Application: gvSIG desktop » Library: org.gvsig.tools

package org.gvsig.tools.util;

import java.util.Iterator;

public class ChainedIterator<T> implements Iterator<T> {

    private final Iterator<T>[] iterators;

    private int current;

    public ChainedIterator(Iterator<T>... iterators) {

        this.iterators = iterators;

        this.current = 0;

    }

    @Override

    public boolean hasNext() {

        if( this.iterators == null ) {

            return false;

        }

        while (this.current < this.iterators.length) {

            Iterator<T> it = this.iterators[this.current];

            if( it!=null ) {

                if (it.hasNext()) {

                    return true;

                }

            }

            this.current++;

        }

        return false;

    }

    @Override

    public T next() {

        if( this.iterators == null ) {

            return null;

        }

        Iterator<T> it = this.iterators[this.current];

        if( it==null ) {

            return null;

        }

        return it.next();

    }

}