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/*
* Copyright (C) 2009, Google Inc.
* Copyright (C) 2009, Robin Rosenberg <robin.rosenberg@dewire.com>
* Copyright (C) 2009, Yann Simon <yann.simon.fr@gmail.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.util.TimeZone;
import org.eclipse.jgit.lib.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 openUserConfig(FS fs) {
final File home = fs.userHome();
return new FileBasedConfig(new File(home, ".gitconfig"));
}
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 TimeZone.getDefault().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 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(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);
}
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