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/*

 * Copyright 2007, 2008, 2009, 2010 Electronic Business Systems Ltd.

 *

 * This file is part of GSS.

 *

 * GSS is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * GSS 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 GSS.  If not, see <http://www.gnu.org/licenses/>.

 */

package gr.ebs.gss.server.domain;

import gr.ebs.gss.server.domain.dto.UserClassDTO;

import java.io.Serializable;

import java.text.DecimalFormat;

import java.util.List;

import javax.persistence.CascadeType;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;

import javax.persistence.OneToMany;

import javax.persistence.Version;

import org.hibernate.annotations.Cache;

import org.hibernate.annotations.CacheConcurrencyStrategy;

/**

 * A group of users with common attributes.

 *

 * @author droutsis

 */

@Entity

@Cache(usage=CacheConcurrencyStrategy.READ_WRITE)

public class UserClass  implements Serializable{

        /**

         * The persistence ID of the object.

         */

        @Id

        @GeneratedValue

        private Long id;

        /**

         * Version field for optimistic locking.

         */

        @SuppressWarnings("unused")

        @Version

        private int version;

        /**

         * A name for this class.

         */

        private String name;

        /**

         * The disk quota of this user class.

         */

        private long quota;

        /**

         * The users belonging to this class

         */

        @OneToMany(cascade = CascadeType.ALL, mappedBy = "userClass")

        private List<User> users;

        public Long getId() {

                return id;

        }

        public String getName() {

                return name;

        }

        public void setName(String aName) {

                name = aName;

        }

        public long getQuota() {

                return quota;

        }

        public void setQuota(long aQuota) {

                quota = aQuota;

        }

        @Override

        public String toString() {

                return name;

        }

        /**

         * Return a new Data Transfer Object for this user class.

         *

         * @return a new DTO with the same contents as this object

         */

        public UserClassDTO getDTO() {

                UserClassDTO u = new UserClassDTO();

                u.setId(id);

                u.setName(name);

                u.setQuota(quota);

                for (final User user : users)

                        u.getUsers().add(user.getDTO());

                return u;

        }

        /**

         * Return the quota size in a humanly readable form.

         */

        public String getQuotaAsString() {

                if (quota < 1024)

                        return String.valueOf(quota) + " B";

                else if (quota < 1024*1024)

                        return getSize(quota, 1024D) + " KB";

                else if (quota < 1024*1024*1024)

                        return getSize(quota,(1024D*1024D)) + " MB";

                return getSize(quota , (1024D*1024D*1024D)) + " GB";

        }

        private String getSize(Long size, Double divisor){

                DecimalFormat formatter = new DecimalFormat("######");

                return formatter.format((Double) (size.doubleValue()/divisor));

        }

}