Source of file AbstractDatabase.php

<?php

/**

 * Copyright 2019 University of Liverpool

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 * http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

namespace pgb_liv\php_ms\Core\Database;

/**

 * Abstract class for database object.

 *

 * @author Andrew Collins

 */

abstract class AbstractDatabase implements DatabaseInterface

{

    private $prefix;

    private $name;

    private $source;

    /**

     *

     * @var DatabaseInterface[]

     */

    private static $instances = array();

    /**

     * Singleton use only

     */

    protected function __construct($prefix, $name)

    {

        $this->prefix = $prefix;

        $this->name = $name;

    }

    /**

     *

     * {@inheritdoc}

     */

    public function getPrefix()

    {

        return $this->prefix;

    }

    /**

     *

     * {@inheritdoc}

     */

    public function getName()

    {

        return $this->name;

    }

    protected function setSource($source)

    {

        $this->source = $source;

    }

    /**

     *

     * {@inheritdoc}

     */

    public function getSource()

    {

        return $this->source;

    }

    /**

     * Gets the singleton intance for this prefix

     *

     * @param string $prefix

     * @return DatabaseInterface

     */

    public static function getInstance()

    {

        $class = get_called_class();

        if (! isset(self::$instances[$class])) {

            self::$instances[$class] = new $class();

        }

        return self::$instances[$class];

    }

}