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.spi.config.domain.key;
17
18 /**
19 * Provides access to the manager and configuration key implementations.
20 */
21 public final class ConfigurationKeyContextManager
22 {
23 // ********************************* Fields *********************************
24
25 // --- constants ------------------------------------------------------------
26
27 /**
28 * The singleton to provide access to the manager and configuration key
29 * implementations.
30 */
31 public static final ConfigurationKeyContextManager INSTANCE =
32 new ConfigurationKeyContextManager();
33
34 // --- members --------------------------------------------------------------
35
36 /**
37 * The configured context instance to access configuration key helpers.
38 */
39 private final ConfigurationKeyContext context; // NOPMD
40
41 // ****************************** Initializer *******************************
42
43 // ****************************** Constructors ******************************
44
45 /**
46 * Default constructor.
47 */
48 private ConfigurationKeyContextManager()
49 {
50 this.context = createContext();
51 }
52
53 // ****************************** Inner Classes *****************************
54
55 // ********************************* Methods ********************************
56
57 // --- init -----------------------------------------------------------------
58
59 @SuppressWarnings("unchecked")
60 private ConfigurationKeyContext createContext()
61 {
62 final String defaultTypeName =
63 "de.smartics.properties.impl.config.domain.key.envapp.EnvAppConfigurationKeyContext";
64 try
65 {
66 final Class<ConfigurationKeyContext> defaultType =
67 (Class<ConfigurationKeyContext>) Class.forName(defaultTypeName);
68 final ConfigurationKeyContextFactory factory =
69 new ConfigurationKeyContextFactory();
70
71 final ConfigurationKeyContext instance = factory.create(defaultType);
72 return instance;
73 }
74 catch (final Exception e)
75 {
76 throw new IllegalStateException(
77 String
78 .format(
79 "Cannot find configuration key context and cannot create default: %s",
80 defaultTypeName));
81 }
82 }
83
84 // --- get&set --------------------------------------------------------------
85
86 /**
87 * Returns the configured context instance to access configuration key
88 * helpers.
89 *
90 * @return the configured context instance to access configuration key
91 * helpers.
92 */
93 public ConfigurationKeyContext context()
94 {
95 return context;
96 }
97
98 // --- business -------------------------------------------------------------
99
100 // --- object basics --------------------------------------------------------
101
102 }