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
|
/* ExpressionSaver.java
* =========================================================================
* This file is part of the GrInvIn project - http://www.grinvin.org
*
* Copyright (C) 2005-2008 Universiteit Gent
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* A copy of the GNU General Public License can be found in the file
* LICENSE.txt provided with the source distribution of this program (see
* the META-INF directory in the source jar). This license can also be
* found on the GNU website at http://www.gnu.org/licenses/gpl.html.
*
* If you did not receive a copy of the GNU General Public License along
* with this program, contact the lead developer, or write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
package org.grinvin.expr;
import org.grinvin.invariants.Invariant;
import org.grinvin.list.ExpressionList;
import org.jdom.Element;
/**
* Helper methods for saving expressions to disk.
*/
public class ExpressionSaver implements Expression.Visitor {
private ExpressionSaver() {
// not to be instantiated
}
//
private Element element;
private void setElement(Element element) {
this.element = element;
}
//
@SuppressWarnings("PMD.SingularField")
private ExpressionSaver childVisitor;
/**
* Get a visitor for visiting children of expressions.
*/
private ExpressionSaver getChildVisitor() {
if (childVisitor == null)
childVisitor = new ExpressionSaver();
return childVisitor;
}
/**
* Save the given list of expressions into the given JDOM element.
*/
public static void save(ExpressionList list, Element element) {
ExpressionSaver saver = new ExpressionSaver();
saver.setElement(element);
for (Expression expr: list)
expr.accept(saver);
}
/**
* Save the given expression into the given JDOM element.
*/
public static void save(Expression expression, Element element) {
if(expression==null)
return;
ExpressionSaver saver = new ExpressionSaver();
saver.setElement(element);
expression.accept(saver);
}
public void visitInvariant(Invariant invariant) {
element.addContent(
new Element("invariant").setAttribute("id", invariant.getId())
);
}
public void visitCompound(Compound compound) {
Element child = new Element ("compound");
Operator operator = compound.getOperator();
child.setAttribute("operator", operator.toString());
getChildVisitor().setElement(child);
for (int i=0; i < operator.getNumberOfArguments(); i++)
compound.getChild(i).accept(childVisitor);
element.addContent(child);
}
public void visitIntegerLiteral(IntegerLiteral literal) {
element.addContent(
new Element("integer").setAttribute("value", literal.toString())
);
}
}
|
