code: /*
   * 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.skywalking.oap.server.library.util.prometheus.parser.sample;
  
  import java.util.Map;
  import lombok.AccessLevel;
  import lombok.Getter;
  import lombok.RequiredArgsConstructor;
  
  @RequiredArgsConstructor(access = AccessLevel.PRIVATE)
  @Getter
  public class TextSample {
  
      private final String name;
      private final Map<String, String> labels;
      private final String value;
      private final String line;
  
      public static TextSample parse(String line) {
          Context ctx = new Context();
          State state = State.NAME;
          for (int c = 0; c < line.length(); c++) {
              char charAt = line.charAt(c);
              state = state.nextState(charAt, ctx);
              if (state == State.INVALID) {
                  throw new IllegalStateException(String.format("At offset %d, character is %c", c, charAt));
              } else if (state == State.END) {
                  break;
              }
          }
          return new TextSample(ctx.name.toString(), ctx.labels, ctx.value.toString(), line);
      }
  }