1 /*
2 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
3 */
4 /*
5 * Licensed to the Apache Software Foundation (ASF) under one or more
6 * contributor license agreements. See the NOTICE file distributed with
7 * this work for additional information regarding copyright ownership.
8 * The ASF licenses this file to You under the Apache License, Version 2.0
9 * (the "License"); you may not use this file except in compliance with
10 * the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing, software
15 * distributed under the License is distributed on an "AS IS" BASIS,
16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 * See the License for the specific language governing permissions and
18 * limitations under the License.
19 */
20
21 package com.sun.org.apache.xpath.internal.patterns;
22
23 import com.sun.org.apache.xml.internal.dtm.Axis;
24 import com.sun.org.apache.xml.internal.dtm.DTM;
25 import com.sun.org.apache.xml.internal.dtm.DTMAxisTraverser;
26 import com.sun.org.apache.xml.internal.dtm.DTMFilter;
27 import com.sun.org.apache.xpath.internal.XPathContext;
28 import com.sun.org.apache.xpath.internal.axes.WalkerFactory;
29 import com.sun.org.apache.xpath.internal.objects.XObject;
30 /**
31 * Special context node pattern matcher.
32 *
33 * @LastModified: Oct 2017
34 */
35 public class ContextMatchStepPattern extends StepPattern
36 {
37 static final long serialVersionUID = -1888092779313211942L;
38
39 /**
40 * Construct a ContextMatchStepPattern.
41 *
42 */
43 public ContextMatchStepPattern(int axis, int paxis)
44 {
45 super(DTMFilter.SHOW_ALL, axis, paxis);
46 }
47
48 /**
49 * Execute this pattern step, including predicates.
50 *
51 *
52 * @param xctxt XPath runtime context.
53 *
54 * @return {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_NODETEST},
55 * {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_NONE},
56 * {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_NSWILD},
57 * {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_QNAME}, or
58 * {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_OTHER}.
59 *
60 * @throws javax.xml.transform.TransformerException
61 */
62 public XObject execute(XPathContext xctxt)
63 throws javax.xml.transform.TransformerException
64 {
65
66 if (xctxt.getIteratorRoot() == xctxt.getCurrentNode())
67 return getStaticScore();
68 else
69 return NodeTest.SCORE_NONE;
70 }
71
72 /**
73 * Execute the match pattern step relative to another step.
74 *
75 *
76 * @param xctxt The XPath runtime context.
77 * NEEDSDOC @param prevStep
78 *
79 * @return {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_NODETEST},
80 * {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_NONE},
81 * {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_NSWILD},
82 * {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_QNAME}, or
83 * {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_OTHER}.
84 *
85 * @throws javax.xml.transform.TransformerException
86 */
87 public XObject executeRelativePathPattern(
88 XPathContext xctxt, StepPattern prevStep)
89 throws javax.xml.transform.TransformerException
90 {
91
92 XObject score = NodeTest.SCORE_NONE;
93 int context = xctxt.getCurrentNode();
94 DTM dtm = xctxt.getDTM(context);
95
96 if (null != dtm)
97 {
98 int predContext = xctxt.getCurrentNode();
99 DTMAxisTraverser traverser;
100
101 int axis = m_axis;
102
103 boolean needToTraverseAttrs = WalkerFactory.isDownwardAxisOfMany(axis);
104 boolean iterRootIsAttr = (dtm.getNodeType(xctxt.getIteratorRoot())
105 == DTM.ATTRIBUTE_NODE);
106
107 if((Axis.PRECEDING == axis) && iterRootIsAttr)
108 {
109 axis = Axis.PRECEDINGANDANCESTOR;
110 }
111
112 traverser = dtm.getAxisTraverser(axis);
113
114 for (int relative = traverser.first(context); DTM.NULL != relative;
115 relative = traverser.next(context, relative))
116 {
117 try
118 {
119 xctxt.pushCurrentNode(relative);
120
121 score = execute(xctxt);
122
123 if (score != NodeTest.SCORE_NONE)
124 {
125 //score = executePredicates( xctxt, prevStep, SCORE_OTHER,
126 // predContext, relative);
127 if (executePredicates(xctxt, dtm, context))
128 return score;
129
130 score = NodeTest.SCORE_NONE;
131 }
132
133 if(needToTraverseAttrs && iterRootIsAttr
134 && (DTM.ELEMENT_NODE == dtm.getNodeType(relative)))
135 {
136 int xaxis = Axis.ATTRIBUTE;
137 for (int i = 0; i < 2; i++)
138 {
139 DTMAxisTraverser atraverser = dtm.getAxisTraverser(xaxis);
140
141 for (int arelative = atraverser.first(relative);
142 DTM.NULL != arelative;
143 arelative = atraverser.next(relative, arelative))
144 {
145 try
146 {
147 xctxt.pushCurrentNode(arelative);
148
149 score = execute(xctxt);
150
151 if (score != NodeTest.SCORE_NONE)
152 {
153 //score = executePredicates( xctxt, prevStep, SCORE_OTHER,
154 // predContext, arelative);
155
156 if (score != NodeTest.SCORE_NONE)
157 return score;
158 }
159 }
160 finally
161 {
162 xctxt.popCurrentNode();
163 }
164 }
165 xaxis = Axis.NAMESPACE;
166 }
167 }
168
169 }
170 finally
171 {
172 xctxt.popCurrentNode();
173 }
174 }
175
176 }
177
178 return score;
179 }
180
181 }