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<?php
/*
* $Id: DataStore.php 543 2009-08-26 15:42:07Z mrook $
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This software consists of voluntary contributions made by many individuals
* and is licensed under the LGPL. For more information please see
* <http://phing.info>.
*/
require_once 'phing/system/io/PhingFile.php';
require_once 'phing/system/io/FileWriter.php';
/**
* An abstract representation of file and directory pathnames.
*
* @package phing.util
* @author Michiel Rook <mrook@php.net>
* @version $Revision: 543 $
*/
class DataStore
{
private $data = array();
private $file = null;
/**
* Constructs a new data store
*
* @param PhingFile $file object pointing to the data store on disk
*/
function __construct(PhingFile $file)
{
$this->file = $file;
if ($this->file->exists())
{
$this->read();
}
}
/**
* Destructor
*/
function __destruct()
{
$this->commit();
}
/**
* Retrieves a value from the data store
*
* @param string $key the key
*
* @return mixed the value
*/
public function get($key)
{
if (!isset($this->data[$key]))
{
return null;
}
else
{
return $this->data[$key];
}
}
/**
* Adds a value to the data store
*
* @param string $key the key
* @param mixed $value the value
* @param boolean $autocommit whether to auto-commit (write)
* the data store to disk
*
* @return none
*/
public function put($key, $value, $autocommit = false)
{
$this->data[$key] = $value;
if ($autocommit)
{
$this->commit();
}
}
/**
* Commits data store to disk
*
* @return none
*/
public function commit()
{
$this->write();
}
/**
* Internal function to read data store from file
*
* @return none
*/
private function read()
{
if (!$this->file->canRead())
{
throw new BuildException("Can't read data store from '" .
$file->getPath() . "'");
}
else
{
$serializedData = $this->file->contents();
$this->data = unserialize($serializedData);
}
}
/**
* Internal function to write data store to file
*
* @return none
*/
private function write()
{
if (!$this->file->canWrite())
{
throw new BuildException("Can't write data store to '" .
$file->getPath() . "'");
}
else
{
$serializedData = serialize($this->data);
$writer = new FileWriter($this->file);
$writer->write($serializedData);
$writer->close();
}
}
};
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