Sanitize PrefStore interface.

chrome/browser/prefs/pref_value_map.cc

+// Copyright (c) 2010 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.
+
+#include "chrome/browser/prefs/pref_value_map.h"
+
+#include "base/logging.h"
+#include "base/scoped_ptr.h"
+#include "base/stl_util-inl.h"
+#include "base/values.h"
+
+PrefValueMap::~PrefValueMap() {
+  Clear();
+}
+
+bool PrefValueMap::GetValue(const std::string& key, Value** value) const {
+  const Map::const_iterator entry = prefs_.find(key);
+  if (entry != prefs_.end()) {
+    if (value)
+      *value = entry->second;
+    return true;
+  }
+
+  return false;
+}
+
+bool PrefValueMap::SetValue(const std::string& key, Value* value) {
+  DCHECK(value);
+  scoped_ptr<Value> value_ptr(value);
+  const Map::iterator entry = prefs_.find(key);
+  if (entry != prefs_.end()) {
+    if (Value::Equals(entry->second, value))
+      return false;
+    delete entry->second;
+    entry->second = value_ptr.release();
+  } else {
+    prefs_[key] = value_ptr.release();
+  }
+
+  return true;
+}
+
+bool PrefValueMap::RemoveValue(const std::string& key) {
+  const Map::iterator entry = prefs_.find(key);
+  if (entry != prefs_.end()) {
+    delete entry->second;
+    prefs_.erase(entry);
+    return true;
+  }
+
+  return false;
+}
+
+void PrefValueMap::Clear() {
+  STLDeleteValues(&prefs_);
+  prefs_.clear();
+}