Extending ONC validator's logging. Completing toplevel validation.

chromeos/network/onc/onc_mapper.h

 // Copyright (c) 2012 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 CHROMEOS_NETWORK_ONC_ONC_MAPPER_H_
 #define CHROMEOS_NETWORK_ONC_ONC_MAPPER_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "chromeos/chromeos_export.h"
 
 namespace base {
-class Value;
 class DictionaryValue;
 class ListValue;
+class Value;
 }
 
 namespace chromeos {
 namespace onc {
 
 struct OncValueSignature;
 
 // This class implements a DeepCopy of base::Values for ONC objects that
 // iterates over both the ONC signature and the object hierarchy. DCHECKs if a
 // field signature without value signature or an array signature without entry
 // signature is reached.
 //
 // The general term "map" is used here, as this class is meant as base class and
 // the copy behavior can be adapted by overriding the methods. By comparing the
 // address of a signature object to the list of signatures in "onc_signature.h",
 // accurate signature-specific translations or validations can be applied in the
 // overriding methods.
 //
 // The ONC validator and normalizer derive from this class and adapt the default
 // copy behavior.
 class Mapper {
  public:
   Mapper();
   virtual ~Mapper();
 
  protected:
   // Calls |MapObject|, |MapArray| and |MapPrimitive| according to |onc_value|'s
-  // type. By default aborts on nested errors in arrays. Result of the mapping
-  // is returned. On error returns NULL.
-  virtual scoped_ptr<base::Value> MapValue(
-    const OncValueSignature& signature,
-    const base::Value& onc_value);
+  // type, which always return an object of the according type. Result of the
+  // mapping is returned. On error sets |error| to true.
+  virtual scoped_ptr<base::Value> MapValue(const OncValueSignature& signature,
+                                           const base::Value& onc_value,
+                                           bool* error);
 
   // Maps objects/dictionaries. By default calls |MapFields|, which recurses
-  // into each field of |onc_object|, and aborts on unknown fields. Result of
-  // the mapping is returned. On error returns NULL.
+  // into each field of |onc_object|, and drops unknown fields. Result of the
+  // mapping is returned. On error sets |error| to true. In this implementation
+  // only unknown fields are errors.
   virtual scoped_ptr<base::DictionaryValue> MapObject(
       const OncValueSignature& signature,
-      const base::DictionaryValue& onc_object);
+      const base::DictionaryValue& onc_object,
+      bool* error);
 
   // Maps primitive values like BinaryValue, StringValue, IntegerValue... (all
   // but dictionaries and lists). By default copies |onc_primitive|. Result of
-  // the mapping is returned. On error returns NULL.
+  // the mapping is returned. On error sets |error| to true.
   virtual scoped_ptr<base::Value> MapPrimitive(
-    const OncValueSignature& signature,
-    const base::Value& onc_primitive);
+      const OncValueSignature& signature,
+      const base::Value& onc_primitive,
+      bool* error);
 
-  // Maps each field of the given |onc_object| according to
-  // |object_signature|. Adds the mapping of each field to |result| using
-  // |MapField| and drops unknown fields by default. Sets
-  // |found_unknown_field| to true if this dictionary contains any unknown
-  // fields. Set |nested_error_occured| to true if nested errors occured.
-  virtual void MapFields(
-      const OncValueSignature& object_signature,
-      const base::DictionaryValue& onc_object,
-      bool* found_unknown_field,
-      bool* nested_error_occured,
-      base::DictionaryValue* result);
+  // Maps each field of the given |onc_object| according to |object_signature|.
+  // Adds the mapping of each field to |result| using |MapField| and drops
+  // unknown fields by default. Sets |found_unknown_field| to true if this
+  // dictionary contains any unknown fields. Set |nested_error| to true if
+  // nested errors occured.
+  virtual void MapFields(const OncValueSignature& object_signature,
+                         const base::DictionaryValue& onc_object,
+                         bool* found_unknown_field,
+                         bool* nested_error,
+                         base::DictionaryValue* result);
 
   // Maps the value |onc_value| of field |field_name| according to its field
   // signature in |object_signature| using |MapValue|. Sets
-  // |found_unknown_field| to true if |field_name| cannot be found in
-  // |object_signature|, which by default is an error. Result of the mapping is
-  // returned. On error returns NULL.
+  // |found_unknown_field| to true and returns NULL if |field_name| cannot be
+  // found in |object_signature|. Otherwise returns the mapping of |onc_value|.
   virtual scoped_ptr<base::Value> MapField(
       const std::string& field_name,
       const OncValueSignature& object_signature,
       const base::Value& onc_value,
-      bool* found_unknown_field);
+      bool* found_unknown_field,
+      bool* error);
 
   // Maps the array |onc_array| according to |array_signature|, which defines
   // the type of the entries. Maps each entry by calling |MapValue|. If any of
-  // the nested mappings failed, the flag |nested_error_occured| is set to true
-  // and the entry is dropped from the result. The resulting array is
-  // returned. On error returns NULL.
+  // the nested mappings failed, the flag |nested_error| is set to true and the
+  // entry is dropped from the result. The resulting array is returned.
   virtual scoped_ptr<base::ListValue> MapArray(
       const OncValueSignature& array_signature,
       const base::ListValue& onc_array,
-      bool* nested_error_occured);
+      bool* nested_error);
+
+  // Calls |MapValue| and returns its result. Called by |MapArray| for each
+  // entry and its index in the enclosing array.
+  virtual scoped_ptr<base::Value> MapEntry(int index,
+                                           const OncValueSignature& signature,
+                                           const base::Value& onc_value,
+                                           bool* error);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Mapper);
 };
 
 }  // namespace onc
 }  // namespace chromeos
 
 #endif  // CHROMEOS_NETWORK_ONC_ONC_MAPPER_H_