MultiIterator.java

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/*
 * Created on Sep 22, 2009
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
package edu.tum.cs.util.datastruct;

import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.Vector;

public class MultiIterator<T> implements Iterable<T> {

        Vector<Iterable<T>> collections = new Vector<Iterable<T>>();    
        
        public Iterator<T> iterator() {
                return new LocalIterator<T>(collections);
        }
        
        public void add(Iterable<T> i) {
                collections.add(i);
        }
        
        public void add(T obj) {
                Vector<T> v = new Vector<T>(1);
                v.add(obj);
                add(v);
        }
        
        public boolean isEmpty() {
                if(collections.size() == 0)
                        return true;
                return iterator().hasNext();
        }
        
        @SuppressWarnings("hiding")
        public class LocalIterator<T> implements Iterator<T> {

                Vector<Iterable<T>> collections;
                Iterator<Iterable<T>> ii;
                Iterator<T> curI;
                
                public LocalIterator(Iterable<Iterable<T>> collections) {
                        ii = collections.iterator();
                        curI = ii.next().iterator();
                }
                
                public boolean hasNext() {              
                        if(curI.hasNext())
                                return true;
                        while(!curI.hasNext()) {
                                if(!ii.hasNext())
                                        return false;
                                curI = ii.next().iterator();
                        }
                        return true;
                }

                public T next() {
                        if(!hasNext())
                                throw new NoSuchElementException();
                        return curI.next();
                }

                public void remove() {
                        throw new RuntimeException("not implemented");
                }               
        }
        
}

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mod_vis
Author(s): Moritz Tenorth, Jakob Engel
autogenerated on Fri Jan 11 09:54:14 2013