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annotate artifact-database/src/main/java/de/intevation/artifactdatabase/state/StateEngine.java @ 343:542caebea773

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Add functionality to get 'oldest' artifact of a collection.' artifacts/trunk@3037 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Wed, 19 Oct 2011 15:55:33 +0000
parents 2ce31a9414ff
children 16ab243507e0
rev   line source
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1 package de.intevation.artifactdatabase.state;
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2
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3 import java.util.HashMap;
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4 import java.util.List;
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5 import java.util.Map;
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6
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7 import org.apache.log4j.Logger;
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8
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9 /**
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10 * The StateEngine stores all states for each Artifact.
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11 *
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12 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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13 */
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14 public class StateEngine {
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15
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16 /** The logger used in this class. */
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17 private static Logger logger = Logger.getLogger(StateEngine.class);
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18
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19 /**
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20 * A map that contains the states of the artifacts. The key of this map is
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21 * the name of an artifact, its value is a list of all states the artifact
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22 * can reach.
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23 */
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24 protected Map<String, List<State>> states;
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26
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27 /**
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28 * A map that contains all existing states. The key of this map is the ID of
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29 * the state, its value is the state itself.
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30 */
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31 protected Map<String, State> allStates;
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32
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33
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34 /**
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35 * The default constructor.
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36 */
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37 public StateEngine() {
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38 states = new HashMap<String, List<State>>();
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39 allStates = new HashMap<String, State>();
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40 }
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41
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42
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43 /**
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44 * This method adds a state into the map <i>allStates</i>.
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45 *
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46 * @param state The state to add.
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47 */
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48 protected void addState(State state) {
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49 allStates.put(state.getID(), state);
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50 }
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51
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52
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53 /**
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54 * Returns the state based on its ID.
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55 *
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56 * @param stateId The ID of the desired state.
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57 *
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58 * @return the state.
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59 */
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60 public State getState(String stateId) {
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61 return allStates.get(stateId);
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62 }
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63
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64
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65 /**
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66 * Add new states for a specific artifact.
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67 *
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68 * @param artifact The name of the artifact.
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69 * @param states A list of states that the artifact can reach.
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70 *
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71 * @return true, if the states were added, otherwise false.
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72 */
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73 public boolean addStates(String artifact, List<State> states) {
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74 List tmp = this.states.get(artifact);
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75
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76 if (tmp != null) {
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77 logger.info(
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78 "States for the artifact '" + artifact + "' already stored.");
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79
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80 return false;
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81 }
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82
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83 // add the state to the map with all existing states
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84 for (State s: states) {
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85 addState(s);
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86 }
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87
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88 logger.debug("Add new states for the artifact '" + artifact + "'");
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89 return this.states.put(artifact, states) != null;
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90 }
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91
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93 /**
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94 * Returns the state list of an artifact specified by its name.
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95 *
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96 * @param artifact The name of the artifact.
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97 *
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98 * @return the list of states of this artifact or <i>null</i> if no states
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99 * are existing for this <i>artifact</i>.
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100 */
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101 public List<State> getStates(String artifact) {
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102 return states.get(artifact);
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103 }
104
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104 }
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105 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org