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annotate artifact-database/src/main/java/de/intevation/artifactdatabase/transition/TransitionEngine.java @ 265:d52947ce8629

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XMLUtils.xpathString() returns empty string not null. artifacts/trunk@1976 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 23 May 2011 09:56:15 +0000
parents 8c2b6cdf22ad
children f367be55dd35
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.artifacts.Artifact;
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12 import de.intevation.artifactdatabase.state.State;
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13 import de.intevation.artifactdatabase.state.StateEngine;
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14
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16 /**
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17 * The TransitionEngine stores all transitions for each Artifact and should be
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18 * used to determine, if an Artifact is able to advance from one to another
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19 * state.
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20 *
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21 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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22 */
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23 public class TransitionEngine {
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24
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25 /** The logger used in this class. */
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26 private static Logger logger = Logger.getLogger(TransitionEngine.class);
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27
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28 /**
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29 * A map that contains the transitions of the artifacts. The key is the name
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30 * of the artifact, its value is a list of all transitions of this artifact.
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31 */
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32 protected Map<String, List> transitions;
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33
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34
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35 /**
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36 * The default constructor.
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37 */
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38 public TransitionEngine() {
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39 transitions = new HashMap<String, List>();
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40 }
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43 /**
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44 * Add new transitions for a specific artifact.
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45 *
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46 * @param stateId the name of the Artifact.
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47 * @param transitions the list of transition of the artifact.
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48 *
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49 * @return true, if the transitions were added, otherwise false.
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50 */
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51 public boolean addTransition(String stateId, Transition transition) {
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52 List tmp = transitions.get(stateId);
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53
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54 if (tmp == null) {
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55 tmp = new ArrayList<Transition>();
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56 }
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57
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58 tmp.add(transition);
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59
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60 logger.debug("Add new transitions for state '" + stateId + "'");
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61
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62 return transitions.put(stateId, tmp) != null;
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63 }
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64
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65
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66 /**
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67 * This method returns all existing transitions of a state.
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68 *
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69 * @param state The state
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70 *
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71 * @return the existing transition of <i>state</i>.
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72 */
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73 public List<Transition> getTransitions(State state) {
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74 return transitions.get(state.getID());
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75 }
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76
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77
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78 /**
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79 * This method returns the reachable states of <i>state</i>.
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80 *
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81 * @param state The current state.
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82 * @param engine The state engine.
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83 *
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84 * @return a list of reachable states.
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85 */
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86 public List<State> getReachableStates(
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87 Artifact artifact,
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88 State state,
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89 StateEngine engine) {
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90 List<Transition> transitions = getTransitions(state);
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91 List<State> reachable = new ArrayList<State>();
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92
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93 if (transitions == null) {
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94 return reachable;
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95 }
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96
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97 for (Transition t: transitions) {
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98 State target = engine.getState(t.getTo());
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99
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100 if (t.isValid(artifact, state, target)) {
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101 reachable.add(target);
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102 }
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103 }
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104
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105 return reachable;
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106 }
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107
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108
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109 /**
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110 * Determines if a state with a given identifier is reachable from a current
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111 * state.
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112 *
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113 * @param artifact The owner artifact of state <i>state</i>.
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114 * @param targetId The identifier of the target state.
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115 * @param state The start state.
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116 * @param stateEngine The StateEngine.
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117 *
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118 * @return true, if the target state is reachable, otherwise false.
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119 */
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120 public boolean isStateReachable(
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121 Artifact artifact,
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122 String targetId,
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123 State state,
973f244ed568 Improved the TransitionEngine with a method that determines if a State B is reachable from a State A.
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124 StateEngine stateEngine)
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parents: 108
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125 {
257
8c2b6cdf22ad Modified Transition.isValid() - added the artifact and the current state to the parameter list.
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126 List<State> reachable = getReachableStates(artifact, state,stateEngine);
201
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127
973f244ed568 Improved the TransitionEngine with a method that determines if a State B is reachable from a State A.
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parents: 108
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128 if (reachable == null || reachable.size() == 0) {
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129 return false;
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parents: 108
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130 }
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parents: 108
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131
973f244ed568 Improved the TransitionEngine with a method that determines if a State B is reachable from a State A.
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parents: 108
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132 for (State s: reachable) {
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133 if (targetId.equals(s.getID())) {
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parents: 108
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134 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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135 }
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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136 }
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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137
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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138 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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139 }
104
26bfff409dd3 Added interfaces and engines used in concrete artifact packages.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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140 }
26bfff409dd3 Added interfaces and engines used in concrete artifact packages.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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141 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org