content: /*
   * Copyright © 2018-2025 Commonwealth Scientific and Industrial Research
   * Organisation (CSIRO) ABN 41 687 119 230.
   *
   * 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 au.csiro.pathling.views;
  
  import com.google.gson.JsonElement;
  import com.google.gson.JsonParseException;
  import com.google.gson.TypeAdapter;
  import com.google.gson.internal.Streams;
  import com.google.gson.stream.JsonReader;
  import com.google.gson.stream.JsonWriter;
  import java.io.IOException;
  
  /**
   * This is a factory to create an adapter that is used to serialize strings, but throw an error if a
   * non-string is encountered.
   *
   * @author John Grimes
   */
  public class StrictStringTypeAdapter extends TypeAdapter<String> {
  
    @Override
    public void write(final JsonWriter out, final String value) throws IOException {
      throw new UnsupportedOperationException("This adapter does not support writing");
    }
  
    @Override
    public String read(final JsonReader in) throws IOException {
      final JsonElement jsonElement = Streams.parse(in);
      if (!jsonElement.isJsonPrimitive() || !jsonElement.getAsJsonPrimitive().isString()) {
        throw new JsonParseException(
            "Expected a string but got something else: " + jsonElement.getAsString());
      }
      return jsonElement.getAsString();
    }
  }
  