01: package org.ofbiz.rules.engine;
02:
03: import java.util.*;
04:
05: /**
06: * <p><b>Title:</b> Program Enumerator
07: * <p><b>Description:</b> None
08: * <p>Copyright (c) 1999 Steven J. Metsker.
09: * <p>Copyright (c) 2001 The Open For Business Project - www.ofbiz.org
10: *
11: * <p>Permission is hereby granted, free of charge, to any person obtaining a
12: * copy of this software and associated documentation files (the "Software"),
13: * to deal in the Software without restriction, including without limitation
14: * the rights to use, copy, modify, merge, publish, distribute, sublicense,
15: * and/or sell copies of the Software, and to permit persons to whom the
16: * Software is furnished to do so, subject to the following conditions:
17: *
18: * <p>The above copyright notice and this permission notice shall be included
19: * in all copies or substantial portions of the Software.
20: *
21: * <p>THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
22: * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
24: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
25: * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT
26: * OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
27: * THE USE OR OTHER DEALINGS IN THE SOFTWARE.
28: *
29: * <br>
30: * <p>A ProgramEnumerator returns the axioms of a program, one at a time.
31: *
32: * @author Steven J. Metsker
33: * @version 1.0
34: */
35: public class ProgramEnumerator implements AxiomEnumeration {
36: protected Enumeration e;
37:
38: /**
39: * Construct an enumeration of the given program.
40: *
41: * @param Program the program to enumerate over
42: *
43: */
44: public ProgramEnumerator(Program p) {
45: e = Collections.enumeration(p.axioms);
46: }
47:
48: /**
49: * Tests if this enumeration contains more axioms.
50: *
51: * @return <code>true</code> if the program this enumeration
52: * is constructed for contains more axioms, and
53: * <code>false</code> otherwise.
54: */
55: public boolean hasMoreAxioms() {
56: return e.hasMoreElements();
57: }
58:
59: /**
60: * Returns the next axiom of this enumeration.
61: *
62: * @return the next axiom of this enumeration.
63: */
64: public Axiom nextAxiom() {
65: return (Axiom) e.nextElement();
66: }
67: }
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