package act.util;
/*-
* #%L
* ACT Framework
* %%
* Copyright (C) 2014 - 2017 ActFramework
* %%
* 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.
* #L%
*/
import act.app.App;
import act.app.event.AppEventId;
import act.event.AppEventListenerBase;
import act.plugin.AppServicePlugin;
import org.osgl.$;
import org.osgl.logging.L;
import org.osgl.logging.Logger;
import org.osgl.util.E;
import java.util.EventObject;
/**
* Find classes that extends a specified type directly
* or indirectly, or implement a specified type directly
* or indirectly
*/
public abstract class SubTypeFinder<T> extends AppServicePlugin {
protected static Logger logger = L.get(SubTypeFinder.class);
private Class<T> targetType;
private AppEventId bindingEvent = AppEventId.DEPENDENCY_INJECTOR_PROVISIONED;
public SubTypeFinder(Class<T> target) {
E.NPE(target);
targetType = target;
}
public SubTypeFinder(Class<T> target, AppEventId bindingEvent) {
this(target);
this.bindingEvent = $.notNull(bindingEvent);
}
protected abstract void found(Class<? extends T> target, App app);
@Override
public final void applyTo(final App app) {
app.eventBus().bind(bindingEvent, new AppEventListenerBase() {
@Override
public void on(EventObject event) throws Exception {
ClassInfoRepository repo = app.classLoader().classInfoRepository();
ClassNode parent = repo.node(targetType.getName());
parent.visitPublicNotAbstractTreeNodes(new $.Visitor<ClassNode>() {
@Override
public void visit(ClassNode classNode) throws $.Break {
final Class<T> c = $.classForName(classNode.name(), app.classLoader());
found(c, app);
}
});
}
});
}
}