Source Code Cross Referenced for LexReader.java in  » Web-Framework » RSF » uk » org » ponder » streamutil » read » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Framework » RSF » uk.org.ponder.streamutil.read 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * Created on 07-Oct-2003
03:         */
04:        package uk.org.ponder.streamutil.read;
05:
06:        import java.io.IOException;
07:        import java.io.PushbackReader;
08:        import java.io.Reader;
09:
10:        /**
11:         * A PushbackReader with exactly one byte of pushback, which silently swallows any
12:         * EOF exceptions. Instead, EOF is reported by returning the value (char)-1 which
13:         * Unicode defines to be nothing useful. EOF may be independently verified by 
14:         * checking the EOF() method.
15:         * @author Bosmon
16:         */
17:        //TODO: replace Reader with a non-synchronized infrastructure, a la PrintOutputStream.
18:        public class LexReader extends PushbackReader {
19:            private int read = 0;
20:            private boolean EOF = false;
21:
22:            /** Creates a LexReader wrapping the supplied Reader */
23:            public LexReader(Reader r) {
24:                super (r);
25:            }
26:
27:            /** Checks if end of the wrapped stream has been reached.
28:             * @return <code>true</code> if the stream has reached the end of file.
29:             */
30:            public boolean EOF() {
31:                return EOF;
32:            }
33:
34:            /** Reads a single character from the stream and returns it. If the stream
35:             * has reached the end of file, return the value (char)-1.
36:             * @return The character that was read.
37:             * @throws IOException If a read error other than EOF occurs.
38:             */
39:            public char get() throws IOException {
40:                int c = read();
41:                if (c != -1) {
42:                    ++read;
43:                } else {
44:                    EOF = true;
45:                }
46:                return (char) c;
47:            }
48:        }
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