1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/*******************************************************************************
* Copyright (c) 2004-2010 Gabor Bergmann and Daniel Varro
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package tools.refinery.viatra.runtime.base.comprehension;
import org.eclipse.emf.ecore.EAttribute;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.emf.ecore.resource.Resource;
/**
* Use EMFModelComprehension to visit an EMF model.
*
* @author Bergmann Gábor
*
*/
// FIXME:
// - handle boundary of active emfRoot subtree
// - more efficient traversal
public class EMFVisitor {
boolean preOrder;
public EMFVisitor(boolean preOrder) {
super();
this.preOrder = preOrder;
}
/**
* @param resource
* @param element
*/
public void visitTopElementInResource(Resource resource, EObject element) {
}
/**
* @param resource
*/
public void visitResource(Resource resource) {
}
/**
* @param source
*/
public void visitElement(EObject source) {
}
/**
* @param source
* @param feature
* @param target
*/
public void visitNonContainmentReference(EObject source, EReference feature, EObject target) {
}
/**
* @param source
* @param feature
* @param target
*/
public void visitInternalContainment(EObject source, EReference feature, EObject target) {
}
/**
* @param source
* @param feature
* @param target
*/
public void visitAttribute(EObject source, EAttribute feature, Object target) {
}
/**
* Returns true if the given feature should not be traversed (interesting esp. if multi-valued)
*/
public boolean pruneFeature(EStructuralFeature feature) {
return false;
}
/**
* Returns true if the contents of an object should be pruned (and not explored by the visitor)
*/
public boolean pruneSubtrees(EObject source) {
return false;
}
/**
* Returns true if the contents of a resource should be pruned (and not explored by the visitor)
*/
public boolean pruneSubtrees(Resource source) {
return false;
}
/**
* An opportunity for the visitor to indicate that the containment link is considered in a transient state, and the
* model comprehension should avoid following it.
*
* A containment is in a transient state from the point of view of the visitor if it connects a subtree that is
* being inserted <em>during</em> a full-model traversal, and a separate notification handler will deal with it
* later.
*/
public boolean avoidTransientContainmentLink(EObject source, EReference reference, EObject targetObject) {
return false;
}
/**
* @return if objects should be visited before their outgoing edges
*/
public boolean preOrder() {
return preOrder;
}
/**
* Called after visiting the reference, if the target is a proxy.
*
* @param position
* optional: known position in multivalued collection (for more efficient proxy resolution)
*/
public void visitProxyReference(EObject source, EReference reference, EObject targetObject, Integer position) {
}
/**
* Whether the given reference of the given object should be resolved when it is a proxy
*/
public boolean attemptProxyResolutions(EObject source, EReference feature) {
return true;
}
/**
* @return true if traversing visitors shall descend along cross-resource containments
* (this only makes sense for traversing visitors on an object scope)
*
* @since 1.7
*/
public boolean descendAlongCrossResourceContainments() {
return false;
}
}
|
