1 files changed, 91 insertions, 0 deletions
diff --git a/src/main/cpp/util/logging.cc b/src/main/cpp/util/logging.cc
new file mode 100644
index 0000000000..7d0bd0bfd0
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+++ b/src/main/cpp/util/logging.cc
@@ -0,0 +1,91 @@
+// Copyright 2016 The Bazel Authors. All rights reserved.
+//
+// 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.
+
+// This file is based off the logging work by the protobuf team
+#include "src/main/cpp/util/logging.h"
+
+#include <cstdio>
+#include <cstdlib>
+#include <iostream>
+#include <memory>
+
+namespace blaze_util {
+
+const char* LogLevelName(LogLevel level) {
+  static const char* level_names[] = {"INFO", "WARNING", "ERROR", "FATAL"};
+  BAZEL_CHECK(static_cast<int>(level) < 4)
+      << "LogLevelName: level out of range, there are only 4 levels.";
+  return level_names[level];
+}
+
+namespace internal {
+
+static std::unique_ptr<LogHandler> log_handler_(nullptr);
+
+LogMessage::LogMessage(LogLevel level, const std::string& filename, int line)
+    : level_(level), filename_(filename), line_(line) {}
+
+#undef DECLARE_STREAM_OPERATOR
+#define DECLARE_STREAM_OPERATOR(TYPE)              \
+  LogMessage& LogMessage::operator<<(TYPE value) { \
+    message_ << value;                             \
+    return *this;                                  \
+  }
+
+DECLARE_STREAM_OPERATOR(const std::string&)
+DECLARE_STREAM_OPERATOR(const char*)
+DECLARE_STREAM_OPERATOR(char)
+DECLARE_STREAM_OPERATOR(bool)
+DECLARE_STREAM_OPERATOR(short)
+DECLARE_STREAM_OPERATOR(int)
+DECLARE_STREAM_OPERATOR(unsigned int)
+DECLARE_STREAM_OPERATOR(long)
+DECLARE_STREAM_OPERATOR(unsigned long)
+DECLARE_STREAM_OPERATOR(long long)
+DECLARE_STREAM_OPERATOR(unsigned long long)
+DECLARE_STREAM_OPERATOR(float)
+DECLARE_STREAM_OPERATOR(double)
+DECLARE_STREAM_OPERATOR(long double)
+DECLARE_STREAM_OPERATOR(void*)
+#undef DECLARE_STREAM_OPERATOR
+
+void LogMessage::Finish() {
+  std::string message(message_.str());
+  if (log_handler_ != nullptr) {
+    log_handler_->HandleMessage(level_, filename_, line_, message);
+  } else if (level_ == LOGLEVEL_FATAL) {
+    // Expect the log_handler_ to handle FATAL calls, but we should still fail
+    // as expected even if no log_handler_ is defined. For ease of debugging,
+    // we also print out the error statement.
+    std::cerr << filename_ << ":" << line_ << " FATAL: " << message
+              << std::endl;
+    std::abort();
+  }
+}
+
+void LogFinisher::operator=(LogMessage& other) { other.Finish(); }
+
+}  // namespace internal
+
+void SetLogHandler(std::unique_ptr<LogHandler> new_handler) {
+  internal::log_handler_ = std::move(new_handler);
+}
+
+void SetLogfileDirectory(const std::string& output_dir) {
+  if (internal::log_handler_ != nullptr) {
+    internal::log_handler_->SetOutputDir(output_dir);
+  }
+}
+
+}  // namespace blaze_util