in - A Reader object providing the underlying stream.
Must not be null.
public final int read()
Returns the next character in the filtered stream. The original
stream is first read in fully, and the Ant properties are expanded.
The results of this expansion are then queued so they can be read
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 java.io.Reader chain(java.io.Reader rdr)
Creates a new ExpandProperties filter using the passed in
Reader for instantiation.