/**
* Copyright 2010 Molindo GmbH
*
* 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 org.wicketstuff.mergedresources.annotations;
import java.util.HashMap;
import org.apache.wicket.Component;
import org.apache.wicket.MarkupContainer;
import org.apache.wicket.application.IComponentInstantiationListener;
public class ContributionInjector implements IComponentInstantiationListener {
private HashMap<Class<? extends Component>, HeaderContribution> _contributions = new HashMap<Class<? extends Component>, HeaderContribution>();
public void onInstantiation(Component component) {
if (eligible(component)) {
asMarkupContainer(component).add(getHeaderContribution(component.getClass()));
}
}
private HeaderContribution getHeaderContribution(Class<? extends Component> cls) {
HeaderContribution hc = _contributions.get(cls);
if (hc == null) {
synchronized (_contributions) {
hc = new HeaderContribution(cls);
_contributions.put(cls, hc);
}
}
return hc;
}
private MarkupContainer asMarkupContainer(Component component) {
return (MarkupContainer) component;
}
private boolean hasResourceAnnotation(Component component) {
return component.getClass().getAnnotation(JsContribution.class) != null
|| component.getClass().getAnnotation(CssContribution.class) != null;
}
private boolean eligible(Component component) {
return MarkupContainer.class.isAssignableFrom(component.getClass()) && hasResourceAnnotation(component);
}
}