1 files changed, 113 insertions, 0 deletions
diff --git a/library/Director/Application/Dependency.php b/library/Director/Application/Dependency.php
new file mode 100644
index 0000000..0100e69
--- /dev/null
+++ b/library/Director/Application/Dependency.php
@@ -0,0 +1,113 @@
+<?php
+
+namespace Icinga\Module\Director\Application;
+
+class Dependency
+{
+    /** @var string */
+    protected $name;
+
+    /** @var string|null */
+    protected $installedVersion;
+
+    /** @var bool|null */
+    protected $enabled;
+
+    /** @var string */
+    protected $operator;
+
+    /** @var string */
+    protected $requiredVersion;
+
+    /** @var string */
+    protected $requirement;
+
+    /**
+     * Dependency constructor.
+     * @param string $name         Usually a module name
+     * @param string $requirement  e.g. >=1.7.0
+     * @param string $installedVersion
+     * @param bool $enabled
+     */
+    public function __construct($name, $requirement, $installedVersion = null, $enabled = null)
+    {
+        $this->name = $name;
+        $this->setRequirement($requirement);
+        if ($installedVersion !== null) {
+            $this->setInstalledVersion($installedVersion);
+        }
+        if ($enabled !== null) {
+            $this->setEnabled($enabled);
+        }
+    }
+
+    public function setRequirement($requirement)
+    {
+        if (preg_match('/^([<>=]+)\s*v?(\d+\.\d+\.\d+)$/', $requirement, $match)) {
+            $this->operator = $match[1];
+            $this->requiredVersion = $match[2];
+            $this->requirement = $requirement;
+        } else {
+            throw new \InvalidArgumentException("'$requirement' is not a valid version constraint");
+        }
+    }
+
+    /**
+     * @return bool
+     */
+    public function isInstalled()
+    {
+        return $this->installedVersion !== null;
+    }
+
+    /**
+     * @return string|null
+     */
+    public function getInstalledVersion()
+    {
+        return $this->installedVersion;
+    }
+
+    /**
+     * @param string $version
+     */
+    public function setInstalledVersion($version)
+    {
+        $this->installedVersion = ltrim($version, 'v'); // v0.6.0 VS 0.6.0
+    }
+
+    /**
+     * @return bool
+     */
+    public function isEnabled()
+    {
+        return $this->enabled === true;
+    }
+
+    /**
+     * @param bool $enabled
+     */
+    public function setEnabled($enabled = true)
+    {
+        $this->enabled = $enabled;
+    }
+
+    public function isSatisfied()
+    {
+        if (! $this->isInstalled() || ! $this->isEnabled()) {
+            return false;
+        }
+
+        return version_compare($this->installedVersion, $this->requiredVersion, $this->operator);
+    }
+
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    public function getRequirement()
+    {
+        return $this->requirement;
+    }
+}