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.config.ds.DataSourceConfiguration;
21 import de.smartics.properties.api.core.domain.PropertiesContext;
22 import de.smartics.properties.spi.config.config.ConfigurationJndiLookupLoader;
23 import de.smartics.properties.spi.config.config.PropertiesConfiguration;
24
25 /**
26 * Responsible to read configuration properties to connect to a data source
27 * stored via JNDI.
28 */
29 public class DataSourceConfigurationLoader implements Serializable
30 {
31 // ********************************* Fields *********************************
32
33 // --- constants ------------------------------------------------------------
34
35 /**
36 * The class version identifier.
37 * <p>
38 * The value of this constant is {@value}.
39 * </p>
40 */
41 private static final long serialVersionUID = 1L;
42
43 /**
44 * The location within the classpath to find the configuration file to load.
45 */
46 public static final String CLASSPATH_LOCATION =
47 PropertiesContext.META_INF_HOME + "/datasource.properties";
48
49 // --- members --------------------------------------------------------------
50
51 // ****************************** Initializer *******************************
52
53 // ****************************** Constructors ******************************
54
55 /**
56 * Default constructor.
57 */
58 public DataSourceConfigurationLoader()
59 {
60 }
61
62 // ****************************** Inner Classes *****************************
63
64 // ********************************* Methods ********************************
65
66 // --- init -----------------------------------------------------------------
67
68 // --- get&set --------------------------------------------------------------
69
70 // --- business -------------------------------------------------------------
71
72 /**
73 * Loads the data source configuration.
74 *
75 * @return the data source configuration.
76 */
77 public DataSourceConfiguration load()
78 {
79 try
80 {
81 try
82 {
83 final DataSourceConfigurationPropertiesLoader propertiesLoader =
84 new DataSourceConfigurationPropertiesLoader();
85 final DataSourceConfiguration config = propertiesLoader.load();
86 return config;
87 }
88 catch (final IllegalStateException e)
89 {
90 return loadConfigFromJndi();
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 private DataSourceConfiguration loadConfigFromJndi()
102 {
103 try
104 {
105 final DataSourceConfigurationJndiLoader jndiLoader =
106 new DataSourceConfigurationJndiLoader();
107 final DataSourceConfiguration config = jndiLoader.load();
108 return config;
109 }
110 catch (final IllegalStateException e)
111 {
112 final ConfigurationJndiLookupLoader loader =
113 new ConfigurationJndiLookupLoader();
114 final PropertiesConfiguration allConfig = loader.load();
115 final DataSourceConfiguration config =
116 allConfig.getDataSourceConfiguration();
117 return config;
118 }
119 }
120
121 // --- object basics --------------------------------------------------------
122
123 }