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.spi.impl;
20
21 import java.util.List;
22 import java.util.logging.Level;
23 import java.util.logging.Logger;
24
25 import javax.faces.context.ExternalContext;
26
27 import org.apache.myfaces.shared.util.ClassUtils;
28 import org.apache.myfaces.spi.ServiceProviderFinderFactory;
29
30 /**
31 * Utils for SPI implementations.
32 *
33 * @since 2.0.3
34 * @author Leonardo Uribe
35 */
36 public final class SpiUtils
37 {
38
39 public static Object build(ExternalContext ectx, Class spiClass, String defaultImpl)
40 {
41 List<String> classList = ServiceProviderFinderFactory.getServiceProviderFinder(ectx).
42 getServiceProviderList(spiClass.getName());
43
44 if (classList != null && !classList.isEmpty())
45 {
46 if (classList.size() > 1)
47 {
48 getLogger().log(Level.WARNING, "More than one SPI interface for "+spiClass.getName()+
49 " found :" + classList.toString() + ". Setting up the first one found.");
50 }
51 return ClassUtils.newInstance(classList.get(0));
52 }
53 return ClassUtils.newInstance(defaultImpl);
54 }
55
56 private static Logger getLogger()
57 {
58 return Logger.getLogger(SpiUtils.class.getName());
59 }
60 }