Renaming Namespaces and Organizing Classes

- Updated OpenId classes to be in API namespace
- Updated PP Naming Convention to PayPal Naming Convention
- FormatConverter Class got its own namespace
- Handlers are grouped in Handler namespace
- Samples and Tests Updated Accordingly

lib/PayPal/Core/PayPalLoggingManager.php

@@ -0,0 +1,145 @@
+<?php
+
+namespace PayPal\Core;
+
+/**
+ * Simple Logging Manager.
+ * This does an error_log for now
+ * Potential frameworks to use are PEAR logger, log4php from Apache
+ */
+class PayPalLoggingManager
+{
+
+    /**
+     * Default Logging Level
+     */
+    const DEFAULT_LOGGING_LEVEL = 0;
+
+    /**
+     * Logger Name
+     * @var string
+     */
+    private $loggerName;
+
+    /**
+     * Log Enabled
+     *
+     * @var bool
+     */
+    private $isLoggingEnabled;
+
+    /**
+     * Configured Logging Level
+     *
+     * @var int|mixed
+     */
+    private $loggingLevel;
+
+    /**
+     * Configured Logging File
+     *
+     * @var string
+     */
+    private $loggerFile;
+
+    /**
+     * Returns the singleton object
+     *
+     * @param string $loggerName
+     * @return $this
+     */
+    public static function getInstance($loggerName = __CLASS__)
+    {
+        $instance = new self();
+        $instance->setLoggerName($loggerName);
+        return $instance;
+    }
+
+    /**
+     * Sets Logger Name. Generally defaulted to Logging Class
+     *
+     * @param string $loggerName
+     */
+    public function setLoggerName($loggerName = __CLASS__)
+    {
+        $this->loggerName = $loggerName;
+    }
+
+    /**
+     * Default Constructor
+     */
+    public function __construct()
+    {
+        // To suppress the warning during the date() invocation in logs, we would default the timezone to GMT.
+        if (!ini_get('date.timezone')) {
+            date_default_timezone_set('GMT');
+        }
+
+        $config = PayPalConfigManager::getInstance()->getConfigHashmap();
+
+        $this->isLoggingEnabled = (array_key_exists('log.LogEnabled', $config) && $config['log.LogEnabled'] == '1');
+
+        if ($this->isLoggingEnabled) {
+            $this->loggerFile = ($config['log.FileName']) ? $config['log.FileName'] : ini_get('error_log');
+            $loggingLevel = strtoupper($config['log.LogLevel']);
+            $this->loggingLevel =
+                (isset($loggingLevel) && defined(__NAMESPACE__ . "\\PayPalLoggingLevel::$loggingLevel")) ?
+                constant(__NAMESPACE__ . "\\PayPalLoggingLevel::$loggingLevel") :
+                PayPalLoggingManager::DEFAULT_LOGGING_LEVEL;
+        }
+    }
+
+    /**
+     * Default Logger
+     *
+     * @param string $message
+     * @param int $level
+     */
+    private function log($message, $level = PayPalLoggingLevel::INFO)
+    {
+        if ($this->isLoggingEnabled && ($level <= $this->loggingLevel)) {
+            error_log("[" .  date('d-m-Y h:i:s') . "] " . $this->loggerName . ": $message\n", 3, $this->loggerFile);
+        }
+    }
+
+    /**
+     * Log Error
+     *
+     * @param string $message
+     */
+    public function error($message)
+    {
+        $this->log('ERROR: ' . $message, PayPalLoggingLevel::ERROR);
+    }
+
+    /**
+     * Log Warning
+     *
+     * @param string $message
+     */
+    public function warning($message)
+    {
+        $this->log('WARNING: ' . $message, PayPalLoggingLevel::WARN);
+    }
+
+    /**
+     * Log Info
+     *
+     * @param string $message
+     */
+    public function info($message)
+    {
+        $this->log('INFO: ' . $message, PayPalLoggingLevel::INFO);
+    }
+
+    /**
+     * Log Fine
+     *
+     * @param string $message
+     */
+    public function fine($message)
+    {
+        $this->log('FINE: ' . $message, PayPalLoggingLevel::FINE);
+    }
+
+}