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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  }