org.jfree.report.filter
Interface DataSource

All Known Subinterfaces:

DataFilter, RawDataSource, Template

All Known Implementing Classes:

DataRowDataSource, EmptyDataSource, MessageFormatFilter, ResourceMessageFormatFilter, StaticDataSource

public interface DataSource

extends java.io.Serializable, java.lang.Cloneable

A DataSource is a producer in the data chain. Common Sources are StaticSources (predefined data), ReportDataSources (data filled from the reports data set) or FunctionDataSource (the data is filled by querying an assigned function).

All DataSources have to support the Cloneable interface so that a report can be completley cloned with all assigned filters and DataSources. Reports are cloned before they are processed to remove the side effect when having multiple report processors working on the same object.

Author:

Thomas Morgner

Method Summary

java.lang.Object	clone() Clones this DataSource.
java.lang.Object	getValue() Returns the current value for the data source.

Method Detail

getValue

public java.lang.Object getValue()

Returns the current value for the data source.

Returns:

the value.

clone

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

Clones this DataSource.

Overrides:

clone in class java.lang.Object

Returns:

the clone.

Throws:

java.lang.CloneNotSupportedException - this should never happen.