org.etlunit.feature.FeatureProxyBase Maven / Gradle / Ivy

Go to download
package org.etlunit.feature;

import java.util.ArrayList;
import java.util.List;

public class FeatureProxyBase
{
	interface Getter
	{
		K get(Feature f);
	}

	private final Getter getter;
	private final List list;

	private final List klist = new ArrayList();

	private int lastSize = -1;

	public FeatureProxyBase(List list, Getter getter)
	{
		this.list = list;
		this.getter = getter;
	}

	public List getList()
	{
		if (list.size() == lastSize)
		{
			return klist;
		}

		klist.clear();

		for (Feature feature : list)
		{
			K k = getter.get(feature);

			if (k != null)
			{
				klist.add(k);
			}
		}

		lastSize = list.size();

		return klist;
	}
}