001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.commons.scxml.semantics; 018 019 /** 020 * Errors reported by the default SCXMLSemantics implementation. 021 * 022 */ 023 public class ErrorConstants { 024 025 /** 026 * Missing initial state for a composite state or for the scxml root. 027 * 028 * @see org.apache.commons.scxml.model.SCXML#getInitialState() 029 * @see org.apache.commons.scxml.model.State#getInitial() 030 */ 031 public static final String NO_INITIAL = "NO_INITIAL"; 032 033 /** 034 * An initial state for a composite state whose Transition does not. 035 * Map to a descendant of the composite state. 036 * 037 */ 038 public static final String ILLEGAL_INITIAL = "ILLEGAL_INITIAL"; 039 040 /** 041 * Unknown action - unsupported executable content. List of supported. 042 * actions: assign, cancel, elseif, else, if, log, send, var 043 */ 044 public static final String UNKNOWN_ACTION = "UNKNOWN_ACTION"; 045 046 /** 047 * Illegal state machine configuration. 048 * Either a parallel exists which does not have all its AND sub-states 049 * active or there are multiple enabled OR states on the same level. 050 */ 051 public static final String ILLEGAL_CONFIG = "ILLEGAL_CONFIG"; 052 053 /** 054 * Non-deterministic situation has occured - there are more than 055 * one enabled transitions in conflict. 056 * 057 * @deprecated Non deterministic behavior is now resolved using 058 * state heirarchy and document order priorities. 059 */ 060 public static final String NON_DETERMINISTIC = "NON_DETERMINISTIC"; 061 062 /** 063 * A variable referred to by assign name attribute is undefined. 064 */ 065 public static final String UNDEFINED_VARIABLE = "UNDEFINED_VARIABLE"; 066 067 /** 068 * An expression language error. 069 */ 070 public static final String EXPRESSION_ERROR = "EXPRESSION_ERROR"; 071 072 //---------------------------------------------- STATIC CONSTANTS ONLY 073 074 /** 075 * Discourage instantiation. 076 */ 077 private ErrorConstants() { 078 super(); // humor checkstyle 079 } 080 081 }