How to access private and protected JRElements members of JasperDesign object?

Question

I am creating Jasper object using JasperDesign class and initiating it using JRXmlLoader from jrxml file. I am extracting all the JRBands using getAllBands() method to get all JRBands and from each band, I am extracting JRElements using method getElements() of JRBand.

However, after getting each element like staticField or textField , I am not able to get their values from "TEXT" field which is private or protected.

How can I access these values?

Answer 1

You need to cast the JRElement to the relative JRDesign class to be able to access the specific attributes of the element:

• <textField> to JRDesignTextField
• <staticText> to JRDesignStaticText

Example

jrxml

<?xml version="1.0" encoding="UTF-8"?>
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="testJasperDesign" pageWidth="595" pageHeight="842" whenNoDataType="AllSectionsNoDetail" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="597c0716-df6b-42ec-a7c8-863eb1b7174a">
    <parameter name="testParam" class="java.lang.String">
        <defaultValueExpression><![CDATA["Hello world"]]></defaultValueExpression>
    </parameter>
    <variable name="variable1" class="java.lang.String"/>
    <title>
        <band height="32" splitType="Stretch">
            <textField>
                <reportElement x="100" y="0" width="100" height="20" uuid="bf5a8f35-3faf-457b-a6fc-b29d97a9c332"/>
                <textFieldExpression><![CDATA[$P{testParam}]]></textFieldExpression>
            </textField>
            <staticText>
                <reportElement x="0" y="0" width="100" height="20" uuid="59922664-93a3-4f69-a906-5ff418d09cd3"/>
                <text><![CDATA[Static text]]></text>
            </staticText>
        </band>
    </title>
</jasperReport>

Java

public static void main(String[] args) throws JRException {

    JasperDesign design = JRXmlLoader.load("jasper/testJasperDesign.jrxml");
    JRBand titleBand = design.getTitle();
    JRElement[] elements = titleBand.getElements();
    for (JRElement element : elements) {
        if (element instanceof JRDesignTextField){
            JRDesignTextField textField = (JRDesignTextField) element;
            JRExpression expression = textField.getExpression();
            System.out.println(expression.getText());
        }
        if (element instanceof JRDesignStaticText){
            JRDesignStaticText staticText = (JRDesignStaticText) element;
            System.out.println(staticText.getText());
        }

    }
}

Output

$P{testParam}
Static text