/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.isis.viewer.wicket.ui.components.collection.selector;
import org.apache.wicket.Component;
public interface CollectionSelectorProvider {
CollectionSelectorPanel getSelectorDropdownPanel();
public static class Util {
/**
* Searches up the component hierarchy looking for a parent that implements
* {@link org.apache.isis.viewer.wicket.ui.components.collection.selector.CollectionSelectorProvider}.
*
* @return the panel, or null (if there are no alternative views)
*/
public static CollectionSelectorPanel getCollectionSelectorProvider(Component component) {
while(component != null) {
if(component instanceof CollectionSelectorProvider) {
final CollectionSelectorPanel selectorDropdownPanelIfAny = ((CollectionSelectorProvider) component).getSelectorDropdownPanel();
return selectorDropdownPanelIfAny;
}
component = component.getParent();
}
throw new IllegalStateException("Could not locate parent that implements CollectionSelectorProvider");
}
}
}