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annotate artifact-database/src/main/java/de/intevation/artifactdatabase/state/FacetActivity.java @ 436:15179c77aa1d flys-2.9.3

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Documentation, so that readers know a tiny bit more what is going on.
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Tue, 16 Oct 2012 15:08:43 +0200
parents e1738650bfca
children f3bf22423c95
rev   line source
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1 package de.intevation.artifactdatabase.state;
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2
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3 import de.intevation.artifacts.Artifact;
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4
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5 import java.util.ArrayList;
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6 import java.util.HashMap;
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7 import java.util.List;
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8 import java.util.Map;
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9
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10
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11 /** Magical system. */
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12 public interface FacetActivity
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13 {
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14 /** Static 'activity' that lets all facets be active. */
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15 public static final FacetActivity ACTIVE = new FacetActivity() {
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16 @Override
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17 public Boolean isInitialActive(
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18 Artifact artifact,
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19 Facet facet,
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20 String output
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21 ) {
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22 return Boolean.TRUE;
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23 }
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24 };
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25
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26 /** Static 'activity' that lets all facets be inactive. */
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27 public static final FacetActivity INACTIVE = new FacetActivity() {
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28 @Override
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29 public Boolean isInitialActive(
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30 Artifact artifact,
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31 Facet facet,
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32 String output
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33 ) {
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34 return Boolean.FALSE;
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35 }
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36 };
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37
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38 Boolean isInitialActive(Artifact artifact, Facet facet, String output);
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39
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40 /** Singleton registry, that maps artifact names to the activities, which
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41 * decide whether or not a facet should be (initially) active. */
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42 public static final class Registry {
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43
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44 /** Singleton instance. */
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45 private static final Registry INSTANCE = new Registry();
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46
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47 private Map<String, List<FacetActivity>> activities;
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48
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49 /** Private singleton constructor for the Facet-Activity-Registry. */
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50 private Registry() {
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51 activities = new HashMap<String, List<FacetActivity>>();
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52 }
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53
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54 /** Access Singleton instance. */
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55 public static Registry getInstance() {
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56 return INSTANCE;
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57 }
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58
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59 /** Queries whether a given facet should be active or not. */
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60 public synchronized boolean isInitialActive(
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61 String key,
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62 Artifact artifact,
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63 Facet facet,
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64 String output
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65 ) {
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66 List<FacetActivity> activityList = activities.get(key);
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67 if (activityList == null) {
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68 return true;
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69 }
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70 for (FacetActivity activity: activityList) {
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71 Boolean isActive =
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72 activity.isInitialActive(artifact, facet, output);
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73 if (isActive != null) {
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74 return isActive;
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75 }
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76 }
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77 return true;
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78 }
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79
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80 public synchronized void register(String key, FacetActivity activity) {
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81 List<FacetActivity> activityList = activities.get(key);
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82 if (activityList == null) {
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83 activityList = new ArrayList<FacetActivity>(3);
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84 activities.put(key, activityList);
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85 }
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86 activityList.add(activity);
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87 }
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88 }
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89 }
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90 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org