Add the datetime class, a shim between our time_t stuff and QDateTime.

git-svn-id: http://gpsbabel.googlecode.com/svn/trunk@4267 f51c46e8-681c-474f-0cfe-069cfd0219fb

diff --git a/gpsbabel/src/core/datetime.h b/gpsbabel/src/core/datetime.h
new file mode 100644 (file)
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+++ b/gpsbabel/src/core/datetime.h
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+/*
+    Shim to provide overloads between QDateTime and the zillions of places
+    that know about time_t.
+
+    Copyright (C) 2012, 2013 Robert Lipe, robertlipe@gpsbabel.org
+
+    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 USA
+
+ */
+
+
+#include <time.h>
+
+#include <QtCore/qdatetime.h>
+
+// As this code began in C, we have several hundred places that set and
+// read creation_time as a time_t.  Provide some operator overloads to make
+// that less painful.
+// Probably all of these should eventually go away and be replaced by 
+// "Better" code in the callers.
+
+// Consider putting in a namespace instead of prefixing 'gb'.
+namespace gpsbabel {
+
+class DateTime : public QDateTime {
+public:
+  // As a crutch, mimic the old behaviour of an uninitialized creation time
+  // being 1/1/1970.
+  DateTime() {
+    this->setTime_t(0);
+    t_ = -1;
+  }
+
+  // Handle time_tm tm = wpt->creation_time;
+  operator const time_t() const  {
+    return this->toTime_t();
+  }
+
+  const time_t& operator=(const time_t& t) {
+    this->setTime_t(t);
+    return t;
+  }
+
+  const time_t operator-- (int)  {
+    setTime_t(toTime_t() - 1);
+    return this->toTime_t();
+  }
+
+  const time_t operator++ (int)  {
+    setTime_t(toTime_t() + 1);
+    return this->toTime_t();
+  }
+
+  const time_t operator+=(const time_t&t) {
+   setTime_t(toTime_t() + t);
+    return this->toTime_t();
+  }
+
+  // Handle       tm = *gmtime(&wpt->creation_time)  ...poorly.
+  inline const time_t* operator&() {
+    t_ = this->toTime_t();
+//fprintf(stderr, "inline set time_t %d\n", t_);
+    return &t_;
+  }
+
+  // Integer form: YYMMDD
+  int ymd() const {
+    QDate date(this->date());
+    return date.year() * 10000 + date.month() * 100 + date.day();
+  }
+
+  int ddmmyy() const {
+    QDate date(this->date());
+    return date.day() * 10000 + date.month() * 100 + date.year();
+  }
+
+  int hms() const {
+    QTime time(this->time());
+    return time.hour() * 10000 + time.minute() * 100 + time.second();
+  }
+ private:
+  time_t t_;
+};
+
+} // namespace gpsbabel