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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.scxml.semantics;
18  
19  /***
20   * Errors reported by the default SCXMLSemantics implementation.
21   *
22   */
23  public class ErrorConstants {
24  
25      /***
26       * Missing initial state for a composite state or for the scxml root.
27       *
28       * @see org.apache.commons.scxml.model.SCXML#getInitialState()
29       * @see org.apache.commons.scxml.model.State#getInitial()
30       */
31      public static final String NO_INITIAL = "NO_INITIAL";
32  
33      /***
34       * An initial state for a composite state whose Transition does not.
35       * Map to a descendant of the composite state.
36       *
37       */
38      public static final String ILLEGAL_INITIAL = "ILLEGAL_INITIAL";
39  
40      /***
41       * Unknown action - unsupported executable content. List of supported.
42       * actions: assign, cancel, elseif, else, if, log, send, var
43       */
44      public static final String UNKNOWN_ACTION = "UNKNOWN_ACTION";
45  
46      /***
47       * Illegal state machine configuration.
48       * Either a parallel exists which does not have all its AND sub-states
49       * active or there are multiple enabled OR states on the same level.
50       */
51      public static final String ILLEGAL_CONFIG = "ILLEGAL_CONFIG";
52  
53      /***
54       * Non-deterministic situation has occured - there are more than
55       * one enabled transitions in conflict.
56       */
57      public static final String NON_DETERMINISTIC = "NON_DETERMINISTIC";
58  
59      /***
60       * A variable referred to by assign name attribute is undefined.
61       */
62      public static final String UNDEFINED_VARIABLE = "UNDEFINED_VARIABLE";
63  
64      /***
65       * An expression language error.
66       */
67      public static final String EXPRESSION_ERROR = "EXPRESSION_ERROR";
68  
69      //---------------------------------------------- STATIC CONSTANTS ONLY
70  
71      /***
72       * Discourage instantiation.
73       */
74      private ErrorConstants() {
75          super(); // humor checkstyle
76      }
77  
78  }