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// Copyright (c) 2003-2012, Jodd Team (jodd.org). All Rights Reserved.

package jodd.cache;

import java.util.Iterator;

/**
 * Values iterator for {@link jodd.cache.AbstractCacheMap}.
 */
public class CacheValuesIterator implements Iterator {

	private Iterator.CacheObject> iterator;

	private AbstractCacheMap.CacheObject nextValue;

	CacheValuesIterator(AbstractCacheMap abstractCacheMap) {
		iterator = abstractCacheMap.cacheMap.values().iterator();
		nextValue();
	}

	/**
	 * Resolves next value. If next value doesn't exist, next value will be null.
	 */
	private void nextValue() {
		while (iterator.hasNext()) {
			nextValue = iterator.next();
			if (nextValue.isExpired() == false) {
				return;
			}
		}
		nextValue = null;
	}

	/**
	 * Returns true if there are more elements in the cache.
	 */
	public boolean hasNext() {
		return nextValue != null;
	}

	/**
	 * Returns next non-expired element from the cache.
	 */
	public V next() {
		V cachedObject = nextValue.cachedObject;
		nextValue();
		return cachedObject;
	}

	/**
	 * Removes current non-expired element from the cache.
	 */
	public void remove() {
		iterator.remove();
	}
}