Skip to main content
aboutsummaryrefslogtreecommitdiffstats
blob: 4181a2fb296a9fdfcaf0b74323d2e79bb152b693 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
/*
 * Copyright (C) 2009, Google Inc.
 * Copyright (C) 2009, Robin Rosenberg <robin.rosenberg@dewire.com>
 * Copyright (C) 2009, Yann Simon <yann.simon.fr@gmail.com>
 * Copyright (C) 2012, Daniel Megert <daniel_megert@ch.ibm.com>
 * and other copyright owners as documented in the project's IP log.
 *
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Distribution License v1.0 which
 * accompanies this distribution, is reproduced below, and is
 * available at http://www.eclipse.org/org/documents/edl-v10.php
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials provided
 *   with the distribution.
 *
 * - Neither the name of the Eclipse Foundation, Inc. nor the
 *   names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior
 *   written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.eclipse.jgit.util;

import java.io.File;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Locale;
import java.util.TimeZone;

import org.eclipse.jgit.lib.Config;
import org.eclipse.jgit.storage.file.FileBasedConfig;

/**
 * Interface to read values from the system.
 * <p>
 * When writing unit tests, extending this interface with a custom class
 * permits to simulate an access to a system variable or property and
 * permits to control the user's global configuration.
 * </p>
 */
public abstract class SystemReader {
	private static SystemReader INSTANCE = new SystemReader() {
		private volatile String hostname;

		public String getenv(String variable) {
			return System.getenv(variable);
		}

		public String getProperty(String key) {
			return System.getProperty(key);
		}

		public FileBasedConfig openSystemConfig(Config parent, FS fs) {
			File prefix = fs.gitPrefix();
			if (prefix == null) {
				return new FileBasedConfig(null, fs) {
					public void load() {
						// empty, do not load
					}

					public boolean isOutdated() {
						// regular class would bomb here
						return false;
					}
				};
			}
			File etc = fs.resolve(prefix, "etc");
			File config = fs.resolve(etc, "gitconfig");
			return new FileBasedConfig(parent, config, fs);
		}

		public FileBasedConfig openUserConfig(Config parent, FS fs) {
			final File home = fs.userHome();
			return new FileBasedConfig(parent, new File(home, ".gitconfig"), fs);
		}

		public String getHostname() {
			if (hostname == null) {
				try {
					InetAddress localMachine = InetAddress.getLocalHost();
					hostname = localMachine.getCanonicalHostName();
				} catch (UnknownHostException e) {
					// we do nothing
					hostname = "localhost";
				}
				assert hostname != null;
			}
			return hostname;
		}

		@Override
		public long getCurrentTime() {
			return System.currentTimeMillis();
		}

		@Override
		public int getTimezone(long when) {
			return getTimeZone().getOffset(when) / (60 * 1000);
		}
	};

	/** @return the live instance to read system properties. */
	public static SystemReader getInstance() {
		return INSTANCE;
	}

	/**
	 * @param newReader
	 *            the new instance to use when accessing properties.
	 */
	public static void setInstance(SystemReader newReader) {
		INSTANCE = newReader;
	}

	/**
	 * Gets the hostname of the local host. If no hostname can be found, the
	 * hostname is set to the default value "localhost".
	 *
	 * @return the canonical hostname
	 */
	public abstract String getHostname();

	/**
	 * @param variable system variable to read
	 * @return value of the system variable
	 */
	public abstract String getenv(String variable);

	/**
	 * @param key of the system property to read
	 * @return value of the system property
	 */
	public abstract String getProperty(String key);

	/**
	 * @param parent
	 *            a config with values not found directly in the returned config
	 * @param fs
	 *            the file system abstraction which will be necessary to perform
	 *            certain file system operations.
	 * @return the git configuration found in the user home
	 */
	public abstract FileBasedConfig openUserConfig(Config parent, FS fs);

	/**
	 * @param parent
	 *            a config with values not found directly in the returned
	 *            config. Null is a reasonable value here.
	 * @param fs
	 *            the file system abstraction which will be necessary to perform
	 *            certain file system operations.
	 * @return the gitonfig configuration found in the system-wide "etc"
	 *         directory
	 */
	public abstract FileBasedConfig openSystemConfig(Config parent, FS fs);

	/**
	 * @return the current system time
	 */
	public abstract long getCurrentTime();

	/**
	 * @param when TODO
	 * @return the local time zone
	 */
	public abstract int getTimezone(long when);

	/**
	 * @return system time zone, possibly mocked for testing
	 * @since 1.2
	 */
	public TimeZone getTimeZone() {
		return TimeZone.getDefault();
	}

	/**
	 * @return the locale to use
	 * @since 1.2
	 */
	public Locale getLocale() {
		return Locale.getDefault();
	}

	/**
	 * Returns a simple date format instance as specified by the given pattern.
	 *
	 * @param pattern
	 *            the pattern as defined in
	 *            {@link SimpleDateFormat#SimpleDateFormat(String)}
	 * @return the simple date format
	 * @since 2.0
	 */
	public SimpleDateFormat getSimpleDateFormat(String pattern) {
		return new SimpleDateFormat(pattern);
	}

	/**
	 * Returns a date/time format instance for the given styles.
	 *
	 * @param dateStyle
	 *            the date style as specified in
	 *            {@link DateFormat#getDateTimeInstance(int, int)}
	 * @param timeStyle
	 *            the time style as specified in
	 *            {@link DateFormat#getDateTimeInstance(int, int)}
	 * @return the date format
	 * @since 2.0
	 */
	public DateFormat getDateTimeInstance(int dateStyle, int timeStyle) {
		return DateFormat.getDateTimeInstance(dateStyle, timeStyle);
	}

}

Back to the top