wot/src/main/java/net/pterodactylus/freenet/wot/IdentityChangeEventSender.java

   1 /*
   2  * Sone - IdentityChangeEventSender.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.freenet.wot;
  19
  20 import java.util.Collection;
  21 import java.util.Map;
  22
  23 import net.pterodactylus.freenet.wot.IdentityChangeDetector.IdentityProcessor;
  24 import net.pterodactylus.freenet.wot.event.IdentityAddedEvent;
  25 import net.pterodactylus.freenet.wot.event.IdentityRemovedEvent;
  26 import net.pterodactylus.freenet.wot.event.IdentityUpdatedEvent;
  27 import net.pterodactylus.freenet.wot.event.OwnIdentityAddedEvent;
  28 import net.pterodactylus.freenet.wot.event.OwnIdentityRemovedEvent;
  29
  30 import com.google.common.eventbus.EventBus;
  31
  32 /**
  33  * Detects changes in {@link Identity}s trusted my multiple {@link OwnIdentity}s.
  34  *
  35  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  36  * @see IdentityChangeDetector
  37  */
  38 public class IdentityChangeEventSender {
  39
  40         private final EventBus eventBus;
  41         private final Map<OwnIdentity, Collection<Identity>> oldIdentities;
  42
  43         public IdentityChangeEventSender(EventBus eventBus, Map<OwnIdentity, Collection<Identity>> oldIdentities) {
  44                 this.eventBus = eventBus;
  45                 this.oldIdentities = oldIdentities;
  46         }
  47
  48         public void detectChanges(Map<OwnIdentity, Collection<Identity>> identities) {
  49                 IdentityChangeDetector identityChangeDetector = new IdentityChangeDetector(oldIdentities.keySet());
  50                 identityChangeDetector.onNewIdentity(addNewOwnIdentityAndItsTrustedIdentities(identities));
  51                 identityChangeDetector.onRemovedIdentity(removeOwnIdentityAndItsTrustedIdentities(oldIdentities));
  52                 identityChangeDetector.onUnchangedIdentity(detectChangesInTrustedIdentities(identities, oldIdentities));
  53                 identityChangeDetector.detectChanges(identities.keySet());
  54         }
  55
  56         private IdentityProcessor addNewOwnIdentityAndItsTrustedIdentities(Map<OwnIdentity, Collection<Identity>> newIdentities) {
  57                 return identity -> {
  58                         eventBus.post(new OwnIdentityAddedEvent((OwnIdentity) identity));
  59                         for (Identity newIdentity : newIdentities.get(identity)) {
  60                                 eventBus.post(new IdentityAddedEvent((OwnIdentity) identity, newIdentity));
  61                         }
  62                 };
  63         }
  64
  65         private IdentityProcessor removeOwnIdentityAndItsTrustedIdentities(Map<OwnIdentity, Collection<Identity>> oldIdentities) {
  66                 return identity -> {
  67                         eventBus.post(new OwnIdentityRemovedEvent((OwnIdentity) identity));
  68                         for (Identity removedIdentity : oldIdentities.get(identity)) {
  69                                 eventBus.post(new IdentityRemovedEvent((OwnIdentity) identity, removedIdentity));
  70                         }
  71                 };
  72         }
  73
  74         private IdentityProcessor detectChangesInTrustedIdentities(Map<OwnIdentity, Collection<Identity>> newIdentities, Map<OwnIdentity, Collection<Identity>> oldIdentities) {
  75                 return new DefaultIdentityProcessor(oldIdentities, newIdentities);
  76         }
  77
  78         private class DefaultIdentityProcessor implements IdentityProcessor {
  79
  80                 private final Map<OwnIdentity, Collection<Identity>> oldIdentities;
  81                 private final Map<OwnIdentity, Collection<Identity>> newIdentities;
  82
  83                 public DefaultIdentityProcessor(Map<OwnIdentity, Collection<Identity>> oldIdentities, Map<OwnIdentity, Collection<Identity>> newIdentities) {
  84                         this.oldIdentities = oldIdentities;
  85                         this.newIdentities = newIdentities;
  86                 }
  87
  88                 @Override
  89                 public void processIdentity(Identity ownIdentity) {
  90                         IdentityChangeDetector identityChangeDetector = new IdentityChangeDetector(oldIdentities.get(ownIdentity));
  91                         identityChangeDetector.onNewIdentity(notifyForAddedIdentities((OwnIdentity) ownIdentity));
  92                         identityChangeDetector.onRemovedIdentity(notifyForRemovedIdentities((OwnIdentity) ownIdentity));
  93                         identityChangeDetector.onChangedIdentity(notifyForChangedIdentities((OwnIdentity) ownIdentity));
  94                         identityChangeDetector.detectChanges(newIdentities.get(ownIdentity));
  95                 }
  96
  97                 private IdentityProcessor notifyForChangedIdentities(OwnIdentity ownIdentity) {
  98                         return identity -> eventBus.post(new IdentityUpdatedEvent(ownIdentity, identity));
  99                 }
 100
 101                 private IdentityProcessor notifyForRemovedIdentities(OwnIdentity ownIdentity) {
 102                         return identity -> eventBus.post(new IdentityRemovedEvent(ownIdentity, identity));
 103                 }
 104
 105                 private IdentityProcessor notifyForAddedIdentities(OwnIdentity ownIdentity) {
 106                         return identity -> eventBus.post(new IdentityAddedEvent(ownIdentity, identity));
 107                 }
 108
 109         }
 110
 111 }