Coverage Report - org.apache.commons.io.input.CharSequenceReader
 
Classes in this File Line Coverage Branch Coverage Complexity
CharSequenceReader
89%
33/37
72%
16/22
3
 
 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.io.input;
 18  
 
 19  
 import java.io.Reader;
 20  
 import java.io.Serializable;
 21  
 
 22  
 /**
 23  
  * {@link Reader} implementation that can read from String, StringBuffer,
 24  
  * StringBuilder or CharBuffer.
 25  
  * <p>
 26  
  * <strong>Note:</strong> Supports {@link #mark(int)} and {@link #reset()}.
 27  
  *
 28  
  * @version $Id: CharSequenceReader.java 1415850 2012-11-30 20:51:39Z ggregory $
 29  
  * @since 1.4
 30  
  */
 31  
 public class CharSequenceReader extends Reader implements Serializable {
 32  
 
 33  
     private final CharSequence charSequence;
 34  
     private int idx;
 35  
     private int mark;
 36  
 
 37  
     /**
 38  
      * Construct a new instance with the specified character sequence.
 39  
      *
 40  
      * @param charSequence The character sequence, may be {@code null}
 41  
      */
 42  14
     public CharSequenceReader(final CharSequence charSequence) {
 43  14
         this.charSequence = charSequence != null ? charSequence : "";
 44  14
     }
 45  
 
 46  
     /**
 47  
      * Close resets the file back to the start and removes any marked position.
 48  
      */
 49  
     @Override
 50  
     public void close() {
 51  14
         idx = 0;
 52  14
         mark = 0;
 53  14
     }
 54  
 
 55  
     /**
 56  
      * Mark the current position.
 57  
      *
 58  
      * @param readAheadLimit ignored
 59  
      */
 60  
     @Override
 61  
     public void mark(final int readAheadLimit) {
 62  2
         mark = idx;
 63  2
     }
 64  
 
 65  
     /**
 66  
      * Mark is supported (returns true).
 67  
      *
 68  
      * @return {@code true}
 69  
      */
 70  
     @Override
 71  
     public boolean markSupported() {
 72  2
         return true;
 73  
     }
 74  
 
 75  
     /**
 76  
      * Read a single character.
 77  
      *
 78  
      * @return the next character from the character sequence
 79  
      * or -1 if the end has been reached.
 80  
      */
 81  
     @Override
 82  
     public int read() {
 83  86
         if (idx >= charSequence.length()) {
 84  8
             return -1;
 85  
         } else {
 86  78
             return charSequence.charAt(idx++);
 87  
         }
 88  
     }
 89  
 
 90  
     /**
 91  
      * Read the sepcified number of characters into the array.
 92  
      *
 93  
      * @param array The array to store the characters in
 94  
      * @param offset The starting position in the array to store
 95  
      * @param length The maximum number of characters to read
 96  
      * @return The number of characters read or -1 if there are
 97  
      * no more
 98  
      */
 99  
     @Override
 100  
     public int read(final char[] array, final int offset, final int length) {
 101  14
         if (idx >= charSequence.length()) {
 102  4
             return -1;
 103  
         }
 104  10
         if (array == null) {
 105  0
             throw new NullPointerException("Character array is missing");
 106  
         }
 107  10
         if (length < 0 || offset < 0 || offset + length > array.length) {
 108  0
             throw new IndexOutOfBoundsException("Array Size=" + array.length +
 109  
                     ", offset=" + offset + ", length=" + length);
 110  
         }
 111  10
         int count = 0;
 112  34
         for (int i = 0; i < length; i++) {
 113  26
             final int c = read();
 114  26
             if (c == -1) {
 115  2
                 return count;
 116  
             }
 117  24
             array[offset + i] = (char)c;
 118  24
             count++;
 119  
         }
 120  8
         return count;
 121  
     }
 122  
 
 123  
     /**
 124  
      * Reset the reader to the last marked position (or the beginning if
 125  
      * mark has not been called).
 126  
      */
 127  
     @Override
 128  
     public void reset() {
 129  6
         idx = mark;
 130  6
     }
 131  
 
 132  
     /**
 133  
      * Skip the specified number of characters.
 134  
      *
 135  
      * @param n The number of characters to skip
 136  
      * @return The actual number of characters skipped
 137  
      */
 138  
     @Override
 139  
     public long skip(final long n) {
 140  12
         if (n < 0) {
 141  0
             throw new IllegalArgumentException(
 142  
                     "Number of characters to skip is less than zero: " + n);
 143  
         }
 144  12
         if (idx >= charSequence.length()) {
 145  4
             return -1;
 146  
         }
 147  8
         final int dest = (int)Math.min(charSequence.length(), idx + n);
 148  8
         final int count = dest - idx;
 149  8
         idx = dest;
 150  8
         return count;
 151  
     }
 152  
 
 153  
     /**
 154  
      * Return a String representation of the underlying
 155  
      * character sequence.
 156  
      *
 157  
      * @return The contents of the character sequence
 158  
      */
 159  
     @Override
 160  
     public String toString() {
 161  0
         return charSequence.toString();
 162  
     }
 163  
 }