1 /*
2 * #%L
3 * prolobjectlink-jpi-jtrolog
4 * %%
5 * Copyright (C) 2012 - 2018 WorkLogic Project
6 * %%
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as
9 * published by the Free Software Foundation, either version 2.1 of the
10 * License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Lesser Public License for more details.
16 *
17 * You should have received a copy of the GNU General Lesser Public
18 * License along with this program. If not, see
19 * <http://www.gnu.org/licenses/lgpl-2.1.html>.
20 * #L%
21 */
22 package jTrolog.terms;
23
24 import jTrolog.terms.Term;
25 import jTrolog.engine.BindingsTable;
26
27 import java.util.Iterator;
28
29 /**
30 * @author ivar.orstavik@hist.no
31 */
32 @SuppressWarnings({ "rawtypes" })
33 public interface Wrapper {
34
35 int getContext();
36
37 Term getBasis();
38
39 static class WrappedIterator implements Iterator {
40
41 private Iterator underlyingIt;
42 private int ctx;
43
44 WrappedIterator(Iterator orig, int ctx) {
45 underlyingIt = orig;
46 this.ctx = ctx;
47 }
48
49 public boolean hasNext() {
50 return underlyingIt.hasNext();
51 }
52
53 public Object next() {
54 return BindingsTable.wrapWithID((Term) underlyingIt.next(), ctx);
55 }
56
57 public void remove() {
58 throw new UnsupportedOperationException("dont remove on Prolog lists");
59 }
60 }
61 }