001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.collections.primitives.adapters.io;
018
019import java.io.Reader;
020
021import org.apache.commons.collections.primitives.CharIterator;
022
023/**
024 * Adapts a {@link CharIterator} to the {@link Reader} interface.
025 * 
026 * @version $Revision: 480462 $ $Date: 2006-11-29 03:15:00 -0500 (Wed, 29 Nov 2006) $
027 * @author Rodney Waldhoff
028 */
029public class CharIteratorReader extends Reader {
030
031    public CharIteratorReader(CharIterator in) {
032        this.iterator= in;
033    }
034
035    public int read(char[] buf, int off, int len) {
036        if(iterator.hasNext()) {
037            int count = 0;
038            while(iterator.hasNext() && count < len) {
039                buf[off + count] = iterator.next();
040                count++;
041            }
042            return count;
043        } else {
044            return -1;
045        }
046    }
047    
048    public void close() {        
049    }
050
051    public static Reader adapt(CharIterator in) {
052        return null == in ? null : new CharIteratorReader(in);
053    }
054    
055    private CharIterator iterator = null;
056
057}