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.calcite.avatica.remote;
  
  import com.fasterxml.jackson.core.JsonParser;
  import com.fasterxml.jackson.databind.DeserializationFeature;
  import com.fasterxml.jackson.databind.ObjectMapper;
  
  import java.io.IOException;
  import java.io.StringWriter;
  
  /**
   * Implementation of {@link org.apache.calcite.avatica.remote.Service}
   * that encodes requests and responses as JSON.
   */
  public abstract class JsonService extends AbstractService {
    public static final ObjectMapper MAPPER;
    static {
      MAPPER = new ObjectMapper();
      MAPPER.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
      MAPPER.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
      MAPPER.configure(DeserializationFeature.USE_BIG_DECIMAL_FOR_FLOATS, true);
    }
  
    public JsonService() {
    }
  
    /** Derived class should implement this method to transport requests and
     * responses to and from the peer service. */
    public abstract String apply(String request);
  
    @Override SerializationType getSerializationType() {
      return SerializationType.JSON;
    }
  
    //@VisibleForTesting
    protected static <T> T decode(String response, Class<T> expectedType)
        throws IOException {
      Response resp = MAPPER.readValue(response, Response.class);
      if (resp instanceof ErrorResponse) {
        throw ((ErrorResponse) resp).toException();
      } else if (!expectedType.isAssignableFrom(resp.getClass())) {
        throw new ClassCastException("Cannot cast " + resp.getClass() + " into " + expectedType);
      }
  
      return expectedType.cast(resp);
    }
  
    //@VisibleForTesting
    protected static <T> String encode(T request) throws IOException {
      final StringWriter w = new StringWriter();
      MAPPER.writeValue(w, request);
      return w.toString();
    }
  
    protected RuntimeException handle(IOException e) {
      return new RuntimeException(e);
    }
  
    public ResultSetResponse apply(CatalogsRequest request) {
      try {
        return finagle(decode(apply(encode(request)), ResultSetResponse.class));
      } catch (IOException e) {
        throw handle(e);
      }
    }
  
    public ResultSetResponse apply(SchemasRequest request) {
      try {
        return finagle(decode(apply(encode(request)), ResultSetResponse.class));
      } catch (IOException e) {
        throw handle(e);
      }
    }
  
    public ResultSetResponse apply(TablesRequest request) {
      try {
        return finagle(decode(apply(encode(request)), ResultSetResponse.class));
      } catch (IOException e) {
        throw handle(e);
      }
    }
  
    public ResultSetResponse apply(TableTypesRequest request) {
      try {
        return finagle(decode(apply(encode(request)), ResultSetResponse.class));
      } catch (IOException e) {
        throw handle(e);
      }
    }
  
    public ResultSetResponse apply(TypeInfoRequest request) {
      try {
        return finagle(decode(apply(encode(request)), ResultSetResponse.class));
      } catch (IOException e) {
        throw handle(e);
      }
    }
  
    public ResultSetResponse apply(ColumnsRequest request) {
      try {
        return finagle(decode(apply(encode(request)), ResultSetResponse.class));
      } catch (IOException e) {
        throw handle(e);
      }
    }
  
    public PrepareResponse apply(PrepareRequest request) {
      try {
        return finagle(decode(apply(encode(request)), PrepareResponse.class));
      } catch (IOException e) {
        throw handle(e);
      }
    }
  
    public ExecuteResponse apply(PrepareAndExecuteRequest request) {
      try {
        return finagle(decode(apply(encode(request)), ExecuteResponse.class));
      } catch (IOException e) {
        throw handle(e);
      }
    }
  
    public FetchResponse apply(FetchRequest request) {
      try {
        return decode(apply(encode(request)), FetchResponse.class);
      } catch (IOException e) {
        throw handle(e);
      }
    }
  
    public ExecuteResponse apply(ExecuteRequest request) {
      try {
        return finagle(decode(apply(encode(request)), ExecuteResponse.class));
      } catch (IOException e) {
        throw handle(e);
      }
    }
  
    public CreateStatementResponse apply(CreateStatementRequest request) {
      try {
        return decode(apply(encode(request)), CreateStatementResponse.class);
      } catch (IOException e) {
        throw handle(e);
      }
    }
  
    public CloseStatementResponse apply(CloseStatementRequest request) {
      try {
        return decode(apply(encode(request)), CloseStatementResponse.class);
      } catch (IOException e) {
        throw handle(e);
      }
    }
  
    public OpenConnectionResponse apply(OpenConnectionRequest request) {
      try {
        return decode(apply(encode(request)), OpenConnectionResponse.class);
      } catch (IOException e) {
        throw handle(e);
      }
    }
  
    public CloseConnectionResponse apply(CloseConnectionRequest request) {
      try {
        return decode(apply(encode(request)), CloseConnectionResponse.class);
      } catch (IOException e) {
        throw handle(e);
      }
    }
  
    public ConnectionSyncResponse apply(ConnectionSyncRequest request) {
      try {
        return decode(apply(encode(request)), ConnectionSyncResponse.class);
      } catch (IOException e) {
        throw handle(e);
      }
    }
  
    public DatabasePropertyResponse apply(DatabasePropertyRequest request) {
      try {
        return decode(apply(encode(request)), DatabasePropertyResponse.class);
      } catch (IOException e) {
        throw handle(e);
      }
    }
  
    public SyncResultsResponse apply(SyncResultsRequest request) {
      try {
        return decode(apply(encode(request)), SyncResultsResponse.class);
      } catch (IOException e) {
        throw handle(e);
      }
    }
  
    public CommitResponse apply(CommitRequest request) {
      try {
        return decode(apply(encode(request)), CommitResponse.class);
      } catch (IOException e) {
        throw handle(e);
      }
    }
  
    public RollbackResponse apply(RollbackRequest request) {
      try {
        return decode(apply(encode(request)), RollbackResponse.class);
      } catch (IOException e) {
        throw handle(e);
      }
    }
  
    public ExecuteBatchResponse apply(PrepareAndExecuteBatchRequest request) {
      try {
        return decode(apply(encode(request)), ExecuteBatchResponse.class);
      } catch (IOException e) {
        throw handle(e);
      }
    }
  
    public ExecuteBatchResponse apply(ExecuteBatchRequest request) {
      try {
        return decode(apply(encode(request)), ExecuteBatchResponse.class);
      } catch (IOException e) {
        throw handle(e);
      }
    }
  }
  
  // End JsonService.java
  