filters/TailFilter.php

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Reads the last <code>n</code> lines of a stream. (Default is last10 lines.)

Example:

Or:


  
Author
Yannick Lecaillez  
Author
hans lellelid, hans@velum.net  
Copyright
� 2003 seasonfive. All rights reserved  
Package
phing.filters  
See
\BaseParamFilterReader  
Version
$Id$  

\TailFilter

Package: phing\filters

Reads the last <code>n</code> lines of a stream. (Default is last10 lines.)

Example:

Or:


  
Parent(s)
\BaseParamFilterReader < \BaseFilterReader < \FilterReader < \Reader
See
\BaseParamFilterReader  
Author
Yannick Lecaillez  
Author
hans lellelid, hans@velum.net  
Copyright
� 2003 seasonfive. All rights reserved  
Version
$Id$  

Constants

Constantstring  LINES_KEY = "lines"

Parameter name for the number of lines to be returned.

string

Properties

Propertyprivatearray  $_lineBuffer= 'array()'

Array to hold lines.

Default valuearray()Details
Type
array
Propertyprivateinteger  $_lines= '10'

Number of lines to be returned in the filtered stream.

Default value10Details
Type
integer
Propertyprotected  $_parameters= 'array()'
inherited

The passed in parameter array.

Inherited from: \BaseParamFilterReader::$$_parameters
Default valuearray()Details
Type
n/a
Inherited_from
\BaseParamFilterReader::$$_parameters  
Propertyprotected\Reader  $in= ''
Details
Type
\Reader
Inherited_from
\FilterReader::$$in  
Inherited_from
\BaseFilterReader::$$in  
Inherited_from
\BaseParamFilterReader::$$in  
Propertyprotected  $initialized= 'false'
inherited

Have the parameters passed been interpreted?

Inherited from: \BaseFilterReader::$$initialized\BaseParamFilterReader::$$initialized
Default valuefalseDetails
Type
n/a
Inherited_from
\BaseFilterReader::$$initialized  
Inherited_from
\BaseParamFilterReader::$$initialized  
Propertyprotected  $project= 'null'
inherited

The Phing project this filter is part of.

Inherited from: \BaseFilterReader::$$project\BaseParamFilterReader::$$project
Default valuenullDetails
Type
n/a
Inherited_from
\BaseFilterReader::$$project  
Inherited_from
\BaseParamFilterReader::$$project  

Methods

methodpublic__construct( \Reader $in = null ) : void
inherited

Constructor used by Phing's introspection mechanism.

Inherited from: \BaseFilterReader::__construct()\BaseParamFilterReader::__construct()

The original filter reader is only used for chaining purposes, never for filtering purposes (and indeed it would be useless for filtering purposes, as it has no real data to filter). ChainedReaderHelper uses this placeholder instance to create a chain of real filters.

Parameters
Name Type Description
$in \Reader
methodprivate_initialize( ) : void

Scans the parameters list for the "lines" parameter and uses it to set the number of lines to be returned in the filtered stream.

methodpublicchain( object $reader ) : object

Creates a new TailFilter using the passed in Reader for instantiation.

Parameters
Name Type Description
$reader object

A Reader object providing the underlying stream. Must not be null.

Returns
Type Description
object A new filter based on this configuration, but filtering the specified reader.
methodpublicclose( ) : void
Throws
Exception Description
\IOException if there is an error closing stream
methodpubliceof( ) : boolean
inherited

Returns whether the end of file has been reached with input stream.

Inherited from: \BaseFilterReader::eof()\BaseParamFilterReader::eof()
Returns
Type Description
boolean
methodpublicgetInitialized( ) : boolean
inherited

Returns the initialized status.

Inherited from: \BaseFilterReader::getInitialized()\BaseParamFilterReader::getInitialized()
Returns
Type Description
boolean whether or not the filter is initialized
methodpublicgetLines( ) : integer

Returns the number of lines to be returned in the filtered stream.

Returns
Type Description
integer The number of lines to be returned in the filtered stream.
methodpublicgetParameters( ) : void
inherited

Inherited from: \BaseParamFilterReader::getParameters()
methodpublicgetProject( ) : object
inherited

Returns the project this filter is part of.

Inherited from: \BaseFilterReader::getProject()\BaseParamFilterReader::getProject()
Returns
Type Description
object The project this filter is part of
methodpublicgetResource( ) : string
inherited

Returns the filename, url, etc. that is being read from.

Inherited from: \FilterReader::getResource()\BaseFilterReader::getResource()\BaseParamFilterReader::getResource()

This is critical for, e.g., ExpatParser's ability to know the filename that is throwing an ExpatParserException, etc.

Returns
Type Description
string
methodpubliclog( string $msg, int $level = Project::MSG_INFO ) : void
inherited

Convenience method to support logging in filters.

Inherited from: \BaseFilterReader::log()\BaseParamFilterReader::log()
Parameters
Name Type Description
$msg string

Message to log.

$level int

Priority level.

methodpublicmark( ) : void
inherited

If supported, places a "marker" (like a bookmark) at current stream position.

Inherited from: \Reader::mark()\FilterReader::mark()\BaseFilterReader::mark()\BaseParamFilterReader::mark()

A subsequent call to reset() will move stream position back to last marker (if supported).

methodpublicmarkSupported( ) : boolean
Returns
Type Description
boolean
methodpublicread( int $len = null ) : mixed

Returns the last n lines of a file.

FIXME: Clean up this function signature, as it a) params aren't being used and b) it doesn't make much sense.

Parameters
Name Type Description
$len int

Num chars to read.

Returns
Type Description
mixed The filtered buffer or -1 if EOF.
Throws
Exception Description
\IOException If an I/O error occurs
methodpublicreadLine( ) : \the
inherited

Reads a line of text ending with '\n' (or until the end of the stream).

Inherited from: \BaseFilterReader::readLine()\BaseParamFilterReader::readLine()

The returned String retains the '\n'.

Returns
Type Description
\the line read, or <code>null</code> if the end of the stream has already been reached
Throws
Exception Description
\IOException if the underlying reader throws one during reading
methodpublicready( ) : boolean
Returns
Type Description
boolean
methodpublicreset( ) : void
inherited

Reset the current position in stream to beginning or last mark (if supported).

Inherited from: \FilterReader::reset()\BaseFilterReader::reset()\BaseParamFilterReader::reset()
methodpublicsetInitialized( boolean $initialized ) : void
inherited

Sets the initialized status.

Inherited from: \BaseFilterReader::setInitialized()\BaseParamFilterReader::setInitialized()
Parameters
Name Type Description
$initialized boolean

Whether or not the filter is initialized.

methodpublicsetLines( integer $lines ) : void

Sets the number of lines to be returned in the filtered stream.

Parameters
Name Type Description
$lines integer

the number of lines to be returned in the filtered stream.

methodpublicsetParameters(  $parameters ) : void
inherited

Inherited from: \BaseParamFilterReader::setParameters()
Parameters
Name Type Description
$parameters
methodpublicsetProject( object $project ) : void
inherited

Sets the project to work with.

Inherited from: \BaseFilterReader::setProject()\BaseParamFilterReader::setProject()
Parameters
Name Type Description
$project object

The project this filter is part of. Should not be null.

methodpublicsetReader(  $in ) : void
Parameters
Name Type Description
$in
methodpublicskip( int $n ) : void
inherited

Move stream position relative to current pos.

Inherited from: \FilterReader::skip()\BaseFilterReader::skip()\BaseParamFilterReader::skip()
Parameters
Name Type Description
$n int
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