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Diffstat (limited to 'libjava/gnu/classpath/SystemProperties.java')
| -rw-r--r-- | libjava/gnu/classpath/SystemProperties.java | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/libjava/gnu/classpath/SystemProperties.java b/libjava/gnu/classpath/SystemProperties.java new file mode 100644 index 0000000..ee64280 --- /dev/null +++ b/libjava/gnu/classpath/SystemProperties.java @@ -0,0 +1,154 @@ +/* SystemProperties.java -- Manage the System properties. + Copyright (C) 2004, 2005 Free Software Foundation + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA +02111-1307 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package gnu.classpath; + +import java.util.Properties; + +/** + * The class manages the System properties. This class is only available to + * privileged code (i.e. code loaded by the bootstrap class loader) and + * therefore doesn't do any security checks. + * This class is separated out from java.lang.System to simplify bootstrap + * dependencies and to allow trusted code a simple and efficient mechanism + * to access the system properties. + */ +public class SystemProperties +{ + /** + * Stores the current system properties. This can be modified by + * {@link #setProperties(Properties)}, but will never be null, because + * setProperties(null) sucks in the default properties. + */ + private static Properties properties; + + /** + * The default properties. Once the default is stabilized, + * it should not be modified; + * instead it is cloned when calling <code>setProperties(null)</code>. + */ + private static final Properties defaultProperties = new Properties(); + + private static native void insertSystemProperties(Properties properties); + + static + { + insertSystemProperties(defaultProperties); + + // Set base URL if not already set. + if (defaultProperties.get("gnu.classpath.home.url") == null) + defaultProperties.put("gnu.classpath.home.url", + "file://" + + defaultProperties.get("gnu.classpath.home") + + "/lib"); + + // Set short name if not already set. + if (defaultProperties.get("gnu.classpath.vm.shortname") == null) + { + String value = defaultProperties.getProperty("java.vm.name"); + int index = value.lastIndexOf(' '); + if (index != -1) + value = value.substring(index + 1); + defaultProperties.put("gnu.classpath.vm.shortname", value); + } + + // Network properties + if (defaultProperties.get("http.agent") == null) + { + String userAgent = ("gnu-classpath/" + + defaultProperties.getProperty("gnu.classpath.version") + + " (" + + defaultProperties.getProperty("gnu.classpath.vm.shortname") + + "/" + + defaultProperties.getProperty("java.vm.version") + + ")"); + defaultProperties.put("http.agent", userAgent); + } + + defaultProperties.put("gnu.cpu.endian", + isWordsBigEndian() ? "big" : "little"); + + // XXX FIXME - Temp hack for old systems that set the wrong property + if (defaultProperties.get("java.io.tmpdir") == null) + defaultProperties.put("java.io.tmpdir", + defaultProperties.get("java.tmpdir")); + + // Note that we use clone here and not new. Some programs assume + // that the system properties do not have a parent. + properties = (Properties) defaultProperties.clone(); + } + + public static String getProperty(String name) + { + return properties.getProperty(name); + } + + public static String getProperty(String name, String defaultValue) + { + return properties.getProperty(name, defaultValue); + } + + public static String setProperty(String name, String value) + { + return (String) properties.setProperty(name, value); + } + + public static Properties getProperties() + { + return properties; + } + + public static void setProperties(Properties properties) + { + if (properties == null) + { + // Note that we use clone here and not new. Some programs + // assume that the system properties do not have a parent. + properties = (Properties)defaultProperties.clone(); + } + + SystemProperties.properties = properties; + } + + /** + * Detect big-endian systems. + * + * @return true if the system is big-endian. + */ + private static native boolean isWordsBigEndian(); +} |