net.sf.jasperreports.crosstabs

Interface JRCrosstabBucket

All Superinterfaces:

Cloneable, JRCloneable

All Known Implementing Classes:

JRBaseCrosstabBucket, JRDesignCrosstabBucket

public interface JRCrosstabBucket
extends JRCloneable

Crosstab groups bucketing information interface.

The bucketing information consists of the grouping expression and sorting information. The buckets can be sorted according to the natural sorting (if the values implement Comparable) or using a comparator.

Author:

Lucian Chirita ([email protected])

Method Summary

Modifier and Type	Method and Description
JRExpression	getComparatorExpression() Returns the comparator expression.
JRExpression	getExpression() Returns the grouping expression.
BucketOrder	getOrder() Returns the bucket sorting type.
JRExpression	getOrderByExpression() Returns an expression that provides order by values for group buckets.
Class<?>	getValueClass() Returns the class of the bucket value.
String	getValueClassName() Returns the string name of the bucket value class.

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

clone

Method Detail

getValueClass

Class<?> getValueClass()

Returns the class of the bucket value. Any class is allowed as long as it is in the classpath at compile and run time.

Returns:

a Class instance representing the bucket value class

getValueClassName

String getValueClassName()

Returns the string name of the bucket value class.

getOrder

BucketOrder getOrder()

Returns the bucket sorting type.

The possible values are:

• BucketOrder.ASCENDING
• BucketOrder.DESCENDING
• BucketOrder.NONE

Returns:

the bucket sorting type

See Also:

getComparatorExpression()

getExpression

JRExpression getExpression()

Returns the grouping expression.

Returns:

the grouping expression

getComparatorExpression

JRExpression getComparatorExpression()

Returns the comparator expression.

The result of this expression is used to sort the buckets, in ascending or descending order (given by getOrder(). If the bucket has an order by expression, the comparator will be used to compare values as produced by that expression. If no comparator expression is specified, the natural order will be used.

Returns:

the comparator expression

See Also:

getOrderByExpression()

getOrderByExpression

JRExpression getOrderByExpression()

Returns an expression that provides order by values for group buckets. If not set, the bucket values as returned by getExpression() are used to order the buckets.

The expression is evaluated in the context of the crosstab group and can reference measure variables, which evaluate to group totals.

Returns:

the order by value expression for the group bucket