Mercurial > dive4elements > framework
view artifact-database/src/main/java/de/intevation/artifactdatabase/state/FacetActivity.java @ 436:15179c77aa1d flys-2.9.3
Documentation, so that readers know a tiny bit more what is going on.
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Tue, 16 Oct 2012 15:08:43 +0200 |
parents | e1738650bfca |
children | f3bf22423c95 |
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package de.intevation.artifactdatabase.state; import de.intevation.artifacts.Artifact; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; /** Magical system. */ public interface FacetActivity { /** Static 'activity' that lets all facets be active. */ public static final FacetActivity ACTIVE = new FacetActivity() { @Override public Boolean isInitialActive( Artifact artifact, Facet facet, String output ) { return Boolean.TRUE; } }; /** Static 'activity' that lets all facets be inactive. */ public static final FacetActivity INACTIVE = new FacetActivity() { @Override public Boolean isInitialActive( Artifact artifact, Facet facet, String output ) { return Boolean.FALSE; } }; Boolean isInitialActive(Artifact artifact, Facet facet, String output); /** Singleton registry, that maps artifact names to the activities, which * decide whether or not a facet should be (initially) active. */ public static final class Registry { /** Singleton instance. */ private static final Registry INSTANCE = new Registry(); private Map<String, List<FacetActivity>> activities; /** Private singleton constructor for the Facet-Activity-Registry. */ private Registry() { activities = new HashMap<String, List<FacetActivity>>(); } /** Access Singleton instance. */ public static Registry getInstance() { return INSTANCE; } /** Queries whether a given facet should be active or not. */ public synchronized boolean isInitialActive( String key, Artifact artifact, Facet facet, String output ) { List<FacetActivity> activityList = activities.get(key); if (activityList == null) { return true; } for (FacetActivity activity: activityList) { Boolean isActive = activity.isInitialActive(artifact, facet, output); if (isActive != null) { return isActive; } } return true; } public synchronized void register(String key, FacetActivity activity) { List<FacetActivity> activityList = activities.get(key); if (activityList == null) { activityList = new ArrayList<FacetActivity>(3); activities.put(key, activityList); } activityList.add(activity); } } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :