Generic conditional Styles - jasper-reports

Question

I have a need to create a style that would be applied to all "cells"/Element/object on a report.
is there a way to do this other than creating condition for each field/Variable ?
For a simple example using the code below I want to create a conditional style what would work for Col1..Col5 to test for 0 and make the background blue else leave it white. For this example I know creating 5 conditions is not the big of deal but I am dealing with 60 for my report.
<?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="report4a" language="groovy" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="fe23f2e2-ee8e-403b-b870-7785fe8941a6">
<queryString>
<![CDATA[select 1 as col1, 0 as col2, 2 as col3, 0 as col4, 10 as col5 from dual
union
select 4 as col1, 0 as col2, 7 as col3, 1 as col4, 12 as col5 from dual
union
select 5 as col1, 0 as col2, 8 as col3, 0 as col4, 16 as col5 from dual
union
select 0 as col1, 0 as col2, 0 as col3, 1 as col4, 110 as col5 from dual
union
select 7 as col1, 0 as col2, 7 as col3, 0 as col4, 180 as col5 from dual
union
select 0 as col1, 0 as col2, 0 as col3, 1 as col4, 107 as col5 from dual ]]>
</queryString>
<field name="COL1" class="java.math.BigDecimal"/>
<field name="COL2" class="java.math.BigDecimal"/>
<field name="COL3" class="java.math.BigDecimal"/>
<field name="COL4" class="java.math.BigDecimal"/>
<field name="COL5" class="java.math.BigDecimal"/>
<background>
<band splitType="Stretch"/>
</background>
<columnHeader>
<band height="20" splitType="Stretch">
<staticText>
<reportElement uuid="077997f5-c89c-4fdf-b89e-aa43b7cf77e3" x="0" y="0" width="111" height="20"/>
<textElement/>
<text><![CDATA[COL1]]></text>
</staticText>
<staticText>
<reportElement uuid="1421164b-ba30-4104-bf62-1e75dd04f757" x="111" y="0" width="111" height="20"/>
<textElement/>
<text><![CDATA[COL2]]></text>
</staticText>
<staticText>
<reportElement uuid="03802088-f5b9-4412-aae7-64ec6c54c4c3" x="222" y="0" width="111" height="20"/>
<textElement/>
<text><![CDATA[COL3]]></text>
</staticText>
<staticText>
<reportElement uuid="b44d853c-0ea5-49ea-8420-e4c40d65c3c3" x="333" y="0" width="111" height="20"/>
<textElement/>
<text><![CDATA[COL4]]></text>
</staticText>
<staticText>
<reportElement uuid="25534117-80fa-43ee-b90c-f150d4b8e0e0" x="444" y="0" width="111" height="20"/>
<textElement/>
<text><![CDATA[COL5]]></text>
</staticText>
</band>
</columnHeader>
<detail>
<band height="20" splitType="Stretch">
<textField>
<reportElement uuid="8cffe1bc-e06b-48ec-96fc-a3464687a883" x="0" y="0" width="111" height="20"/>
<textElement/>
<textFieldExpression><![CDATA[$F{COL1}]]></textFieldExpression>
</textField>
<textField>
<reportElement uuid="03ec79ef-9614-4929-b464-450b9b9e8a80" x="111" y="0" width="111" height="20"/>
<textElement/>
<textFieldExpression><![CDATA[$F{COL2}]]></textFieldExpression>
</textField>
<textField>
<reportElement uuid="79a5d64c-18b4-4a58-89c7-d72de8072759" x="222" y="0" width="111" height="20"/>
<textElement/>
<textFieldExpression><![CDATA[$F{COL3}]]></textFieldExpression>
</textField>
<textField>
<reportElement uuid="6a5606ff-0f1a-4dec-a494-90c493c794a0" x="333" y="0" width="111" height="20"/>
<textElement/>
<textFieldExpression><![CDATA[$F{COL4}]]></textFieldExpression>
</textField>
<textField>
<reportElement uuid="c2c5f7b1-4d70-49a8-8745-f9337d07457b" x="444" y="0" width="111" height="20"/>
<textElement/>
<textFieldExpression><![CDATA[$F{COL5}]]></textFieldExpression>
</textField>
</band>
</detail>
</jasperReport>

Answer 1

Yes, you can do it in this manner.
Step 1
For example we have a template:
<?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="styles_sample" language="groovy" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="fafb8cb9-d85f-40ad-a31b-0aabd9f6ba93">
<queryString>
<![CDATA[SELECT id, name, cost FROM product]]>
</queryString>
<field name="ID" class="java.lang.Integer"/>
<field name="NAME" class="java.lang.String"/>
<field name="COST" class="java.math.BigDecimal"/>
<title>
<band height="79" splitType="Stretch">
<staticText>
<reportElement uuid="4c746058-73f8-44b1-b8a4-b503291d4c23" x="54" y="22" width="446" height="35"/>
<textElement textAlignment="Center" verticalAlignment="Middle"/>
<text><![CDATA[Styles sample.
Without using the default style]]></text>
</staticText>
</band>
</title>
<columnHeader>
<band height="20">
<staticText>
<reportElement uuid="f91514a2-601f-4045-a294-68be1929c712" x="0" y="0" width="100" height="20"/>
<box leftPadding="10">
<topPen lineWidth="0.25"/>
<leftPen lineWidth="0.25"/>
<bottomPen lineWidth="0.25"/>
<rightPen lineWidth="0.25"/>
</box>
<textElement textAlignment="Center" verticalAlignment="Middle"/>
<text><![CDATA[ID]]></text>
</staticText>
<staticText>
<reportElement uuid="1efff9bb-0a2a-438d-9e7b-3d29f1d4c537" x="100" y="0" width="100" height="20"/>
<box leftPadding="10">
<topPen lineWidth="0.25"/>
<leftPen lineWidth="0.25"/>
<bottomPen lineWidth="0.25"/>
<rightPen lineWidth="0.25"/>
</box>
<textElement textAlignment="Center" verticalAlignment="Middle"/>
<text><![CDATA[Name]]></text>
</staticText>
<staticText>
<reportElement uuid="c061bcd5-9a9d-4ad6-89f4-a99103bdb742" x="200" y="0" width="100" height="20"/>
<box leftPadding="10">
<topPen lineWidth="0.25"/>
<leftPen lineWidth="0.25"/>
<bottomPen lineWidth="0.25"/>
<rightPen lineWidth="0.25"/>
</box>
<textElement textAlignment="Center" verticalAlignment="Middle"/>
<text><![CDATA[Cost]]></text>
</staticText>
</band>
</columnHeader>
<detail>
<band height="20" splitType="Stretch">
<textField>
<reportElement uuid="848d3bcf-4c06-4a8a-b880-e5cdae5749e2" x="0" y="0" width="100" height="20"/>
<box leftPadding="10">
<topPen lineWidth="0.25"/>
<leftPen lineWidth="0.25"/>
<bottomPen lineWidth="0.25"/>
<rightPen lineWidth="0.25"/>
</box>
<textElement/>
<textFieldExpression><![CDATA[$F{ID}]]></textFieldExpression>
</textField>
<textField>
<reportElement uuid="5557f5a7-4db6-4b58-a99f-b0ccf88c69c5" x="100" y="0" width="100" height="20"/>
<box leftPadding="10">
<topPen lineWidth="0.25"/>
<leftPen lineWidth="0.25"/>
<bottomPen lineWidth="0.25"/>
<rightPen lineWidth="0.25"/>
</box>
<textElement/>
<textFieldExpression><![CDATA[$F{NAME}]]></textFieldExpression>
</textField>
<textField>
<reportElement uuid="b77c6785-28d4-4395-b99c-2dbc336d00b3" x="200" y="0" width="100" height="20"/>
<box leftPadding="10">
<topPen lineWidth="0.25"/>
<leftPen lineWidth="0.25"/>
<bottomPen lineWidth="0.25"/>
<rightPen lineWidth="0.25"/>
</box>
<textElement/>
<textFieldExpression><![CDATA[$F{COST}]]></textFieldExpression>
</textField>
</band>
</detail>
</jasperReport>
The result will be (via preview in iReport):
Step 2
Now we are decide to add the default style (defStyle). For example we are changing the forecolor of all elements to blue color.
Our template in this case is:
<?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="styles_sample" language="groovy" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="fafb8cb9-d85f-40ad-a31b-0aabd9f6ba93">
<style name="defStyle" isDefault="true" forecolor="#3333FF"/>
<queryString>
<![CDATA[SELECT id, name, cost FROM product]]>
</queryString>
<field name="ID" class="java.lang.Integer"/>
<field name="NAME" class="java.lang.String"/>
<field name="COST" class="java.math.BigDecimal"/>
<title>
<band height="79" splitType="Stretch">
<staticText>
<reportElement uuid="4c746058-73f8-44b1-b8a4-b503291d4c23" x="54" y="22" width="446" height="35"/>
<textElement textAlignment="Center" verticalAlignment="Middle"/>
<text><![CDATA[Styles sample.
Using the default style]]></text>
</staticText>
</band>
</title>
<columnHeader>
<band height="20">
<staticText>
<reportElement uuid="f91514a2-601f-4045-a294-68be1929c712" x="0" y="0" width="100" height="20"/>
<box leftPadding="10">
<topPen lineWidth="0.25"/>
<leftPen lineWidth="0.25"/>
<bottomPen lineWidth="0.25"/>
<rightPen lineWidth="0.25"/>
</box>
<textElement textAlignment="Center" verticalAlignment="Middle"/>
<text><![CDATA[ID]]></text>
</staticText>
<staticText>
<reportElement uuid="1efff9bb-0a2a-438d-9e7b-3d29f1d4c537" x="100" y="0" width="100" height="20"/>
<box leftPadding="10">
<topPen lineWidth="0.25"/>
<leftPen lineWidth="0.25"/>
<bottomPen lineWidth="0.25"/>
<rightPen lineWidth="0.25"/>
</box>
<textElement textAlignment="Center" verticalAlignment="Middle"/>
<text><![CDATA[Name]]></text>
</staticText>
<staticText>
<reportElement uuid="c061bcd5-9a9d-4ad6-89f4-a99103bdb742" x="200" y="0" width="100" height="20"/>
<box leftPadding="10">
<topPen lineWidth="0.25"/>
<leftPen lineWidth="0.25"/>
<bottomPen lineWidth="0.25"/>
<rightPen lineWidth="0.25"/>
</box>
<textElement textAlignment="Center" verticalAlignment="Middle"/>
<text><![CDATA[Cost]]></text>
</staticText>
</band>
</columnHeader>
<detail>
<band height="20" splitType="Stretch">
<textField>
<reportElement uuid="848d3bcf-4c06-4a8a-b880-e5cdae5749e2" x="0" y="0" width="100" height="20"/>
<box leftPadding="10">
<topPen lineWidth="0.25"/>
<leftPen lineWidth="0.25"/>
<bottomPen lineWidth="0.25"/>
<rightPen lineWidth="0.25"/>
</box>
<textElement/>
<textFieldExpression><![CDATA[$F{ID}]]></textFieldExpression>
</textField>
<textField>
<reportElement uuid="5557f5a7-4db6-4b58-a99f-b0ccf88c69c5" x="100" y="0" width="100" height="20"/>
<box leftPadding="10">
<topPen lineWidth="0.25"/>
<leftPen lineWidth="0.25"/>
<bottomPen lineWidth="0.25"/>
<rightPen lineWidth="0.25"/>
</box>
<textElement/>
<textFieldExpression><![CDATA[$F{NAME}]]></textFieldExpression>
</textField>
<textField>
<reportElement uuid="b77c6785-28d4-4395-b99c-2dbc336d00b3" x="200" y="0" width="100" height="20"/>
<box leftPadding="10">
<topPen lineWidth="0.25"/>
<leftPen lineWidth="0.25"/>
<bottomPen lineWidth="0.25"/>
<rightPen lineWidth="0.25"/>
</box>
<textElement/>
<textFieldExpression><![CDATA[$F{COST}]]></textFieldExpression>
</textField>
</band>
</detail>
</jasperReport>
And the result will be (via preview in iReport):
The color is changed. Notes that we did not apply this style to any element (in the whole report's template).
Step 3
And now we want to add another conditional style (pink). We want to change the forecolor of the textField with cost value if the cost is bigger than 25 - we make it pink.
Our template in this case is:
<?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="styles_sample" language="groovy" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="fafb8cb9-d85f-40ad-a31b-0aabd9f6ba93">
<style name="defStyle" isDefault="true" forecolor="#3333FF"/>
<style name="pink" style="defStyle">
<conditionalStyle>
<conditionExpression><![CDATA[$F{COST} > 25]]></conditionExpression>
<style forecolor="#CC00CC"/>
</conditionalStyle>
</style>
<queryString>
<![CDATA[SELECT id, name, cost FROM product ORDER BY cost DESC]]>
</queryString>
<field name="ID" class="java.lang.Integer"/>
<field name="NAME" class="java.lang.String"/>
<field name="COST" class="java.math.BigDecimal"/>
<title>
<band height="79" splitType="Stretch">
<staticText>
<reportElement uuid="4c746058-73f8-44b1-b8a4-b503291d4c23" x="8" y="22" width="539" height="35"/>
<textElement textAlignment="Center" verticalAlignment="Middle" markup="html"/>
<text><![CDATA[Styles sample.
Using the default style and the another conditional style which applied to the <i>textField</i> with <b>cost</b> field]]></text>
</staticText>
</band>
</title>
<columnHeader>
<band height="20">
<staticText>
<reportElement uuid="f91514a2-601f-4045-a294-68be1929c712" x="0" y="0" width="100" height="20"/>
<box leftPadding="10">
<topPen lineWidth="0.25"/>
<leftPen lineWidth="0.25"/>
<bottomPen lineWidth="0.25"/>
<rightPen lineWidth="0.25"/>
</box>
<textElement textAlignment="Center" verticalAlignment="Middle"/>
<text><![CDATA[ID]]></text>
</staticText>
<staticText>
<reportElement uuid="1efff9bb-0a2a-438d-9e7b-3d29f1d4c537" x="100" y="0" width="100" height="20"/>
<box leftPadding="10">
<topPen lineWidth="0.25"/>
<leftPen lineWidth="0.25"/>
<bottomPen lineWidth="0.25"/>
<rightPen lineWidth="0.25"/>
</box>
<textElement textAlignment="Center" verticalAlignment="Middle"/>
<text><![CDATA[Name]]></text>
</staticText>
<staticText>
<reportElement uuid="c061bcd5-9a9d-4ad6-89f4-a99103bdb742" x="200" y="0" width="100" height="20"/>
<box leftPadding="10">
<topPen lineWidth="0.25"/>
<leftPen lineWidth="0.25"/>
<bottomPen lineWidth="0.25"/>
<rightPen lineWidth="0.25"/>
</box>
<textElement textAlignment="Center" verticalAlignment="Middle"/>
<text><![CDATA[Cost]]></text>
</staticText>
</band>
</columnHeader>
<detail>
<band height="20" splitType="Stretch">
<textField>
<reportElement uuid="848d3bcf-4c06-4a8a-b880-e5cdae5749e2" x="0" y="0" width="100" height="20"/>
<box leftPadding="10">
<topPen lineWidth="0.25"/>
<leftPen lineWidth="0.25"/>
<bottomPen lineWidth="0.25"/>
<rightPen lineWidth="0.25"/>
</box>
<textElement/>
<textFieldExpression><![CDATA[$F{ID}]]></textFieldExpression>
</textField>
<textField>
<reportElement uuid="5557f5a7-4db6-4b58-a99f-b0ccf88c69c5" x="100" y="0" width="100" height="20"/>
<box leftPadding="10">
<topPen lineWidth="0.25"/>
<leftPen lineWidth="0.25"/>
<bottomPen lineWidth="0.25"/>
<rightPen lineWidth="0.25"/>
</box>
<textElement/>
<textFieldExpression><![CDATA[$F{NAME}]]></textFieldExpression>
</textField>
<textField>
<reportElement uuid="b77c6785-28d4-4395-b99c-2dbc336d00b3" style="pink" x="200" y="0" width="100" height="20"/>
<box leftPadding="10">
<topPen lineWidth="0.25"/>
<leftPen lineWidth="0.25"/>
<bottomPen lineWidth="0.25"/>
<rightPen lineWidth="0.25"/>
</box>
<textElement/>
<textFieldExpression><![CDATA[$F{COST}]]></textFieldExpression>
</textField>
</band>
</detail>
</jasperReport>
We added the new style pink which is overrides the defStyle and we applied it to the textFiled in third column cost. We did not apply any other style to any other elements.
The result will be (via preview in iReport):
Note:
We can override the behavior of all styles with help of net.sf.jasperreports.style.{style_property_suffix} parameters.
More info about Conditional Styles
Don't forget about the net.sf.jasperreports.style.evaluation.time.enabled property.