01: /*
02: * Copyright (C) 1999-2004 <A href="http://www-ist.massey.ac.nz/JBDietrich" target="_top">Jens Dietrich</a>
03: *
04: * This library is free software; you can redistribute it and/or
05: * modify it under the terms of the GNU Lesser General Public
06: * License as published by the Free Software Foundation; either
07: * version 2 of the License, or (at your option) any later version.
08: *
09: * This library is distributed in the hope that it will be useful,
10: * but WITHOUT ANY WARRANTY; without even the implied warranty of
11: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12: * Lesser General Public License for more details.
13: *
14: * You should have received a copy of the GNU Lesser General Public
15: * License along with this library; if not, write to the Free Software
16: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17: */
18: package org.mandarax.sql;
19:
20: import java.util.Collection;
21: import java.util.Iterator;
22:
23: import org.mandarax.kernel.Clause;
24:
25: /**
26: * A cached clause set iterator that simple takes a collection of (cached) facts
27: * and iterates it.
28: * @author <A href="http://www-ist.massey.ac.nz/JBDietrich" target="_top">Jens Dietrich</A>
29: * @version 3.4 <7 March 05>
30: * @since 1.5
31: */
32: class CachedClauseIterator extends
33: org.mandarax.util.AbstractClauseIterator {
34:
35: private Iterator iterateCache = null;
36:
37: /**
38: * Constructor.
39: * @param cache java.util.Collection
40: */
41: public CachedClauseIterator(Collection cache) {
42: super ();
43:
44: iterateCache = cache.iterator();
45: }
46:
47: /**
48: * Indicates whether there are more clauses.
49: * @return true if there are more clauses, false otherwise
50: */
51: public boolean hasMoreClauses() {
52: return iterateCache.hasNext();
53: }
54:
55: /**
56: * Get the next clause.
57: * @return the next clause
58: */
59: public Clause nextClause() {
60: return (Clause) iterateCache.next();
61: }
62: }
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