[Tail-cvs] Tail/src/java/net/sf/tail/indicator/cache CachedIndicator.java, 1.1

[Márcio V. d. S. <mv...@us...>]

Update of /cvsroot/tail/Tail/src/java/net/sf/tail/indicator/cache
In directory sc8-pr-cvs10.sourceforge.net:/tmp/cvs-serv21729/src/java/net/sf/tail/indicator/cache

Added Files:
	CachedIndicator.java 
Log Message:
refatoração de código (control + shift + f)

--- NEW FILE: CachedIndicator.java ---
package net.sf.tail.indicator.cache;

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

import net.sf.tail.Indicator;

public class CachedIndicator implements Indicator {

	private final Indicator<? extends Number> indicator;

	// TODO - A melhor solução é realmente List<Number> ?
	private List<Number> results;

	public CachedIndicator(Indicator<? extends Number> indicator) {
		this.indicator = indicator;
		results = new ArrayList<Number>();
	}

	public Number getValue(int index) {
		increaseLength(index);

		if (results.get(index) == null) {
			results.set(index, indicator.getValue(index));
		}
		return results.get(index);
	}

	private void increaseLength(int index) {
		if (results.size() <= index) {
			results.addAll(Collections.<Number> nCopies(index - results.size() + 1, null));
		}
	}

}