com.smartitengineering.event.hub.api.impl.EventImpl.java Source code

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Here is the source code for com.smartitengineering.event.hub.api.impl.EventImpl.java

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/*
It is a application for event distribution to event n-consumers with m-sources.
Copyright (C) 2010 "Imran M Yousuf <imran@smartitengineering.com>"
    
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or any later
version.
    
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 General Public License for more details.
    
You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.smartitengineering.event.hub.api.impl;

import com.smartitengineering.event.hub.api.Content;
import com.smartitengineering.event.hub.api.Event;
import java.util.Date;
import java.util.UUID;
import org.apache.commons.lang.StringUtils;

/**
 *
 * @author imyousuf
 */
class EventImpl implements Event, Cloneable {

    private Content eventContent;
    private String placeholderId;
    private String universallyUniqueID;
    private Date creationDate;

    public void setEventContent(Content eventContent) {
        this.eventContent = eventContent;
    }

    public void setPlaceholderId(String placeholderId) {
        this.placeholderId = placeholderId;
    }

    public void setCreationDate(Date creationDate) {
        if (creationDate == null) {
            this.creationDate = null;
        } else {
            this.creationDate = new Date(creationDate.getTime());
        }
    }

    /**
     * Sets the universal unique ID if and only if its blank
     * @param universallyUniqueID The UUID to be set
     */
    public void setUniversallyUniqueID(String universallyUniqueID) {
        if (StringUtils.isNotBlank(universallyUniqueID)) {
            this.universallyUniqueID = universallyUniqueID;
        }
    }

    public String getPlaceholderId() {
        return placeholderId;
    }

    public String getUniversallyUniqueID() {
        if (StringUtils.isBlank(universallyUniqueID)) {
            initUUID();
        }
        return universallyUniqueID;
    }

    public Content getEventContent() {
        return eventContent;
    }

    public Date getCreationDate() {
        if (creationDate == null) {
            return null;
        }
        return new Date(creationDate.getTime());
    }

    protected synchronized void initUUID() {
        //Extra check for successive access to initUUID of an instance
        if (StringUtils.isBlank(universallyUniqueID)) {
            universallyUniqueID = UUID.randomUUID().toString();
        }
    }

    @Override
    public EventImpl clone() {
        EventImpl clone = new EventImpl();
        clone.setEventContent(eventContent);
        if (StringUtils.isNotBlank(universallyUniqueID)) {
            clone.setUniversallyUniqueID(getUniversallyUniqueID());
        }
        clone.setPlaceholderId(placeholderId);
        clone.setCreationDate(creationDate);
        return clone;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (!Event.class.isAssignableFrom(obj.getClass())) {
            return false;
        }
        final Event other = (Event) obj;
        final String otherUniversallyUniqueID = other.getUniversallyUniqueID();
        if (otherUniversallyUniqueID == null || !this.getUniversallyUniqueID().equals(otherUniversallyUniqueID)) {
            return false;
        }
        return true;
    }

    @Override
    public int hashCode() {
        int hash = 3;
        hash = 23 * hash + this.getUniversallyUniqueID().hashCode();
        return hash;
    }

    @Override
    public String toString() {
        return getPlaceholderId();
    }
}