gov.nasa.pds.harvest.util.LidVidUtils Maven / Gradle / Ivy

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package gov.nasa.pds.harvest.util;

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


/**
 * Helper methods to work with product IDs (LIDs and LIDVIDs).
 * 
 * @author karpenko
 */
public class LidVidUtils
{
    /**
     * Convert lidvids to lids. Discard vid (version) information.
     * @param lidvids Collection of LidVids
     * @return Collection of Lids
     */
    public static Set lidvidToLid(Collection lidvids)
    {
        if(isEmpty(lidvids)) return null;
        
        Set lids = new TreeSet<>();
        
        for(String lidvid: lidvids)
        {
            String lid = lidvidToLid(lidvid);
            lids.add(lid);
        }
        
        return lids;
    }
    
    
    /**
     * Convert lidvid to lid. Discard vid (version) information.
     * @param lidvid LidVid
     * @return Lid
     */
    public static String lidvidToLid(String lidvid)
    {
        int idx = lidvid.indexOf("::");
        return lidvid.substring(0, idx);
    }

    
    /**
     * Add all values from a collection to the set. 
     * @param set Target set
     * @param col A collection
     * @return Target set
     */
    public static Set add(Set set, Collection col)
    {
        if(isEmpty(col)) return set;
        
        if(set == null) set = new TreeSet<>();
        set.addAll(col);
        
        return set;
    }
    
    
    private static boolean isEmpty(Collection col)
    {
        return col == null || col.isEmpty();
    }
}