Added a SchemaMap.

chrome/browser/policy/schema_map.h

Index: chrome/browser/policy/schema_map.h
diff --git a/chrome/browser/policy/schema_map.h b/chrome/browser/policy/schema_map.h
new file mode 100644
index 0000000000000000000000000000000000000000..44e9c6c6c09c6f97ef27405561992e0e4cfe6a4b
--- /dev/null
+++ b/chrome/browser/policy/schema_map.h
@@ -0,0 +1,56 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_POLICY_SCHEMA_MAP_H_
+#define CHROME_BROWSER_POLICY_SCHEMA_MAP_H_
+
+#include <map>
+#include <string>
+
+#include "base/memory/ref_counted.h"
+#include "components/policy/core/common/policy_namespace.h"
+
+namespace policy {
+
+class PolicyBundle;
+class Schema;
+
+typedef std::map<std::string, Schema> ComponentMap;

[bartfab (slow), 2013/10/30 12:34:49]

Is a forward-declaration of Schema really sufficient for a map typedef?

[Joao da Silva, 2013/10/31 13:34:56]

It is, but this could be confusing for users of this header. Done.

+typedef std::map<PolicyDomain, ComponentMap> DomainMap;
+
+// Contains a mapping of policy namespaces (domain + component ID) to its
+// corresponding Schema.
+class SchemaMap : public base::RefCountedThreadSafe<SchemaMap> {
+ public:
+  SchemaMap();
+  // Takes ownership of |map| (its contents will be swapped).
+  explicit SchemaMap(DomainMap& map);
+
+  const DomainMap& GetDomains() const;
+
+  const ComponentMap& GetComponents(PolicyDomain domain) const;

[bartfab (slow), 2013/10/30 12:34:49]

Could this return a pointer instead, eliminating the need for 
kEmptyComponentMap_?

[Joao da Silva, 2013/10/31 13:34:56]

Done.

+
+  const Schema* GetSchema(PolicyDomain domain,

[bartfab (slow), 2013/10/30 12:34:49]

Why this accessor? Would it not be cleaner to have all callers construct a
PolicyNamespace when they want to get a schema?

[Joao da Silva, 2013/10/31 13:34:56]

Done.

+                          const std::string& component_id) const;
+
+  const Schema* GetSchema(const PolicyNamespace& ns) const;
+
+  // Removes all the policies in |bundle| that don't match the known schemas.
+  // Unknown components are also dropped.
+  void FilterBundle(PolicyBundle* bundle) const;
+
+ private:
+  friend class base::RefCountedThreadSafe<SchemaMap>;
+
+  ~SchemaMap();
+
+  DomainMap map_;
+  const ComponentMap kEmptyComponentMap_;
+
+  DISALLOW_COPY_AND_ASSIGN(SchemaMap);

[bartfab (slow), 2013/10/30 12:34:49]

#include "base/basictypes.h"

[Joao da Silva, 2013/10/31 13:34:56]

Done.

+};
+
+}  // namespace policy
+
+#endif  // CHROME_BROWSER_POLICY_SCHEMA_MAP_H_