Package org.codehaus.groovy.control.io

Interface ReaderSource

All Superinterfaces:

HasCleanup

All Known Implementing Classes:

AbstractReaderSource, FileReaderSource, InputStreamReaderSource, StringReaderSource, URLReaderSource

public interface ReaderSource
extends HasCleanup

An interface for things that can supply (and potentially resupply) a Reader on a source stream.

Version:

$Id$

Author:

Chris Poirier

Method Summary

Modifier and Type	Method	Description
boolean	canReopenSource()	Returns true if the source can be restarted (ie.
void	cleanup()	Cleans up any cached resources used by getLine().
java.lang.String	getLine(int lineNumber, Janitor janitor)	Returns a line from the source, or null, if unavailable.
java.io.Reader	getReader()	Returns a new Reader on the underlying source object.

Method Detail

getReader

java.io.Reader getReader()
                  throws java.io.IOException

Returns a new Reader on the underlying source object. Returns null if the source can't be reopened.

Returns:

the reader to the resource

Throws:

java.io.IOException - if there was an error opening for stream

canReopenSource

boolean canReopenSource()

Returns true if the source can be restarted (ie. if getReader() will return non-null on subsequent calls.

Returns:

true if the resource can be reopened for reading

getLine

java.lang.String getLine(int lineNumber,
                         Janitor janitor)

Returns a line from the source, or null, if unavailable. If you supply a Janitor, resources will be cached.

Parameters:

lineNumber - the number of the line of interest

janitor - helper to clean up afterwards

Returns:

the line of interest

cleanup

void cleanup()

Cleans up any cached resources used by getLine().

Specified by:

cleanup in interface HasCleanup