Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/org/dive4elements/artifactdatabase/transition/TransitionEngine.java @ 570:584591f8203c 3.2.x

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Upgrade to Log4j 2
author Tom Gottfried <tom@intevation.de>
date Mon, 28 Feb 2022 17:41:14 +0100
parents cbe3dfd3e1a6
children
rev   line source
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1 package org.dive4elements.artifactdatabase.transition;
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3 import java.util.ArrayDeque;
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4 import java.util.ArrayList;
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5 import java.util.Deque;
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6 import java.util.HashMap;
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7 import java.util.HashSet;
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8 import java.util.List;
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9 import java.util.Map;
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10 import java.util.Set;
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12 import org.apache.logging.log4j.Logger;
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13 import org.apache.logging.log4j.LogManager;
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15 import org.dive4elements.artifacts.Artifact;
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17 import org.dive4elements.artifactdatabase.state.State;
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18 import org.dive4elements.artifactdatabase.state.StateEngine;
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21 /**
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22 * The TransitionEngine stores all transitions for each Artifact and should be
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23 * used to determine, if an Artifact is able to advance from one to another
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24 * state.
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25 *
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26 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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27 */
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28 public class TransitionEngine {
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30 /** The logger used in this class. */
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31 private static Logger logger = LogManager.getLogger(TransitionEngine.class);
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33 /**
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34 * A map that contains the transitions of the artifacts. The key is the name
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35 * of the artifact, its value is a list of all transitions of this artifact.
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36 */
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37 protected Map<String, List> transitions;
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40 /**
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41 * The default constructor.
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42 */
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43 public TransitionEngine() {
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44 transitions = new HashMap<String, List>();
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45 }
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48 /**
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49 * Add new transitions for a specific artifact.
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50 *
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51 * @param stateId the name of the Artifact.
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52 * @param transition the list of transition of the artifact.
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53 *
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54 * @return true, if the transitions were added, otherwise false.
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55 */
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56 public boolean addTransition(String stateId, Transition transition) {
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57 List tmp = transitions.get(stateId);
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59 if (tmp == null) {
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60 tmp = new ArrayList<Transition>();
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61 }
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63 tmp.add(transition);
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64
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65 logger.debug("Add new transitions for state '" + stateId + "'");
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66
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67 return transitions.put(stateId, tmp) != null;
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68 }
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71 /**
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72 * This method returns all existing transitions of a state.
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73 *
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74 * @param state The state
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75 *
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76 * @return the existing transition of <i>state</i>.
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77 */
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78 public List<Transition> getTransitions(State state) {
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79 return transitions.get(state.getID());
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80 }
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81
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82
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83 /**
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84 * This method returns the reachable states of <i>state</i>.
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85 *
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86 * @param state The current state.
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87 * @param engine The state engine.
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88 *
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89 * @return a list of reachable states.
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90 */
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91 public List<State> getReachableStates(
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92 Artifact artifact,
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93 State state,
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94 StateEngine engine) {
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95 List<Transition> transitions = getTransitions(state);
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96 List<State> reachable = new ArrayList<State>();
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98 if (transitions == null) {
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99 return reachable;
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100 }
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102 for (Transition t: transitions) {
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103 State target = engine.getState(t.getTo());
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104
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105 if (t.isValid(artifact, state, target)) {
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106 reachable.add(target);
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107 }
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108 }
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109
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110 return reachable;
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111 }
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113 /** Returns all recursive reachable state ids for
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114 * a given pair of artifact id and state id.
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115 */
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116 public Set<String> allRecursiveSuccessorStateIds(
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117 String artifactIdentifier,
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118 String stateId
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119 ) {
cbe3dfd3e1a6 Framework: Added a method to the transition engine to recursively collect all state id for a given artifact identifer and a state id. Goal is to create a predicate dc:state-successors-contains($artifict-type-identifer, 'winfo.calculation.select, $current-state-id).
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120 HashSet<String> result = new HashSet<String>();
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121
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122 List<Transition> trans = transitions.get(artifactIdentifier);
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123
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124 if (trans == null) {
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125 return result;
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126 }
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127
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128 Map<String, Set<String>> succs = new HashMap<String, Set<String>>();
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129
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130 for (Transition t: trans) {
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131 String from = t.getFrom();
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132 String to = t.getTo();
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133
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134 Set<String> s = succs.get(from);
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135 if (s == null) {
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136 s = new HashSet<String>();
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137 succs.put(from, s);
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138 }
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139 s.add(to);
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140 }
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141
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142 Set<String> start = succs.get(stateId);
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143
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144 if (start == null) {
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145 return result;
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146 }
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147
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148 Deque<String> open = new ArrayDeque<String>(start);
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149
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150 while (!open.isEmpty()) {
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151 String cand = open.pop();
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152 if (result.add(cand)) {
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153 Set<String> s = succs.get(cand);
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154 if (s != null) {
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155 open.addAll(s);
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156 }
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157 }
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158 }
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159
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160 return result;
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161 }
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162
201
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163
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164 /**
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165 * Determines if a state with a given identifier is reachable from a current
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166 * state.
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167 *
257
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168 * @param artifact The owner artifact of state <i>state</i>.
201
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169 * @param targetId The identifier of the target state.
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170 * @param state The start state.
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171 * @param stateEngine The StateEngine.
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172 *
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173 * @return true, if the target state is reachable, otherwise false.
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174 */
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175 public boolean isStateReachable(
257
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176 Artifact artifact,
201
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177 String targetId,
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178 State state,
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179 StateEngine stateEngine)
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180 {
257
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181 List<State> reachable = getReachableStates(artifact, state,stateEngine);
201
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182
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183 if (reachable == null || reachable.size() == 0) {
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184 return false;
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185 }
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186
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187 for (State s: reachable) {
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188 if (targetId.equals(s.getID())) {
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189 return true;
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190 }
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191 }
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192
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193 return false;
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194 }
104
26bfff409dd3 Added interfaces and engines used in concrete artifact packages.
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195 }
26bfff409dd3 Added interfaces and engines used in concrete artifact packages.
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196 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org