joinediterator.java

用Java实现的23个常用设计模式源代码

//$Id: JoinedIterator.java,v 1.3.2.1 2003/11/09 01:46:25 oneovthafew Exp $
package net.sf.hibernate.util;

import java.util.Iterator;

public class JoinedIterator implements Iterator {
	private Iterator[] iterators;
	private int current;
	
	public JoinedIterator(Iterator[] iterators) {
		this.iterators = iterators;
		this.current = 0;
	}
	
	public JoinedIterator(Iterator first, Iterator second) {
		this( new Iterator[] { first, second } );
	}
	
	public boolean hasNext() {
		for ( int i = current; i<iterators.length; i++ ) {
			if ( iterators[i].hasNext() ) return true;
		}
		return false;
	}
	
	public Object next() {
		if ( iterators[current].hasNext() ) {
			return iterators[current].next();
		}
		else {
			current++;
			return next();
		}
	}
	
	public void remove() {
		iterators[current].remove();
	}
	
}