lazyiterator.java

hibernate-distribution-3.3.1.GA-dist.zip源码

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Middleware LLC.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 *
 */
package org.hibernate.util;

import java.util.Iterator;
import java.util.Map;

public final class LazyIterator implements Iterator {
	
	private final Map map;
	private Iterator iterator;
	
	private Iterator getIterator() {
		if (iterator==null) {
			iterator = map.values().iterator();
		}
		return iterator;
	}

	public LazyIterator(Map map) {
		this.map = map;
	}
	
	public boolean hasNext() {
		return getIterator().hasNext();
	}

	public Object next() {
		return getIterator().next();
	}

	public void remove() {
		throw new UnsupportedOperationException();
	}

}