src/test/java/org/apache/commons/scxml2/env/groovy/datamodel-01.xml

<?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 -->
<scxml xmlns="http://www.w3.org/2005/07/scxml"
       version="1.0"
       datamodel="groovy"
       initial="main">

    <!-- Root or document datamodel -->
    <datamodel>
        <data id="docdata">{ "root" : { "foo" : { "bar" : "alpha" } } }</data>
    </datamodel>

    <state id="main">

        <initial>
            <transition target="ten"/>
        </initial>

        <!-- datamodel scoped to state "main" -->
        <datamodel>
            <!-- Degenerate usage, similar to the <var> element -->
            <data id="mainvar" expr="0" />
            <!-- Usage where the value is an JSON model -->
            <data id="maindata">{ "root" : { "a" : { "b" : { "c" : "beta", "d" : 123, "e" : 456.789 } } } }</data>
        </datamodel>

        <state id="ten">
            <onentry>
                <assign location="mainvar" expr="10" />
            </onentry>
            <transition event="done.state.ten"
             cond="mainvar eq 10 and maindata.root.a.b.c eq 'beta'"
             target="twenty" />
            <onexit>
                <assign location="maindata.root.a.b.c" expr="'gamma'" />
            </onexit>
        </state>

        <state id="twenty">
            <onentry>
                <assign location="mainvar" expr="20" />
            </onentry>
            <transition event="done.state.twenty"
             cond="maindata.root.a.b.c eq 'gamma' and mainvar eq 20"
             target="thirty" />
            <onexit>
                <assign location="docdata.root.foo"
                        expr="maindata.root" />
            </onexit>
        </state>

        <state id="thirty">
            <!-- Arithmetic operations.
                 Note that data "docdata"
                 did not have data at 'root.foo.a.b.d' to begin with,
                 the data model was manipulated by the <assign> above -->
            <transition event="done.state.thirty"
             cond="docdata.root.foo.a.b.d + docdata.root.foo.a.b.e eq 579.789"
             target="forty" />
        </state>

        <final id="forty"/>

    </state>

</scxml>