XML

*

*/

public JRXMLDataSource(String nombreFichero) {

Element xmlRootElement = null;

XmlContainer accXML = new XmlContainer();

accXML.abrirFicheroXml(nombreFichero);

xmlRootElement= accXML.getRaiz();

new JRXMLDataSource(xmlRootElement);

}

 

 

/**

*

*/

public boolean next() throws JRException {

boolean hasNext = false;

 

if (this.iterator != null) {

hasNext = this.iterator.hasNext();

if (hasNext) {

this.currentElement = (Element)this.iterator.next();

}

}

if (this.previousElement != null) {

if ( (this.previousElement.getName().equals

(this.currentElement.getName())) != true) {

this.haysiguiente = false;

}

}

 

return hasNext && this.haysiguiente;

 

}

 

/**

* NOTA:

* Los nombre de los elementos deben de ser de la

siguiente Forma:

* nodoPadre_nodoHijo_ ... ( y asi sucesivamente hasta la

profundidad del nodo

* de la cual queramos el texto).

* ejemplo :

*

* libros.xml:

* <libros>

* <libro>

* <autor>Gabriel Garcia Marquez</autor>

* <titulo>El coronel no tiene quien

le escriba</titulo>

* </libro>

* </libros>

* Nombre del campo 'autor':

* jrField.name= libro_autor

*/

public Object getFieldValue(JRField jrField) throws

JRException{

Object value = null;

 

if (currentElement != null){

//comprobamos los nivele que tiene el nodo que estamos

llamando

//esto lo hacemos buscando los '_' .

Vector campos = separarNombre(jrField.getName());

// itero sobre el vector de campos para llegar al nodo y

devolver el valor

Element nodoFinal=null;

if (campos.size() == 1){

if (currentElement.getParent().getChild(jrField.getName

()) == null)

value="";

else

value = currentElement.getParent().getChild

(jrField.getName()).getText();

this.previousElement=currentElement;

}else{

for (int i = 0; i < campos.size(); i++) {

nodoFinal = currentElement.getChild( (String)

campos.get(i));

}

if (nodoFinal == null)

value="";

else

value = nodoFinal.getText();

this.previousElement=currentElement;

}

}

 

return value;

}

/**

* M鴯do que pasᮤole como argumento una cadena con

* el carᣴer '_' devuelve un Vector con las palabras

separadas por el carᣴer.

*

*/

private Vector separarNombre(String cadena) {

Vector campos = new Vector();

int inicio = 0;

int fin = 0;

int indice = cadena.indexOf("_");

while (indice != ( -1)) {

fin = indice;

campos.add(cadena.substring(inicio, fin).trim());

cadena = cadena.substring(fin + 1);

indice = cadena.indexOf("_");

};

campos.add(cadena.trim());

return campos;

}

 

}

 

###################################################

 

This code does not work well absolutely. But if that fills up

report with the data of the XML-file.

 

If you like conntact with me , my mail is alvaroBT@ono.com.

And it will clarify to you what can.

 

Thanks you,

Alvaro Badia.

 

p.d. I'd like to participate in the project, but I have very much work. Sorry.

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