Mercurial > dive4elements > framework
comparison artifact-database/src/main/java/de/intevation/artifactdatabase/transition/TransitionEngine.java @ 108:9ece61d918b1
Improved the StateEngine and the TransitionEngine to retrieve the reachable states of a current state.
artifacts/trunk@1297 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
|---|---|
| date | Mon, 07 Feb 2011 11:20:31 +0000 |
| parents | 26bfff409dd3 |
| children | 973f244ed568 |
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| 107:39d9391059bd | 108:9ece61d918b1 |
|---|---|
| 1 package de.intevation.artifactdatabase.transition; | 1 package de.intevation.artifactdatabase.transition; |
| 2 | 2 |
| 3 import java.util.ArrayList; | |
| 3 import java.util.HashMap; | 4 import java.util.HashMap; |
| 4 import java.util.List; | 5 import java.util.List; |
| 5 import java.util.Map; | 6 import java.util.Map; |
| 6 | 7 |
| 7 import org.apache.log4j.Logger; | 8 import org.apache.log4j.Logger; |
| 9 | |
| 10 import de.intevation.artifactdatabase.state.State; | |
| 11 import de.intevation.artifactdatabase.state.StateEngine; | |
| 12 | |
| 8 | 13 |
| 9 /** | 14 /** |
| 10 * The TransitionEngine stores all transitions for each Artifact and should be | 15 * The TransitionEngine stores all transitions for each Artifact and should be |
| 11 * used to determine, if an Artifact is able to advance from one to another | 16 * used to determine, if an Artifact is able to advance from one to another |
| 12 * state. | 17 * state. |
| 39 * @param stateId the name of the Artifact. | 44 * @param stateId the name of the Artifact. |
| 40 * @param transitions the list of transition of the artifact. | 45 * @param transitions the list of transition of the artifact. |
| 41 * | 46 * |
| 42 * @return true, if the transitions were added, otherwise false. | 47 * @return true, if the transitions were added, otherwise false. |
| 43 */ | 48 */ |
| 44 public boolean addTransition(String stateId, List transitions) { | 49 public boolean addTransition(String stateId, Transition transition) { |
| 45 List tmp = this.transitions.get(stateId); | 50 List tmp = transitions.get(stateId); |
| 46 | 51 |
| 47 if (tmp != null) { | 52 if (tmp == null) { |
| 48 logger.info( | 53 tmp = new ArrayList<Transition>(); |
| 49 "Transitions for the state '" | |
| 50 + stateId | |
| 51 + "' already stored."); | |
| 52 | |
| 53 return false; | |
| 54 } | 54 } |
| 55 | 55 |
| 56 tmp.add(transition); | |
| 57 | |
| 56 logger.debug("Add new transitions for state '" + stateId + "'"); | 58 logger.debug("Add new transitions for state '" + stateId + "'"); |
| 57 return this.transitions.put(stateId, transitions) != null; | 59 |
| 60 return transitions.put(stateId, tmp) != null; | |
| 61 } | |
| 62 | |
| 63 | |
| 64 /** | |
| 65 * This method returns all existing transitions of a state. | |
| 66 * | |
| 67 * @param state The state | |
| 68 * | |
| 69 * @return the existing transition of <i>state</i>. | |
| 70 */ | |
| 71 public List<Transition> getTransitions(State state) { | |
| 72 return transitions.get(state.getID()); | |
| 73 } | |
| 74 | |
| 75 | |
| 76 /** | |
| 77 * This method returns the reachable states of <i>state</i>. | |
| 78 * | |
| 79 * @param state The current state. | |
| 80 * @param engine The state engine. | |
| 81 * | |
| 82 * @return a list of reachable states. | |
| 83 */ | |
| 84 public List<State> getReachableStates(State state, StateEngine engine) { | |
| 85 List<Transition> transitions = getTransitions(state); | |
| 86 List<State> reachable = new ArrayList<State>(); | |
| 87 | |
| 88 for (Transition t: transitions) { | |
| 89 if (t.isValid(state)) { | |
| 90 reachable.add(engine.getState(t.getTo())); | |
| 91 } | |
| 92 } | |
| 93 | |
| 94 return reachable; | |
| 58 } | 95 } |
| 59 } | 96 } |
| 60 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : | 97 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |