/*
* 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.ui;
import java.util.Collections;
import java.util.List;
import com.google.gwt.event.shared.HandlerRegistration;
import com.vaadin.client.ComponentConnector;
import com.vaadin.client.ConnectorHierarchyChangeEvent;
import com.vaadin.client.ConnectorHierarchyChangeEvent.ConnectorHierarchyChangeHandler;
import com.vaadin.client.HasComponentsConnector;
public abstract class AbstractHasComponentsConnector
extends AbstractComponentConnector
implements HasComponentsConnector, ConnectorHierarchyChangeHandler {
List<ComponentConnector> childComponents;
/**
* Default constructor
*/
public AbstractHasComponentsConnector() {
addConnectorHierarchyChangeHandler(this);
}
/*
* (non-Javadoc)
*
* @see com.vaadin.client.HasComponentsConnector#getChildren()
*/
@Override
public List<ComponentConnector> getChildComponents() {
if (childComponents == null) {
return Collections.emptyList();
}
return childComponents;
}
/*
* (non-Javadoc)
*
* @see com.vaadin.client.HasComponentsConnector#setChildren
* (java.util.Collection)
*/
@Override
public void setChildComponents(List<ComponentConnector> childComponents) {
this.childComponents = childComponents;
}
@Override
public HandlerRegistration addConnectorHierarchyChangeHandler(
ConnectorHierarchyChangeHandler handler) {
return ensureHandlerManager()
.addHandler(ConnectorHierarchyChangeEvent.TYPE, handler);
}
}