filters/TailFilter.php
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
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
Properties


integer
$_lines= '10'
Number of lines to be returned in the filtered stream.
10
Details- Type
- integer


$_parameters= 'array()'
array()
Details- Type
- n/a
- Inherited_from
- \BaseParamFilterReader::$$_parameters


\Reader
$in= ''
- Type
- \Reader
- Inherited_from
- \FilterReader::$$in
- Inherited_from
- \BaseFilterReader::$$in
- Inherited_from
- \BaseParamFilterReader::$$in


$initialized= 'false'
Have the parameters passed been interpreted?
Inherited from: \BaseFilterReader::$$initialized\BaseParamFilterReader::$$initializedfalse
Details- Type
- n/a
- Inherited_from
- \BaseFilterReader::$$initialized
- Inherited_from
- \BaseParamFilterReader::$$initialized


$project= 'null'
The Phing project this filter is part of.
Inherited from: \BaseFilterReader::$$project\BaseParamFilterReader::$$projectnull
Details- Type
- n/a
- Inherited_from
- \BaseFilterReader::$$project
- Inherited_from
- \BaseParamFilterReader::$$project
Methods


__construct(
\Reader $in
=
null
)
:
void
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.
Name | Type | Description |
---|---|---|
$in | \Reader |


_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.


chain(
object $reader
)
:
object
Creates a new TailFilter using the passed in Reader for instantiation.
Name | Type | Description |
---|---|---|
$reader | object | A Reader object providing the underlying stream. Must not be |
Type | Description |
---|---|
object | A new filter based on this configuration, but filtering the specified reader. |


close(
)
:
void
Close stream.
Inherited from: \FilterReader::close()\BaseFilterReader::close()\BaseParamFilterReader::close()Exception | Description |
---|---|
\IOException | if there is an error closing stream |


eof(
)
:
boolean
Returns whether the end of file has been reached with input stream.
Inherited from: \BaseFilterReader::eof()\BaseParamFilterReader::eof()Type | Description |
---|---|
boolean |


getInitialized(
)
:
boolean
Returns the initialized status.
Inherited from: \BaseFilterReader::getInitialized()\BaseParamFilterReader::getInitialized()Type | Description |
---|---|
boolean | whether or not the filter is initialized |


getLines(
)
:
integer
Returns the number of lines to be returned in the filtered stream.
Type | Description |
---|---|
integer | The number of lines to be returned in the filtered stream. |


getProject(
)
:
object
Returns the project this filter is part of.
Inherited from: \BaseFilterReader::getProject()\BaseParamFilterReader::getProject()Type | Description |
---|---|
object | The project this filter is part of |


getResource(
)
:
string
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.
Type | Description |
---|---|
string |


log(
string $msg, int $level
=
Project::MSG_INFO
)
:
void
Convenience method to support logging in filters.
Inherited from: \BaseFilterReader::log()\BaseParamFilterReader::log()Name | Type | Description |
---|---|---|
$msg | string | Message to log. |
$level | int | Priority level. |


mark(
)
:
void
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).


markSupported(
)
:
boolean
Whether marking is supported.
Inherited from: \Reader::markSupported()\FilterReader::markSupported()\BaseFilterReader::markSupported()\BaseParamFilterReader::markSupported()Type | Description |
---|---|
boolean |


read(
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.
Name | Type | Description |
---|---|---|
$len | int | Num chars to read. |
Type | Description |
---|---|
mixed | The filtered buffer or -1 if EOF. |
Exception | Description |
---|---|
\IOException | If an I/O error occurs |


readLine(
)
:
\the
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'.
Type | Description |
---|---|
\the | line read, or <code>null</code> if the end of the stream has already been reached |
Exception | Description |
---|---|
\IOException | if the underlying reader throws one during reading |


ready(
)
:
boolean
Is stream ready for reading.
Inherited from: \Reader::ready()\FilterReader::ready()\BaseFilterReader::ready()\BaseParamFilterReader::ready()Type | Description |
---|---|
boolean |


reset(
)
:
void
Reset the current position in stream to beginning or last mark (if supported).
Inherited from: \FilterReader::reset()\BaseFilterReader::reset()\BaseParamFilterReader::reset()

setInitialized(
boolean $initialized
)
:
void
Sets the initialized status.
Inherited from: \BaseFilterReader::setInitialized()\BaseParamFilterReader::setInitialized()Name | Type | Description |
---|---|---|
$initialized | boolean | Whether or not the filter is initialized. |


setLines(
integer $lines
)
:
void
Sets the number of lines to be returned in the filtered stream.
Name | Type | Description |
---|---|---|
$lines | integer | the number of lines to be returned in the filtered stream. |


setParameters(
$parameters
)
:
void
Name | Type | Description |
---|---|---|
$parameters |


setProject(
object $project
)
:
void
Sets the project to work with.
Inherited from: \BaseFilterReader::setProject()\BaseParamFilterReader::setProject()Name | Type | Description |
---|---|---|
$project | object | The project this filter is part of. Should not be |


setReader(
$in
)
:
void
Name | Type | Description |
---|---|---|
$in |


skip(
int $n
)
:
void
Move stream position relative to current pos.
Inherited from: \FilterReader::skip()\BaseFilterReader::skip()\BaseParamFilterReader::skip()Name | Type | Description |
---|---|---|
$n | int |