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// Copyright 2016 Google Inc. 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.

package com.google.cloud.trace.apachehttp;

import com.google.cloud.trace.core.Labels;
import org.apache.http.Header;

class TraceInterceptorUtil {
  static final String TRACE_CONTEXT_KEY = "TRACE-CONTEXT";

  static void annotateFromHeader(Labels.Builder labels, String key, Header header) {
    if (header != null) {
      String headerValue = header.getValue();
      if (headerValue != null && headerValue.length() > 0) {
        labels.add(key, header.getValue());
      }
    }
  }

  static void annotateIfNotEmpty(Labels.Builder labels, String key, String value) {
    if (value != null && value.length() > 0) {
      labels.add(key, value);
    }
  }
}