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annotate artifact-database/src/main/java/org/dive4elements/artifactdatabase/transition/TransitionEngine.java @ 500:cbe3dfd3e1a6 3.0.15

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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).
author Sascha L. Teichmann <teichmann@intevation.de>
date Tue, 27 Aug 2013 15:48:26 +0200
parents 415df0fc4fa1
children 584591f8203c
rev   line source
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1 package org.dive4elements.artifactdatabase.transition;
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2
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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.log4j.Logger;
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14 import org.dive4elements.artifacts.Artifact;
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16 import org.dive4elements.artifactdatabase.state.State;
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17 import org.dive4elements.artifactdatabase.state.StateEngine;
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20 /**
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21 * The TransitionEngine stores all transitions for each Artifact and should be
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22 * used to determine, if an Artifact is able to advance from one to another
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23 * state.
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24 *
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25 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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26 */
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27 public class TransitionEngine {
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29 /** The logger used in this class. */
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30 private static Logger logger = Logger.getLogger(TransitionEngine.class);
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32 /**
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33 * A map that contains the transitions of the artifacts. The key is the name
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34 * of the artifact, its value is a list of all transitions of this artifact.
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35 */
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36 protected Map<String, List> transitions;
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39 /**
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40 * The default constructor.
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41 */
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42 public TransitionEngine() {
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43 transitions = new HashMap<String, List>();
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44 }
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47 /**
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48 * Add new transitions for a specific artifact.
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49 *
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50 * @param stateId the name of the Artifact.
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51 * @param transition the list of transition of the artifact.
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52 *
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53 * @return true, if the transitions were added, otherwise false.
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54 */
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55 public boolean addTransition(String stateId, Transition transition) {
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56 List tmp = transitions.get(stateId);
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58 if (tmp == null) {
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59 tmp = new ArrayList<Transition>();
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60 }
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62 tmp.add(transition);
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64 logger.debug("Add new transitions for state '" + stateId + "'");
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65
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66 return transitions.put(stateId, tmp) != null;
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67 }
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70 /**
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71 * This method returns all existing transitions of a state.
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72 *
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73 * @param state The state
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74 *
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75 * @return the existing transition of <i>state</i>.
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76 */
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77 public List<Transition> getTransitions(State state) {
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78 return transitions.get(state.getID());
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79 }
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80
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81
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82 /**
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83 * This method returns the reachable states of <i>state</i>.
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84 *
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85 * @param state The current state.
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86 * @param engine The state engine.
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87 *
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88 * @return a list of reachable states.
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89 */
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90 public List<State> getReachableStates(
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91 Artifact artifact,
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92 State state,
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93 StateEngine engine) {
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94 List<Transition> transitions = getTransitions(state);
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95 List<State> reachable = new ArrayList<State>();
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97 if (transitions == null) {
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98 return reachable;
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99 }
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100
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101 for (Transition t: transitions) {
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102 State target = engine.getState(t.getTo());
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103
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104 if (t.isValid(artifact, state, target)) {
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105 reachable.add(target);
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106 }
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107 }
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108
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109 return reachable;
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110 }
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112 /** Returns all recursive reachable state ids for
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113 * a given pair of artifact id and state id.
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114 */
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115 public Set<String> allRecursiveSuccessorStateIds(
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116 String artifactIdentifier,
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117 String stateId
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118 ) {
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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119 HashSet<String> result = new HashSet<String>();
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120
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121 List<Transition> trans = transitions.get(artifactIdentifier);
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122
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123 if (trans == null) {
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124 return result;
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125 }
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126
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127 Map<String, Set<String>> succs = new HashMap<String, Set<String>>();
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128
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129 for (Transition t: trans) {
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130 String from = t.getFrom();
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131 String to = t.getTo();
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132
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133 Set<String> s = succs.get(from);
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134 if (s == null) {
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135 s = new HashSet<String>();
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136 succs.put(from, s);
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137 }
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138 s.add(to);
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139 }
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140
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141 Set<String> start = succs.get(stateId);
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142
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143 if (start == null) {
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144 return result;
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145 }
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146
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147 Deque<String> open = new ArrayDeque<String>(start);
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148
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149 while (!open.isEmpty()) {
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150 String cand = open.pop();
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151 if (result.add(cand)) {
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152 Set<String> s = succs.get(cand);
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153 if (s != null) {
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154 open.addAll(s);
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155 }
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156 }
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157 }
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158
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159 return result;
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160 }
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161
201
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162
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163 /**
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164 * Determines if a state with a given identifier is reachable from a current
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165 * state.
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166 *
257
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167 * @param artifact The owner artifact of state <i>state</i>.
201
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168 * @param targetId The identifier of the target state.
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169 * @param state The start state.
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170 * @param stateEngine The StateEngine.
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171 *
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172 * @return true, if the target state is reachable, otherwise false.
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173 */
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174 public boolean isStateReachable(
257
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175 Artifact artifact,
201
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176 String targetId,
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177 State state,
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178 StateEngine stateEngine)
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179 {
257
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180 List<State> reachable = getReachableStates(artifact, state,stateEngine);
201
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181
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182 if (reachable == null || reachable.size() == 0) {
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183 return false;
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184 }
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185
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186 for (State s: reachable) {
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187 if (targetId.equals(s.getID())) {
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188 return true;
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189 }
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190 }
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191
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192 return false;
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193 }
104
26bfff409dd3 Added interfaces and engines used in concrete artifact packages.
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194 }
26bfff409dd3 Added interfaces and engines used in concrete artifact packages.
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195 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org