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

   1 /*
   2  * Sone - IdentityChangeEventSender.java - Copyright © 2013–2015 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 java.util.Collection;
  21 import java.util.Map;
  22
  23 import net.pterodactylus.sone.freenet.wot.IdentityChangeDetector.IdentityProcessor;
  24 import net.pterodactylus.sone.freenet.wot.event.IdentityAddedEvent;
  25 import net.pterodactylus.sone.freenet.wot.event.IdentityRemovedEvent;
  26 import net.pterodactylus.sone.freenet.wot.event.IdentityUpdatedEvent;
  27 import net.pterodactylus.sone.freenet.wot.event.OwnIdentityAddedEvent;
  28 import net.pterodactylus.sone.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
  34  * OwnIdentity}s.
  35  *
  36  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  37  * @see IdentityChangeDetector
  38  */
  39 public class IdentityChangeEventSender {
  40
  41         private final EventBus eventBus;
  42         private final Map<OwnIdentity, Collection<Identity>> oldIdentities;
  43
  44         public IdentityChangeEventSender(EventBus eventBus, Map<OwnIdentity, Collection<Identity>> oldIdentities) {
  45                 this.eventBus = eventBus;
  46                 this.oldIdentities = oldIdentities;
  47         }
  48
  49         public void detectChanges(Map<OwnIdentity, Collection<Identity>> identities) {
  50                 IdentityChangeDetector identityChangeDetector = new IdentityChangeDetector(oldIdentities.keySet());
  51                 identityChangeDetector.onNewIdentity(addNewOwnIdentityAndItsTrustedIdentities(identities));
  52                 identityChangeDetector.onRemovedIdentity(removeOwnIdentityAndItsTrustedIdentities(oldIdentities));
  53                 identityChangeDetector.onUnchangedIdentity(detectChangesInTrustedIdentities(identities, oldIdentities));
  54                 identityChangeDetector.detectChanges(identities.keySet());
  55         }
  56
  57         private IdentityProcessor addNewOwnIdentityAndItsTrustedIdentities(final Map<OwnIdentity, Collection<Identity>> newIdentities) {
  58                 return new IdentityProcessor() {
  59                         @Override
  60                         public void processIdentity(Identity identity) {
  61                                 eventBus.post(new OwnIdentityAddedEvent((OwnIdentity) identity));
  62                                 for (Identity newIdentity : newIdentities.get((OwnIdentity) identity)) {
  63                                         eventBus.post(new IdentityAddedEvent((OwnIdentity) identity, newIdentity));
  64                                 }
  65                         }
  66                 };
  67         }
  68
  69         private IdentityProcessor removeOwnIdentityAndItsTrustedIdentities(final Map<OwnIdentity, Collection<Identity>> oldIdentities) {
  70                 return new IdentityProcessor() {
  71                         @Override
  72                         public void processIdentity(Identity identity) {
  73                                 eventBus.post(new OwnIdentityRemovedEvent((OwnIdentity) identity));
  74                                 for (Identity removedIdentity : oldIdentities.get((OwnIdentity) identity)) {
  75                                         eventBus.post(new IdentityRemovedEvent((OwnIdentity) identity, removedIdentity));
  76                                 }
  77                         }
  78                 };
  79         }
  80
  81         private IdentityProcessor detectChangesInTrustedIdentities(Map<OwnIdentity, Collection<Identity>> newIdentities, Map<OwnIdentity, Collection<Identity>> oldIdentities) {
  82                 return new DefaultIdentityProcessor(oldIdentities, newIdentities);
  83         }
  84
  85         private class DefaultIdentityProcessor implements IdentityProcessor {
  86
  87                 private final Map<OwnIdentity, Collection<Identity>> oldIdentities;
  88                 private final Map<OwnIdentity, Collection<Identity>> newIdentities;
  89
  90                 public DefaultIdentityProcessor(Map<OwnIdentity, Collection<Identity>> oldIdentities, Map<OwnIdentity, Collection<Identity>> newIdentities) {
  91                         this.oldIdentities = oldIdentities;
  92                         this.newIdentities = newIdentities;
  93                 }
  94
  95                 @Override
  96                 public void processIdentity(Identity ownIdentity) {
  97                         IdentityChangeDetector identityChangeDetector = new IdentityChangeDetector(oldIdentities.get((OwnIdentity) ownIdentity));
  98                         identityChangeDetector.onNewIdentity(notifyForAddedIdentities((OwnIdentity) ownIdentity));
  99                         identityChangeDetector.onRemovedIdentity(notifyForRemovedIdentities((OwnIdentity) ownIdentity));
 100                         identityChangeDetector.onChangedIdentity(notifyForChangedIdentities((OwnIdentity) ownIdentity));
 101                         identityChangeDetector.detectChanges(newIdentities.get((OwnIdentity) ownIdentity));
 102                 }
 103
 104                 private IdentityProcessor notifyForChangedIdentities(final OwnIdentity ownIdentity) {
 105                         return new IdentityProcessor() {
 106                                 @Override
 107                                 public void processIdentity(Identity identity) {
 108                                         eventBus.post(new IdentityUpdatedEvent(ownIdentity, identity));
 109                                 }
 110                         };
 111                 }
 112
 113                 private IdentityProcessor notifyForRemovedIdentities(final OwnIdentity ownIdentity) {
 114                         return new IdentityProcessor() {
 115                                 @Override
 116                                 public void processIdentity(Identity identity) {
 117                                         eventBus.post(new IdentityRemovedEvent(ownIdentity, identity));
 118                                 }
 119                         };
 120                 }
 121
 122                 private IdentityProcessor notifyForAddedIdentities(final OwnIdentity ownIdentity) {
 123                         return new IdentityProcessor() {
 124                                 @Override
 125                                 public void processIdentity(Identity identity) {
 126                                         eventBus.post(new IdentityAddedEvent(ownIdentity, identity));
 127                                 }
 128                         };
 129                 }
 130
 131         }
 132
 133 }