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annotate artifact-database/src/main/java/de/intevation/artifactdatabase/state/FacetActivity.java @ 453:a2efc9d65a11 2.9.8

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author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Fri, 28 Dec 2012 13:32:32 +0100
parents f503374f516c
children
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 import org.apache.log4j.Logger;
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11
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12
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13 /**
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14 * System used in practice used by AttributeWriter in flys-artifacts to decide
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15 * whether a facet is initially active.
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16 * Provides a singleton Registry into which FacetActivities can be registered
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17 * under a key (in practice the artifacts name. This Registry is queried for
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18 * new Facets in order to find whether they are active or inactive.
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19 */
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20 public interface FacetActivity
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21 {
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22 /** Static 'activity' that lets all facets be active. */
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23 public static final FacetActivity ACTIVE = new FacetActivity() {
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24 @Override
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25 public Boolean isInitialActive(
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26 Artifact artifact,
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27 Facet facet,
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28 String output
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29 ) {
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30 return Boolean.TRUE;
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31 }
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32 };
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33
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34 /** Static 'activity' that lets all facets be inactive. */
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35 public static final FacetActivity INACTIVE = new FacetActivity() {
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36 @Override
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37 public Boolean isInitialActive(
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38 Artifact artifact,
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39 Facet facet,
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40 String output
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41 ) {
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42 return Boolean.FALSE;
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43 }
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44 };
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45
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46 Boolean isInitialActive(Artifact artifact, Facet facet, String output);
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47
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48 /** Singleton registry, that maps artifact names to the activities, which
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49 * decide whether or not a facet should be (initially) active. */
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50 public static final class Registry {
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51
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52 /** The logger for this class. */
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53 private static Logger logger = Logger.getLogger(Registry.class);
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54
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55 /** Singleton instance. */
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56 private static final Registry INSTANCE = new Registry();
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57
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58 /** Map of keys (artifact names) to the activities. */
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59 private Map<String, List<FacetActivity>> activities;
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60
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61 /** Private singleton constructor for the Facet-Activity-Registry. */
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62 private Registry() {
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63 activities = new HashMap<String, List<FacetActivity>>();
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64 }
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65
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66 /** Access Singleton instance. */
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67 public static Registry getInstance() {
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68 return INSTANCE;
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69 }
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70
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71 /** Queries whether a given facet should be active or not. */
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72 public synchronized boolean isInitialActive(
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73 String key,
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74 Artifact artifact,
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75 Facet facet,
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76 String output
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77 ) {
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78 List<FacetActivity> activityList = activities.get(key);
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79 if (activityList == null) {
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80 logger.debug("FacetActivity.Registry: No activity " +
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81 "registered for " + key);
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82 return true;
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83 }
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84 if (activityList.size() != 1) {
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85 logger.warn("FacetActivity.Registry: More than one " +
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86 "FacetActivity registered for " + key);
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87 }
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88 for (FacetActivity activity: activityList) {
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89 Boolean isActive =
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90 activity.isInitialActive(artifact, facet, output);
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91 // Nice. Only, in practice they never return NULL.
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92 if (isActive != null) {
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93 return isActive;
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94 }
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95 }
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96 return true;
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97 }
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98
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99
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100 /** Add a FacetActivity under given key (usually artifacts name). */
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101 public synchronized void register(String key, FacetActivity activity) {
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102 List<FacetActivity> activityList = activities.get(key);
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103 if (activityList == null) {
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104 activityList = new ArrayList<FacetActivity>(3);
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105 activities.put(key, activityList);
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106 }
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107 activityList.add(activity);
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108 }
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109 }
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110 }
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111 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org