public class ValueStackDataSource extends Object implements net.sf.jasperreports.engine.JRRewindableDataSource
Constructor and Description |
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ValueStackDataSource(ValueStack valueStack,
String dataSourceParam,
boolean wrapField)
Create a value stack data source on the given iterable property
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Modifier and Type | Method and Description |
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Object |
getFieldValue(net.sf.jasperreports.engine.JRField field)
Get the value of a given field
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void |
moveFirst()
Move to the first item.
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boolean |
next()
Is there any more data
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public ValueStackDataSource(ValueStack valueStack, String dataSourceParam, boolean wrapField)
valueStack
- The value stack to base the data source ondataSourceParam
- The property to iterate over for the reportpublic Object getFieldValue(net.sf.jasperreports.engine.JRField field) throws net.sf.jasperreports.engine.JRException
getFieldValue
in interface net.sf.jasperreports.engine.JRDataSource
field
- The field to get the value for. The expression language to get the value
of the field is either taken from the description property or from the name of the field
if the description is null
.Object
containing the field value or a new
ValueStackDataSource
object if the field value evaluates to
an object that can be iterated over.net.sf.jasperreports.engine.JRException
- if there is a problem obtaining the valuepublic void moveFirst() throws net.sf.jasperreports.engine.JRException
moveFirst
in interface net.sf.jasperreports.engine.JRRewindableDataSource
net.sf.jasperreports.engine.JRException
- if there is a problem with moving to the first
data elementpublic boolean next() throws net.sf.jasperreports.engine.JRException
next
in interface net.sf.jasperreports.engine.JRDataSource
true
if there are more elements to iterate over and
false
otherwisenet.sf.jasperreports.engine.JRException
- if there is a problem determining whether there
is more dataCopyright © 2000–2020 Apache Software Foundation. All rights reserved.