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
|
<?xml version="1.0"?>
<!--
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
-->
<!-- A fictitious state machine used by test cases.
Meant to illustrate the usage of SCXML <datamodel> element
and the Commons SCXML Data() function -->
<scxml xmlns="http://www.w3.org/2005/07/scxml"
version="1.0"
initialstate="main">
<!-- Root or document datamodel -->
<datamodel>
<data id="docdata">
<root xmlns="">
<foo>foo</foo>
</root>
</data>
</datamodel>
<state id="main">
<initial>
<transition target="ten"/>
</initial>
<!-- datamodel scoped to state "main" -->
<datamodel>
<data id="mainvar" expr="${0}" />
<data id="maindata">
<root xmlns="">
<foo>
<bar>bar</bar>
</foo>
</root>
</data>
</datamodel>
<state id="ten">
<onentry>
<!-- Assign Usage 1: name is previously defined
<var> or degenerate <data> (as in this case) -->
<assign name="mainvar" expr="${10}" />
</onentry>
<!-- Commons SCXML defines a Data() function to use in conjunction
with the Commons EL expression language. The
first argument is the named XML data tree and the second is
the XPath expression to a node whose value is to be
examined -->
<transition event="ten.done"
cond="${mainvar eq 10 and Data(maindata,'root/foo/bar') eq 'bar'}"
target="twenty" />
<onexit>
<!-- Assign Usage 2: location must point to an existing
node -->
<assign location="${Data(maindata,'root/foo/bar')}" expr="baz" />
</onexit>
</state>
<state id="twenty">
<onentry>
<assign name="mainvar" expr="${20}" />
</onentry>
<transition event="twenty.done"
cond="${Data(maindata,'root/foo/bar') eq 'baz' and mainvar eq 20}"
target="thirty" />
<onexit>
<!-- Assign Usage 3: location points to an existing
node, and expr points to an existing node.
In this case, location adopts expr's child nodes. -->
<assign location="${Data(docdata,'root/foo')}"
expr="${Data(maindata,'root/foo')}" />
<assign location="${Data(docdata,'root/foo/bar')}"
expr="${10}" />
</onexit>
</state>
<state id="thirty">
<!-- Arithmetic operations are possible with results from
the Data() function. Note that data "docdata"
did not have a node at 'root/foo/bar' to begin with,
the XML tree was manipulated by the <assign> above -->
<transition event="thirty.done"
cond="${Data(docdata,'root/foo/bar') gt 5}"
target="forty" />
</state>
<state id="forty" final="true" />
</state>
</scxml>
|
