org.zkoss.zk.ui.impl
Class PageImpl

java.lang.Object
  org.zkoss.zk.ui.AbstractPage
      org.zkoss.zk.ui.impl.PageImpl

All Implemented Interfaces:

java.io.Serializable, ClassResolver, Scope, IdSpace, Page, PageCtrl

Direct Known Subclasses:

VolatilePage

public class PageImpl
extends AbstractPage
implements java.io.Serializable

An implmentation of Page and PageCtrl. Refer to them for more details.

Note: though PageImpl is serializable, it is designed to work with Web container to enable the serialization of sessions. It is not suggested to serialize and desrialize it directly since many fields might be lost.

On the other hand, it is OK to serialize and deserialize Component.

Implementation Notes:
It is not thread-safe because it is protected by the spec: at most one thread can access a page and all its components at the same time.

Author:

tomyeh

See Also:

Serialized Form

Field Summary

Fields inherited from interface org.zkoss.zk.ui.Page

APPLICATION_SCOPE, DESKTOP_SCOPE, PAGE_SCOPE, REQUEST_SCOPE, SESSION_SCOPE

Constructor Summary

PageImpl(LanguageDefinition langdef, ComponentDefinitionMap compdefs, java.lang.String path, java.lang.String zslang)
Constructs a page without page definition and richlet.

PageImpl(Page ref)
Constructs a page with another page as instance

PageImpl(PageDefinition pgdef)
Constructs a page by giving the page definition.

PageImpl(Richlet richlet, java.lang.String path)
Constructs a page by specifying a richlet.

Method Summary

void	addAfterHeadTags(java.lang.String tags) Adds the tags that will be generated inside the head element and after ZK's default tags.
void	addBeforeHeadTags(java.lang.String tags) Adds the tags that will be generated inside the head element and before ZK's default tags.
boolean	addClassResolver(ClassResolver resolver) Adds a class resolver to this page.
void	addDeferredZScript(Component parent, ZScript zscript) Adds a deferred zscript.
boolean	addEventListener(java.lang.String evtnm, EventListener<? extends Event> listener) Adds an event listener to specified event for all components in this page.
boolean	addFunctionMapper(FunctionMapper mapper) Adds the function mapper in addition to the current one.
boolean	addScopeListener(ScopeListener listener) Adds a listener to listen whether this scope is changed.
boolean	addVariableResolver(VariableResolver resolver) Adds a variable resolver that will be used to resolve a variable by Page.getXelVariable(java.lang.String).
void	destroy() Called when this page is about to be detroyed.
java.lang.String	getAfterHeadTags() Returns the tags that shall be generated inside the head element and after ZK's default tags (never null).
java.lang.Object	getAttribute(java.lang.String name) Returns the value of the specified attribute associated with this page.
java.lang.Object	getAttribute(java.lang.String name, boolean recurse) Returns the custom attribute associated with this object.
java.lang.Object	getAttribute(java.lang.String name, int scope) Returns the value of the specified custom attribute in the specified scope.
java.lang.Object	getAttributeOrFellow(java.lang.String name, boolean recurse) Returns the custom attribute associated with this page, or the fellow of this page; or null if no found.
java.util.Map<java.lang.String,java.lang.Object>	getAttributes() Returns all custom attributes associated with this page.
java.util.Map<java.lang.String,java.lang.Object>	getAttributes(int scope) Returns all custom attributes of the specified scope.
java.lang.Boolean	getAutomaticTimeout() Returns whether to automatically redirect to the timeout URI.
java.lang.String	getBeforeHeadTags() Returns the tags that shall be generated inside the head element and before ZK's default tags (never null).
java.lang.Boolean	getCacheable() Returns if the client can cache the rendered result, or null to use the device default.
ComponentDefinition	getComponentDefinition(java.lang.Class<? extends Component> cls, boolean recurse) Returns the component definition of the specified class, or null if not found.
ComponentDefinition	getComponentDefinition(java.lang.String name, boolean recurse) Returns the component definition of the specified name, or null if not found.
ComponentDefinitionMap	getComponentDefinitionMap() Returns the map of component definitions (never null).
java.lang.String	getContentType() Returns the content type, or null to use the device default.
Desktop	getDesktop() Returns the desktop that this page belongs to.
java.lang.String	getDocType() Returns the doc type (<!
java.lang.Iterable<EventListener<? extends Event>>	getEventListeners(java.lang.String evtnm) Returns an iterable collection of the event listeners for the given event.
java.lang.Class<? extends ExpressionFactory>	getExpressionFactoryClass() Returns the implementation of the expression factory that is used by this page, or null if Configuration.getExpressionFactoryClass() is used.
java.lang.String	getFirstLine() Returns the first line to be generated to the output, or null if nothing to generate.
FunctionMapper	getFunctionMapper() Returns the function mapper for resolving XEL functions, or null if not available.
java.lang.String	getId() Returns ID which is unique in the request (never null).
Interpreter	getInterpreter(java.lang.String zslang) Returns the interpreter of the specified scripting language.
LanguageDefinition	getLanguageDefinition() Returns the language definition that this page belongs to (never null).
java.util.Iterator<EventListener<? extends Event>>	getListenerIterator(java.lang.String evtnm) Deprecated. As of release 6.0, replaced with getEventListeners(java.lang.String).
java.util.Collection<Interpreter>	getLoadedInterpreters() Returns all loaded interpreters.
Component	getOwner() Returns the owner of this page, or null if it is not owned by any component.
java.lang.String	getRequestPath() Returns the request path of this page, or "" if not available.
java.util.Collection<java.lang.Object[]>	getResponseHeaders() Returns a readonly collection of response headers (never null).
java.lang.String	getRootAttributes() Returns the attributes of the root element declared in this page (never null).
java.lang.String	getStyle() Returns the CSS style of this page, or empty if not specified.
java.lang.String	getTitle() Returns the title of the desktop this page belongs to (and evaluate it if it contains an expression).
java.lang.String	getUuid() Returns UUID (universal unique ID) which is unquie in the whole session.
java.lang.String	getWidgetClass() Returns the widget class of this page, or null to use the device default.
java.lang.Object	getXelVariable(java.lang.String name) Returns a variable that is visible to XEL expressions.
java.lang.Object	getXelVariable(XelContext ctx, java.lang.Object base, java.lang.Object name, boolean ignoreExec) Returns a vairable that is visible to XEL expressions.
java.lang.Class<?>	getZScriptClass(java.lang.String clsnm) Returns the class of the specified name by searching the classes defined in the loaded interpreters (Page.getLoadedInterpreters()).
Function	getZScriptFunction(Component comp, java.lang.String name, java.lang.Class[] argTypes) Returns the function of the specified name by searching the logical scope of the specified component in all the loaded interpreters.
Function	getZScriptFunction(java.lang.String name, java.lang.Class[] argTypes) Returns the function of the specified name by searching the loaded interpreters.
java.lang.String	getZScriptLanguage() Returns the default scripting language which is assumed when a zscript element doesn't specify any language.
java.lang.Object	getZScriptVariable(Component comp, java.lang.String name) Returns the value of the variable of the specified name by searching the logical scope of the specified component in all the loaded interpreters, if any.
java.lang.Object	getZScriptVariable(java.lang.String name) Returns the value of the variable of the specified name by searching the loaded interpreters, if any.
boolean	hasAttribute(java.lang.String name) Returns if an attribute exists.
boolean	hasAttribute(java.lang.String name, boolean recurse) Returns if a custom attribute is associated with this object.
boolean	hasAttribute(java.lang.String name, int scope) Returns if an attribute exists.
boolean	hasAttributeOrFellow(java.lang.String name, boolean recurse) Returns if a custom attribute is associated with this page, or a fellow of this page.
boolean	hasFunctionMapper(FunctionMapper mapper) Returns if the specified function mapper has been registered
boolean	hasVariableResolver(VariableResolver resolver) Returns if the specified variable resolver has been registered
protected void	init() Initialized the page when contructed or deserialized.
void	init(PageConfig config) Initializes this page by assigning the info provided by the specified PageConfig, and then adds it to a desktop (by use of Execution.getDesktop()).
void	interpret(java.lang.String zslang, java.lang.String script, Scope scope) Interprets a script in the sepcified scripting language in the context of the specified scope.
void	invalidate() Invalidates this page to cause all components to redraw.
boolean	isAlive() Returns whether the desktop is still alive.
boolean	isComplete() Returns if this page is a complete page.
boolean	isListenerAvailable(java.lang.String evtnm) Returns whether the event listener is available.
void	preInit() Pre-initializes this page.
void	redraw(java.io.Writer out) Redraws the whole page into the specified output.
java.lang.Object	removeAttribute(java.lang.String name) Removes the specified attribute custom associated with the page.
java.lang.Object	removeAttribute(java.lang.String name, boolean recurse) Removes the custom attribute associated with this scope.
java.lang.Object	removeAttribute(java.lang.String name, int scope) Removes the specified custom attribute in the specified scope.
boolean	removeEventListener(java.lang.String evtnm, EventListener<? extends Event> listener) Removes an event listener.
boolean	removeFunctionMapper(FunctionMapper mapper) Removes a function mapper that was added by Page.addFunctionMapper(org.zkoss.xel.FunctionMapper).
boolean	removeScopeListener(ScopeListener listener) Removes a change listener from this scope.
boolean	removeVariableResolver(VariableResolver resolver) Removes a variable resolver that was added by Page.addVariableResolver(org.zkoss.xel.VariableResolver).
java.lang.Class<?>	resolveClass(java.lang.String clsnm) Resolves the class of the specified name.
void	sessionDidActivate(Desktop desktop) Notification that the session, which owns this page, has just been activated (aka., deserialized).
void	sessionWillPassivate(Desktop desktop) Notification that the session, which owns this page, is about to be passivated (aka., serialized).
java.lang.Object	setAttribute(java.lang.String name, java.lang.Object value) Sets the value of the specified custom attribute associated with this page.
java.lang.Object	setAttribute(java.lang.String name, java.lang.Object value, boolean recurse) Sets the custom attribute associated with this scope, or the parent scope.
java.lang.Object	setAttribute(java.lang.String name, java.lang.Object value, int scope) Sets the value of the specified custom attribute in the specified scope.
void	setAutomaticTimeout(java.lang.Boolean autoTimeout) Sets whether to automatically redirect to the timeout URI.
void	setCacheable(java.lang.Boolean cacheable) Sets if the client can cache the rendered result.
void	setComplete(boolean complete) Sets if the page is a complete page.
void	setContentType(java.lang.String contentType) Sets the content type.
void	setDocType(java.lang.String docType) Sets the doc type (<!
void	setExpressionFactoryClass(java.lang.Class<? extends ExpressionFactory> expfcls) Sets the implementation of the expression factory that is used by this page.
void	setFirstLine(java.lang.String firstLine) Sets the first line to be generated to the output.
void	setId(java.lang.String id) Sets the identifier of this page.
void	setOwner(Component comp) Sets the owner of this page.
void	setRootAttributes(java.lang.String rootAttrs) Set the attributes of the root element declared in this page Default: "".
void	setStyle(java.lang.String style) Sets the CSS style of this page.
void	setTitle(java.lang.String title) Sets the title of the desktop this page belongs to (it might contain an expression).
void	setWidgetClass(java.lang.String wgtcls) Sets the widget class of this page.
void	setZScriptLanguage(java.lang.String zslang) Sets the defafult scripting language which will be assumed if a zscript element doesn't specify any language.
java.lang.String	toString()

Methods inherited from class org.zkoss.zk.ui.AbstractPage

getFellow, getFellow, getFellowIfAny, getFellowIfAny, getFellows, getFirstRoot, getLastRoot, getRoots, hasFellow, hasFellow, removeComponents

Methods inherited from class java.lang.Object

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

Constructor Detail

PageImpl

public PageImpl(PageDefinition pgdef)

Constructs a page by giving the page definition.

Note: when a page is constructed, it doesn't belong to a desktop yet. Caller has to invoke init() to complete the creation of a page. Why two phase? Contructor could be called before execution is activated, but init() must be called in an execution.

Also note that getId() and getTitle() are not ready until init() is called.

Parameters:

pgdef - the page definition (never null).

PageImpl

public PageImpl(LanguageDefinition langdef,
                ComponentDefinitionMap compdefs,
                java.lang.String path,
                java.lang.String zslang)

Constructs a page without page definition and richlet.

Parameters:

langdef - the language definition (never null)

compdefs - the component definition map. If null, an empty map is assumed.

path - the request path. If null, empty is assumed.

zslang - the zscript language. If null, "Java" is assumed.

PageImpl

public PageImpl(Page ref)

Constructs a page with another page as instance

Since:

6.0.0

PageImpl

public PageImpl(Richlet richlet,
                java.lang.String path)

Constructs a page by specifying a richlet.

Note: when a page is constructed, it doesn't belong to a desktop yet. Caller has to invoke init() to complete the creation of a page.

Also note that getId() and getTitle() are not ready until init() is called.

Parameters:

richlet - the richlet to serve this page.

path - the request path, or null if not available

Method Detail

init

protected void init()

Initialized the page when contructed or deserialized.

getFunctionMapper

public final FunctionMapper getFunctionMapper()

Description copied from interface: Page

Returns the function mapper for resolving XEL functions, or null if not available. The function mapper represents all function mappers being added.

Specified by:

getFunctionMapper in interface Page

addFunctionMapper

public boolean addFunctionMapper(FunctionMapper mapper)

Description copied from interface: Page

Adds the function mapper in addition to the current one.

The new added function mapper has the higher priority. Page.getFunctionMapper() will return the new

Specified by:

addFunctionMapper in interface Page

Parameters:

mapper - the new function mapper (null to ignore).

removeFunctionMapper

public boolean removeFunctionMapper(FunctionMapper mapper)

Description copied from interface: Page

Removes a function mapper that was added by Page.addFunctionMapper(org.zkoss.xel.FunctionMapper).

Specified by:

removeFunctionMapper in interface Page

Returns:

false if the mapper is not added before.

hasFunctionMapper

public boolean hasFunctionMapper(FunctionMapper mapper)

Description copied from interface: Page

Returns if the specified function mapper has been registered

Specified by:

hasFunctionMapper in interface Page

See Also:

Page.addFunctionMapper(org.zkoss.xel.FunctionMapper)

getRequestPath

public java.lang.String getRequestPath()

Description copied from interface: Page

Returns the request path of this page, or "" if not available.

It is the same as the servlet path (javax.servlet.http.HttpServletRequest's getServletPath), if ZK is running at a servlet container.

Note: Desktop.getRequestPath() returns the request path that causes the desktop to create. And, there might be multiple pages in the same desktop.

Specified by:

getRequestPath in interface Page

See Also:

Execution.getContextPath(), Desktop.getRequestPath()

getId

public final java.lang.String getId()

Description copied from interface: Page

Returns ID which is unique in the request (never null).

Note: it returns null when Initiator.doInit(org.zkoss.zk.ui.Page, java.util.Map) is called.

Specified by:

getId in interface Page

getUuid

public final java.lang.String getUuid()

Description copied from interface: Page

Returns UUID (universal unique ID) which is unquie in the whole session. The UUID is generated automatically and immutable.

It is mainly used for communication between client and server and you rarely need to access it.

Specified by:

getUuid in interface Page

setId

public void setId(java.lang.String id)

Description copied from interface: Page

Sets the identifier of this page.

Note: you can change the page's ID only in Initiator.doInit(org.zkoss.zk.ui.Page, java.util.Map) or ExecutionInit.init(org.zkoss.zk.ui.Execution, org.zkoss.zk.ui.Execution). Once the page is initialized (by PageCtrl.init(org.zkoss.zk.ui.sys.PageConfig)), calling this method will cause an exception.

Specified by:

setId in interface Page

getTitle

public java.lang.String getTitle()

Description copied from interface: Page

Returns the title of the desktop this page belongs to (and evaluate it if it contains an expression).

Default: "".

Specified by:

getTitle in interface Page

setTitle

public void setTitle(java.lang.String title)

Description copied from interface: Page

Sets the title of the desktop this page belongs to (it might contain an expression).

Specified by:

setTitle in interface Page

getStyle

public java.lang.String getStyle()

Description copied from interface: Page

Returns the CSS style of this page, or empty if not specified.

Specified by:

getStyle in interface Page

setStyle

public void setStyle(java.lang.String style)

Description copied from interface: Page

Sets the CSS style of this page.

Note: Unlike Page.setTitle(java.lang.String), you can change the style only in the lifecycle of the loading page.

Specified by:

setStyle in interface Page

getAttributes

public java.util.Map<java.lang.String,java.lang.Object> getAttributes(int scope)

Description copied from interface: Page

Returns all custom attributes of the specified scope. You could reference them directly, or by use of componentScope, spaceScope, pageScope, requestScope and desktopScope in zscript and EL.

If scope is Page.PAGE_SCOPE, it means custom attributes shared by components from the same page as this one's.

If scope is Page.DESKTOP_SCOPE, it means custom attributes shared by components from the same desktopas this one's.

Specified by:

getAttributes in interface Page

Parameters:

scope - one of Page.APPLICATION_SCOPE, Page.SESSION_SCOPE, Page.PAGE_SCOPE, Page.REQUEST_SCOPE or Page.DESKTOP_SCOPE.

getAttribute

public java.lang.Object getAttribute(java.lang.String name,
                                     int scope)

Description copied from interface: Page

Returns the value of the specified custom attribute in the specified scope.

If scope is Page.PAGE_SCOPE, it means custom attributes shared by components from the same page as this one's.

If scope is Page.DESKTOP_SCOPE, it means custom attributes shared by components from the same desktopas this one's.

Specified by:

getAttribute in interface Page

scope - one of Page.APPLICATION_SCOPE, Page.SESSION_SCOPE, Page.PAGE_SCOPE, Page.REQUEST_SCOPE or Page.DESKTOP_SCOPE.

hasAttribute

public boolean hasAttribute(java.lang.String name,
                            int scope)

Description copied from interface: Page

Returns if an attribute exists.

Notice that null is a valid value, so you need this method to really know if an atribute is defined.

Specified by:

hasAttribute in interface Page

setAttribute

public java.lang.Object setAttribute(java.lang.String name,
                                     java.lang.Object value,
                                     int scope)

Description copied from interface: Page

Sets the value of the specified custom attribute in the specified scope.

If scope is Page.PAGE_SCOPE, it means custom attributes shared by components from the same page as this one's.

If scope is Page.DESKTOP_SCOPE, it means custom attributes shared by components from the same desktopas this one's.

Specified by:

setAttribute in interface Page

scope - one of Page.APPLICATION_SCOPE, Page.SESSION_SCOPE, Page.PAGE_SCOPE, Page.REQUEST_SCOPE or Page.DESKTOP_SCOPE.

removeAttribute

public java.lang.Object removeAttribute(java.lang.String name,
                                        int scope)

Description copied from interface: Page

Removes the specified custom attribute in the specified scope.

If scope is Page.PAGE_SCOPE, it means custom attributes shared by components from the same page as this one's.

If scope is Page.DESKTOP_SCOPE, it means custom attributes shared by components from the same desktopas this one's.

Specified by:

removeAttribute in interface Page

scope - one of Page.APPLICATION_SCOPE, Page.SESSION_SCOPE, Page.PAGE_SCOPE, Page.REQUEST_SCOPE or Page.DESKTOP_SCOPE.

getAttributes

public java.util.Map<java.lang.String,java.lang.Object> getAttributes()

Description copied from interface: Page

Returns all custom attributes associated with this page.

Specified by:

getAttributes in interface Scope

Specified by:

getAttributes in interface Page

getAttribute

public java.lang.Object getAttribute(java.lang.String name)

Description copied from interface: Page

Returns the value of the specified attribute associated with this page.

Specified by:

getAttribute in interface Scope

Specified by:

getAttribute in interface Page

hasAttribute

public boolean hasAttribute(java.lang.String name)

Description copied from interface: Page

Returns if an attribute exists.

Notice that null is a valid value, so you need this method to really know if an atribute is defined.

Specified by:

hasAttribute in interface Scope

Specified by:

hasAttribute in interface Page

setAttribute

public java.lang.Object setAttribute(java.lang.String name,
                                     java.lang.Object value)

Description copied from interface: Page

Sets the value of the specified custom attribute associated with this page.

Specified by:

setAttribute in interface Scope

Specified by:

setAttribute in interface Page

value - the value.

Returns:

the previous value associated with the attribute, if any

removeAttribute

public java.lang.Object removeAttribute(java.lang.String name)

Description copied from interface: Page

Removes the specified attribute custom associated with the page.

Specified by:

removeAttribute in interface Scope

Specified by:

removeAttribute in interface Page

Returns:

the previous value associated with the attribute, if any,

getAttribute

public java.lang.Object getAttribute(java.lang.String name,
                                     boolean recurse)

Description copied from interface: Scope

Returns the custom attribute associated with this object.

Specified by:

getAttribute in interface Scope

recurse - whether to search its ancestor scope. If true and the current scope doen't define the attribute, it searches up its ancestor to see any of them has defined the specified attribute.

hasAttribute

public boolean hasAttribute(java.lang.String name,
                            boolean recurse)

Description copied from interface: Scope

Returns if a custom attribute is associated with this object.

Notice that null is a valid value, so you can tell if an attribute is assoicated by examining the return value of Scope.getAttribute(java.lang.String).

Specified by:

hasAttribute in interface Scope

recurse - whether to search its ancestor scope. If true and the current scope doen't define the attribute, it searches up its ancestor to see any of them has defined the specified attribute.

setAttribute

public java.lang.Object setAttribute(java.lang.String name,
                                     java.lang.Object value,
                                     boolean recurse)

Description copied from interface: Scope

Sets the custom attribute associated with this scope, or the parent scope.

Specified by:

setAttribute in interface Scope

recurse - whether to look up the parent scope for the existence of the attribute.
If recurse is true and the attribute is defined in one of its ancestor (including page), the attribute is replaced. Otherwise, it is the same as Scope.setAttribute(String,Object).

removeAttribute

public java.lang.Object removeAttribute(java.lang.String name,
                                        boolean recurse)

Description copied from interface: Scope

Removes the custom attribute associated with this scope.

Specified by:

removeAttribute in interface Scope

recurse - whether to look up the parent scope for the existence of the attribute.
If recurse is true and the attribute is defined in one of its ancestor (including page), the attribute is removed. Otherwise, it is the same as Scope.removeAttribute(String).

getAttributeOrFellow

public java.lang.Object getAttributeOrFellow(java.lang.String name,
                                             boolean recurse)

Description copied from interface: Page

Returns the custom attribute associated with this page, or the fellow of this page; or null if no found.

Notice that this method will NOT check for any variable defined in the variable resolver (Page.addVariableResolver(org.zkoss.xel.VariableResolver)). You have to invoke Page.getXelVariable(XelContext,Object,Object,boolean) or Page.getXelVariable(String) manually.

Specified by:

getAttributeOrFellow in interface Page

recurse - whether to look up the desktop/session for the existence of the attribute.

hasAttributeOrFellow

public boolean hasAttributeOrFellow(java.lang.String name,
                                    boolean recurse)

Description copied from interface: Page

Returns if a custom attribute is associated with this page, or a fellow of this page.

Notice that this method will NOT check for any variable defined in the variable resolver (Page.addVariableResolver(org.zkoss.xel.VariableResolver)). You have to invoke Page.getXelVariable(XelContext,Object,Object,boolean) or Page.getXelVariable(String) manually.

Specified by:

hasAttributeOrFellow in interface Page

recurse - whether to look up the desktop/session for the existence of the attribute.

addScopeListener

public boolean addScopeListener(ScopeListener listener)

Description copied from interface: Scope

Adds a listener to listen whether this scope is changed. The listener is called when a custom attribute is added, removed, or the parent is changed.

Specified by:

addScopeListener in interface Scope

Returns:

wether the listener is added successfully. Note: if the resolver was added before, it won't be added again and this method returns false.

removeScopeListener

public boolean removeScopeListener(ScopeListener listener)

Description copied from interface: Scope

Removes a change listener from this scope.

Specified by:

removeScopeListener in interface Scope

Returns:

false if listener is not added before.

invalidate

public void invalidate()

Description copied from interface: Page

Invalidates this page to cause all components to redraw.

Specified by:

invalidate in interface Page

addClassResolver

public boolean addClassResolver(ClassResolver resolver)

Description copied from interface: Page

Adds a class resolver to this page.

Specified by:

addClassResolver in interface Page

Parameters:

resolver - the class resolver to be added. Currently it supports only ImportedClassResolver.

See Also:

Page.resolveClass(java.lang.String)

resolveClass

public java.lang.Class<?> resolveClass(java.lang.String clsnm)
                                throws java.lang.ClassNotFoundException

Description copied from interface: Page

Resolves the class of the specified name. It first looks at ClassResolver (registered with Page.addClassResolver(org.zkoss.lang.ClassResolver)). If not found, it looks at the current thread's class loader. And then, it looks for classes defined in any loaded interpreters (Page.getLoadedInterpreters()).

Specified by:

resolveClass in interface ClassResolver

Specified by:

resolveClass in interface Page

Parameters:

clsnm - the class name. It does not have to be a fully qualified name (i.e., it could have no package name), if the class is imported by use of the import directive (such as <?import class="com.foo.*"?>).

Throws:

java.lang.ClassNotFoundException - if the class is not found.

getZScriptClass

public java.lang.Class<?> getZScriptClass(java.lang.String clsnm)

Description copied from interface: Page

Returns the class of the specified name by searching the classes defined in the loaded interpreters (Page.getLoadedInterpreters()).

Note that: since ZK 6, this method will not search the current thread's class loader. In other words, you'd like to look for a class from a given page, use Page.resolveClass(java.lang.String) instead.

Also notice that it won't throw an exception if not found. Rather, it returns null.

Specified by:

getZScriptClass in interface Page

Parameters:

clsnm - the fully qualified class name. Unlike Page.resolveClass(java.lang.String), this method does not support the imported class (by Page.addClassResolver(org.zkoss.lang.ClassResolver)).

Returns:

the class, or null if not found

See Also:

Page.resolveClass(java.lang.String), Page.getLoadedInterpreters()

getZScriptFunction

public Function getZScriptFunction(java.lang.String name,
                                   java.lang.Class[] argTypes)

Description copied from interface: Page

Returns the function of the specified name by searching the loaded interpreters.

Specified by:

getZScriptFunction in interface Page

Returns:

the method, or null if not found

See Also:

Page.getLoadedInterpreters()

getZScriptFunction

public Function getZScriptFunction(Component comp,
                                   java.lang.String name,
                                   java.lang.Class[] argTypes)

Description copied from interface: Page

Returns the function of the specified name by searching the logical scope of the specified component in all the loaded interpreters.

Specified by:

getZScriptFunction in interface Page

Parameters:

comp - the component to start the search. If null, this method searches only the page's attributes. In other words, if comp is null, this method is the same as Page.getZScriptFunction(String, Class[]).

getZScriptVariable

public java.lang.Object getZScriptVariable(java.lang.String name)

Description copied from interface: Page

Returns the value of the variable of the specified name by searching the loaded interpreters, if any.

Specified by:

getZScriptVariable in interface Page

Returns:

the value of the variable, or null if not found

See Also:

Page.getLoadedInterpreters()

getZScriptVariable

public java.lang.Object getZScriptVariable(Component comp,
                                           java.lang.String name)

Description copied from interface: Page

Returns the value of the variable of the specified name by searching the logical scope of the specified component in all the loaded interpreters, if any.

Specified by:

getZScriptVariable in interface Page

Parameters:

comp - the component as the context to look for the variable defined in an interpreter. If null, the context is assumed to be this page.

getXelVariable

public java.lang.Object getXelVariable(java.lang.String name)

Description copied from interface: Page

Returns a variable that is visible to XEL expressions. It is a shortcut of getXelVariable(null, null, name, false).

This method is mainly used to access special variable, such as request parameters (if this page is requested by HTTP).

Specified by:

getXelVariable in interface Page

See Also:

Page.getXelVariable(XelContext, Object, Object, boolean)

getXelVariable

public java.lang.Object getXelVariable(XelContext ctx,
                                       java.lang.Object base,
                                       java.lang.Object name,
                                       boolean ignoreExec)

Description copied from interface: Page

Returns a vairable that is visible to XEL expressions.

Unlike Page.getXelVariable(String), this method can utilitize VariableResolverX if you'd like to retrieve a property of another object.

Specified by:

getXelVariable in interface Page

Parameters:

ctx - the XEL context

base - the base object. If null, it looks for a top-level variable. If not null, it looks for a member of the base object (such as getter).

name - the property to retrieve.

ignoreExec - whether to ignore the current execution (Execution.getVariableResolver(). If true, it invokes only the variable resolvers define in this page (Page.addVariableResolver(org.zkoss.xel.VariableResolver)). If false, it will first check the execution, so the implicit objects such as page and desktop will be resolved.

See Also:

Page.getXelVariable(String)

addVariableResolver

public boolean addVariableResolver(VariableResolver resolver)

Description copied from interface: Page

Adds a variable resolver that will be used to resolve a variable by Page.getXelVariable(java.lang.String).

The new added variable resolver has the higher priority.

Note: the variables resolver by the specified resolver are accessible to both zscript and EL expressions.

Specified by:

addVariableResolver in interface Page

Returns:

wether the resolver is added successfully. Note: if the resolver was added before, it won't be added again and this method returns false.

removeVariableResolver

public boolean removeVariableResolver(VariableResolver resolver)

Description copied from interface: Page

Removes a variable resolver that was added by Page.addVariableResolver(org.zkoss.xel.VariableResolver).

Specified by:

removeVariableResolver in interface Page

Returns:

false if the resolver is not added before.

hasVariableResolver

public boolean hasVariableResolver(VariableResolver resolver)

Description copied from interface: Page

Returns if the specified variable resolver has been registered

Specified by:

hasVariableResolver in interface Page

See Also:

Page.addVariableResolver(org.zkoss.xel.VariableResolver)

addEventListener

public boolean addEventListener(java.lang.String evtnm,
                                EventListener<? extends Event> listener)

Description copied from interface: Page

Adds an event listener to specified event for all components in this page.

Due to performance consideration, unlike Component.addEventListener(int, java.lang.String, org.zkoss.zk.ui.event.EventListener), all event listeners for the page are deferrable, no matter Deferrable is implemented or not.

Version Difference

ZK 5.0 and earlier, the second registration is ignored if an event listener has been registered twice. However, since 6.0.0 and later, it won't be ignored. If a listener has been registered multiple times, it will be invoked multiple times.

If you prefer to ignore the second registration, you could specify a library property called "org.zkoss.zk.ui.EventListener.duplicateIgnored" to true.

Specified by:

addEventListener in interface Page

Parameters:

evtnm - what event to listen (never null)

Returns:

whether the listener is added successfully

See Also:

Component.addEventListener(int, java.lang.String, org.zkoss.zk.ui.event.EventListener)

removeEventListener

public boolean removeEventListener(java.lang.String evtnm,
                                   EventListener<? extends Event> listener)

Description copied from interface: Page

Removes an event listener.

Specified by:

removeEventListener in interface Page

Returns:

whether the listener is removed; false if it was never added.

isComplete

public boolean isComplete()

Description copied from interface: Page

Returns if this page is a complete page. By complete we mean the page has everything that the client expects. For example, for HTML browsers, the page will generate the HTML, HEAD and BODY tags.

It is meaningful only if it is the top-level page (i.e., not included by the include component).

Default: false. It means ZK loader will enclose the page content with HTML/HEAD/BODY if necessary (such as not included by other Servlet).

If you have a page that has a complete HTML page and it is included by other page, you have to specify the complete flag to be true.

Specified by:

isComplete in interface Page

setComplete

public void setComplete(boolean complete)

Description copied from interface: Page

Sets if the page is a complete page.

Default: false. It means a page is complete if and only if it is not included by other page.

Specified by:

setComplete in interface Page

Parameters:

complete - whether the page is complete. If true, this page is assumed to be complete no matter it is included or not. If false, this page is assumed to be complete if it is not included by other page.

See Also:

Page.isComplete()

preInit

public void preInit()

Description copied from interface: PageCtrl

Pre-initializes this page. It initializes Page.getDesktop(), but it doesn't add this page to the desktop yet (which is done by PageCtrl.init(org.zkoss.zk.ui.sys.PageConfig)).

Note: it is called before Initiator.doInit(org.zkoss.zk.ui.Page, java.util.Map) and PageCtrl.init(org.zkoss.zk.ui.sys.PageConfig). Since Page.getDesktop() is initialized in this method, it is OK to create components in Initiator.doInit(org.zkoss.zk.ui.Page, java.util.Map).

Specified by:

preInit in interface PageCtrl

init

public void init(PageConfig config)

Description copied from interface: PageCtrl

Initializes this page by assigning the info provided by the specified PageConfig, and then adds it to a desktop (by use of Execution.getDesktop()).

Note: this method is called after PageCtrl.preInit() and Initiator.doInit(org.zkoss.zk.ui.Page, java.util.Map).

This method shall be called only after the current execution is activated.

Specified by:

init in interface PageCtrl

Parameters:

config - the info about how to initialize this page

destroy

public void destroy()

Description copied from interface: PageCtrl

Called when this page is about to be detroyed. It is called by desktop, after removing it from the desktop.

Specified by:

destroy in interface PageCtrl

Overrides:

destroy in class AbstractPage

isAlive

public boolean isAlive()

Description copied from interface: Page

Returns whether the desktop is still alive. It returns false once it is destroyed.

Specified by:

isAlive in interface Page

See Also:

PageCtrl.destroy()

getBeforeHeadTags

public java.lang.String getBeforeHeadTags()

Description copied from interface: PageCtrl

Returns the tags that shall be generated inside the head element and before ZK's default tags (never null). For example, it might consist of <meta> and <link>.

Since it is generated before ZK's default tags (such as CSS and JS), it cannot override ZK's default behaviors.

Specified by:

getBeforeHeadTags in interface PageCtrl

See Also:

PageCtrl.getAfterHeadTags()

getAfterHeadTags

public java.lang.String getAfterHeadTags()

Description copied from interface: PageCtrl

Returns the tags that shall be generated inside the head element and after ZK's default tags (never null). For example, it might consist of <meta> and <link>.

Since it is generated after ZK's default tags (such as CSS and JS), it could override ZK's default behaviors.

Specified by:

getAfterHeadTags in interface PageCtrl

See Also:

PageCtrl.getBeforeHeadTags()

addBeforeHeadTags

public void addBeforeHeadTags(java.lang.String tags)

Description copied from interface: PageCtrl

Adds the tags that will be generated inside the head element and before ZK's default tags. For example,

((PageCtrl)page).addBeforeHeadTags("");

You could specify the link, meta and script directive to have the similar result.

Specified by:

addBeforeHeadTags in interface PageCtrl

addAfterHeadTags

public void addAfterHeadTags(java.lang.String tags)

Description copied from interface: PageCtrl

Adds the tags that will be generated inside the head element and after ZK's default tags. For example,

((PageCtrl)page).addBeforeHeadTags("");

You could specify the link, meta and script directive to have the similar result.

Specified by:

addAfterHeadTags in interface PageCtrl

getResponseHeaders

public java.util.Collection<java.lang.Object[]> getResponseHeaders()

Description copied from interface: PageCtrl

Returns a readonly collection of response headers (never null). The entry is a three-element object array. The first element is the header name. The second element of the array is the value which is an instance of Date or String (and never null). The third element indicates whether to add (rather than set) theader. It is an instance of Boolean (and never null).

Specified by:

getResponseHeaders in interface PageCtrl

getRootAttributes

public java.lang.String getRootAttributes()

Description copied from interface: PageCtrl

Returns the attributes of the root element declared in this page (never null). An empty string is returned if no special attribute is declared.

For HTML, the root element is the HTML element.

Specified by:

getRootAttributes in interface PageCtrl

setRootAttributes

public void setRootAttributes(java.lang.String rootAttrs)

Description copied from interface: PageCtrl

Set the attributes of the root element declared in this page

Default: "".

Specified by:

setRootAttributes in interface PageCtrl

getContentType

public java.lang.String getContentType()

Description copied from interface: PageCtrl

Returns the content type, or null to use the device default.

Specified by:

getContentType in interface PageCtrl

setContentType

public void setContentType(java.lang.String contentType)

Description copied from interface: PageCtrl

Sets the content type.

Specified by:

setContentType in interface PageCtrl

getWidgetClass

public java.lang.String getWidgetClass()

Description copied from interface: PageCtrl

Returns the widget class of this page, or null to use the device default.

Specified by:

getWidgetClass in interface PageCtrl

setWidgetClass

public void setWidgetClass(java.lang.String wgtcls)

Description copied from interface: PageCtrl

Sets the widget class of this page.

Specified by:

setWidgetClass in interface PageCtrl

Parameters:

wgtcls - the widget class. The device default is assumed if wgtcls is null or empty.

getDocType

public java.lang.String getDocType()

Description copied from interface: PageCtrl

Returns the doc type (<!DOCTYPE>), or null to use the device default.

Specified by:

getDocType in interface PageCtrl

setDocType

public void setDocType(java.lang.String docType)

Description copied from interface: PageCtrl

Sets the doc type (<!DOCTYPE>).

Default: null (i.e., the device default)

Specified by:

setDocType in interface PageCtrl

getFirstLine

public java.lang.String getFirstLine()

Description copied from interface: PageCtrl

Returns the first line to be generated to the output, or null if nothing to generate.

For XML devices, it is usually the xml processing instruction:
<?xml version="1.0" encoding="UTF-8"?>

Specified by:

getFirstLine in interface PageCtrl

setFirstLine

public void setFirstLine(java.lang.String firstLine)

Description copied from interface: PageCtrl

Sets the first line to be generated to the output.

Default: null (i.e., nothing generated)

Specified by:

setFirstLine in interface PageCtrl

getCacheable

public java.lang.Boolean getCacheable()

Description copied from interface: PageCtrl

Returns if the client can cache the rendered result, or null to use the device default.

Specified by:

getCacheable in interface PageCtrl

setCacheable

public void setCacheable(java.lang.Boolean cacheable)

Description copied from interface: PageCtrl

Sets if the client can cache the rendered result.

Default: null (use the device default).

Specified by:

setCacheable in interface PageCtrl

getAutomaticTimeout

public java.lang.Boolean getAutomaticTimeout()

Description copied from interface: PageCtrl

Returns whether to automatically redirect to the timeout URI.

Specified by:

getAutomaticTimeout in interface PageCtrl

See Also:

PageCtrl.setAutomaticTimeout(java.lang.Boolean)

setAutomaticTimeout

public void setAutomaticTimeout(java.lang.Boolean autoTimeout)

Description copied from interface: PageCtrl

Sets whether to automatically redirect to the timeout URI.

Default: null (use the device default).

If it is set to false, it means this page is redirected to the timeout URI when the use takes some action after timeout. In other words, nothing happens if the user does nothing. If it is set to true, it is redirected as soon as timeout, no matter the user takes any action.

Refer to Configuration.setAutomaticTimeout(java.lang.String, boolean) for how to configure the device default (default: false).

Specified by:

setAutomaticTimeout in interface PageCtrl

getDesktop

public final Desktop getDesktop()

Description copied from interface: Page

Returns the desktop that this page belongs to.

Note: it returns null when Initiator.doInit(org.zkoss.zk.ui.Page, java.util.Map) is called.

Specified by:

getDesktop in interface Page

redraw

public void redraw(java.io.Writer out)
            throws java.io.IOException

Description copied from interface: PageCtrl

Redraws the whole page into the specified output.

You could use Attributes.PAGE_REDRAW_CONTROL and/or Attributes.PAGE_RENDERER to control how to render manually.

Specified by:

redraw in interface PageCtrl

Throws:

java.io.IOException

interpret

public void interpret(java.lang.String zslang,
                      java.lang.String script,
                      Scope scope)

Description copied from interface: Page

Interprets a script in the sepcified scripting language in the context of the specified scope.

Specified by:

interpret in interface Page

Parameters:

zslang - the scripting language. If null, Page.getZScriptLanguage() is assumed.

scope - the scope used as the context. Since a component is a scope, you can pass a component as the context. By context we mean the attribute of the scope, its space owner, spacer owner's space owner, page and desktop will be searched. If null, this page is assumed.

getInterpreter

public Interpreter getInterpreter(java.lang.String zslang)

Description copied from interface: Page

Returns the interpreter of the specified scripting language.

The interpreter will be loaded and initialized, if it is not loaded yet.

Specified by:

getInterpreter in interface Page

Parameters:

zslang - the scripting language. If null, Page.getZScriptLanguage() is assumed.

getLoadedInterpreters

public java.util.Collection<Interpreter> getLoadedInterpreters()

Description copied from interface: Page

Returns all loaded interpreters.

Specified by:

getLoadedInterpreters in interface Page

getZScriptLanguage

public java.lang.String getZScriptLanguage()

Description copied from interface: Page

Returns the default scripting language which is assumed when a zscript element doesn't specify any language.

Specified by:

getZScriptLanguage in interface Page

Returns:

the default scripting language, say, Java. Never null.

setZScriptLanguage

public void setZScriptLanguage(java.lang.String zslang)
                        throws InterpreterNotFoundException

Description copied from interface: Page

Sets the defafult scripting language which will be assumed if a zscript element doesn't specify any language.

Specified by:

setZScriptLanguage in interface Page

Throws:

InterpreterNotFoundException - if no such language

addDeferredZScript

public void addDeferredZScript(Component parent,
                               ZScript zscript)

Description copied from interface: PageCtrl

Adds a deferred zscript.

Specified by:

addDeferredZScript in interface PageCtrl

Parameters:

parent - the component that is the parent of zscript (in the ZUML page), or null if it belongs to the page.

zscript - the zscript that shall be evaluated as late as when the interpreter of the same language is being loaded.

isListenerAvailable

public boolean isListenerAvailable(java.lang.String evtnm)

Description copied from interface: Page

Returns whether the event listener is available.

Specified by:

isListenerAvailable in interface Page

getListenerIterator

public java.util.Iterator<EventListener<? extends Event>> getListenerIterator(java.lang.String evtnm)

Deprecated. As of release 6.0, replaced with getEventListeners(java.lang.String).

Specified by:

getListenerIterator in interface Page

getEventListeners

public java.lang.Iterable<EventListener<? extends Event>> getEventListeners(java.lang.String evtnm)

Description copied from interface: Page

Returns an iterable collection of the event listeners for the given event.

Note: it is OK to invoke Page.addEventListener(java.lang.String, org.zkoss.zk.ui.event.EventListener) or Page.removeEventListener(java.lang.String, org.zkoss.zk.ui.event.EventListener) when iterating through the event listeners with the returned collection.

To remove an event listener from the returned iterable collection, you could invoke Iterable.iterator()'s Iterator.remove().

Specified by:

getEventListeners in interface Page

getOwner

public final Component getOwner()

Description copied from interface: PageCtrl

Returns the owner of this page, or null if it is not owned by any component. A page is included by a component. We say it is owned by the component.

Note: the owner, if not null, must implement Includer.

Specified by:

getOwner in interface PageCtrl

setOwner

public final void setOwner(Component comp)

Description copied from interface: PageCtrl

Sets the owner of this page.

Called only internally

Since 5.0.6, the owner must implement Includer.

Specified by:

setOwner in interface PageCtrl

sessionWillPassivate

public void sessionWillPassivate(Desktop desktop)

Description copied from interface: PageCtrl

Notification that the session, which owns this page, is about to be passivated (aka., serialized).

Specified by:

sessionWillPassivate in interface PageCtrl

sessionDidActivate

public void sessionDidActivate(Desktop desktop)

Description copied from interface: PageCtrl

Notification that the session, which owns this page, has just been activated (aka., deserialized).

Specified by:

sessionDidActivate in interface PageCtrl

getLanguageDefinition

public LanguageDefinition getLanguageDefinition()

Description copied from interface: Page

Returns the language definition that this page belongs to (never null).

Specified by:

getLanguageDefinition in interface Page

getComponentDefinitionMap

public ComponentDefinitionMap getComponentDefinitionMap()

Description copied from interface: Page

Returns the map of component definitions (never null).

Note: the map is shared among all instance of the same page definition. Any component definition added (by ComponentDefinitionMap.add(org.zkoss.zk.ui.metainfo.ComponentDefinition)) are visible to all other instances of the same page definition. Thus, it is NOT a good idea to change its content.

Specified by:

getComponentDefinitionMap in interface Page

getComponentDefinition

public ComponentDefinition getComponentDefinition(java.lang.String name,
                                                  boolean recurse)

Description copied from interface: Page

Returns the component definition of the specified name, or null if not found.

Note: unlike LanguageDefinition.getComponentDefinition(java.lang.String), this method doesn't throw ComponentNotFoundException if not found. It just returns null.

Specified by:

getComponentDefinition in interface Page

recurse - whether to look up the component from Page.getLanguageDefinition()

getComponentDefinition

public ComponentDefinition getComponentDefinition(java.lang.Class<? extends Component> cls,
                                                  boolean recurse)

Description copied from interface: Page

Returns the component definition of the specified class, or null if not found.

Note: unlike LanguageDefinition.getComponentDefinition(java.lang.String), this method doesn't throw ComponentNotFoundException if not found. It just returns null.

Specified by:

getComponentDefinition in interface Page

recurse - whether to look up the component from Page.getLanguageDefinition()

getExpressionFactoryClass

public java.lang.Class<? extends ExpressionFactory> getExpressionFactoryClass()

Description copied from interface: Page

Returns the implementation of the expression factory that is used by this page, or null if Configuration.getExpressionFactoryClass() is used.

Default: null.

Specified by:

getExpressionFactoryClass in interface Page

See Also:

Page.setExpressionFactoryClass(java.lang.Class)

setExpressionFactoryClass

public void setExpressionFactoryClass(java.lang.Class<? extends ExpressionFactory> expfcls)

Description copied from interface: Page

Sets the implementation of the expression factory that is used by this page.

Specified by:

setExpressionFactoryClass in interface Page

Parameters:

expfcls - the class that implements ExpressionFactory, If null, Configuration.getExpressionFactoryClass() is used.

See Also:

Page.getExpressionFactoryClass()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object