Coverage Report - org.apache.commons.collections.primitives.adapters.io.ReaderCharIterator
 
Classes in this File Line Coverage Branch Coverage Complexity
ReaderCharIterator
100%
22/22
100%
8/8
2
 
 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.IOException;
 20  
 import java.io.Reader;
 21  
 import java.util.NoSuchElementException;
 22  
 
 23  
 import org.apache.commons.collections.primitives.CharIterator;
 24  
 
 25  
 /**
 26  
  * Adapts a {@link Reader} to the {@link CharIterator} interface.
 27  
  * 
 28  
  * @version $Revision: 480462 $ $Date: 2006-11-29 03:15:00 -0500 (Wed, 29 Nov 2006) $
 29  
  * @author Rodney Waldhoff
 30  
  */
 31  
 public class ReaderCharIterator implements CharIterator {
 32  
 
 33  17
     public ReaderCharIterator(Reader in) {
 34  17
         this.reader = in;
 35  17
     }
 36  
 
 37  
     public static CharIterator adapt(Reader in) {
 38  2
         return null == in ? null : new ReaderCharIterator(in);
 39  
     }
 40  
     
 41  
     public boolean hasNext() {
 42  193
         ensureNextAvailable();
 43  191
         return (-1 != next);
 44  
     }
 45  
 
 46  
     public char next() {
 47  96
         if(!hasNext()) {
 48  3
             throw new NoSuchElementException("No next element");
 49  
         } else {
 50  92
             nextAvailable = false;
 51  92
             return (char)next;
 52  
         }
 53  
     }
 54  
     
 55  
     /**
 56  
      * Not supported.
 57  
      * @throws UnsupportedOperationException
 58  
      */
 59  
     public void remove() throws UnsupportedOperationException {
 60  1
         throw new UnsupportedOperationException("remove() is not supported here");
 61  
     }
 62  
 
 63  
     private void ensureNextAvailable() {
 64  193
         if(!nextAvailable) {
 65  99
             readNext();
 66  
         }
 67  191
     }
 68  
 
 69  
     private void readNext() {
 70  
         try {
 71  99
             next = reader.read();
 72  97
             nextAvailable = true;
 73  2
         } catch(IOException e) {
 74  
             // TODO: Use a tunnelled exception instead? 
 75  
             // See http://radio.weblogs.com/0122027/2003/04/01.html#a7, for example            
 76  2
             throw new RuntimeException(e.toString());
 77  97
         }
 78  97
     }
 79  
     
 80  17
     private Reader reader = null;
 81  17
     private boolean nextAvailable = false;
 82  
     private int next;
 83  
 
 84  
 }