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/*
* Copyright 2000-2016 Vaadin Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.vaadin.client;
import java.util.Collection;
import java.util.List;
import com.google.gwt.event.shared.GwtEvent;
import com.google.gwt.event.shared.HandlerRegistration;
import com.vaadin.client.communication.StateChangeEvent.StateChangeHandler;
import com.vaadin.shared.Connector;
import com.vaadin.shared.communication.ClientRpc;
import com.vaadin.shared.communication.SharedState;
/**
* Interface implemented by all client side classes that can be communicate with
* the server. Classes implementing this interface are initialized by the
* framework when needed and have the ability to communicate with the server.
*
* @author Vaadin Ltd
* @since 7.0.0
*/
public interface ServerConnector extends Connector {
/**
* Gets ApplicationConnection instance that created this connector.
*
* @return The ApplicationConnection as set by
* {@link #doInit(String, ApplicationConnection)}
*/
public ApplicationConnection getConnection();
/**
* 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.
*
* @return true if the connector is enabled, false otherwise
*/
public boolean isEnabled();
/**
*
* Called once by the framework to initialize the connector.
*
* Note that the shared state is not yet available at this point nor any
* hierarchy information.
*/
public void doInit(String connectorId, ApplicationConnection connection);
/**
* For internal use by the framework: returns the registered RPC
* implementations for an RPC interface identifier.
*
* TODO interface identifier type or format may change
*
* @param rpcInterfaceId
* RPC interface identifier: fully qualified interface type name
* @return RPC interface implementations registered for an RPC interface,
* not null
*/
public Collection getRpcImplementations(
String rpcInterfaceId);
/**
* Adds a handler that is called whenever any part of the state has been
* updated by the server.
*
* @param handler
* The handler that should be added.
* @return A handler registration reference that can be used to unregister
* the handler
*/
public HandlerRegistration addStateChangeHandler(
StateChangeHandler handler);
/**
* Removes a handler that is called whenever any part of the state has been
* updated by the server.
*
* @param handler
* The handler that should be removed.
*/
public void removeStateChangeHandler(StateChangeHandler handler);
/**
* Adds a handler that is called whenever the given part of the state has
* been updated by the server.
*
* @param propertyName
* the name of the property for which the handler should be
* called
* @param handler
* The handler that should be added.
* @return A handler registration reference that can be used to unregister
* the handler
*/
public HandlerRegistration addStateChangeHandler(String propertyName,
StateChangeHandler handler);
/**
* Removes a handler that is called whenever any part of the state has been
* updated by the server.
*
* @param propertyName
* the name of the property for which the handler should be
* called
* @param handler
* The handler that should be removed.
*/
public void removeStateChangeHandler(String propertyName,
StateChangeHandler handler);
/**
* Sends the given event to all registered handlers.
*
* @param event
* The event to send.
*/
public void fireEvent(GwtEvent event);
/**
* Event called when connector has been unregistered.
*/
public void onUnregister();
/**
* Returns the parent of this connector. Can be null for only the root
* connector.
*
* @return The parent of this connector, as set by
* {@link #setParent(ServerConnector)}.
*/
@Override
public ServerConnector getParent();
/**
* 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
* {@link ConnectorHierarchyChangeEvent}. The event is fired only when the
* whole hierarchy has been updated.
*
* @param parent
* The new parent of the connector
*/
public void setParent(ServerConnector parent);
public void updateEnabledState(boolean enabledState);
/**
* 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
* {@link 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.
*
* @param children
* The new child connectors (extensions and/or components)
*/
public void setChildren(List children);
/**
* Returns the child connectors for this connector (child components and
* extensions).
*
* Note that the method {@link HasComponentsConnector#getChildComponents()}
* can be used to obtain the subset of child connectors that correspond to
* components and not extensions.
*
* @return A collection of child connectors (components or extensions) for
* this connector. An empty collection if there are no children.
* Never returns null.
*/
public List getChildren();
/**
* Gets the current shared state of the connector.
*
* Note that state is considered an internal part of the connector. You
* should not rely on the state object outside of the connector who owns it.
* If you depend on the state of other connectors you should use their
* public API instead of their state object directly.
*
* @since 7.0.
* @return state The shared state object. Can be any sub type of
* {@link SharedState}. Never null.
*/
public SharedState getState();
/**
* Checks if an event listener has been registered on the server side for
* the given event identifier.
*
* @param eventIdentifier
* The identifier for the event
* @return true if a listener has been registered on the server side, false
* otherwise
*/
public boolean hasEventListener(String eventIdentifier);
}