Package net.sf.jasperreports.engine.data

Class DataSourceCollection<D extends JRDataSource,P extends DataSourceProvider<D>>

java.lang.Object

net.sf.jasperreports.engine.data.DataSourceCollection<D,P>

All Implemented Interfaces:

JRDataSource

Direct Known Subclasses:

RewindableDataSourceCollection

public class DataSourceCollection<D extends JRDataSource,P extends DataSourceProvider<D>>
extends Object
implements JRDataSource

Author:

Lucian Chirita (lucianc@users.sourceforge.net)

Field Summary

Fields

Modifier and Type	Field	Description
protected D	currentDataSource
protected boolean	empty
static String	EXCEPTION_MESSAGE_KEY_METHOD_CALL_ERROR
protected ListIterator<? extends P>	providerIterator

Constructor Summary

Constructors

Constructor	Description
DataSourceCollection(List<? extends P> dataSourceProviders)

Method Summary

Modifier and Type	Method	Description
D	currentDataSource()
Object	getFieldValue(JRField field)	Gets the field value for the current position.
boolean	next()	Tries to position the cursor on the next element in the data source.
protected void	start()

Methods inherited from class java.lang.Object

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

Field Detail

EXCEPTION_MESSAGE_KEY_METHOD_CALL_ERROR

public static final String EXCEPTION_MESSAGE_KEY_METHOD_CALL_ERROR

See Also:

Constant Field Values

empty

protected final boolean empty

providerIterator

protected final ListIterator<? extends P extends DataSourceProvider<D>> providerIterator

currentDataSource

protected D extends JRDataSource currentDataSource

Constructor Detail

DataSourceCollection

public DataSourceCollection(List<? extends P> dataSourceProviders)
                     throws JRException

Throws:

JRException

Method Detail

start

protected final void start()
                    throws JRException

Throws:

JRException

currentDataSource

public D currentDataSource()

next

public boolean next()
             throws JRException

Description copied from interface: JRDataSource

Tries to position the cursor on the next element in the data source.

Specified by:

next in interface JRDataSource

Returns:

true if there is a next record, false otherwise

Throws:

JRException - if any error occurs while trying to move to the next element

getFieldValue

public Object getFieldValue(JRField field)
                     throws JRException

Description copied from interface: JRDataSource

Gets the field value for the current position.

Specified by:

getFieldValue in interface JRDataSource

Returns:

an object containing the field value. The object type must be the field object type.

Throws:

JRException