01: /*
02: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
03: *
04: * This file is part of Resin(R) Open Source
05: *
06: * Each copy or derived work must preserve the copyright notice and this
07: * notice unmodified.
08: *
09: * Resin Open Source is free software; you can redistribute it and/or modify
10: * it under the terms of the GNU General Public License as published by
11: * the Free Software Foundation; either version 2 of the License, or
12: * (at your option) any later version.
13: *
14: * Resin Open Source is distributed in the hope that it will be useful,
15: * but WITHOUT ANY WARRANTY; without even the implied warranty of
16: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17: * of NON-INFRINGEMENT. See the GNU General Public License for more
18: * details.
19: *
20: * You should have received a copy of the GNU General Public License
21: * along with Resin Open Source; if not, write to the
22: * Free SoftwareFoundation, Inc.
23: * 59 Temple Place, Suite 330
24: * Boston, MA 02111-1307 USA
25: *
26: * @author Scott Ferguson
27: */
28:
29: package com.caucho.xpath.pattern;
30:
31: import com.caucho.xpath.ExprEnvironment;
32:
33: import org.w3c.dom.Node;
34: import org.w3c.dom.NodeList;
35:
36: /**
37: * Iterates through matching nodes.
38: */
39: public class SingleNodeIterator extends NodeIterator implements
40: NodeList {
41: protected Node _node;
42:
43: public SingleNodeIterator(ExprEnvironment env, Node node) {
44: super (env);
45:
46: _node = node;
47: }
48:
49: /**
50: * Returns the current position.
51: */
52: public int getPosition() {
53: return _node == null ? 1 : 0;
54: }
55:
56: /**
57: * True if there's more data.
58: */
59: public boolean hasNext() {
60: return _node != null;
61: }
62:
63: /**
64: * Returns the next node.
65: */
66: public Node nextNode() {
67: if (_node != null) {
68: Node next = _node;
69: _node = null;
70: return next;
71: } else
72: return null;
73: }
74:
75: /**
76: * Returns the NodeList length.
77: */
78: public int getLength() {
79: return _node != null ? 1 : 0;
80: }
81:
82: /**
83: * Returns the NodeList item.
84: */
85: public Node item(int i) {
86: return i == 0 ? _node : null;
87: }
88:
89: /**
90: * clones the iterator
91: */
92: public Object clone() {
93: return new SingleNodeIterator(_env, _node);
94: }
95: }
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