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/*
* Copyright 2000-2018 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.ui;
import java.io.Serializable;
/**
* Internal utility class.
*
* @since 8.1
* @author Vaadin Ltd
*/
public class ComponentRootSetter implements Serializable {
private ComponentRootSetter() {
// Util methods only
}
/**
* Sets the composition root for the given custom component or composite.
* <p>
* For internal use only.
*
* @param customComponent
* the custom component or composite
* @param component
* the component to assign as composition root
*/
public static void setRoot(Component customComponent, Component component) {
if (customComponent instanceof CustomComponent) {
((CustomComponent) customComponent).setCompositionRoot(component);
} else if (customComponent instanceof Composite) {
((Composite) customComponent).setCompositionRoot(component);
} else {
throw new IllegalArgumentException(
"Parameter is of an unsupported type: "
+ customComponent.getClass().getName());
}
}
/**
* Checks if the given custom component or composite may accept a root component.
* <p>
* For internal use only.
*
* @param customComponent
* the custom component or composite
* @return
* @since 8.4
*
*/
public static boolean canSetRoot(Component customComponent) {
if(customComponent instanceof CustomComponent) {
return true;
}
if(customComponent instanceof Composite) {
return ((Composite)customComponent).getCompositionRoot() == null;
}
return false;
}
}
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