01: /*
02: * Copyright 2001-2004 The Apache Software Foundation.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
10: * Unless required by applicable law or agreed to in writing, software
11: * distributed under the License is distributed on an "AS IS" BASIS,
12: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13: * See the License for the specific language governing permissions and
14: * limitations under the License.
15: */
16: /*
17: * $Id: AbsoluteIterator.java,v 1.11 2004/02/16 22:54:59 minchau Exp $
18: */
19:
20: package org.apache.xalan.xsltc.dom;
21:
22: import org.apache.xalan.xsltc.runtime.BasisLibrary;
23: import org.apache.xml.dtm.DTMAxisIterator;
24: import org.apache.xml.dtm.ref.DTMAxisIteratorBase;
25: import org.apache.xml.dtm.ref.DTMDefaultBase;
26:
27: /**
28: * Absolute iterators ignore the node that is passed to setStartNode().
29: * Instead, they always start from the root node. The node passed to
30: * setStartNode() is not totally useless, though. It is needed to obtain the
31: * DOM mask, i.e. the index into the MultiDOM table that corresponds to the
32: * DOM "owning" the node.
33: *
34: * The DOM mask is cached, so successive calls to setStartNode() passing
35: * nodes from other DOMs will have no effect (i.e. this iterator cannot
36: * migrate between DOMs).
37: * @author Jacek Ambroziak
38: * @author Santiago Pericas-Geertsen
39: */
40: public final class AbsoluteIterator extends DTMAxisIteratorBase {
41:
42: /**
43: * Source for this iterator.
44: */
45: private DTMAxisIterator _source;
46:
47: public AbsoluteIterator(DTMAxisIterator source) {
48: _source = source;
49: // System.out.println("AI source = " + source + " this = " + this);
50: }
51:
52: public void setRestartable(boolean isRestartable) {
53: _isRestartable = isRestartable;
54: _source.setRestartable(isRestartable);
55: }
56:
57: public DTMAxisIterator setStartNode(int node) {
58: _startNode = DTMDefaultBase.ROOTNODE;
59: if (_isRestartable) {
60: _source.setStartNode(_startNode);
61: resetPosition();
62: }
63: return this ;
64: }
65:
66: public int next() {
67: return returnNode(_source.next());
68: }
69:
70: public DTMAxisIterator cloneIterator() {
71: try {
72: final AbsoluteIterator clone = (AbsoluteIterator) super
73: .clone();
74: clone._source = _source.cloneIterator(); // resets source
75: clone.resetPosition();
76: clone._isRestartable = false;
77: return clone;
78: } catch (CloneNotSupportedException e) {
79: BasisLibrary.runTimeError(BasisLibrary.ITERATOR_CLONE_ERR,
80: e.toString());
81: return null;
82: }
83: }
84:
85: public DTMAxisIterator reset() {
86: _source.reset();
87: return resetPosition();
88: }
89:
90: public void setMark() {
91: _source.setMark();
92: }
93:
94: public void gotoMark() {
95: _source.gotoMark();
96: }
97: }
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