Method: static {...}

1: /*
2: * *************************************************************************************************************************************************************
3: *
4: * TheseFoolishThings: Miscellaneous utilities
5: * http://tidalwave.it/projects/thesefoolishthings
6: *
7: * Copyright (C) 2009 - 2024 by Tidalwave s.a.s. (http://tidalwave.it)
8: *
9: * *************************************************************************************************************************************************************
10: *
11: * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
12: * You may obtain a copy of the License at
13: *
14: * http://www.apache.org/licenses/LICENSE-2.0
15: *
16: * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
17: * CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
18: *
19: * *************************************************************************************************************************************************************
20: *
21: * git clone https://bitbucket.org/tidalwave/thesefoolishthings-src
22: * git clone https://github.com/tidalwave-it/thesefoolishthings-src
23: *
24: * *************************************************************************************************************************************************************
25: */
26: package it.tidalwave.util;
27:
28: import javax.annotation.Nonnull;
29: import java.util.Optional;
30: import java.nio.file.Path;
31: import static it.tidalwave.role.impl.ServiceLoaderLocator.lazySupplierOf;
32:
33: /***************************************************************************************************************************************************************
34: *
35: * @author Fabrizio Giudici
36: * @since 3.2-ALPHA-17
37: *
38: **************************************************************************************************************************************************************/
39: public interface PreferencesHandler
40: {
41: static class Inner
42: {
43: private static final LazySupplier<PreferencesHandler> REF = lazySupplierOf(PreferencesHandler.class);
44: }
45:
46: public static final String PROPS_BASE_NAME = PreferencesHandler.class.getPackage().getName();
47:
48: public static final String PROP_APP_NAME = PROPS_BASE_NAME + ".appName";
49:
50: /** Suppress any console output. @since 3.2-ALPHA-21 */
51: public static final String PROP_SUPPRESS_CONSOLE = PROPS_BASE_NAME + ".suppressConsoleOutput";
52:
53: /***********************************************************************************************************************************************************
54: * Returns a singleton instance.
55: *
56: * @return the singleton instance
57: **********************************************************************************************************************************************************/
58: @Nonnull
59: public static PreferencesHandler getInstance()
60: {
61: return Inner.REF.get();
62: }
63:
64: /***********************************************************************************************************************************************************
65: * Returns the path of the folder where files related to the app should go.
66: *
67: * @return the path
68: **********************************************************************************************************************************************************/
69: @Nonnull
70: public Path getAppFolder();
71:
72: /***********************************************************************************************************************************************************
73: * Returns the path of the folder where logs should go.
74: *
75: * @return the path
76: **********************************************************************************************************************************************************/
77: @Nonnull
78: public Path getLogFolder();
79:
80: /***********************************************************************************************************************************************************
81: * Sets the application name. This method must be called at boot from the {@code main} method before doing
82: * anything else.
83: *
84: * @param name the property name
85: **********************************************************************************************************************************************************/
86: public static void setAppName (@Nonnull final String name)
87: {
88: System.setProperty(PROP_APP_NAME, name);
89: }
90:
91: /***********************************************************************************************************************************************************
92: * Gets a property.
93: *
94: * @param <T> the property type
95: * @param name the property name
96: * @return the property value
97: **********************************************************************************************************************************************************/
98: @Nonnull
99: public <T> Optional<T> getProperty (@Nonnull Key<T> name);
100:
101: /***********************************************************************************************************************************************************
102: * Sets a property, overriding the current value.
103: *
104: * @param <T> the property type
105: * @param name the property name
106: * @param value the property value
107: **********************************************************************************************************************************************************/
108: public <T> void setProperty (@Nonnull final Key<T> name, @Nonnull final T value);
109:
110: /**
111: *
112: * Sets a property, unless it has been already set.
113: *
114: * @param <T> the property type
115: * @param name the property name
116: * @param value the property value
117: **********************************************************************************************************************************************************/
118: public <T> void setDefaultProperty (@Nonnull final Key<T> name, @Nonnull final T value);
119: }