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Common Lisp implementation running on the JVM
/*
* Time.java
*
* Copyright (C) 2003-2005 Peter Graves
* $Id$
*
* This program 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
* of the License, or (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* 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 org.armedbear.lisp;
import static org.armedbear.lisp.Lisp.*;
import java.lang.reflect.Method;
import java.util.Date;
import java.util.TimeZone;
public final class Time
{
// ### %time
public static final Primitive _TIME = new pf__time();
private static final class pf__time extends Primitive {
pf__time() {
super("%time", PACKAGE_SYS, false);
}
@Override
public LispObject execute(LispObject arg) {
Cons.setCount(0);
long realStart = System.currentTimeMillis();
try {
return arg.execute();
} finally {
long realElapsed = System.currentTimeMillis() - realStart;
long count = Cons.getCount();
Stream out
= checkCharacterOutputStream(Symbol.TRACE_OUTPUT.symbolValue());
out.freshLine();
StringBuilder sb = new StringBuilder();
sb.append(String.valueOf((float)realElapsed / 1000));
sb.append(" seconds real time");
sb.append(System.getProperty("line.separator"));
sb.append(count);
sb.append(" cons cell");
if (count != 1)
sb.append('s');
sb.append(System.getProperty("line.separator"));
out._writeString(sb.toString());
out._finishOutput();
}
}
};
// ### get-internal-real-time
private static final Primitive GET_INTERNAL_REAL_TIME = new pf_get_internal_real_time();
private static final class pf_get_internal_real_time extends Primitive {
pf_get_internal_real_time() {
super("get-internal-real-time", "");
}
@Override
public LispObject execute() {
return number(System.currentTimeMillis());
}
};
// ### get-internal-run-time
private static final Primitive GET_INTERNAL_RUN_TIME = new pf_get_internal_run_time();
private static final class pf_get_internal_run_time extends Primitive {
pf_get_internal_run_time() {
super("get-internal-run-time", "");
}
@Override
public LispObject execute() {
return number(System.currentTimeMillis());
}
};
// ### get-universal-time
private static final Primitive GET_UNIVERSAL_TIME = new pf_get_universal_time();
private static final class pf_get_universal_time extends Primitive {
pf_get_universal_time() {
super("get-universal-time", "");
}
@Override
public LispObject execute() {
return number(System.currentTimeMillis() / 1000 + 2208988800L);
}
};
// ### default-time-zone => offset daylight-p
private static final Primitive DEFAULT_TIME_ZONE = new pf_default_time_zone();
private static final class pf_default_time_zone extends Primitive {
pf_default_time_zone() {
super("default-time-zone", PACKAGE_SYS, false);
}
@Override
public LispObject execute() {
return getTimeZone(System.currentTimeMillis());
}
};
private static final LispObject getTimeZone(long unixTimeMillis) {
TimeZone tz = TimeZone.getDefault();
//int offset = tz.getOffset(System.currentTimeMillis());
// Classpath hasn't implemented TimeZone.getOffset(long).
int rawOffset = tz.getRawOffset();
final boolean inDaylightTime =
tz.inDaylightTime(new Date(unixTimeMillis));
if (inDaylightTime)
rawOffset += tz.getDSTSavings();
// "Time zone values increase with motion to the west..."
// Convert milliseconds to hours.
return LispThread.currentThread()
.setValues(Fixnum.getInstance(- rawOffset).divideBy(Fixnum.getInstance(3600000)),
inDaylightTime ? T : NIL);
}
// ### get-time-zone universal-time => hours-west daylight-p
private static final Primitive GET_TIME_ZONE = new pf_get_time_zone();
@DocString(name="get-time-zone",
args="time-in-millis",
returns="hours-west daylight-p",
doc= "Returns as the first value the timezone difference in hours from the Greenwich meridian for TIME-IN-MILLIS via the Daylight Savings Time assumptions that were in place at the instant's occurance. Returns as the second value a boolean as to whether daylight savings time was in effect at the occurance.")
private static final class pf_get_time_zone extends Primitive {
pf_get_time_zone() {
super("get-time-zone", PACKAGE_EXT, true);
}
@Override
public LispObject execute(LispObject arg) {
return getTimeZone((arg.longValue() - 2208988800L) * 1000);
}
};
}