com.hs.mail.imap.event.EventTracker.java Source code

Introduction

Here is the source code for com.hs.mail.imap.event.EventTracker.java

Source

/*
 * Copyright 2010 the original author or authors.
 * 
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.hs.mail.imap.event;

import java.util.Collection;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;

import org.apache.commons.collections.CollectionUtils;

import com.hs.mail.imap.dao.DaoFactory;

/**
 * 
 * @author Won Chul Doh
 * @since Jul 30, 2010
 *
 */
public class EventTracker implements EventListener {

    private boolean deletedMailbox = false;
    private boolean sizeChanged = false;
    private Set<Long> expungedUids;
    private Set<Long> flagUpdatedUids;
    private List<Long> cachedUids;

    public boolean isDeletedMailbox() {
        return deletedMailbox;
    }

    public boolean isSizeChanged() {
        return sizeChanged;
    }

    public boolean hasExpungedUids() {
        return CollectionUtils.isNotEmpty(expungedUids);
    }

    public Set<Long> getExpungedUids() {
        return expungedUids;
    }

    public boolean hasUpdatedFlags() {
        return CollectionUtils.isNotEmpty(flagUpdatedUids);
    }

    public Set<Long> getFlagUpdatedUids() {
        return flagUpdatedUids;
    }

    public List<Long> getCachedUids() {
        return cachedUids;
    }

    public void event(Event event) {
        if (event instanceof MessageAddedEvent) {
            reset();
            sizeChanged = true;
        } else if (event instanceof MessageExpungedEvent) {
            expunged((MessageExpungedEvent) event);
        } else if (event instanceof FlagUpdatedEvent) {
            flagsUpdated((FlagUpdatedEvent) event);
        } else if (event instanceof MailboxDeletedEvent) {
            deletedMailbox = true;
        }
    }

    private void expunged(MessageExpungedEvent event) {
        List<Long> uids = event.getExpungedUids();
        if (expungedUids == null) {
            expungedUids = new TreeSet<Long>(uids);
            cachedUids = DaoFactory.getMessageDao().getMessageIDList(event.getMailboxID());
        } else {
            expungedUids.addAll(uids);
        }
    }

    private void flagsUpdated(FlagUpdatedEvent event) {
        List<Long> uids = event.getFlagUpdatedUids();
        if (flagUpdatedUids == null) {
            flagUpdatedUids = new TreeSet<Long>(uids);
        } else {
            flagUpdatedUids.addAll(uids);
        }
    }

    private void clear(Collection<Long> uids) {
        if (uids != null) {
            uids.clear();
        }
    }

    public void reset() {
        sizeChanged = false;
        clear(expungedUids);
        clear(flagUpdatedUids);
        clear(cachedUids);
        expungedUids = null;
    }

}