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• CollectionUtil.java

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org.dbpedia.extraction.live.util.CollectionUtil Maven / Gradle / Ivy

package org.dbpedia.extraction.live.util;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

import org.dbpedia.extraction.live.util.collections.SetDiff;





public class CollectionUtil
{
	public static  Set set(T ... items)
	{
		return new HashSet(Arrays.asList(items));		
	}

	public static  ArrayList newList(T ... items)
	{
		return new ArrayList(Arrays.asList(items));
	}
	
	/**
	 * Returns the size of the specified collection or 0 on null.
	 * @param 
	 * @param collection
	 * @return
	 */
	public static  int size(Collection collection)
	{
		return collection == null ? 0 : collection.size();
	}
	
	public static  SetDiff diff(Collection old, Collection n)
	{
		// All new triples which were not present in old
		Set added = new HashSet(n);
		added.removeAll(old);
		
		// All old triples which are not present in new
		Set removed = new HashSet(old);
		removed.removeAll(n);
		
		// Triples which are common in both
		Set retained = new HashSet(old);
		retained.retainAll(n);
		
		return new SetDiff(added, removed, retained);
	}
}