GroupByExpression (flow-engine JavaDoc)

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 Description

GroupByExpression()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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.