/*
* Copyright 2011 JBoss, by Red Hat, Inc
*
* 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.ioc.client.api.ContextualTypeProvider;
import org.jboss.errai.ioc.client.api.IOCProvider;
import org.jboss.errai.ioc.client.container.IOC;
import org.jboss.errai.ioc.client.container.IOCBeanDef;
import javax.enterprise.inject.Instance;
import javax.inject.Singleton;
import java.lang.annotation.Annotation;
import java.util.Collections;
import java.util.Iterator;
@IOCProvider @Singleton
public class InstanceProvider implements ContextualTypeProvider<Instance> {
@Override
public Instance 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.
*/
return new InstanceImpl(typeargs[0], qualifiers);
}
static class InstanceImpl<U> implements Instance<Object> {
private final Class type;
private final Annotation[] qualifiers;
InstanceImpl(Class type, Annotation[] qualifiers) {
this.type = type;
this.qualifiers = qualifiers;
}
@Override
public Instance<Object> select(Annotation... qualifiers) {
return new InstanceImpl(type, qualifiers);
}
@Override
public <U extends Object> Instance<U> select(Class<U> subtype, Annotation... qualifiers) {
return new InstanceImpl(type, qualifiers);
}
@Override
public boolean isUnsatisfied() {
return false;
}
@Override
public boolean isAmbiguous() {
return false;
}
@Override
public Iterator<Object> iterator() {
return Collections.emptyList().iterator();
}
@Override
public Object get() {
IOCBeanDef bean = IOC.getBeanManager().lookupBean(type, qualifiers);
if (bean == null) {
return null;
}
else {
return bean.getInstance();
}
}
}
}