org.jfree.report.expressions.sys

Class GroupByExpression

Implemented Interfaces:
Cloneable, Expression, Serializable

public class GroupByExpression
extends AbstractExpression

Creation-Date: 08.10.2006, 16:28:37
Author:
Thomas Morgner

Constructor Summary

GroupByExpression()

Method Summary

Object
clone()
Clones the expression, expression should be reinitialized after the cloning.
Object
computeValue()
Return the current expression value.
String[]
getField()
String
getField(int index)
int
getFieldCount()
void
setField(String[] fields)
void
setField(int index, String field)

Methods inherited from class org.jfree.report.expressions.AbstractExpression

clone, getDataRow, getInstance, getName, getParentLocale, getReportConfiguration, getResourceBundleFactory, getRuntime, isDeepTraversing, isPrecompute, isPreserve, setDeepTraversing, setName, setPrecompute, setPreserve, setRuntime

Constructor Details

GroupByExpression

public GroupByExpression()

Method Details

clone

public Object clone()
            throws CloneNotSupportedException
Clones the expression, expression should be reinitialized after the cloning.

Expression maintain no state, cloning is done at the beginning of the report processing to disconnect the used expression from any other object space.

Specified by:
clone in interface Expression
Overrides:
clone in interface AbstractExpression
Returns:
A clone of this expression.

computeValue

public Object computeValue()
            throws DataSourceException
Return the current expression value.

The value depends (obviously) on the expression implementation.

Specified by:
computeValue in interface Expression
Returns:
the value of the function.

getField

public String[] getField()

getField

public String getField(int index)

getFieldCount

public int getFieldCount()

setField

public void setField(String[] fields)

setField

public void setField(int index,
                     String field)