net.sf.jasperreports.engine.fill
Class JRVirtualizationContext

java.lang.Object
  net.sf.jasperreports.engine.fill.JRVirtualizationContext

All Implemented Interfaces:

Serializable, VirtualizationListener<VirtualElementsData>

public class JRVirtualizationContext
extends Object
implements Serializable, VirtualizationListener<VirtualElementsData>

Context used to store data shared by virtualized objects resulted from a report fill process.

Version:

$Id: JRVirtualizationContext.java 5180 2012-03-29 13:23:12Z teodord $

Author:

Lucian Chirita (lucianc@users.sourceforge.net)

See Also:

Serialized Form

Constructor Summary

	JRVirtualizationContext(JasperReportsContext jasperReportsContext) Constructs a context.
protected	JRVirtualizationContext(JRVirtualizationContext parentContext)

Method Summary

void	addListener(VirtualizationListener<VirtualElementsData> listener) Adds a virtualization listener.
void	afterExternalization(JRVirtualizable<VirtualElementsData> object)
void	afterInternalization(JRVirtualizable<VirtualElementsData> object) Called after an object's data was made available to the object.
void	beforeExternalization(JRVirtualizable<VirtualElementsData> object) Called before an object's data is externalized.
void	cacheRenderer(JRPrintImage image) Caches an image renderer.
void	cacheTemplate(JRPrintElement element) Caches the template of an element.
void	cacheTemplate(JRTemplateElement template) Caches an element template.
void	dispose() Marks this context as disposed in order to instruct the virtualizer that pages owned by this context are no longer used.
Renderable	getCachedRenderer(String id) Retrieves a cached image renderer based on an ID.
JRTemplateElement	getCachedTemplate(String templateId) Retrieves a cached template.
int	getPageElementSize() Returns the virtual page size used by the report.
static JRVirtualizationContext	getRegistered(JasperPrint print) Returns the virtualization context registered for a print object.
JRVirtualizer	getVirtualizer() Returns the virtualizer used by this context.
boolean	hasCachedRenderer(String id) Determines whether a cached image renderer for a specified ID exists.
boolean	hasCachedTemplate(String id) Determines whether a cached template with a specified ID exists.
boolean	isDisposed() Determines if this context is marked as disposed.
boolean	isReadOnly() Determines whether this context has been marked as read-only.
void	lock() Acquires a lock on this context.
static void	register(JRVirtualizationContext context, JasperPrint print) Registers a virtualization context for JasperPrint object.
void	removeListener(VirtualizationListener<VirtualElementsData> listener) Remove a virtualization listener.
Object	replaceSerializedObject(Object obj)
Object	resolveSerializedObject(Object obj)
void	setPageElementSize(int pageElementSize) Set the virtual page size used by the report.
void	setReadOnly(boolean readOnly) Sets the read-only flag for this context.
protected void	setVirtualizer(JRVirtualizer virtualizer)
protected void	traverseDeepElements(PrintElementVisitor<Void> visitor, Collection<? extends JRPrintElement> elements) Traverses all the elements on the page, including the ones placed inside frames.
boolean	tryLock() Attempts to acquire a lock on this context.
void	unlock() Releases the lock previously acquired on this context.

Methods inherited from class java.lang.Object

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

Constructor Detail

JRVirtualizationContext

public JRVirtualizationContext(JasperReportsContext jasperReportsContext)

Constructs a context.

JRVirtualizationContext

protected JRVirtualizationContext(JRVirtualizationContext parentContext)

Method Detail

addListener

public void addListener(VirtualizationListener<VirtualElementsData> listener)

Adds a virtualization listener.

Parameters:

listener -

removeListener

public void removeListener(VirtualizationListener<VirtualElementsData> listener)

Remove a virtualization listener.

Parameters:

listener -

beforeExternalization

public void beforeExternalization(JRVirtualizable<VirtualElementsData> object)

Description copied from interface: VirtualizationListener

Called before an object's data is externalized.

Specified by:

beforeExternalization in interface VirtualizationListener<VirtualElementsData>

See Also:

JRVirtualizable.beforeExternalization()

afterExternalization

public void afterExternalization(JRVirtualizable<VirtualElementsData> object)

afterInternalization

public void afterInternalization(JRVirtualizable<VirtualElementsData> object)

Description copied from interface: VirtualizationListener

Called after an object's data was made available to the object.

Specified by:

afterInternalization in interface VirtualizationListener<VirtualElementsData>

See Also:

JRVirtualizable.afterInternalization()

cacheRenderer

public void cacheRenderer(JRPrintImage image)

Caches an image renderer.

Parameters:

image - the image whose renderer should be cached

getCachedRenderer

public Renderable getCachedRenderer(String id)

Retrieves a cached image renderer based on an ID.

Parameters:

id - the ID

Returns:

the cached image renderer for the ID

hasCachedRenderer

public boolean hasCachedRenderer(String id)

Determines whether a cached image renderer for a specified ID exists.

Parameters:

id - the ID

Returns:

true if and only if the context contains a cached renderer with the specified ID

hasCachedTemplate

public boolean hasCachedTemplate(String id)

Determines whether a cached template with a specified ID exists.

Parameters:

id - the template ID

Returns:

true if and only if the context contains a cached template with the specified ID

cacheTemplate

public void cacheTemplate(JRTemplateElement template)

Caches an element template.

Parameters:

template - the template to cache

getCachedTemplate

public JRTemplateElement getCachedTemplate(String templateId)

Retrieves a cached template.

Parameters:

templateId - the template ID

Returns:

the cached template having the given ID

cacheTemplate

public void cacheTemplate(JRPrintElement element)

Caches the template of an element.

Parameters:

element - the element whose template to cache

isReadOnly

public boolean isReadOnly()

Determines whether this context has been marked as read-only.

Returns:

whether this context has been marked as read-only

See Also:

setReadOnly(boolean)

setReadOnly

public void setReadOnly(boolean readOnly)

Sets the read-only flag for this context.

When in read-only mode, all the virtualizable objects belonging to this context are assumed final by the virtualizer and any change in a virtualizable object's data would be discarded on virtualization.

Parameters:

readOnly - the read-only flag

register

public static void register(JRVirtualizationContext context,
                            JasperPrint print)

Registers a virtualization context for JasperPrint object.

Parameters:

context - the virtualization context

print - the print object

getRegistered

public static JRVirtualizationContext getRegistered(JasperPrint print)

Returns the virtualization context registered for a print object.

When the engine fills a report using a virtualizer, it registers the virtualization context with the generated JasperPrint object so that the caller would be able to retrieve the context based on the returned print object.

Parameters:

print - a print object

Returns:

the virtualization context registered for the print object, or null if no context has been registered

getPageElementSize

public int getPageElementSize()

Returns the virtual page size used by the report.

Returns:

the virtual page size used by the report

See Also:

JRVirtualPrintPage.PROPERTY_VIRTUAL_PAGE_ELEMENT_SIZE

setPageElementSize

public void setPageElementSize(int pageElementSize)

Set the virtual page size used by the report.

Parameters:

pageElementSize - the virtual page size

See Also:

JRVirtualPrintPage.PROPERTY_VIRTUAL_PAGE_ELEMENT_SIZE

getVirtualizer

public JRVirtualizer getVirtualizer()

Returns the virtualizer used by this context.

setVirtualizer

protected void setVirtualizer(JRVirtualizer virtualizer)

traverseDeepElements

protected void traverseDeepElements(PrintElementVisitor<Void> visitor,
                                    Collection<? extends JRPrintElement> elements)

Traverses all the elements on the page, including the ones placed inside frames.

Parameters:

visitor - element visitor

replaceSerializedObject

public Object replaceSerializedObject(Object obj)

resolveSerializedObject

public Object resolveSerializedObject(Object obj)

lock

public void lock()

Acquires a lock on this context.

tryLock

public boolean tryLock()

Attempts to acquire a lock on this context.

Returns:

true iff the lock was acquired on the context

unlock

public void unlock()

Releases the lock previously acquired on this context.

dispose

public void dispose()

Marks this context as disposed in order to instruct the virtualizer that pages owned by this context are no longer used.

isDisposed

public boolean isDisposed()

Determines if this context is marked as disposed.

Returns:

whether this context has been marked as disposed