src/main/java/net/pterodactylus/sone/freenet/wot/IdentityLoader.java

   1 /*
   2  * Sone - IdentityLoader.java - Copyright © 2013 David Roden
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.pterodactylus.sone.freenet.wot;
  19
  20 import static com.google.common.collect.HashMultimap.create;
  21 import static net.pterodactylus.sone.freenet.wot.Context.extractContext;
  22
  23 import java.util.Collection;
  24 import java.util.Set;
  25
  26 import javax.annotation.Nullable;
  27
  28 import net.pterodactylus.sone.freenet.plugin.PluginException;
  29
  30 import com.google.common.base.Function;
  31 import com.google.common.base.Optional;
  32 import com.google.common.collect.Multimap;
  33 import com.google.inject.Inject;
  34
  35 /**
  36  * Loads {@link OwnIdentity}s and the {@link Identity}s they trust.
  37  *
  38  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  39  */
  40 public class IdentityLoader {
  41
  42         private final WebOfTrustConnector webOfTrustConnector;
  43         private final Optional<Context> context;
  44
  45         public IdentityLoader(WebOfTrustConnector webOfTrustConnector) {
  46                 this(webOfTrustConnector, Optional.<Context>absent());
  47         }
  48
  49         @Inject
  50         public IdentityLoader(WebOfTrustConnector webOfTrustConnector, Optional<Context> context) {
  51                 this.webOfTrustConnector = webOfTrustConnector;
  52                 this.context = context;
  53         }
  54
  55         public Multimap<OwnIdentity, Identity> loadIdentities() throws WebOfTrustException {
  56                 Collection<OwnIdentity> currentOwnIdentities = webOfTrustConnector.loadAllOwnIdentities();
  57                 return loadTrustedIdentitiesForOwnIdentities(currentOwnIdentities);
  58         }
  59
  60         private Multimap<OwnIdentity, Identity> loadTrustedIdentitiesForOwnIdentities(Collection<OwnIdentity> ownIdentities) throws PluginException {
  61                 Multimap<OwnIdentity, Identity> currentIdentities = create();
  62
  63                 for (OwnIdentity ownIdentity : ownIdentities) {
  64                         if (identityDoesNotHaveTheCorrectContext(ownIdentity)) {
  65                                 continue;
  66                         }
  67
  68                         Set<Identity> trustedIdentities = webOfTrustConnector.loadTrustedIdentities(ownIdentity, context.transform(extractContext));
  69                         currentIdentities.putAll(ownIdentity, trustedIdentities);
  70                 }
  71
  72                 return currentIdentities;
  73         }
  74
  75         private boolean identityDoesNotHaveTheCorrectContext(OwnIdentity ownIdentity) {
  76                 return context.isPresent() && !ownIdentity.hasContext(context.transform(extractContext).get());
  77         }
  78
  79 }