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Java > Open Source Codes > org > apache > commons > collections > primitives > adapters > io > CharIteratorReader


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 JavaDoc;
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 00:15:00 -0800 (Wed, 29 Nov 2006) $
27  * @author Rodney Waldhoff
28  */
29 public class CharIteratorReader extends Reader JavaDoc {
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 JavaDoc adapt(CharIterator in) {
52         return null == in ? null : new CharIteratorReader(in);
53     }
54     
55     private CharIterator iterator = null;
56
57 }
58
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