com.vaadin.client.ui

Class AbstractConnector

java.lang.Object

com.vaadin.client.ui.AbstractConnector

All Implemented Interfaces:

com.google.gwt.event.shared.EventHandler, StateChangeEvent.StateChangeHandler, ServerConnector, Connector, Serializable

Direct Known Subclasses:

AbstractComponentConnector, AbstractExtensionConnector

public abstract class AbstractConnector
extends Object
implements ServerConnector, StateChangeEvent.StateChangeHandler

An abstract implementation of Connector.

Since:

7.0.0

Author:

Vaadin Ltd

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
AbstractConnector()

Method Summary

Modifier and Type	Method and Description
com.google.gwt.event.shared.HandlerRegistration	addStateChangeHandler(StateChangeEvent.StateChangeHandler handler) Adds a handler that is called whenever any part of the state has been updated by the server.
com.google.gwt.event.shared.HandlerRegistration	addStateChangeHandler(String propertyName, StateChangeEvent.StateChangeHandler handler) Adds a handler that is called whenever the given part of the state has been updated by the server.
protected SharedState	createState() Creates a state object with default values for this connector.
void	doInit(String connectorId, ApplicationConnection connection) Called once by the framework to initialize the connector.
protected com.google.gwt.event.shared.HandlerManager	ensureHandlerManager()
void	fireEvent(com.google.gwt.event.shared.GwtEvent<?> event) Sends the given event to all registered handlers.
void	forceStateChange() Force the connector to recheck its state variables as the variables or their meaning might have changed.
List<ServerConnector>	getChildren() Returns the child connectors for this connector (child components and extensions).
ApplicationConnection	getConnection() Gets ApplicationConnection instance that created this connector.
String	getConnectorId() Returns the id for this connector.
ServerConnector	getParent() Returns the parent of this connector.
String	getResourceUrl(String key) Gets the URL for a resource that has been added by the server-side connector using com.vaadin.terminal.AbstractClientConnector#setResource(String, com.vaadin.terminal.Resource) with the same key.
<T extends ClientRpc> Collection<T>	getRpcImplementations(String rpcInterfaceId) For internal use by the framework: returns the registered RPC implementations for an RPC interface identifier.
protected <T extends ServerRpc> T	getRpcProxy(Class<T> rpcInterface) Returns an RPC proxy object which can be used to invoke the RPC method on the server.
SharedState	getState() Returns the shared state object for this connector.
static Type	getStateType(ServerConnector connector)
boolean	hasEventListener(String eventIdentifier) Checks if an event listener has been registered on the server side for the given event identifier.
protected void	init() Called when the connector has been initialized.
boolean	isEnabled() Tests whether the connector is enabled or not.
void	onStateChanged(StateChangeEvent stateChangeEvent) Notifies the event handler that the state has changed.
void	onUnregister() Event called when connector has been unregistered.
protected <T extends ClientRpc> void	registerRpc(Class<T> rpcInterface, T implementation) Registers an implementation for a server to client RPC interface.
void	removeStateChangeHandler(StateChangeEvent.StateChangeHandler handler) Removes a handler that is called whenever any part of the state has been updated by the server.
void	removeStateChangeHandler(String propertyName, StateChangeEvent.StateChangeHandler handler) Removes a handler that is called whenever any part of the state has been updated by the server.
void	setChildren(List<ServerConnector> children) Sets the children for this connector.
void	setParent(ServerConnector parent) Sets the parent for this connector.
protected <T extends ClientRpc> void	unregisterRpc(Class<T> rpcInterface, T implementation) Unregisters an implementation for a server to client RPC interface.
void	updateEnabledState(boolean enabledState)

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractConnector

public AbstractConnector()

Method Detail

getConnection

public final ApplicationConnection getConnection()

Description copied from interface: ServerConnector

Gets ApplicationConnection instance that created this connector.

Specified by:

getConnection in interface ServerConnector

Returns:

The ApplicationConnection as set by ServerConnector.doInit(String, ApplicationConnection)

getConnectorId

public String getConnectorId()

Description copied from interface: Connector

Returns the id for this connector. This is set by the framework and does not change during the lifetime of a connector.

Specified by:

getConnectorId in interface Connector

Returns:

The id for the connector.

doInit

public final void doInit(String connectorId,
                         ApplicationConnection connection)

Called once by the framework to initialize the connector.

Note that the shared state is not yet available when this method is called.

Connector classes should override init() instead of this method.

Specified by:

doInit in interface ServerConnector

init

protected void init()

Called when the connector has been initialized. Override this method to perform initialization of the connector.

registerRpc

protected <T extends ClientRpc> void registerRpc(Class<T> rpcInterface,
                                                 T implementation)

Registers an implementation for a server to client RPC interface. Multiple registrations can be made for a single interface, in which case all of them receive corresponding RPC calls.

Type Parameters:

T - The type of the RPC interface that is being registered

Parameters:

rpcInterface - RPC interface

implementation - implementation that should receive RPC calls

unregisterRpc

protected <T extends ClientRpc> void unregisterRpc(Class<T> rpcInterface,
                                                   T implementation)

Unregisters an implementation for a server to client RPC interface.

Parameters:

rpcInterface - RPC interface

implementation - implementation to unregister

getRpcProxy

protected <T extends ServerRpc> T getRpcProxy(Class<T> rpcInterface)

Returns an RPC proxy object which can be used to invoke the RPC method on the server.

Type Parameters:

T - The type of the ServerRpc interface

Parameters:

rpcInterface - The ServerRpc interface to retrieve a proxy object for

Returns:

A proxy object which can be used to invoke the RPC method on the server.

getRpcImplementations

public <T extends ClientRpc> Collection<T> getRpcImplementations(String rpcInterfaceId)

Description copied from interface: ServerConnector

For internal use by the framework: returns the registered RPC implementations for an RPC interface identifier. TODO interface identifier type or format may change

Specified by:

getRpcImplementations in interface ServerConnector

Parameters:

rpcInterfaceId - RPC interface identifier: fully qualified interface type name

Returns:

RPC interface implementations registered for an RPC interface, not null

fireEvent

public void fireEvent(com.google.gwt.event.shared.GwtEvent<?> event)

Description copied from interface: ServerConnector

Sends the given event to all registered handlers.

Specified by:

fireEvent in interface ServerConnector

Parameters:

event - The event to send.

ensureHandlerManager

protected com.google.gwt.event.shared.HandlerManager ensureHandlerManager()

addStateChangeHandler

public com.google.gwt.event.shared.HandlerRegistration addStateChangeHandler(StateChangeEvent.StateChangeHandler handler)

Description copied from interface: ServerConnector

Adds a handler that is called whenever any part of the state has been updated by the server.

Specified by:

addStateChangeHandler in interface ServerConnector

Parameters:

handler - The handler that should be added.

Returns:

A handler registration reference that can be used to unregister the handler

removeStateChangeHandler

public void removeStateChangeHandler(StateChangeEvent.StateChangeHandler handler)

Description copied from interface: ServerConnector

Removes a handler that is called whenever any part of the state has been updated by the server.

Specified by:

removeStateChangeHandler in interface ServerConnector

Parameters:

handler - The handler that should be removed.

addStateChangeHandler

public com.google.gwt.event.shared.HandlerRegistration addStateChangeHandler(String propertyName,
                                                                             StateChangeEvent.StateChangeHandler handler)

Description copied from interface: ServerConnector

Adds a handler that is called whenever the given part of the state has been updated by the server.

Specified by:

addStateChangeHandler in interface ServerConnector

Parameters:

propertyName - the name of the property for which the handler should be called

handler - The handler that should be added.

Returns:

A handler registration reference that can be used to unregister the handler

removeStateChangeHandler

public void removeStateChangeHandler(String propertyName,
                                     StateChangeEvent.StateChangeHandler handler)

Description copied from interface: ServerConnector

Removes a handler that is called whenever any part of the state has been updated by the server.

Specified by:

removeStateChangeHandler in interface ServerConnector

Parameters:

propertyName - the name of the property for which the handler should be called

handler - The handler that should be removed.

onStateChanged

public void onStateChanged(StateChangeEvent stateChangeEvent)

Description copied from interface: StateChangeEvent.StateChangeHandler

Notifies the event handler that the state has changed.

Specified by:

onStateChanged in interface StateChangeEvent.StateChangeHandler

Parameters:

stateChangeEvent - the state change event with details about the change

onUnregister

public void onUnregister()

Description copied from interface: ServerConnector

Event called when connector has been unregistered.

Specified by:

onUnregister in interface ServerConnector

getState

public SharedState getState()

Returns the shared state object for this connector. Override this method to define the shared state type for your connector.

Specified by:

getState in interface ServerConnector

Returns:

the current shared state (never null)

createState

protected SharedState createState()

Creates a state object with default values for this connector. The created state object must be compatible with the return type of getState(). The default implementation creates a state object using GWT.create() using the defined return type of getState().

Returns:

A new state object

getStateType

public static Type getStateType(ServerConnector connector)

getParent

public ServerConnector getParent()

Description copied from interface: ServerConnector

Returns the parent of this connector. Can be null for only the root connector.

Specified by:

getParent in interface ServerConnector

Specified by:

getParent in interface Connector

Returns:

The parent of this connector, as set by ServerConnector.setParent(ServerConnector).

setParent

public void setParent(ServerConnector parent)

Description copied from interface: ServerConnector

Sets the parent for this connector. This method should only be called by the framework to ensure that the connector hierarchy on the client side and the server side are in sync.

Note that calling this method does not fire a ConnectorHierarchyChangeEvent. The event is fired only when the whole hierarchy has been updated.

Specified by:

setParent in interface ServerConnector

Parameters:

parent - The new parent of the connector

getChildren

public List<ServerConnector> getChildren()

Description copied from interface: ServerConnector

Returns the child connectors for this connector (child components and extensions).

Note that the method HasComponentsConnector.getChildComponents() can be used to obtain the subset of child connectors that correspond to components and not extensions.

Specified by:

getChildren in interface ServerConnector

Returns:

A collection of child connectors (components or extensions) for this connector. An empty collection if there are no children. Never returns null.

setChildren

public void setChildren(List<ServerConnector> children)

Description copied from interface: ServerConnector

Sets the children for this connector. This method should only be called by the framework to ensure that the connector hierarchy on the client side and the server side are in sync.

Note that this method is separate from HasComponentsConnector.setChildComponents(List) and takes both extensions and child components. Both methods are called separately by the framework if the connector can have child components.

Specified by:

setChildren in interface ServerConnector

Parameters:

children - The new child connectors (extensions and/or components)

isEnabled

public boolean isEnabled()

Description copied from interface: ServerConnector

Tests whether the connector is enabled or not. This method checks that the connector is enabled in context, i.e. if the parent connector is disabled, this method must return false.

Specified by:

isEnabled in interface ServerConnector

Returns:

true if the connector is enabled, false otherwise

updateEnabledState

public void updateEnabledState(boolean enabledState)

Specified by:

updateEnabledState in interface ServerConnector

getResourceUrl

public String getResourceUrl(String key)

Gets the URL for a resource that has been added by the server-side connector using com.vaadin.terminal.AbstractClientConnector#setResource(String, com.vaadin.terminal.Resource) with the same key. null is returned if no corresponding resource is found.

Parameters:

key - a string identifying the resource.

Returns:

the resource URL as a string, or null if no corresponding resource is found.

hasEventListener

public boolean hasEventListener(String eventIdentifier)

Description copied from interface: ServerConnector

Checks if an event listener has been registered on the server side for the given event identifier.

Specified by:

hasEventListener in interface ServerConnector

Parameters:

eventIdentifier - The identifier for the event

Returns:

true if a listener has been registered on the server side, false otherwise

forceStateChange

public void forceStateChange()

Force the connector to recheck its state variables as the variables or their meaning might have changed.

Since:

7.3