1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.myfaces.flow.cdi;
20
21 import java.util.ArrayList;
22 import java.util.List;
23
24 import javax.enterprise.event.Observes;
25 import javax.enterprise.inject.spi.AnnotatedType;
26 import javax.enterprise.inject.spi.BeanManager;
27 import javax.enterprise.inject.spi.BeforeBeanDiscovery;
28 import javax.enterprise.inject.spi.Extension;
29 import javax.enterprise.inject.spi.ProcessProducer;
30 import javax.enterprise.inject.spi.Producer;
31 import javax.faces.flow.Flow;
32 import javax.faces.flow.builder.FlowDefinition;
33
34 /**
35 * This extension is responsible of scan flow definitions through CDI. For example:
36 *
37 * <code>
38 * @Produces @FlowDefinition
39 * public Flow defineFlow(@FlowBuilderParameter FlowBuilder flowBuilder) {...}
40 * </code>
41 *
42 * @author Leonardo Uribe
43 */
44 public class FlowBuilderCDIExtension implements Extension
45 {
46 private List<Producer<Flow>> flowProducers = new ArrayList<Producer<Flow>>();
47
48 public List<Producer<Flow>> getFlowProducers()
49 {
50 return flowProducers;
51 }
52
53 void beforeBeanDiscovery(
54 @Observes final BeforeBeanDiscovery event, BeanManager beanManager)
55 {
56 // Register FlowBuilderFactoryBean as a bean with CDI annotations, so the system
57 // can take it into account, and use it later when necessary.
58 AnnotatedType<FlowBuilderFactoryBean> flowDiscoveryHelper =
59 beanManager.createAnnotatedType(FlowBuilderFactoryBean.class);
60 event.addAnnotatedType(flowDiscoveryHelper);
61 }
62
63 /**
64 * Stores any producer method that is annotated with @FlowDefinition.
65 */
66 <T> void findFlowDefinition(@Observes ProcessProducer<T, Flow> processProducer)
67 {
68 if (processProducer.getAnnotatedMember().isAnnotationPresent(FlowDefinition.class))
69 {
70 flowProducers.add(processProducer.getProducer());
71 }
72 }
73 }