org.apache.struts2.views.jasperreports

## Class ValueStackDataSource

- java.lang.Object
- - org.apache.struts2.views.jasperreports.ValueStackDataSource

- All Implemented Interfaces:
    net.sf.jasperreports.engine.JRDataSource, net.sf.jasperreports.engine.JRRewindableDataSource

      public class ValueStackDataSource
      extends Object
      implements net.sf.jasperreports.engine.JRRewindableDataSource

  Ported to Struts.

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `ValueStackDataSource(ValueStack valueStack, String dataSourceParam, boolean wrapField)` Create a value stack data source on the given iterable property

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `Object` | `getFieldValue(net.sf.jasperreports.engine.JRField field)` Get the value of a given field
    `void` | `moveFirst()` Move to the first item.
    `boolean` | `next()` Is there any more data

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### ValueStackDataSource

          public ValueStackDataSource(ValueStack valueStack,
                              String dataSourceParam,
                              boolean wrapField)

      Create a value stack data source on the given iterable property
      Parameters:
        `valueStack` - The value stack to base the data source on
        `dataSourceParam` - The property to iterate over for the report

  - ### Method Detail

    - #### getFieldValue

          public Object getFieldValue(net.sf.jasperreports.engine.JRField field)
                               throws net.sf.jasperreports.engine.JRException

      Get the value of a given field
      Specified by:
        `getFieldValue` in interface `net.sf.jasperreports.engine.JRDataSource`
      Parameters:
        `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`.
      Returns:
        an `Object` containing the field value or a new `ValueStackDataSource` object if the field value evaluates to an object that can be iterated over.
      Throws:
        `net.sf.jasperreports.engine.JRException` - if there is a problem obtaining the value

    - #### moveFirst

          public void moveFirst()
                         throws net.sf.jasperreports.engine.JRException

      Move to the first item.
      Specified by:
        `moveFirst` in interface `net.sf.jasperreports.engine.JRRewindableDataSource`
      Throws:
        `net.sf.jasperreports.engine.JRException` - if there is a problem with moving to the first data element

    - #### next

          public boolean next()
                       throws net.sf.jasperreports.engine.JRException

      Is there any more data
      Specified by:
        `next` in interface `net.sf.jasperreports.engine.JRDataSource`
      Returns:
        `true` if there are more elements to iterate over and `false` otherwise
      Throws:
        `net.sf.jasperreports.engine.JRException` - if there is a problem determining whether there is more data

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