// PSP Dashboard - Data Automation Tool for PSP-like processes
// Copyright (C) 1999 United States Air Force
//
// 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.
//
// The author(s) may be contacted at:
// OO-ALC/TISHD
// Attn: PSP Dashboard Group
// 6137 Wardleigh Road
// Hill AFB, UT 84056-5843
//
// E-Mail POC: ken.raisor@hill.af.mil
package pspdash.data.compiler;
import pspdash.data.DataRepository;
import pspdash.data.DateData;
import pspdash.data.StringData;
import java.util.Iterator;
import java.util.List;
public class Maxdate extends AbstractFunction {
/** Perform a procedure call.
*
* This method <b>must</b> be thread-safe.
*/
public Object call(List arguments, ExpressionContext context)
{
if (getArg(arguments, 0) instanceof StringData)
return maxDateFor(arguments, context);
else
return maxDateOf(arguments, context);
}
private Object maxDateFor(List arguments, ExpressionContext context)
{
DateData result = null;
Object val;
String name = asString(getArg(arguments, 0));
if (name == null) return null;
Iterator i = collapseLists(arguments, 1).iterator();
String path, dataName;
while (i.hasNext()) {
path = asStringVal(i.next());
if (path == null) continue;
dataName = DataRepository.createDataName(path, name);
val = context.get(dataName);
if (val == null)
return null;
if (val instanceof DateData &&
(result == null || result.lessThan((DateData) val)))
result = (DateData) val;
}
return result;
}
private Object maxDateOf(List arguments, ExpressionContext context)
{
DateData result = null;
Object val;
Iterator i = collapseLists(arguments, 0).iterator();
while (i.hasNext()) {
val = i.next();
if (val == null)
return null;
if (val instanceof DateData &&
(result == null || result.lessThan((DateData) val)))
result = (DateData) val;
}
return result;
}
}