1 /*
2 * Copyright 2012-2013 smartics, Kronseder & Reiner GmbH
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package de.smartics.properties.impl.config.ds;
17
18 import java.io.Serializable;
19
20 import de.smartics.properties.api.core.domain.PropertiesContext;
21
22 /**
23 * Responsible to read configuration properties to connect to a data source
24 * stored via JNDI.
25 */
26 public class DataSourceConfigurationLoader implements Serializable
27 {
28 // ********************************* Fields *********************************
29
30 // --- constants ------------------------------------------------------------
31
32 /**
33 * The class version identifier.
34 * <p>
35 * The value of this constant is {@value}.
36 * </p>
37 */
38 private static final long serialVersionUID = 1L;
39
40 /**
41 * The location within the classpath to find the configuration file to load.
42 */
43 public static final String CLASSPATH_LOCATION =
44 PropertiesContext.META_INF_HOME + "/datasource.properties";
45
46 // --- members --------------------------------------------------------------
47
48 // ****************************** Initializer *******************************
49
50 // ****************************** Constructors ******************************
51
52 /**
53 * Default constructor.
54 */
55 public DataSourceConfigurationLoader()
56 {
57 }
58
59 // ****************************** Inner Classes *****************************
60
61 // ********************************* Methods ********************************
62
63 // --- init -----------------------------------------------------------------
64
65 // --- get&set --------------------------------------------------------------
66
67 // --- business -------------------------------------------------------------
68
69 /**
70 * Loads the data source configuration.
71 *
72 * @return the data source configuration.
73 */
74 public DataSourceConfiguration load()
75 {
76 try
77 {
78 try
79 {
80 final DataSourceConfigurationPropertiesLoader propertiesLoader =
81 new DataSourceConfigurationPropertiesLoader();
82 final DataSourceConfiguration config = propertiesLoader.load();
83 return config;
84 }
85 catch (final IllegalStateException e)
86 {
87 final DataSourceConfigurationJndiLoader jndiLoader =
88 new DataSourceConfigurationJndiLoader();
89 final DataSourceConfiguration config = jndiLoader.load();
90 return config;
91 }
92 }
93 catch (final IllegalStateException e)
94 {
95 throw new IllegalStateException(
96 String.format("Cannot configure the access to a data source: %s",
97 e.getMessage(), e));
98 }
99 }
100
101 // --- object basics --------------------------------------------------------
102
103 }