SN.java

/*
 * Copyright (c) 2013 LDBC
 * Linked Data Benchmark Council (http://ldbc.eu)
 *
 * This file is part of ldbc_socialnet_dbgen.
 *
 * ldbc_socialnet_dbgen 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.
 * 
 * ldbc_socialnet_dbgen 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 ldbc_socialnet_dbgen.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Copyright (C) 2011 OpenLink Software <bdsmt@openlinksw.com>
 * All Rights Reserved.
 *
 * This program 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;  only Version 2 of the License dated
 * June 1991.
 *
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package ldbc.snb.datagen.vocabulary;

import ldbc.snb.datagen.dictionary.Dictionaries;
import ldbc.snb.datagen.generator.DatagenParams;

/**
 * LDBC social network data namespace used in the serialization process.
 */
public class SN {

    public static long machineId;
    private static long numBits;
    public static final String NAMESPACE = "http://www.ldbc.eu/ldbc_socialnet/1.0/data/";
    public static final String PREFIX = "sn:";
    public static final String BLANK_NODE = "_:";
    private static long minDate;
    private static long maxDate;

    /**
     * Sets the machine id.
     * Used as a suffix in some SN entities' tp create unique IDs in parallel generation.
     */

    public static void initialize() {
        minDate = Dictionaries.dates.getStartDateTime();
        maxDate = Dictionaries.dates.getEndDateTime();
        numBits = (int) Math.ceil(Math.log10(Math.ceil(DatagenParams.numPersons/(double)DatagenParams.blockSize)) / Math.log10(2));
        if (numBits > 20) System.out.print("WARNING: Possible id overlapp");
    }

    /**
     * Gets the LDBC social network data prefix version of the input.
     */
    public static String prefixed(String string) {
        return PREFIX + string;
    }

    /**
     * Gets the LDBC social network data URL version of the input.
     */
    public static String getUrl(String string) {
        return NAMESPACE + string;
    }

    /**
     * Gets the LDBC social network data RDF-URL version of the input.
     */
    public static String fullprefixed(String string) {
        return "<" + NAMESPACE + string + ">";
    }

    /**
     * Gets the person entity prefix.
     */
    public static String getPersonURI(long id) {
        return PREFIX + "pers" + String.format("%020d", id);
    }

    /**
     * Gets the forum entity prefix.
     */
    public static String getForumURI(long id) {
        return PREFIX + "forum" + String.format("%020d", id);
    }

    /**
     * Gets the post entity prefix.
     */
    public static String getPostURI(long id) {
        return PREFIX + "post" + String.format("%020d", id);
    }

    /**
     * Gets the comment entity prefix.
     */
    public static String getCommentURI(long id) {
        return PREFIX + "comm" + String.format("%020d", id);
    }

    /**
     * Gets the membership relation prefix.
     */
    public static String getMembershipURI(long id) {
        return BLANK_NODE + "mbs" + String.format("%020d", id);
    }

    /**
     * Gets the like relation prefix.
     */
    public static String getLikeURI(long id) {
        return BLANK_NODE + "like" + String.format("%020d", id);
    }

    /**
     * Gets the studyAt relation prefix.
     */
    public static String getStudyAtURI(long id) {
        return BLANK_NODE + "study" + String.format("%020d", id);
    }

    /**
     * Gets the workAt relation prefix.
     */
    public static String getWorkAtURI(long id) {
        return BLANK_NODE + "work" + String.format("%020d", id );
    }

    public static String getUnivURI(long id) {
	return PREFIX + "uni" + String.format("%06d", id);
    }

    public static String getCompURI(long id) {
	return PREFIX + "com" + String.format("%06d", id);
    }

    public static String getKnowsURI(long id) {
        return BLANK_NODE + "knows" + String.format("%020d", id);
    }

    public static String getTagClassURI(long id) {
        return BLANK_NODE + "tagclass" + String.format("%06d", id);
    }

    public static Long formId(long id) {
        long lowMask = 0x0FFFFF;                                // This mask is used to get the lowest 20 bits.
        long lowerPart = (lowMask & id);
        long machinePart = machineId << 20;
        long upperPart = (id >> 20) << (20 + numBits);
        return upperPart | machinePart | lowerPart;
    }

    public static long composeId(long id, long date) {
        long bucket = (long) (256 * (date - minDate) / (double) maxDate);
        long idMask = ~(0xFFFFFFFFFFFFFFFFL << 36);
        return (bucket << 36) | (id & idMask);
    }
}