src/main/java/net/pterodactylus/sone/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.sone.freenet.wot;
  19
  20 import net.pterodactylus.sone.freenet.wot.IdentityChangeDetector.IdentityProcessor;
  21 import net.pterodactylus.sone.freenet.wot.event.IdentityAddedEvent;
  22 import net.pterodactylus.sone.freenet.wot.event.IdentityRemovedEvent;
  23 import net.pterodactylus.sone.freenet.wot.event.IdentityUpdatedEvent;
  24 import net.pterodactylus.sone.freenet.wot.event.OwnIdentityAddedEvent;
  25 import net.pterodactylus.sone.freenet.wot.event.OwnIdentityRemovedEvent;
  26
  27 import com.google.common.collect.Multimap;
  28 import com.google.common.eventbus.EventBus;
  29
  30 /**
  31  * Detects changes in {@link Identity}s trusted my multiple {@link
  32  * OwnIdentity}s.
  33  *
  34  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  35  * @see IdentityChangeDetector
  36  */
  37 public class IdentityChangeEventSender {
  38
  39         private final EventBus eventBus;
  40         private final Multimap<OwnIdentity, Identity> oldIdentities;
  41
  42         public IdentityChangeEventSender(EventBus eventBus, Multimap<OwnIdentity, Identity> oldIdentities) {
  43                 this.eventBus = eventBus;
  44                 this.oldIdentities = oldIdentities;
  45         }
  46
  47         public void detectChanges(Multimap<OwnIdentity, Identity> identities) {
  48                 IdentityChangeDetector identityChangeDetector = new IdentityChangeDetector(oldIdentities.keySet());
  49                 identityChangeDetector.onNewIdentity(addNewOwnIdentityAndItsTrustedIdentities(identities));
  50                 identityChangeDetector.onRemovedIdentity(removeOwnIdentityAndItsTrustedIdentities(oldIdentities));
  51                 identityChangeDetector.onUnchangedIdentity(detectChangesInTrustedIdentities(identities, oldIdentities));
  52                 identityChangeDetector.detectChanges(identities.keySet());
  53         }
  54
  55         private IdentityProcessor addNewOwnIdentityAndItsTrustedIdentities(final Multimap<OwnIdentity, Identity> newIdentities) {
  56                 return new IdentityProcessor() {
  57                         @Override
  58                         public void processIdentity(Identity identity) {
  59                                 eventBus.post(new OwnIdentityAddedEvent((OwnIdentity) identity));
  60                                 for (Identity newIdentity : newIdentities.get((OwnIdentity) identity)) {
  61                                         eventBus.post(new IdentityAddedEvent((OwnIdentity) identity, newIdentity));
  62                                 }
  63                         }
  64                 };
  65         }
  66
  67         private IdentityProcessor removeOwnIdentityAndItsTrustedIdentities(final Multimap<OwnIdentity, Identity> oldIdentities) {
  68                 return new IdentityProcessor() {
  69                         @Override
  70                         public void processIdentity(Identity identity) {
  71                                 eventBus.post(new OwnIdentityRemovedEvent((OwnIdentity) identity));
  72                                 for (Identity removedIdentity : oldIdentities.get((OwnIdentity) identity)) {
  73                                         eventBus.post(new IdentityRemovedEvent((OwnIdentity) identity, removedIdentity));
  74                                 }
  75                         }
  76                 };
  77         }
  78
  79         private IdentityProcessor detectChangesInTrustedIdentities(Multimap<OwnIdentity, Identity> newIdentities, Multimap<OwnIdentity, Identity> oldIdentities) {
  80                 return new DefaultIdentityProcessor(oldIdentities, newIdentities);
  81         }
  82
  83         private class DefaultIdentityProcessor implements IdentityProcessor {
  84
  85                 private final Multimap<OwnIdentity, Identity> oldIdentities;
  86                 private final Multimap<OwnIdentity, Identity> newIdentities;
  87
  88                 public DefaultIdentityProcessor(Multimap<OwnIdentity, Identity> oldIdentities, Multimap<OwnIdentity, Identity> newIdentities) {
  89                         this.oldIdentities = oldIdentities;
  90                         this.newIdentities = newIdentities;
  91                 }
  92
  93                 @Override
  94                 public void processIdentity(Identity ownIdentity) {
  95                         IdentityChangeDetector identityChangeDetector = new IdentityChangeDetector(oldIdentities.get((OwnIdentity) ownIdentity));
  96                         identityChangeDetector.onNewIdentity(notifyForAddedIdentities((OwnIdentity) ownIdentity));
  97                         identityChangeDetector.onRemovedIdentity(notifyForRemovedIdentities((OwnIdentity) ownIdentity));
  98                         identityChangeDetector.onChangedIdentity(notifyForChangedIdentities((OwnIdentity) ownIdentity));
  99                         identityChangeDetector.detectChanges(newIdentities.get((OwnIdentity) ownIdentity));
 100                 }
 101
 102                 private IdentityProcessor notifyForChangedIdentities(final OwnIdentity ownIdentity) {
 103                         return new IdentityProcessor() {
 104                                 @Override
 105                                 public void processIdentity(Identity identity) {
 106                                         eventBus.post(new IdentityUpdatedEvent(ownIdentity, identity));
 107                                 }
 108                         };
 109                 }
 110
 111                 private IdentityProcessor notifyForRemovedIdentities(final OwnIdentity ownIdentity) {
 112                         return new IdentityProcessor() {
 113                                 @Override
 114                                 public void processIdentity(Identity identity) {
 115                                         eventBus.post(new IdentityRemovedEvent(ownIdentity, identity));
 116                                 }
 117                         };
 118                 }
 119
 120                 private IdentityProcessor notifyForAddedIdentities(final OwnIdentity ownIdentity) {
 121                         return new IdentityProcessor() {
 122                                 @Override
 123                                 public void processIdentity(Identity identity) {
 124                                         eventBus.post(new IdentityAddedEvent(ownIdentity, identity));
 125                                 }
 126                         };
 127                 }
 128
 129         }
 130
 131 }