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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.collections.primitives.adapters.io;
18  
19  import java.io.Reader;
20  
21  import org.apache.commons.collections.primitives.CharIterator;
22  
23  /**
24   * Adapts a {@link CharIterator} to the {@link Reader} interface.
25   * 
26   * @version $Revision: 480462 $ $Date: 2006-11-29 03:15:00 -0500 (Wed, 29 Nov 2006) $
27   * @author Rodney Waldhoff
28   */
29  public class CharIteratorReader extends Reader {
30  
31      public CharIteratorReader(CharIterator in) {
32          this.iterator= in;
33      }
34  
35      public int read(char[] buf, int off, int len) {
36          if(iterator.hasNext()) {
37              int count = 0;
38              while(iterator.hasNext() && count < len) {
39                  buf[off + count] = iterator.next();
40                  count++;
41              }
42              return count;
43          } else {
44              return -1;
45          }
46      }
47      
48      public void close() {        
49      }
50  
51      public static Reader adapt(CharIterator in) {
52          return null == in ? null : new CharIteratorReader(in);
53      }
54      
55      private CharIterator iterator = null;
56  
57  }