2 * Copyright (C) 2001, 2002 The Mir-coders group
4 * This file is part of Mir.
6 * Mir is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * Mir is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with Mir; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 * In addition, as a special exception, The Mir-coders gives permission to link
21 * the code of this program with the com.oreilly.servlet library, any library
22 * licensed under the Apache Software License, The Sun (tm) Java Advanced
23 * Imaging library (JAI), The Sun JIMI library (or with modified versions of
24 * the above that use the same license as the above), and distribute linked
25 * combinations including the two. You must obey the GNU General Public
26 * License in all respects for all of the code used other than the above
27 * mentioned libraries. If you modify this file, you may extend this exception
28 * to your version of the file, but you are not obligated to do so. If you do
29 * not wish to do so, delete this exception statement from your version.
38 import mir.generator.*;
40 public class GeneratorListFunctions {
41 private GeneratorListFunctions() {}
43 public static class subListFunction implements Generator.GeneratorFunction {
44 public Object perform(List aParameters) throws GeneratorExc, GeneratorFailure {
49 if (aParameters.size()>3 || aParameters.size()<2)
50 throw new GeneratorExc("iteratorSubsetFunction: 2 or 3 parameters expected");
51 if (aParameters.get(0)==null)
54 if (!(aParameters.get(0) instanceof RewindableIterator) && !(aParameters.get(0) instanceof List))
55 throw new GeneratorExc("iteratorSubsetFunction: first parameter must be a RewindableIterator (not a "+aParameters.get(0).getClass().getName()+")");
57 skip = StringRoutines.interpretAsInteger(aParameters.get(1));
58 if (aParameters.size()>=2)
59 maxSize = StringRoutines.interpretAsInteger(aParameters.get(2));
64 if ((aParameters.get(0) instanceof RewindableIterator))
65 return new SubsetIterator((RewindableIterator) aParameters.get(0), skip, maxSize);
67 List list = (List) aParameters.get(0);
69 if (skip>=list.size())
71 if (maxSize<0 || (skip+maxSize)>=list.size())
72 return list.subList(skip, list.size());
74 return list.subList(skip, skip+maxSize);
77 catch (GeneratorExc e) {
80 catch (GeneratorFailure e) {
84 throw new GeneratorFailure(e);