net.sf.jasperreports.engine.fill

## Class JRFillCrosstab.JRFillCrosstabDataset

- java.lang.Object
- - net.sf.jasperreports.engine.fill.JRFillElementDataset
  - - net.sf.jasperreports.engine.fill.JRFillCrosstab.JRFillCrosstabDataset

- All Implemented Interfaces:
    java.lang.Cloneable, JRCrosstabDataset, JRCloneable, JRElementDataset
  Enclosing class:
    JRFillCrosstab

      public class JRFillCrosstab.JRFillCrosstabDataset
      extends JRFillElementDataset
      implements JRCrosstabDataset

  Fill-time crosstab input dataset implementation.
  Author:
    Lucian Chirita (lucianc@users.sourceforge.net)

- - ### Field Summary

    - ### Fields inherited from class net.sf.jasperreports.engine.fill.JRFillElementDataset

      `datasetRun, incrementGroup, parent, resetGroup`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `JRFillCrosstab.JRFillCrosstabDataset(JRCrosstabDataset dataset, JRFillObjectFactory factory)`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `collectExpressions(JRExpressionCollector collector)`
    `protected void` | `customEvaluate(JRCalculator calculator)` Evaluates the expressions associated with the dataset.
    `protected void` | `customIncrement()` Increments the dataset by collecting the result of the expression evaluation.
    `protected void` | `customInitialize()` Initializes the element dataset.
    `boolean` | `isDataPreSorted()` Returns whether the crosstab data is pre-sorted according to the crosstab's groups.

    - ### Methods inherited from class net.sf.jasperreports.engine.fill.JRFillElementDataset

      `clone, evaluate, evaluateDatasetRun, evaluateIncrementWhenExpression, getDatasetRun, getFillDataset, getIncrementGroup, getIncrementTypeValue, getIncrementWhenExpression, getInputDataset, getResetGroup, getResetTypeValue, getTimeZone, increment, initialize, setBand`

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

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

    - ### Methods inherited from interface net.sf.jasperreports.engine.JRElementDataset

      `getDatasetRun, getIncrementGroup, getIncrementTypeValue, getIncrementWhenExpression, getResetGroup, getResetTypeValue`

    - ### Methods inherited from interface net.sf.jasperreports.engine.JRCloneable

      `clone`

- - ### Constructor Detail

    - #### JRFillCrosstab.JRFillCrosstabDataset

          public JRFillCrosstab.JRFillCrosstabDataset(JRCrosstabDataset dataset,
                                              JRFillObjectFactory factory)

  - ### Method Detail

    - #### customInitialize

          protected void customInitialize()

      Description copied from class: `JRFillElementDataset`
      Initializes the element dataset.

      The dataset is initialized before being used and after each time the dataset gets reset.

      Specified by:
        `customInitialize` in class `JRFillElementDataset`
      See Also:
        `JRFillElementDataset.getResetTypeValue()`

    - #### customEvaluate

          protected void customEvaluate(JRCalculator calculator)
                                 throws JRExpressionEvalException

      Description copied from class: `JRFillElementDataset`
      Evaluates the expressions associated with the dataset.

      Usually, the result of the evaluation would be preserved so that it is used in `JRFillElementDataset.customIncrement()`

      Specified by:
        `customEvaluate` in class `JRFillElementDataset`
      Parameters:
        `calculator` - used to evaluate expressions
      Throws:
        `JRExpressionEvalException` - any exception that occurs while evaluating expressions

    - #### customIncrement

          protected void customIncrement()

      Description copied from class: `JRFillElementDataset`
      Increments the dataset by collecting the result of the expression evaluation.
      Specified by:
        `customIncrement` in class `JRFillElementDataset`

    - #### collectExpressions

          public void collectExpressions(JRExpressionCollector collector)

      Specified by:
        `collectExpressions` in interface `JRElementDataset`

    - #### isDataPreSorted

          public boolean isDataPreSorted()

      Description copied from interface: `JRCrosstabDataset`
      Returns whether the crosstab data is pre-sorted according to the crosstab's groups.

      The crosstab calculation engine can optimize the calculations if the data is sorted by the row groups and column groups. For example, if there are two row groups R1 and R2 (subgroup of R1) and three column groups C1, C2 and C3 the data should be sorted by R1, R2, C1, C2, C3.

      Specified by:
        `isDataPreSorted` in interface `JRCrosstabDataset`
      Returns:
        whether the crosstab data is pre-sorted

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