org.apache.tapestry5.internal.structure
Class PageImpl

java.lang.Object
  org.apache.tapestry5.internal.structure.PageImpl

All Implemented Interfaces:

Page

public class PageImpl
extends Object
implements Page

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.tapestry5.internal.structure.Page

Page.Stats

Constructor Summary

PageImpl(String name, ComponentResourceSelector selector, PersistentFieldManager persistentFieldManager, PerthreadManager perThreadManager)

Method Summary

void	addLifecycleListener(PageLifecycleListener listener) Adds a listener that is notified of large scale page events.
void	addResetListener(PageResetListener listener) Adds a new listener for page reset events.
void	addVerifyListener(Runnable callback) Adds a verify callback, which is allowed while the page is loading.
void	attached() Invoked to inform the page that it is attached to the current request.
boolean	detached() Invoked to inform the page that it is being detached from the current request.
void	discardPersistentFieldChanges() Discards all persistent field changes for the page containing the component.
int	getAttachCount() Returns the number of times the page has been attached to a request.
ComponentPageElement	getComponentElementByNestedId(String nestedId) Retrieves a component element by its nested id (a sequence of simple ids, separated by dots).
Object	getFieldChange(String nestedId, String fieldName) Gets a change for a field within the component.
org.slf4j.Logger	getLogger() Returns the logger of the root component element.
String	getName() Returns the short, logical name for the page.
Component	getRootComponent() The root component of the page.
ComponentPageElement	getRootElement() The root component of the page.
ComponentResourceSelector	getSelector() The selector (which includes Locale) used when the page was constructor.
Page.Stats	getStats() Returns the page construction statistics for this page.
boolean	hasResetListeners() Returns true if there are any PageResetListener listeners.
void	loaded() Inform the page that it is now completely loaded.
void	pageReset() Invoked to notify PageResetListener listeners.
void	persistFieldChange(ComponentResources resources, String fieldName, Object newValue) Posts a change to a persistent field.
void	removeLifecycleListener(PageLifecycleListener listener) Removes a listener that was previously added.
void	setRootElement(ComponentPageElement component) Invoked during page construction time to connect the page's root component to the page instance.
void	setStats(Page.Stats stats) Invoked once at the end of page construction, to provide page construction statistics.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

PageImpl

public PageImpl(String name,
                ComponentResourceSelector selector,
                PersistentFieldManager persistentFieldManager,
                PerthreadManager perThreadManager)

Parameters:

name - canonicalized page name

selector - used to locate resources

persistentFieldManager - for access to cross-request persistent values

perThreadManager - for managing per-request mutable state

Method Detail

setStats

public void setStats(Page.Stats stats)

Description copied from interface: Page

Invoked once at the end of page construction, to provide page construction statistics.

Specified by:

setStats in interface Page

getStats

public Page.Stats getStats()

Description copied from interface: Page

Returns the page construction statistics for this page.

Specified by:

getStats in interface Page

toString

public String toString()

Overrides:

toString in class Object

getComponentElementByNestedId

public ComponentPageElement getComponentElementByNestedId(String nestedId)

Description copied from interface: Page

Retrieves a component element by its nested id (a sequence of simple ids, separated by dots). The individual names in the nested id are matched without regards to case. A nested id of '' (the empty string) returns the root element of the page.

Specified by:

getComponentElementByNestedId in interface Page

getSelector

public ComponentResourceSelector getSelector()

Description copied from interface: Page

The selector (which includes Locale) used when the page was constructor.

Specified by:

getSelector in interface Page

setRootElement

public void setRootElement(ComponentPageElement component)

Description copied from interface: Page

Invoked during page construction time to connect the page's root component to the page instance.

Specified by:

setRootElement in interface Page

getRootElement

public ComponentPageElement getRootElement()

Description copied from interface: Page

The root component of the page. This is the wrapper around the end developer's view of the page.

Specified by:

getRootElement in interface Page

getRootComponent

public Component getRootComponent()

Description copied from interface: Page

The root component of the page. A convenience over invoking getRootElement().getComponent().

Specified by:

getRootComponent in interface Page

addLifecycleListener

public void addLifecycleListener(PageLifecycleListener listener)

Description copied from interface: Page

Adds a listener that is notified of large scale page events.

Specified by:

addLifecycleListener in interface Page

removeLifecycleListener

public void removeLifecycleListener(PageLifecycleListener listener)

Description copied from interface: Page

Removes a listener that was previously added.

Specified by:

removeLifecycleListener in interface Page

detached

public boolean detached()

Description copied from interface: Page

Invoked to inform the page that it is being detached from the current request. This occurs just before the page is returned to the page pool.

A page may be clean or dirty. A page is dirty if its dirty count is greater than zero (meaning that, during the render of the page, some components did not fully render), or if any of its listeners throw an exception from containingPageDidDetach().

The page pool should discard pages that are dirty, rather than store them into the pool.

Under Tapestry 5.2 and pool-less pages, the result is ignored; all mutable state is expected to be discarded automatically from the PerthreadManager. A future release of Tapestry will likely convert this method to type void.

Specified by:

detached in interface Page

Returns:

true if the page is "dirty", false otherwise

See Also:

PageLifecycleListener.containingPageDidDetach()

loaded

public void loaded()

Description copied from interface: Page

Inform the page that it is now completely loaded.

Specified by:

loaded in interface Page

See Also:

PageLifecycleListener.containingPageDidLoad()

attached

public void attached()

Description copied from interface: Page

Invoked to inform the page that it is attached to the current request. This occurs when a page is first referenced within a request. If the page was created from scratch for this request, the call to Page.loaded() will preceded the call to Page.attached().

First all listeners have PageLifecycleListener.restoreStateBeforePageAttach() invoked, followed by PageLifecycleListener.containingPageDidAttach().

Specified by:

attached in interface Page

getLogger

public org.slf4j.Logger getLogger()

Description copied from interface: Page

Returns the logger of the root component element. Any logging about page construction or activity should be sent to this logger.

Specified by:

getLogger in interface Page

persistFieldChange

public void persistFieldChange(ComponentResources resources,
                               String fieldName,
                               Object newValue)

Description copied from interface: Page

Posts a change to a persistent field.

Specified by:

persistFieldChange in interface Page

Parameters:

resources - the component resources for the component or mixin containing the field whose value changed

fieldName - the name of the field

newValue - the new value for the field

getFieldChange

public Object getFieldChange(String nestedId,
                             String fieldName)

Description copied from interface: Page

Gets a change for a field within the component.

Specified by:

getFieldChange in interface Page

Parameters:

nestedId - the nested component id of the component containing the field

fieldName - the name of the persistent field

Returns:

the value, or null if no value is stored

discardPersistentFieldChanges

public void discardPersistentFieldChanges()

Description copied from interface: Page

Discards all persistent field changes for the page containing the component. Changes are eliminated from persistent storage (such as the Session) which will take effect in the next request (the attached page instance is not affected).

Specified by:

discardPersistentFieldChanges in interface Page

getName

public String getName()

Description copied from interface: Page

Returns the short, logical name for the page. This is the page name as it might included in an action or page render URL (though it will be converted to lower case when it is included).

Specified by:

getName in interface Page

addResetListener

public void addResetListener(PageResetListener listener)

Description copied from interface: Page

Adds a new listener for page reset events.

Specified by:

addResetListener in interface Page

Parameters:

listener - will receive notifications when the page is accessed from a different page

addVerifyListener

public void addVerifyListener(Runnable callback)

Description copied from interface: Page

Adds a verify callback, which is allowed while the page is loading. Such callbacks are invoked once, after the page has been loaded succesfully. This was added specifically to ensure that components only verify that required parameters are bound after all components and mixins of the page have had a chance to initialize.

Specified by:

addVerifyListener in interface Page

Parameters:

callback - to be invoked after page loaded

pageReset

public void pageReset()

Description copied from interface: Page

Invoked to notify PageResetListener listeners.

Specified by:

pageReset in interface Page

hasResetListeners

public boolean hasResetListeners()

Description copied from interface: Page

Returns true if there are any PageResetListener listeners.

Specified by:

hasResetListeners in interface Page

getAttachCount

public int getAttachCount()

Description copied from interface: Page

Returns the number of times the page has been attached to a request. This is a rough measure of how important the page is, relative to other pages. This value is volatile, changing constantly.

Specified by:

getAttachCount in interface Page