| /** |
| * 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.hadoop.metrics2; |
| |
| /** |
| * Immutable tag for metrics (for grouping on host/queue/username etc.) |
| */ |
| public class MetricsTag { |
| |
| private final String name; |
| private final String description; |
| private final String value; |
| |
| /** |
| * Construct the tag with name, description and value |
| * @param name of the tag |
| * @param description of the tag |
| * @param value of the tag |
| */ |
| public MetricsTag(String name, String description, String value) { |
| this.name = name; |
| this.description = description; |
| this.value = value; |
| } |
| |
| /** |
| * Get the name of the tag |
| * @return the name |
| */ |
| public String name() { |
| return name; |
| } |
| |
| /** |
| * Get the description of the tag |
| * @return the description |
| */ |
| public String description() { |
| return description; |
| } |
| |
| /** |
| * Get the value of the tag |
| * @return the value |
| */ |
| public String value() { |
| return value; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj == null) { |
| return false; |
| } |
| if (getClass() != obj.getClass()) { |
| return false; |
| } |
| final MetricsTag other = (MetricsTag) obj; |
| if (!this.name.equals(other.name())) { |
| return false; |
| } |
| if (!this.description.equals(other.description())) { |
| return false; |
| } |
| if (this.value == null || other.value() == null) { |
| if (this.value == null && other.value() == null) return true; |
| return false; |
| } |
| if (!this.value.equals(other.value())) { |
| return false; |
| } |
| return true; |
| } |
| |
| @Override |
| public int hashCode() { |
| return name.hashCode() ^ (value == null ? 0 : value.hashCode()); |
| } |
| |
| @Override |
| public String toString() { |
| return "MetricsTag{" + "name='" + name + "' description='" + description + |
| "' value='" + value + "'}"; |
| } |
| |
| } |