Page (Wicket Core 7.16.0 API)

java.lang.Object
- org.apache.wicket.Component
- - org.apache.wicket.MarkupContainer
  - - org.apache.wicket.Page

All Implemented Interfaces:

Serializable, Iterable<Component>, IEventSink, IEventSource, IConverterLocator, IQueueRegion, IHeaderContributor, IManageablePage, IRequestableComponent, IRequestablePage, IHierarchical<Component>, IClusterable

Direct Known Subclasses:

WebPage
```
public abstract class Page
extends MarkupContainer
implements IRequestablePage, IQueueRegion
```
Abstract base class for pages. As a MarkupContainer subclass, a Page can contain a component hierarchy and markup in some markup language such as HTML. Users of the framework should not attempt to subclass Page directly. Instead they should subclass a subclass of Page that is appropriate to the markup type they are using, such as WebPage (for HTML markup).
Page has the following differences to Components main concepts:
- Identity - Page numerical identifiers start at 0 for each Session and increment for each new page. This numerical identifier is used as the component identifier accessible via getId().
- Construction - When a page is constructed, it is automatically registerd with the application's IPageManager.
  Pages can be constructed with any constructor like any other component, but if you wish to link to a Page using a URL that is "bookmarkable" (which implies that the URL will not have any session information encoded in it, and that you can call this page directly without having a session first directly from your browser), you need to implement your Page with a no-arg constructor or with a constructor that accepts a PageParameters argument (which wraps any query string parameters for a request). In case the page has both constructors, the constructor with PageParameters will be used.
- Versioning - Pages support the browser's back button when versioning is enabled via Component.setVersioned(boolean). By default all pages are versioned if not configured differently in PageSettings.setVersionPagesByDefault(boolean)
Author:

Jonathan Locke, Chris Turner, Eelco Hillenius, Johan Compagner

See Also:
WebPage, MarkupContainer, CompoundPropertyModel, Component, Serialized Form

Field Summary
- Fields inherited from class org.apache.wicket.Component
  ENABLE, FLAG_AFTER_RENDERING, FLAG_INITIALIZED, FLAG_PREPARED_FOR_RENDER, FLAG_REMOVING_FROM_HIERARCHY, FLAG_RENDERING, FLAG_RESERVED1, FLAG_RESERVED2, FLAG_RESERVED3, FLAG_RESERVED4, FLAG_RESERVED5, FLAG_RESERVED8, PARENT_PATH, PATH_SEPARATOR, RENDER, RFLAG_CONTAINER_DEQUEING

Constructor Summary

Constructors
Modifier	Constructor and Description
`protected`	`Page()` Constructor.
`protected`	`Page(IModel<?> model)` Constructor.
`protected`	`Page(PageParameters parameters)` The `PageParameters` parameter will be stored in this page and then those parameters will be used to create stateless links to this bookmarkable page.

Method Summary

Methods
Modifier and Type	Method and Description
`protected void`	`componentChanged(Component component, MarkupContainer parent)` This method will be called for all components that are changed on the page So also auto components or components that are not versioned.
`void`	`componentRendered(Component component)` Adds a component to the set of rendered components.
`void`	`detachModels()` Detaches any attached models referenced by this page.
`void`	`dirty()`
`void`	`dirty(boolean isInitialization)` Mark this page as modified in the session.
`void`	`endComponentRender(Component component)` THIS METHOD IS NOT PART OF THE WICKET PUBLIC API.
`int`	`getAutoIndex()` THIS METHOD IS NOT PART OF THE WICKET PUBLIC API.
`String`	`getId()` Gets the id of this component.
`MarkupType`	`getMarkupType()` Get the type of associated markup for this component.
`Class<? extends Page>`	`getPageClass()`
`int`	`getPageId()`
`PageParameters`	`getPageParameters()` The `PageParameters` object that was used to construct this page.
`PageReference`	`getPageReference()` Gets page instance's unique identifier
`int`	`getRenderCount()` Returns the number of times this page has been rendered.
`long`	`getSizeInBytes()`
`boolean`	`getStatelessHint()` Returns whether the page should try to be stateless.
`String`	`hierarchyAsString()`
`protected void`	`internalOnModelChanged()` THIS METHOD IS NOT PART OF THE WICKET PUBLIC API.
`void`	`internalPrepareForRender(boolean setRenderingFlag)` THIS METHOD IS NOT PART OF THE WICKET PUBLIC API.
`boolean`	`isBookmarkable()` Bookmarkable page can be instantiated using a bookmarkable URL.
`boolean`	`isErrorPage()` Override this method and return true if your page is used to display Wicket errors.
`boolean`	`isPageStateless()` Gets whether the page is stateless.
`protected void`	`onAfterRender()` Called just after a component is rendered.
`protected void`	`onBeforeRender()` Called just before a component is rendered only if the component is visible.
`protected void`	`onDetach()` Called to allow a component to detach resources after use.
`protected void`	`onInitialize()` This method is meant to be used as an alternative to initialize components.
`protected void`	`onRender()` Implementation that renders this component.
`void`	`renderPage()` Renders the page
`boolean`	`setFreezePageId(boolean freeze)` Sets whether or not the page is allowed to change its page id.
`void`	`setNumericId(int id)` THIS METHOD IS NOT PART OF THE WICKET PUBLIC API.
`Page`	`setStatelessHint(boolean value)` Sets whether the page should try to be stateless.
`void`	`setWasCreatedBookmarkable(boolean wasCreatedBookmarkable)` THIS METHOD IS NOT PART OF WICKET API.
`void`	`startComponentRender(Component component)` THIS METHOD IS NOT PART OF THE WICKET PUBLIC API.
`String`	`toString()` Get the string representation of this container.
`boolean`	`wasCreatedBookmarkable()` Checks if this page was created using one of its bookmarkable constructors
`boolean`	`wasRendered(Component component)` THIS METHOD IS NOT PART OF THE WICKET PUBLIC API.

Methods inherited from class org.apache.wicket.MarkupContainer
add, addDequeuedComponent, addOrReplace, autoAdd, canDequeueTag, contains, dequeue, dequeue, dequeuePreamble, findChildComponent, findComponentToDequeue, get, get, getAssociatedMarkup, getAssociatedMarkupStream, getMarkup, getRegionMarkup, internalAdd, internalInitialize, iterator, iterator, newDequeueContext, onAfterRenderChildren, onComponentTagBody, queue, remove, remove, removeAll, renderAll, renderAssociatedMarkup, renderNext, replace, setDefaultModel, size, swap, toString, visitChildren, visitChildren, visitChildren, visitChildren

Methods inherited from class org.apache.wicket.Component
add, addStateChange, afterRender, beforeRender, canCallListenerInterface, canCallListenerInterfaceAfterExpiry, checkComponentTag, checkComponentTagAttribute, checkHierarchyChange, clearOriginalDestination, configure, continueToOriginalDestination, createConverter, debug, detach, detachModel, determineVisibility, error, exceptionMessage, fatal, findMarkupStream, findPage, findParent, findParentWithAssociatedMarkup, getAjaxRegionMarkupId, getApplication, getBehaviorById, getBehaviorId, getBehaviors, getBehaviors, getClassRelativePath, getConverter, getDefaultModel, getDefaultModelObject, getDefaultModelObjectAsString, getDefaultModelObjectAsString, getEscapeModelStrings, getFeedbackMessages, getFlag, getInnermostModel, getInnermostModel, getLocale, getLocalizer, getMarkup, getMarkupAttributes, getMarkupId, getMarkupId, getMarkupIdFromMarkup, getMarkupIdImpl, getMarkupSourcingStrategy, getMetaData, getModelComparator, getOutputMarkupId, getOutputMarkupPlaceholderTag, getPage, getPageRelativePath, getParent, getPath, getRenderBodyOnly, getRequest, getRequestCycle, getRequestFlag, getResponse, getSession, getString, getString, getString, getStyle, getVariation, hasBeenRendered, hasErrorMessage, hasFeedbackMessage, info, initModel, internalRenderComponent, internalRenderHead, isActionAuthorized, isAuto, isBehaviorAccepted, isEnableAllowed, isEnabled, isEnabledInHierarchy, isIgnoreAttributeModifier, isRenderAllowed, isRendering, isStateless, isVersioned, isVisibilityAllowed, isVisible, isVisibleInHierarchy, markRendering, modelChanged, modelChanging, newMarkupSourcingStrategy, onComponentTag, onConfigure, onEvent, onModelChanged, onModelChanging, onReAdd, onRemove, prepareForRender, redirectToInterceptPage, remove, remove, render, renderComponentTag, rendered, renderHead, renderHead, renderPlaceholderTag, replaceComponentTagBody, replaceWith, sameInnermostModel, sameInnermostModel, send, setAuto, setDefaultModelObject, setEnabled, setEscapeModelStrings, setFlag, setIgnoreAttributeModifier, setMarkup, setMarkupId, setMarkupIdImpl, setMetaData, setOutputMarkupId, setOutputMarkupPlaceholderTag, setParent, setRenderBodyOnly, setRequestFlag, setResponsePage, setResponsePage, setResponsePage, setVersioned, setVisibilityAllowed, setVisible, success, urlFor, urlFor, urlFor, urlFor, urlFor, visitParents, visitParents, warn, wrap

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.wicket.request.component.IRequestableComponent
canCallListenerInterfaceAfterExpiry, detach, get, getBehaviorById, getBehaviorId, getPage, getPageRelativePath

Methods inherited from interface org.apache.wicket.page.IManageablePage
detach

Methods inherited from interface org.apache.wicket.IQueueRegion
dequeue, getRegionMarkup, newDequeueContext

- Constructor Detail
  - Page
```
protected Page()
```
    Constructor.
  - Page
```
protected Page(IModel<?> model)
```
    Constructor.
    
    Parameters:
    model - See Component
    See Also:
    Component.Component(String, IModel)
  - Page
```
protected Page(PageParameters parameters)
```
    The PageParameters parameter will be stored in this page and then those parameters will be used to create stateless links to this bookmarkable page.
    
    Parameters:
    parameters - externally passed parameters
    See Also:
    PageParameters
- Method Detail
  - getPageParameters
```
public PageParameters getPageParameters()
```
    The PageParameters object that was used to construct this page. This will be used in creating stateless/bookmarkable links to this page
    
    Specified by:
    
    getPageParameters in interface IRequestablePage
    
    Returns:
    PageParameters The construction page parameter
  - componentRendered
```
public final void componentRendered(Component component)
```
    Adds a component to the set of rendered components.
    
    Parameters:
    component - The component that was rendered
  - detachModels
```
public void detachModels()
```
    Detaches any attached models referenced by this page.
    
    Overrides:
    
    detachModels in class Component
  - internalPrepareForRender
```
public void internalPrepareForRender(boolean setRenderingFlag)
```
    Description copied from class: Component
    
    THIS METHOD IS NOT PART OF THE WICKET PUBLIC API. DO NOT USE IT!
    Prepares the component and it's children for rendering. On whole page render this method must be called on the page. On AJAX request, this method must be called on the updated component.
    
    Overrides:
    
    internalPrepareForRender in class Component
    
    Parameters:
    setRenderingFlag - Whether to set the rendering flag. This must be true if the page is about to be rendered. However, there are usecases to call this method without an immediate render (e.g. on stateless listener request target to build the component hierarchy), in that case setRenderingFlag should be false.
    See Also:
    Component.internalPrepareForRender(boolean)
  - dirty
```
public final void dirty()
```
    See Also:
    dirty(boolean)
  - setFreezePageId
```
public boolean setFreezePageId(boolean freeze)
```
    Sets whether or not the page is allowed to change its page id. Implementations of this interface usually change their page id once a change to the data structure is made and historical record of the current state needs to be kept (usually to be accessible via the back button). Keeping a historical record is usually achieved by simply incrementing the page id to the next unique number, so when the implementation is stored it is done so in a new slot. This method is useful when for some reason we do not want the implementation to change its page id under any circumstances. One concrete example is an AJAX request. Suppose the page with id 10 was written out with callbacks pointing to id 10. Suppose that the user executed some AJAX callbacks which have changed the page id to 15. Now, the user clicks a non-AJAX link that was never updated by an AJAX update and still points to id 10 - which causes the state of the page to be rolled back - which is usually undesirable as all changes made to the page by AJAX requests are lost. So, instead, whatever is invoking the execution of the AJAX request on the page can use this method to tell the page to not update its page id thereby solving the problem.
    
    Specified by:
    
    setFreezePageId in interface IManageablePage
    
    Returns:
    previous state
  - dirty
```
public void dirty(boolean isInitialization)
```
    Mark this page as modified in the session. If versioning is supported then a new version of the page will be stored in page store
    
    Parameters:
    isInitialization - a flag whether this is a page instantiation
  - onInitialize
```
protected void onInitialize()
```
    Description copied from class: Component
    
    This method is meant to be used as an alternative to initialize components. Usually the component's constructor is used for this task, but sometimes a component cannot be initialized in isolation, it may need to access its parent component or its markup in order to fully initialize. This method is invoked once per component's lifecycle when a path exists from this component to the Page thus providing the component with an atomic callback when the component's environment is built out.
    Overrides must call super#Component.onInitialize(). Usually this should be the first thing an override does, much like a constructor.
    
    Parent containers are guaranteed to be initialized before their children
    
    It is safe to use Component.getPage() in this method
    
    NOTE:The timing of this call is not precise, the contract is that it is called sometime before Component.onBeforeRender().
    
    Overrides:
    
    onInitialize in class MarkupContainer
  - endComponentRender
```
public final void endComponentRender(Component component)
```
    THIS METHOD IS NOT PART OF THE WICKET PUBLIC API. DO NOT CALL. This method is called when a component was rendered standalone. If it is a MarkupContainer then the rendering for that container is checked.
    
    Parameters:
    component -
  - getAutoIndex
```
public final int getAutoIndex()
```
    THIS METHOD IS NOT PART OF THE WICKET PUBLIC API. DO NOT CALL IT. Get a page unique number, which will be increased with each call.
    
    Returns:
    A page unique number
  - getId
```
public final String getId()
```
    Description copied from class: Component
    
    Gets the id of this component.
    
    Specified by:
    
    getId in interface IRequestableComponent
    
    Overrides:
    
    getId in class Component
    
    Returns:
    The id of this component
    See Also:
    Component.getId()
  - getPageClass
```
public final Class<? extends Page> getPageClass()
```
    Returns:
    page class
  - getSizeInBytes
```
public final long getSizeInBytes()
```
    Overrides:
    
    getSizeInBytes in class Component
    
    Returns:
    Size of this page in bytes
  - getStatelessHint
```
public final boolean getStatelessHint()
```
    Returns whether the page should try to be stateless. To be stateless, getStatelessHint() of every component on page (and it's behavior) must return true and the page must be bookmarkable.
    
    Overrides:
    
    getStatelessHint in class Component
    
    Returns:
    whether the component can be stateless
    See Also:
    Component.getStatelessHint()
  - hierarchyAsString
```
public final String hierarchyAsString()
```
    Returns:
    This page's component hierarchy as a string
  - isBookmarkable
```
public boolean isBookmarkable()
```
    Bookmarkable page can be instantiated using a bookmarkable URL.
    
    Specified by:
    
    isBookmarkable in interface IRequestablePage
    
    Returns:
    Returns true if the page is bookmarkable.
  - isErrorPage
```
public boolean isErrorPage()
```
    Override this method and return true if your page is used to display Wicket errors. This can help the framework prevent infinite failure loops.
    
    Returns:
    True if this page is intended to display an error to the end user.
  - isPageStateless
```
public final boolean isPageStateless()
```
    Gets whether the page is stateless. Components on stateless page must not render any stateful urls, and components on stateful page must not render any stateless urls. Stateful urls are urls, which refer to a certain (current) page instance.
    
    Specified by:
    
    isPageStateless in interface IManageablePage
    
    Returns:
    Whether this page is stateless
  - setNumericId
```
public final void setNumericId(int id)
```
    THIS METHOD IS NOT PART OF THE WICKET PUBLIC API. DO NOT CALL. Set the id for this Page. This method is called by PageMap when a Page is added because the id, which is assigned by PageMap, is not known until this time.
    
    Parameters:
    id - The id
  - setStatelessHint
```
public final Page setStatelessHint(boolean value)
```
    Sets whether the page should try to be stateless. To be stateless, getStatelessHint() of every component on page (and it's behavior) must return true and the page must be bookmarkable.
    
    Parameters:
    value - whether the page should try to be stateless
  - startComponentRender
```
public final void startComponentRender(Component component)
```
    THIS METHOD IS NOT PART OF THE WICKET PUBLIC API. DO NOT CALL. This method is called when a component will be rendered standalone.
    
    Parameters:
    component -
  - toString
```
public String toString()
```
    Get the string representation of this container.
    
    Overrides:
    
    toString in class MarkupContainer
    
    Returns:
    String representation of this container
    See Also:
    Component.toString()
  - componentChanged
```
protected void componentChanged(Component component,
                    MarkupContainer parent)
```
    This method will be called for all components that are changed on the page So also auto components or components that are not versioned. If the parent is given that it was a remove or add from that parent of the given component. else it was just a internal property change of that component.
    
    Parameters:
    component -
    parent -
  - internalOnModelChanged
```
protected final void internalOnModelChanged()
```
    THIS METHOD IS NOT PART OF THE WICKET PUBLIC API. DO NOT CALL OR OVERRIDE.
    
    Overrides:
    
    internalOnModelChanged in class Component
    
    See Also:
    Component.internalOnModelChanged()
  - onBeforeRender
```
protected void onBeforeRender()
```
    Description copied from class: Component
    
    Called just before a component is rendered only if the component is visible.
    NOTE: If you override this, you *must* call super.onBeforeRender() within your implementation. Because this method is responsible for cascading Component.onBeforeRender() call to its children it is strongly recommended that super call is made at the end of the override.
    Changes to the component tree can be made only before calling super.onBeforeRender().
    
    Overrides:
    
    onBeforeRender in class Component
    
    See Also:
    Component.onBeforeRender()
  - onAfterRender
```
protected void onAfterRender()
```
    Description copied from class: Component
    
    Called just after a component is rendered.
    
    Overrides:
    
    onAfterRender in class Component
    
    See Also:
    Component.onAfterRender()
  - onDetach
```
protected void onDetach()
```
    Description copied from class: Component
    
    Called to allow a component to detach resources after use. Overrides of this method MUST call the super implementation, the most logical place to do this is the last line of the override method.
    
    Overrides:
    
    onDetach in class MarkupContainer
    
    See Also:
    Component.onDetach()
  - onRender
```
protected void onRender()
```
    Description copied from class: Component
    
    Implementation that renders this component.
    
    Overrides:
    
    onRender in class MarkupContainer
    
    See Also:
    MarkupContainer.onRender()
  - getMarkupType
```
public MarkupType getMarkupType()
```
    Description copied from class: MarkupContainer
    
    Get the type of associated markup for this component. The markup type for a component is independent of whether or not the component actually has an associated markup resource file (which is determined at runtime).
    
    Overrides:
    
    getMarkupType in class MarkupContainer
    
    Returns:
    The type of associated markup for this component (for example, "html", "wml" or "vxml"). If there is no markup type for a component, null may be returned, but this means that no markup can be loaded for the class. Null is also returned if the component, or any of its parents, has not been added to a Page.
    See Also:
    MarkupContainer.getMarkupType()
  - getPageReference
```
public PageReference getPageReference()
```
    Gets page instance's unique identifier
    
    Returns:
    instance unique identifier
  - getPageId
```
public int getPageId()
```
    Specified by:
    
    getPageId in interface IManageablePage
    
    Returns:
    A unique identifier for this page map entry
    See Also:
    IManageablePage.getPageId()
  - getRenderCount
```
public int getRenderCount()
```
    Description copied from interface: IRequestablePage
    
    Returns the number of times this page has been rendered. The number will be appended to listener interface links in order to prevent invoking listeners from staled page version.
    For example a same page might have been rendered in two separate tabs. Page render doesn't change page id but it can modify component hierarchy. Listener interface links on such page should only work in tab where the page was rendered most recently.
    
    Specified by:
    
    getRenderCount in interface IRequestablePage
    
    Returns:
    render count
  - setWasCreatedBookmarkable
```
public final void setWasCreatedBookmarkable(boolean wasCreatedBookmarkable)
```
    THIS METHOD IS NOT PART OF WICKET API. DO NOT USE! Sets the flag that determines whether or not this page was created using one of its bookmarkable constructors
    
    Parameters:
    wasCreatedBookmarkable -
  - wasCreatedBookmarkable
```
public final boolean wasCreatedBookmarkable()
```
    Checks if this page was created using one of its bookmarkable constructors
    
    Specified by:
    
    wasCreatedBookmarkable in interface IRequestablePage
    
    Returns:
    true if this page has been created by a bookmarkable URL, false otherwise.
    See Also:
    IRequestablePage.wasCreatedBookmarkable()
  - renderPage
```
public void renderPage()
```
    Description copied from interface: IRequestablePage
    
    Renders the page
    
    Specified by:
    
    renderPage in interface IRequestablePage
    
    See Also:
    IRequestablePage.renderPage()
  - wasRendered
```
public final boolean wasRendered(Component component)
```
    THIS METHOD IS NOT PART OF THE WICKET PUBLIC API. DO NOT CALL.
    
    Parameters:
    component -
    
    Returns:
    if this component was render in this page

Class Page

Field Summary

Fields inherited from class org.apache.wicket.Component

Constructor Summary

Method Summary

Methods inherited from class org.apache.wicket.MarkupContainer

Methods inherited from class org.apache.wicket.Component

Methods inherited from class java.lang.Object

Methods inherited from interface org.apache.wicket.request.component.IRequestableComponent

Methods inherited from interface org.apache.wicket.page.IManageablePage

Methods inherited from interface org.apache.wicket.IQueueRegion

Constructor Detail

Page

Page

Page

Method Detail

getPageParameters

componentRendered

detachModels

internalPrepareForRender

dirty

setFreezePageId

dirty

onInitialize

endComponentRender

getAutoIndex

getId

getPageClass

getSizeInBytes

getStatelessHint

hierarchyAsString

isBookmarkable

isErrorPage

isPageStateless

setNumericId

setStatelessHint

startComponentRender

toString

componentChanged

internalOnModelChanged

onBeforeRender

onAfterRender

onDetach

onRender

getMarkupType

getPageReference

getPageId

getRenderCount

setWasCreatedBookmarkable

wasCreatedBookmarkable

renderPage

wasRendered