Custom DataSource

[aronrodrigues]

Hi. I'm a really new user of Jasper + iReport and I'm having some troubles because I don´t have a JDBC source. We here use XML files that are loaded in Objects. I need to make a graph with those objects data.
Here is my custom data source:
 

Code:

package report;import java.util.HashMap;import java.util.Iterator;import java.util.Map;import net.sf.jasperreports.engine.JRDataSource;import net.sf.jasperreports.engine.JRException;import net.sf.jasperreports.engine.JRField;public class CustomJRDataSource implements JRDataSource { private Map data; private Iterator keyIterator; private String key; public CustomJRDataSource() { this.data = new HashMap(); this.data.put("200600501", new Double(1.1230)); this.data.put("200600603", new Double(2.1234)); this.data.put("200600706", new Double(3.1241)); this.data.put("200600801", new Double(1)); this.keyIterator = data.keySet().iterator(); } public boolean next() throws JRException { boolean result = false; if (this.keyIterator.hasNext()) { this.key = this.keyIterator.next(); result = true; } else { this.key = null; } return result; } public Object getFieldValue(JRField arg0) throws JRException { Object result = null; if ("KEY".equals(arg0.getName())) { result = this.key; } else { result = this.data.get(this.key).toString(); } return result; }},>,>[/code]

this datasource in my java program fills the report and the list of numbers works. But in the iReport, returns null and a ClassCastException because it can´t cast from null.

I need to make a graph with one line with the values in that data source. All documentation and samples that I found uses jdbc. Can anyone helpme?

[aronrodrigues]

Why no one help me?

 

Is that question too hard?