Clover coverage report - Code Coverage for tapestry release 4.0-alpha-3
Coverage timestamp: Mon May 16 2005 09:05:49 EDT
file stats: LOC: 181   Methods: 11
NCLOC: 95   Classes: 1
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 Source file Conditionals Statements Methods TOTAL
ExtendedReader.java 59.1% 54.2% 45.5% 54.3%
coverage coverage
 1   
 // Copyright 2004, 2005 The Apache Software Foundation
 2   
 //
 3   
 // Licensed under the Apache License, Version 2.0 (the "License");
 4   
 // you may not use this file except in compliance with the License.
 5   
 // You may obtain a copy of the License at
 6   
 //
 7   
 //     http://www.apache.org/licenses/LICENSE-2.0
 8   
 //
 9   
 // Unless required by applicable law or agreed to in writing, software
 10   
 // distributed under the License is distributed on an "AS IS" BASIS,
 11   
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 12   
 // See the License for the specific language governing permissions and
 13   
 // limitations under the License.
 14   
 
 15   
 package org.apache.tapestry.util.text;
 16   
 
 17   
 import java.io.IOException;
 18   
 import java.io.Reader;
 19   
 
 20   
 /**
 21   
  * A Reader that provides some additional functionality, such as peek().
 22   
  * 
 23   
  * @author mb
 24   
  * @since 4.0
 25   
  */
 26   
 public class ExtendedReader extends Reader
 27   
 {
 28   
     private Reader _reader;
 29   
     private boolean _hasBufferedChar = false;
 30   
     private char _bufferedChar;
 31   
     
 32   
     /**
 33   
      * Creates a new extended reader that reads from the provided object
 34   
      * 
 35   
      * @param in the Reader to get data from
 36   
      */
 37  79
     public ExtendedReader(Reader in)
 38   
     {
 39  79
         _reader = in;
 40   
     }
 41   
 
 42   
     /**
 43   
      * Returns the next character in the stream without actually comitting the read.
 44   
      * Multiple consequtive invocations of this method should return the same value.
 45   
      * 
 46   
      * @return the next character waiting in the stream or -1 if the end of the stream is reached
 47   
      * @throws IOException if an error occurs
 48   
      */
 49  119606
     public synchronized int peek() throws IOException
 50   
     {
 51  119606
         if (!_hasBufferedChar) {
 52  57214
             int bufferedChar = read();
 53  57214
             if (bufferedChar < 0)
 54  188
                 return bufferedChar;
 55  57026
             _bufferedChar = (char) bufferedChar;
 56  57026
             _hasBufferedChar = true;
 57   
         }
 58  119418
         return _bufferedChar;
 59   
     }
 60   
     
 61   
     /**
 62   
      * Determines whether the end of the stream is reached
 63   
      * 
 64   
      * @return true if at the end of stream
 65   
      * @throws IOException if an error occurs
 66   
      */
 67  52526
     public synchronized boolean isEndOfStream() throws IOException
 68   
     {
 69  52526
         return peek() < 0;
 70   
     }
 71   
 
 72   
     /**
 73   
      * Skips the next characters until a character that does not match the provided rule is reached.
 74   
      * 
 75   
      * @param matcher the object determining whether a character should be skipped
 76   
      * @throws IOException if an error occurs
 77   
      */
 78  3890
     public synchronized void skipCharacters(ICharacterMatcher matcher) throws IOException
 79   
     {
 80  3890
         while (true) {
 81  52526
             if (isEndOfStream())
 82  77
                 break;
 83  52449
             char ch = (char) peek();
 84  52449
             if (!matcher.matches(ch))
 85  3813
                 break;
 86  48636
             read();
 87   
         }
 88   
     }
 89   
     
 90   
     /**
 91   
      * Reads the next characters until a character that does not match the provided rule is reached.
 92   
      * 
 93   
      * @param matcher the object determining whether a character should be read
 94   
      * @return the string of characters read
 95   
      * @throws IOException if an error occurs
 96   
      */
 97  0
     public synchronized String readCharacters(ICharacterMatcher matcher) throws IOException
 98   
     {
 99  0
         StringBuffer buf = new StringBuffer();
 100  0
         while (true) {
 101  0
             if (isEndOfStream())
 102  0
                 break;
 103  0
             char ch = (char) peek();
 104  0
             if (!matcher.matches(ch))
 105  0
                 break;
 106  0
             buf.append(read());
 107   
         }
 108  0
         return buf.toString();
 109   
     }
 110   
     
 111   
     /** 
 112   
      * @see java.io.FilterReader#read(char[], int, int)
 113   
      */
 114  114259
     public synchronized int read(char[] cbuf, int off, int len) throws IOException
 115   
     {
 116  114259
         if (len <= 0)
 117  0
             return 0;
 118   
         
 119  114259
         boolean extraChar = _hasBufferedChar;
 120  114259
         if (_hasBufferedChar) {
 121  57026
             _hasBufferedChar = false;
 122  57026
             cbuf[off++] = _bufferedChar;
 123  57026
             len--;
 124   
         }
 125   
 
 126  114259
         int read = _reader.read(cbuf, off, len);
 127  114259
         if (extraChar)
 128  57026
             read++;
 129  114259
         return read;
 130   
     }
 131   
     
 132   
     /** 
 133   
      * @see java.io.FilterReader#ready()
 134   
      */
 135  0
     public synchronized boolean ready() throws IOException
 136   
     {
 137  0
         if (_hasBufferedChar)
 138  0
             return true;
 139  0
         return _reader.ready();
 140   
     }
 141   
     
 142   
     /** 
 143   
      * @see java.io.FilterReader#markSupported()
 144   
      */
 145  0
     public synchronized boolean markSupported()
 146   
     {
 147  0
         return false;
 148   
     }
 149   
     
 150   
     /** 
 151   
      * @see java.io.FilterReader#reset()
 152   
      */
 153  0
     public synchronized void reset() throws IOException
 154   
     {
 155  0
         _hasBufferedChar = false;
 156  0
         _reader.reset();
 157   
     }
 158   
     
 159   
     /** 
 160   
      * @see java.io.FilterReader#skip(long)
 161   
      */
 162  0
     public synchronized long skip(long n) throws IOException
 163   
     {
 164  0
         if (_hasBufferedChar && n > 0) {
 165  0
             _hasBufferedChar = false;
 166  0
             n--;
 167   
         }
 168  0
         return _reader.skip(n);
 169   
     }
 170   
 
 171   
     /** 
 172   
      * @see java.io.Reader#close()
 173   
      */
 174  0
     public synchronized void close() throws IOException
 175   
     {
 176  0
         _hasBufferedChar = false;
 177  0
         _reader.close();
 178   
     }
 179   
     
 180   
 }
 181