##### Coverage Report - org.apache.any23.util.ReaderInputStream

Classes in this File | Line Coverage | Branch Coverage | Complexity
ReaderInputStream |
0% | 0/62
0% | 0/36
| 4.111111111111111;4.111

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 |  |
18 |  |
     package org.apache.any23.util;
19 |  |
20 |  |
     import java.io.IOException;
21 |  |
     import java.io.InputStream;
22 |  |
     import java.io.Reader;
23 |  |
24 |  |
     /**
25 |  |
      * Adapts a <code>Reader</code> as an <code>InputStream</code>.
26 |  |
      * Adapted from <CODE>StringInputStream</CODE>.
27 |  |
      *
28 |  |
      */
29 |  |
     public class ReaderInputStream extends InputStream {
30 |  |
31 |  |
         /** Source Reader */
32 |  |
         private Reader in;
33 |  |
34 | 0 |
         private String encoding = System.getProperty("file.encoding");
35 |  |
36 |  |
         private byte[] slack;
37 |  |
38 |  |
         private int begin;
39 |  |
40 |  |
         /**
41 |  |
          * Construct a <CODE>ReaderInputStream</CODE>
42 |  |
          * for the specified <CODE>Reader</CODE>.
43 |  |
          *
44 |  |
          * @param reader   <CODE>Reader</CODE>.  Must not be <code>null</code>.
45 |  |
          */
46 | 0 |
         public ReaderInputStream(Reader reader) {
47 | 0 |
             in = reader;
48 | 0 |
         }
49 |  |
50 |  |
         /**
51 |  |
          * Construct a <CODE>ReaderInputStream</CODE>
52 |  |
          * for the specified <CODE>Reader</CODE>,
53 |  |
          * with the specified encoding.
54 |  |
          *
55 |  |
          * @param reader     non-null <CODE>Reader</CODE>.
56 |  |
          * @param encoding   non-null <CODE>String</CODE> encoding.
57 |  |
          */
58 |  |
         public ReaderInputStream(Reader reader, String encoding) {
59 | 0 |
             this(reader);
60 | 0 |
             if (encoding == null) {
61 | 0 |
                 throw new IllegalArgumentException("encoding must not be null");
62 |  |
             } else {
63 | 0 |
                 this.encoding = encoding;
64 |  |
             }
65 | 0 |
         }
66 |  |
67 |  |
         /**
68 |  |
          * Reads from the <CODE>Reader</CODE>, returning the same value.
69 |  |
          *
70 |  |
          * @return the value of the next character in the <CODE>Reader</CODE>.
71 |  |
          *
72 |  |
          * @exception IOException if the original <code>Reader</code> fails to be read
73 |  |
          */
74 |  |
         public synchronized int read() throws IOException {
75 | 0 |
             if (in == null) {
76 | 0 |
                 throw new IOException("Stream Closed");
77 |  |
             }
78 |  |
79 |  |
             byte result;
80 | 0 |
             if (slack != null && begin < slack.length) {
81 | 0 |
                 result = slack[begin];
82 | 0 |
                 if (++begin == slack.length) {
83 | 0 |
                     slack = null;
84 |  |
                 }
85 |  |
             } else {
86 | 0 |
                 byte[] buf = new byte[1];
87 | 0 |
                 if (read(buf, 0, 1) <= 0) {
88 | 0 |
                     result = -1;
89 |  |
                 }
90 | 0 |
                 result = buf[0];
91 |  |
             }
92 |  |
93 | 0 |
             if (result < -1) {
94 | 0 |
                 result += 256;
95 |  |
             }
96 |  |
97 | 0 |
             return result;
98 |  |
         }
99 |  |
100 |  |
         /**
101 |  |
          * Reads from the <code>Reader</code> into a byte array
102 |  |
          *
103 |  |
          * @param b  the byte array to read into
104 |  |
          * @param off the offset in the byte array
105 |  |
          * @param len the length in the byte array to fill
106 |  |
          * @return the actual number read into the byte array, -1 at
107 |  |
          *         the end of the stream
108 |  |
          * @exception IOException if an error occurs
109 |  |
          */
110 |  |
         public synchronized int read(byte[] b, int off, int len)
111 |  |
             throws IOException {
112 | 0 |
             if (in == null) {
113 | 0 |
                 throw new IOException("Stream Closed");
114 |  |
             }
115 |  |
116 | 0 |
             while (slack == null) {
117 | 0 |
                 char[] buf = new char[len]; // might read too much
118 | 0 |
                 int n = in.read(buf);
119 | 0 |
                 if (n == -1) {
120 | 0 |
                     return -1;
121 |  |
                 }
122 | 0 |
                 if (n > 0) {
123 | 0 |
                     slack = new String(buf, 0, n).getBytes(encoding);
124 | 0 |
                     begin = 0;
125 |  |
                 }
126 | 0 |
             }
127 |  |
128 | 0 |
             if (len > slack.length - begin) {
129 | 0 |
                 len = slack.length - begin;
130 |  |
             }
131 |  |
132 | 0 |
             System.arraycopy(slack, begin, b, off, len);
133 |  |
134 | 0 |
             if ((begin += len) >= slack.length) {
135 | 0 |
                 slack = null;
136 |  |
             }
137 |  |
138 | 0 |
             return len;
139 |  |
         }
140 |  |
141 |  |
         /**
142 |  |
          * Marks the read limit of the StringReader.
143 |  |
          *
144 |  |
          * @param limit the maximum limit of bytes that can be read before the
145 |  |
          *              mark position becomes invalid
146 |  |
          */
147 |  |
         public synchronized void mark(final int limit) {
148 |  |
             try {
149 | 0 |
                 in.mark(limit);
150 | 0 |
             } catch (IOException ioe) {
151 | 0 |
                 throw new RuntimeException(ioe.getMessage());
152 | 0 |
             }
153 | 0 |
         }
154 |  |
155 |  |
156 |  |
         /**
157 |  |
          * @return   the current number of bytes ready for reading
158 |  |
          * @exception IOException if an error occurs
159 |  |
          */
160 |  |
         public synchronized int available() throws IOException {
161 | 0 |
             if (in == null) {
162 | 0 |
                 throw new IOException("Stream Closed");
163 |  |
             }
164 | 0 |
             if (slack != null) {
165 | 0 |
                 return slack.length - begin;
166 |  |
             }
167 | 0 |
             if (in.ready()) {
168 | 0 |
                 return 1;
169 |  |
             } else {
170 | 0 |
                 return 0;
171 |  |
             }
172 |  |
         }
173 |  |
174 |  |
         /**
175 |  |
          * @return false - mark is not supported
176 |  |
          */
177 |  |
         public boolean markSupported () {
178 | 0 |
             return false;   // would be imprecise
179 |  |
         }
180 |  |
181 |  |
         /**
182 |  |
          * Resets the StringReader.
183 |  |
          *
184 |  |
          * @exception IOException if the StringReader fails to be reset
185 |  |
          */
186 |  |
         public synchronized void reset() throws IOException {
187 | 0 |
             if (in == null) {
188 | 0 |
                 throw new IOException("Stream Closed");
189 |  |
             }
190 | 0 |
             slack = null;
191 | 0 |
             in.reset();
192 | 0 |
         }
193 |  |
194 |  |
         /**
195 |  |
          * Closes the Stringreader.
196 |  |
          *
197 |  |
          * @exception IOException if the original StringReader fails to be closed
198 |  |
          */
199 |  |
         public synchronized void close() throws IOException {
200 | 0 |
             if (in != null) {
201 | 0 |
                 in.close();
202 | 0 |
                 slack = null;
203 | 0 |
                 in = null;
204 |  |
             }
205 | 0 |
         }
206 |  |
     }