Initial sketch for provider resolver

1 files changed, 57 insertions, 0 deletions

diff --git a/lib/chef/provider_resolver.rb b/lib/chef/provider_resolver.rb
new file mode 100644
index 0000000000..91b85e3aa0
--- /dev/null
+++ b/lib/chef/provider_resolver.rb
@@ -0,0 +1,57 @@
+#
+# Author:: Richard Manyanza (<liseki@nyikacraftsmen.com>)
+# Copyright:: Copyright (c) 2014 Richard Manyanza.
+# License:: Apache License, Version 2.0
+#
+# 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.
+#
+
+class Chef
+  class ProviderResolver
+
+    attr_reader :node
+    attr_reader :providers
+
+    def initialize(node)
+      @node = node
+      @providers = []
+      @loaded = false
+    end
+
+    def load(reload = false)
+      return if loaded? && !reload
+
+      @providers = [] if reload
+
+      Chef::Provider.each do |provider|
+        @providers << provider if provider.supports_platform?(@node[:platform])
+      end
+
+      @loaded = true
+    end
+
+    def loaded?
+      !!@loaded
+    end
+
+    def resolve(resource)
+      self.load if !loaded?
+
+      providers = @providers.find_all do |provider|
+        provider.enabled?(node) && provider.implements?(resource)
+      end
+
+      resource.evaluate_providers(providers)
+    end
+  end
+end