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diff --git a/o3d/core/cross/error_status.h b/o3d/core/cross/error_status.h
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+/*
+ * Copyright 2009, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+#ifndef O3D_CORE_CROSS_ERROR_STATUS_H_
+#define O3D_CORE_CROSS_ERROR_STATUS_H_
+
+#include "core/cross/service_implementation.h"
+#include "core/cross/service_dependency.h"
+#include "core/cross/ierror_status.h"
+
+namespace o3d {
+
+// Records the last reported error. Allows a callback to be invoked when an
+// error is reported.
+class ErrorStatus : public IErrorStatus {
+ public:
+  explicit ErrorStatus(ServiceLocator* service_locator_);
+
+  // Sets the error callback. NOTE: The client takes ownership of the
+  // ErrorCallback you pass in. It will be deleted if you call SetErrorCallback
+  // a second time or if you call ClearErrorCallback.
+  //
+  // Parameters:
+  //   error_callback: ErrorCallback to call each time the client gets
+  //       an error.
+  void SetErrorCallback(ErrorCallback* error_callback);
+
+  // Clears the Error callback NOTE: The client takes ownership of the
+  // ErrorCallback you pass in to SetErrorCallback. It will be deleted if you
+  // call SetErrorCallback a second time or if you call ClearErrorCallback.
+  virtual void ClearErrorCallback();
+
+  // Sets the last error. This is pretty much only called by ErrorStreamManager.
+  virtual void SetLastError(const String& error);
+
+#ifndef NDEBUG
+  // For debug builds, we display where in the code the error came from.
+  virtual void SetLastError(const String& error, const char *file, int line);
+#endif
+
+  // Gets the last reported error.
+  virtual const String& GetLastError() const;
+
+  // Clears the stored last error.
+  virtual void ClearLastError();
+
+  // File logging is only ever done in a debug build.
+  void SetFileLoggingActive(bool should_log) {
+    log_to_file_ = should_log;
+  }
+  bool IsFileLoggingActive() const {
+    return log_to_file_;
+  }
+
+ protected:
+  // Exchanges a new callback with the current callback, returing the old
+  // one.
+  // Parameters:
+  //   callback: ErrorCallback to exchange.
+  virtual ErrorCallback* Exchange(ErrorCallback* callback);
+
+ private:
+  typedef NonRecursiveCallback1Manager<const o3d::String&>
+      ErrorCallbackManager;
+
+  ServiceImplementation<IErrorStatus> service_;
+  ErrorCallbackManager error_callback_manager_;
+  String error_string_;
+  bool log_to_file_;
+};
+
+// This class temporarily replaces the error callback on the ErrorStatus
+// service. It restores it when destroyed.
+// It should be used like this.
+//
+// { // some scope
+//   ErrorCollector error_collector(service_locator);
+//
+//   .. call some stuff that might generate an error.
+//
+//   String errors = error_collector.errors();
+//
+// }  // end of scope, old callback has been restored.
+class ErrorCollector : public IErrorStatus::ErrorCallback {
+ public:
+  explicit ErrorCollector(ServiceLocator* service_locator);
+  ~ErrorCollector();
+
+  // Appends the error to the errors being collected.
+  virtual void Run(const String& error);
+
+  // Gets the collectd errors.
+  const String& errors() const {
+    return errors_;
+  }
+
+ private:
+  IErrorStatus* error_status_;
+  IErrorStatus::ErrorCallback* old_callback_;
+  String errors_;
+
+  DISALLOW_COPY_AND_ASSIGN(ErrorCollector);
+};
+
+// This class temporarily replaces the error callback on the ErrorStatus
+// service. It restores it when destroyed.  It's similar to the ErrorCollector,
+// but it throws away all errors instead of collecting them.  It also suppresses
+// debugging log output temporarily.
+//
+// It should be used like this.
+//
+// { // some scope
+//   ErrorSuppressor error_suppressor(service_locator);
+//
+//   .. call some stuff that might generate an error.
+//
+// }  // end of scope, old callback has been restored.
+class ErrorSuppressor : public IErrorStatus::ErrorCallback {
+ public:
+  explicit ErrorSuppressor(ServiceLocator* service_locator);
+  ~ErrorSuppressor();
+
+  virtual void Run(const String& error) {}
+
+ private:
+  IErrorStatus* error_status_;
+  IErrorStatus::ErrorCallback* old_callback_;
+  bool old_file_logging_;
+
+  DISALLOW_COPY_AND_ASSIGN(ErrorSuppressor);
+};
+
+}  // namespace o3d
+
+#endif  // O3D_CORE_CROSS_ERROR_STATUS_H_