org.obm.push.calendar.ConsistencyEventChangesLogger.java Source code

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Here is the source code for org.obm.push.calendar.ConsistencyEventChangesLogger.java

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/* ***** BEGIN LICENSE BLOCK *****
 * 
 * Copyright (C) 2011-2014  Linagora
 *
 * This program is free software: you can redistribute it and/or 
 * modify it under the terms of the GNU Affero General Public License as 
 * published by the Free Software Foundation, either version 3 of the 
 * License, or (at your option) any later version, provided you comply 
 * with the Additional Terms applicable for OBM connector by Linagora 
 * pursuant to Section 7 of the GNU Affero General Public License, 
 * subsections (b), (c), and (e), pursuant to which you must notably (i) retain 
 * the Message sent thanks to OBM, Free Communication by Linagora? 
 * signature notice appended to any and all outbound messages 
 * (notably e-mail and meeting requests), (ii) retain all hypertext links between 
 * OBM and obm.org, as well as between Linagora and linagora.com, and (iii) refrain 
 * from infringing Linagora intellectual property rights over its trademarks 
 * and commercial brands. Other Additional Terms apply, 
 * see <http://www.linagora.com/licenses/> for more details. 
 *
 * This program is distributed in the hope that it will be useful, 
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License 
 * for more details. 
 *
 * You should have received a copy of the GNU Affero General Public License 
 * and its applicable Additional Terms for OBM along with this program. If not, 
 * see <http://www.gnu.org/licenses/> for the GNU Affero General Public License version 3 
 * and <http://www.linagora.com/licenses/> for the Additional Terms applicable to 
 * OBM connectors. 
 * 
 * ***** END LICENSE BLOCK ***** */
package org.obm.push.calendar;

import java.util.Collection;
import java.util.Map;
import java.util.Map.Entry;

import org.obm.sync.calendar.DeletedEvent;
import org.obm.sync.calendar.Event;
import org.obm.sync.calendar.EventObmId;
import org.obm.sync.items.EventChanges;
import org.slf4j.Logger;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.collect.ImmutableListMultimap;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ListMultimap;
import com.google.common.collect.Maps;
import com.google.common.collect.Multimaps;
import com.google.inject.Inject;
import com.google.inject.Singleton;

@Singleton
public class ConsistencyEventChangesLogger {

    public static class NotConsistentEventChanges {

        private final Map<EventObmId, Collection<Object>> duplicatesEntries;

        public NotConsistentEventChanges(Map<EventObmId, Collection<Object>> duplicatesEntries) {
            this.duplicatesEntries = ImmutableMap.copyOf(duplicatesEntries);
        }

        public Map<EventObmId, Collection<Object>> getDuplicatesEntries() {
            return duplicatesEntries;
        }

        public boolean hasConsistencyProblem() {
            return !duplicatesEntries.isEmpty();
        }

        public String representation() {
            StringBuilder representation = new StringBuilder();
            for (Entry<EventObmId, Collection<Object>> entry : duplicatesEntries.entrySet()) {
                representation.append("Id ").append(entry.getKey().serializeToString())
                        .append(" has duplicates entries : ").append(entry.getValue().toString()).append("\n");
            }
            return representation.toString();
        }
    }

    @Inject
    @VisibleForTesting
    ConsistencyEventChangesLogger() {
        super();
    }

    public void log(Logger logger, EventChanges changes) {
        log(logger, build(changes));
    }

    @VisibleForTesting
    void log(Logger logger, NotConsistentEventChanges notConsistentEventChanges) {
        if (notConsistentEventChanges.hasConsistencyProblem()) {
            logger.error("There is some consistency problems on the given event changes.");
            logger.error(notConsistentEventChanges.representation());
        }
    }

    @VisibleForTesting
    NotConsistentEventChanges build(EventChanges changes) {
        Map<EventObmId, Collection<Object>> allEntries = buildAllEntriesMultimap(changes);
        Map<EventObmId, Collection<Object>> duplicatesEntries = Maps.filterEntries(allEntries,
                alLeastTwoElements());
        return new NotConsistentEventChanges(duplicatesEntries);
    }

    private Predicate<Entry<EventObmId, Collection<Object>>> alLeastTwoElements() {
        return new Predicate<Entry<EventObmId, Collection<Object>>>() {
            @Override
            public boolean apply(Entry<EventObmId, Collection<Object>> input) {
                return input.getValue().size() > 1;
            }
        };
    }

    private Map<EventObmId, Collection<Object>> buildAllEntriesMultimap(EventChanges changes) {
        return ImmutableListMultimap.<EventObmId, Object>builder().putAll(buildDeletionsMultimap(changes))
                .putAll(buildUpdatesMultimap(changes)).build().asMap();
    }

    private ImmutableListMultimap<EventObmId, Event> buildUpdatesMultimap(EventChanges changes) {
        return Multimaps.index(changes.getUpdated(), new Function<Event, EventObmId>() {
            @Override
            public EventObmId apply(Event input) {
                return input.getObmId();
            }
        });
    }

    private ListMultimap<EventObmId, DeletedEvent> buildDeletionsMultimap(EventChanges changes) {
        return Multimaps.index(changes.getDeletedEvents(), new Function<DeletedEvent, EventObmId>() {
            @Override
            public EventObmId apply(DeletedEvent input) {
                return input.getId();
            }
        });
    }
}