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annotate artifact-database/src/main/java/de/intevation/artifactdatabase/transition/TransitionEngine.java @ 244:3d14fe6e05f7

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Improved the describe() of a State - a reference to an artifact has been added. artifacts/trunk@1683 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 14 Apr 2011 08:26:25 +0000
parents 973f244ed568
children 8c2b6cdf22ad
rev   line source
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1 package de.intevation.artifactdatabase.transition;
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2
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3 import java.util.ArrayList;
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4 import java.util.HashMap;
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5 import java.util.List;
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6 import java.util.Map;
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7
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8 import org.apache.log4j.Logger;
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9
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10 import de.intevation.artifactdatabase.state.State;
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11 import de.intevation.artifactdatabase.state.StateEngine;
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12
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13
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14 /**
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15 * The TransitionEngine stores all transitions for each Artifact and should be
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16 * used to determine, if an Artifact is able to advance from one to another
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17 * state.
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18 *
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19 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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20 */
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21 public class TransitionEngine {
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22
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23 /** The logger used in this class. */
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24 private static Logger logger = Logger.getLogger(TransitionEngine.class);
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25
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26 /**
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27 * A map that contains the transitions of the artifacts. The key is the name
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28 * of the artifact, its value is a list of all transitions of this artifact.
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29 */
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30 protected Map<String, List> transitions;
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31
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32
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33 /**
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34 * The default constructor.
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35 */
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36 public TransitionEngine() {
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37 transitions = new HashMap<String, List>();
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38 }
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40
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41 /**
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42 * Add new transitions for a specific artifact.
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43 *
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44 * @param stateId the name of the Artifact.
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45 * @param transitions the list of transition of the artifact.
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46 *
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47 * @return true, if the transitions were added, otherwise false.
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48 */
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49 public boolean addTransition(String stateId, Transition transition) {
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50 List tmp = transitions.get(stateId);
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52 if (tmp == null) {
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53 tmp = new ArrayList<Transition>();
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54 }
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56 tmp.add(transition);
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57
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58 logger.debug("Add new transitions for state '" + stateId + "'");
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59
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60 return transitions.put(stateId, tmp) != null;
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61 }
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62
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63
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64 /**
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65 * This method returns all existing transitions of a state.
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66 *
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67 * @param state The state
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68 *
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69 * @return the existing transition of <i>state</i>.
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70 */
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71 public List<Transition> getTransitions(State state) {
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72 return transitions.get(state.getID());
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73 }
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74
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75
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76 /**
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77 * This method returns the reachable states of <i>state</i>.
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78 *
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79 * @param state The current state.
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80 * @param engine The state engine.
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81 *
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82 * @return a list of reachable states.
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83 */
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84 public List<State> getReachableStates(State state, StateEngine engine) {
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85 List<Transition> transitions = getTransitions(state);
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86 List<State> reachable = new ArrayList<State>();
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87
201
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88 if (transitions == null) {
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89 return reachable;
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90 }
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91
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92 for (Transition t: transitions) {
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93 if (t.isValid(state)) {
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94 reachable.add(engine.getState(t.getTo()));
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95 }
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96 }
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97
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98 return reachable;
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99 }
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100
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101
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102 /**
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103 * Determines if a state with a given identifier is reachable from a current
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104 * state.
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105 *
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106 * @param targetId The identifier of the target state.
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107 * @param state The start state.
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108 * @param stateEngine The StateEngine.
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109 *
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110 * @return true, if the target state is reachable, otherwise false.
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111 */
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112 public boolean isStateReachable(
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113 String targetId,
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114 State state,
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115 StateEngine stateEngine)
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116 {
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117 List<State> reachable = getReachableStates(state, stateEngine);
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118
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119 if (reachable == null || reachable.size() == 0) {
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120 return false;
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121 }
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122
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123 for (State s: reachable) {
973f244ed568 Improved the TransitionEngine with a method that determines if a State B is reachable from a State A.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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124 if (targetId.equals(s.getID())) {
973f244ed568 Improved the TransitionEngine with a method that determines if a State B is reachable from a State A.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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125 return true;
973f244ed568 Improved the TransitionEngine with a method that determines if a State B is reachable from a State A.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 108
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126 }
973f244ed568 Improved the TransitionEngine with a method that determines if a State B is reachable from a State A.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 108
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127 }
973f244ed568 Improved the TransitionEngine with a method that determines if a State B is reachable from a State A.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 108
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128
973f244ed568 Improved the TransitionEngine with a method that determines if a State B is reachable from a State A.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 108
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129 return false;
973f244ed568 Improved the TransitionEngine with a method that determines if a State B is reachable from a State A.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 108
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130 }
104
26bfff409dd3 Added interfaces and engines used in concrete artifact packages.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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131 }
26bfff409dd3 Added interfaces and engines used in concrete artifact packages.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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132 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org