in - A Reader object providing the underlying stream.
Must not be null.
public final int read()
Returns the next character in the filtered stream. One line is read
from the original input, and the prefix added. The resulting
line is then used until it ends, at which point the next original line
is read, etc.
read in class java.io.FilterReader
the next character in the resulting stream, or -1
if the end of the resulting stream has been reached
java.io.IOException - if the underlying stream throws an IOException
public final void setPrefix(java.lang.String prefix)
Sets the prefix to add at the start of each input line.
prefix - The prefix to add at the start of each input line.
May be null, in which case no prefix
public final java.io.Reader chain(java.io.Reader rdr)
Creates a new PrefixLines filter using the passed in
Reader for instantiation.