add basic arch linux support

manifests/config.pp

@@ -62,6 +62,15 @@ class java::config ( ) {
         }
       }
     }
+    'Archlinux': {
+      if $java::use_java_home != undef {
+        file_line { 'java-home-environment':
+          path  => '/etc/profile',
+          line  => "JAVA_HOME=${$java::use_java_home}",
+          match => 'JAVA_HOME=',
+        }
+      }
+    }
     default: {
       # Do nothing.
     }

manifests/params.pp

@@ -253,6 +253,21 @@ class java::params {
         },
       }
     }
+    'Archlinux': {
+      $jdk_package = 'jdk8-openjdk'
+      $jre_package = 'jre8-openjdk'
+      $java_home   = '/usr/lib/jvm/java-8-openjdk/jre/'
+      $java = {
+        'jdk' => {
+          'package'   => $jdk_package,
+          'java_home' => $java_home,
+        },
+        'jre' => {
+          'package'   => $jre_package,
+          'java_home' => $java_home,
+        },
+      }
+    }
     default: { fail("unsupported platform ${::osfamily}") }
   }
 }