Decorator of FilterInputStream in Java I/O

import java.io.*;

public class InputTest {
public static void main(String[] args) throws IOException {
int c;

try {
InputStream in =
new LowerCaseInputStream(
new BufferedInputStream(
new FileInputStream("DiagramEditor.java")));

while((c = in.read()) >= 0) {
System.out.print((char)c);
}

in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public class LowerCaseInputStream extends FilterInputStream {


/** Decorator Type that maintains a reference of Decorated component
is consistent with Decorated component Type
*/
public LowerCaseInputStream(InputStream in) {
super(in);
}

public int read() throws IOException {
int c = super.read();
return (c == -1 ? c : Character.toLowerCase((char)c));
}

public int read(byte[] b, int offset, int len) throws IOException {
int result = super.read(b, offset, len);
for (int i = offset; i <>
/*****************************Java API --read()************************************* InputStream
FileInputStream StringBufferInputStream ByteArrayInputStream FilterInputStream
PushbackInputStream BufferedInputStream DataInputStream LineNumberInputStream
read
public int read(byte[] b,
int off,
int len)
throws IOException reads up to len bytes of data from the input stream into an array of bytes. An attempt is made to read as many as len bytes, but a smaller number may be read, possibly zero. The number of bytes actually read is returned as an integer.
This method blocks until input data is available, end of file is detected, or an exception is thrown.

If b is null, a NullPointerException is thrown.

If off is negative, or len is negative, or off+len is greater than the length of the array b, then an IndexOutOfBoundsException is thrown.

If len is zero, then no bytes are read and 0 is returned; otherwise, there is an attempt to read at least one byte. If no byte is available because the stream is at end of file, the value -1 is returned; otherwise, at least one byte is read and stored into b.

The first byte read is stored into element b[off], the next one into b[off+1], and so on. The number of bytes read is, at most, equal to len. Let k be the number of bytes actually read; these bytes will be stored in elements b[off] through b[off+k-1], leaving elements b[off+k] through b[off+len-1] unaffected.

In every case, elements b[0] through b[off] and elements b[off+len] through b[b.length-1] are unaffected.

If the first byte cannot be read for any reason other than end of file, then an IOException is thrown. In particular, an IOException is thrown if the input stream has been closed.

The read(b, off, len) method for class InputStream simply calls the method read() repeatedly. If the first such call results in an IOException, that exception is returned from the call to the read(b, off, len) method. If any subsequent call to read() results in a IOException, the exception is caught and treated as if it were end of file; the bytes read up to that point are stored into b and the number of bytes read before the exception occurred is returned. Subclasses are encouraged to provide a more efficient implementation of this method.


Parameters:
b - the buffer into which the data is read.
off - the start offset in array b at which the data is written.
len - the maximum number of bytes to read.
Returns:
the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.
Throws:
IOException - if an I/O error occurs.
NullPointerException - if b is null.
See Also:
read()
*/