content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.beam.sdk.metrics;
  
  import static org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions.checkArgument;
  
  import com.google.auto.value.AutoValue;
  import com.google.auto.value.extension.memoized.Memoized;
  import java.io.Serializable;
  import java.util.Map;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Strings;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableMap;
  
  /**
   * The name of a metric consists of a {@link #getNamespace} and a {@link #getName}. The {@link
   * #getNamespace} allows grouping related metrics together and also prevents collisions between
   * multiple metrics with the same name.
   */
  @SuppressWarnings("AutoValueFinalMethods")
  @AutoValue
  public abstract class MetricName implements Serializable {
  
    /** The namespace associated with this metric. */
    public abstract String getNamespace();
  
    /** The name of this metric. */
    public abstract String getName();
  
    /** Associated labels for the metric. */
    public abstract Map<String, String> getLabels();
  
    @Override
    @Memoized
    public String toString() {
      return getNamespace() + ":" + getName();
    }
  
    public static MetricName named(String namespace, String name) {
      checkArgument(!Strings.isNullOrEmpty(namespace), "Metric namespace must be non-empty");
      checkArgument(!Strings.isNullOrEmpty(name), "Metric name must be non-empty");
      return new AutoValue_MetricName(namespace, name, ImmutableMap.of());
    }
  
    public static MetricName named(String namespace, String name, Map<String, String> labels) {
      checkArgument(!Strings.isNullOrEmpty(namespace), "Metric namespace must be non-empty");
      checkArgument(!Strings.isNullOrEmpty(name), "Metric name must be non-empty");
      return new AutoValue_MetricName(namespace, name, ImmutableMap.copyOf(labels));
    }
  
    public static MetricName named(Class<?> namespace, String name) {
      checkArgument(namespace != null, "Metric namespace must be non-null");
      checkArgument(!Strings.isNullOrEmpty(name), "Metric name must be non-empty");
      return new AutoValue_MetricName(namespace.getName(), name, ImmutableMap.of());
    }
  
    public static MetricName named(Class<?> namespace, String name, Map<String, String> labels) {
      checkArgument(namespace != null, "Metric namespace must be non-null");
      checkArgument(!Strings.isNullOrEmpty(name), "Metric name must be non-empty");
      return new AutoValue_MetricName(namespace.getName(), name, ImmutableMap.copyOf(labels));
    }
  }
  