/*

  * Licensed to the Apache Software Foundation (ASF) under one or more

  * contributor license agreements.  See the NOTICE file distributed with

  * this work for additional information regarding copyright ownership.

  * The ASF licenses this file to You under the Apache License, Version 2.0

  * (the "License"); you may not use this file except in compliance with

  * the License.  You may obtain a copy of the License at

  *

  *     http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.apache.commons.collections.primitives.adapters.io;

 import java.io.Reader;

 import org.apache.commons.collections.primitives.CharIterator;

 /**

  * Adapts a {@link CharIterator} to the {@link Reader} interface.

  * 

  * @version $Revision: 480462 $ $Date: 2006-11-29 03:15:00 -0500 (Wed, 29 Nov 2006) $

  * @author Rodney Waldhoff

  */

 public class CharIteratorReader extends Reader {

     public CharIteratorReader(CharIterator in) {

         this.iterator= in;

     }

     public int read(char[] buf, int off, int len) {

         if(iterator.hasNext()) {

             int count = 0;

             while(iterator.hasNext() && count < len) {

                 buf[off + count] = iterator.next();

                 count++;

             }

             return count;

         } else {

             return -1;

         }

     }

     public void close() {        

     }

     public static Reader adapt(CharIterator in) {

         return null == in ? null : new CharIteratorReader(in);

     }

     private CharIterator iterator = null;

 }