/*
* Copyright (C) 2011 Red Hat, Inc. and/or its affiliates.
*
* 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.jboss.errai.enterprise.client.cdi;
import org.jboss.errai.enterprise.client.cdi.api.CDI;
import org.jboss.errai.ioc.client.api.ContextualTypeProvider;
import org.jboss.errai.ioc.client.api.IOCProvider;
import javax.enterprise.event.Event;
import javax.inject.Singleton;
import java.lang.annotation.Annotation;
@IOCProvider
@Singleton
public class EventProvider implements ContextualTypeProvider<Event> {
@Override
public Event provide(final Class<?>[] typeargs, final Annotation[] qualifiers) {
/*
* If you see a compile error here, ensure that you are using Errai's custom
* version of javax.enterprise.event.Event, which comes from the
* errai-javax-enterprise project. The errai-cdi-client POM is set up this
* way.
*
* Eclipse users: seeing an error here probably indicates that M2E has
* clobbered your errai-javax-enterprise source folder settings. To fix your
* setup, see the README in the root of errai-javax-enterprise.
*/
final Class<?> eventType = (typeargs.length == 1 ? typeargs[0] : Object.class);
return new EventImpl(eventType, qualifiers);
}
private static class EventImpl implements Event<Object> {
private final Class<?> eventType;
private final Annotation[] _qualifiers;
private EventImpl(final Class<?> eventType,
final Annotation[] _qualifiers) {
this.eventType = eventType;
this._qualifiers = _qualifiers;
}
public void fire(final Object event) {
if (event == null)
return;
CDI.fireEvent(event, _qualifiers);
}
@Override
public Event<Object> select(final Annotation... qualifiers) {
if (qualifiers == null) return this;
return new EventImpl(eventType, concat(_qualifiers, qualifiers));
}
@Override
public <U extends Object> Event<U> select(final Class<U> subtype, final Annotation... qualifiers) {
return (Event<U>) new EventImpl(subtype, concat(_qualifiers, qualifiers));
}
private static Annotation[] concat(Annotation[] a, Annotation[] b) {
if (a == null) {
return b;
}
else if (b == null) {
return a;
}
final Annotation[] newQualifiers = new Annotation[a.length + b.length];
for (int i = 0; i < a.length; i++) {
newQualifiers[i] = a[i];
}
for (int i = 0; i < b.length; i++) {
newQualifiers[i + a.length] = b[i];
}
return newQualifiers;
}
public Class getEventType() {
return eventType;
}
public Annotation[] getQualifiers() {
return _qualifiers;
}
}
}