001/*
002 *  Copyright 2010 Anyware Services
003 *
004 *  Licensed under the Apache License, Version 2.0 (the "License");
005 *  you may not use this file except in compliance with the License.
006 *  You may obtain a copy of the License at
007 *
008 *      http://www.apache.org/licenses/LICENSE-2.0
009 *
010 *  Unless required by applicable law or agreed to in writing, software
011 *  distributed under the License is distributed on an "AS IS" BASIS,
012 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 *  See the License for the specific language governing permissions and
014 *  limitations under the License.
015 */
016package org.ametys.plugins.repository;
017
018import java.util.Collection;
019import java.util.Iterator;
020
021/**
022 * Basic implementation of an {@link AmetysObjectIterable} based on an existing {@link Collection}.
023 * @param <A> the actual type of {@link AmetysObject}s
024 */
025public class CollectionIterable<A extends AmetysObject> implements AmetysObjectIterable<A>
026{
027    private Collection<A> _collection;
028    
029    /**
030     * Creates a {@link CollectionIterable}.
031     * @param collection the {@link AmetysObject}s collection
032     */
033    public CollectionIterable(Collection<A> collection)
034    {
035        _collection = collection;
036    }
037    
038    public long getSize()
039    {
040        return _collection.size();
041    }
042    
043    public AmetysObjectIterator<A> iterator()
044    {
045        return new CollectionIterator(_collection.iterator(), _collection.size());
046    }
047    
048    public void close()
049    {
050        // nothing to do
051    }
052    
053    class CollectionIterator implements AmetysObjectIterator<A>
054    {
055        private Iterator<A> _it;
056        private int _pos;
057        private long _size;
058        
059        public CollectionIterator(Iterator<A> it, long size)
060        {
061            _it = it;
062            _size = size;
063        }
064        
065        public boolean hasNext()
066        {
067            return _it.hasNext();
068        }
069
070        public A next()
071        {
072            _pos++;
073            return _it.next();
074        }
075
076        public long getSize()
077        {
078            return _size;
079        }
080        
081        public long getPosition()
082        {
083            return _pos;
084        }
085    }
086}