1 /*
2 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
3 * @LastModified: Oct 2017
4 */
5 /*
6 * Licensed to the Apache Software Foundation (ASF) under one or more
7 * contributor license agreements. See the NOTICE file distributed with
8 * this work for additional information regarding copyright ownership.
9 * The ASF licenses this file to You under the Apache License, Version 2.0
10 * (the "License"); you may not use this file except in compliance with
11 * the License. You may obtain a copy of the License at
12 *
13 * http://www.apache.org/licenses/LICENSE-2.0
14 *
15 * Unless required by applicable law or agreed to in writing, software
16 * distributed under the License is distributed on an "AS IS" BASIS,
17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18 * See the License for the specific language governing permissions and
19 * limitations under the License.
20 */
21
22 package com.sun.org.apache.xpath.internal.patterns;
23
24 import com.sun.org.apache.xml.internal.dtm.Axis;
25 import com.sun.org.apache.xml.internal.dtm.DTM;
26 import com.sun.org.apache.xml.internal.dtm.DTMAxisTraverser;
27 import com.sun.org.apache.xml.internal.dtm.DTMFilter;
28 import com.sun.org.apache.xpath.internal.XPathContext;
29 import com.sun.org.apache.xpath.internal.axes.WalkerFactory;
30 import com.sun.org.apache.xpath.internal.objects.XObject;
31 /**
32 * Special context node pattern matcher.
33 */
34 public class ContextMatchStepPattern extends StepPattern
35 {
36 static final long serialVersionUID = -1888092779313211942L;
37
38 /**
39 * Construct a ContextMatchStepPattern.
40 *
41 */
42 public ContextMatchStepPattern(int axis, int paxis)
43 {
44 super(DTMFilter.SHOW_ALL, axis, paxis);
45 }
46
47 /**
48 * Execute this pattern step, including predicates.
49 *
50 *
51 * @param xctxt XPath runtime context.
52 *
53 * @return {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_NODETEST},
54 * {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_NONE},
55 * {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_NSWILD},
56 * {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_QNAME}, or
57 * {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_OTHER}.
58 *
59 * @throws javax.xml.transform.TransformerException
60 */
61 public XObject execute(XPathContext xctxt)
62 throws javax.xml.transform.TransformerException
63 {
64
65 if (xctxt.getIteratorRoot() == xctxt.getCurrentNode())
66 return getStaticScore();
67 else
68 return NodeTest.SCORE_NONE;
69 }
70
71 /**
72 * Execute the match pattern step relative to another step.
73 *
74 *
75 * @param xctxt The XPath runtime context.
76 * NEEDSDOC @param prevStep
77 *
78 * @return {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_NODETEST},
79 * {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_NONE},
80 * {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_NSWILD},
81 * {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_QNAME}, or
82 * {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_OTHER}.
83 *
84 * @throws javax.xml.transform.TransformerException
85 */
86 public XObject executeRelativePathPattern(
87 XPathContext xctxt, StepPattern prevStep)
88 throws javax.xml.transform.TransformerException
89 {
90
91 XObject score = NodeTest.SCORE_NONE;
92 int context = xctxt.getCurrentNode();
93 DTM dtm = xctxt.getDTM(context);
94
95 if (null != dtm)
96 {
97 int predContext = xctxt.getCurrentNode();
98 DTMAxisTraverser traverser;
99
100 int axis = m_axis;
101
102 boolean needToTraverseAttrs = WalkerFactory.isDownwardAxisOfMany(axis);
103 boolean iterRootIsAttr = (dtm.getNodeType(xctxt.getIteratorRoot())
104 == DTM.ATTRIBUTE_NODE);
105
106 if((Axis.PRECEDING == axis) && iterRootIsAttr)
107 {
108 axis = Axis.PRECEDINGANDANCESTOR;
109 }
110
111 traverser = dtm.getAxisTraverser(axis);
112
113 for (int relative = traverser.first(context); DTM.NULL != relative;
114 relative = traverser.next(context, relative))
115 {
116 try
117 {
118 xctxt.pushCurrentNode(relative);
119
120 score = execute(xctxt);
121
122 if (score != NodeTest.SCORE_NONE)
123 {
124 //score = executePredicates( xctxt, prevStep, SCORE_OTHER,
125 // predContext, relative);
126 if (executePredicates(xctxt, dtm, context))
127 return score;
128
129 score = NodeTest.SCORE_NONE;
130 }
131
132 if(needToTraverseAttrs && iterRootIsAttr
133 && (DTM.ELEMENT_NODE == dtm.getNodeType(relative)))
134 {
135 int xaxis = Axis.ATTRIBUTE;
136 for (int i = 0; i < 2; i++)
137 {
138 DTMAxisTraverser atraverser = dtm.getAxisTraverser(xaxis);
139
140 for (int arelative = atraverser.first(relative);
141 DTM.NULL != arelative;
142 arelative = atraverser.next(relative, arelative))
143 {
144 try
145 {
146 xctxt.pushCurrentNode(arelative);
147
148 score = execute(xctxt);
149
150 if (score != NodeTest.SCORE_NONE)
151 {
152 //score = executePredicates( xctxt, prevStep, SCORE_OTHER,
153 // predContext, arelative);
154
155 if (score != NodeTest.SCORE_NONE)
156 return score;
157 }
158 }
159 finally
160 {
161 xctxt.popCurrentNode();
162 }
163 }
164 xaxis = Axis.NAMESPACE;
165 }
166 }
167
168 }
169 finally
170 {
171 xctxt.popCurrentNode();
172 }
173 }
174
175 }
176
177 return score;
178 }
179
180 }