org.jfree.report.expressions.sys

Class GroupByExpression

java.lang.Object

org.jfree.report.expressions.AbstractExpression

org.jfree.report.expressions.sys.GroupByExpression

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, Expression

public class GroupByExpression
extends AbstractExpression

Creation-Date: 08.10.2006, 16:28:37

Author:

Thomas Morgner

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
GroupByExpression()

Method Summary

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

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

GroupByExpression

public GroupByExpression()

Method Detail

computeValue

public java.lang.Object computeValue()
                              throws DataSourceException

Return the current expression value.

The value depends (obviously) on the expression implementation.

Returns:

the value of the function.

Throws:

DataSourceException

setField

public void setField(int index,
                     java.lang.String field)

getField

public java.lang.String getField(int index)

getFieldCount

public int getFieldCount()

getField

public java.lang.String[] getField()

setField

public void setField(java.lang.String[] fields)

clone

public java.lang.Object clone()
                       throws java.lang.CloneNotSupportedException

Description copied from class: AbstractExpression

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 class AbstractExpression

Returns:

A clone of this expression.

Throws:

java.lang.CloneNotSupportedException - this should never happen.