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The reactive Postgres client

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/*
 * Copyright (C) 2017 Julien Viet
 *
 * 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 io.reactiverse.pgclient.impl;

import io.reactiverse.pgclient.PgException;
import io.reactiverse.pgclient.Row;
import io.reactiverse.pgclient.impl.codec.decoder.ErrorResponse;
import io.reactiverse.pgclient.impl.codec.decoder.RowDescription;
import io.vertx.core.AsyncResult;
import io.vertx.core.Handler;

import java.util.stream.Collector;

/**
 * @author Julien Viet
 */

public abstract class QueryCommandBase extends CommandBase {

  public RowResultDecoder decoder;
  final QueryResultHandler resultHandler;
  final Collector collector;

  QueryCommandBase(Collector collector, QueryResultHandler resultHandler, Handler> handler) {
    super(handler);
    this.resultHandler = resultHandler;
    this.collector = collector;
  }

  abstract String sql();

  @Override
  public void handleCommandComplete(int updated) {
    this.result = false;
    T result;
    int size;
    RowDescription desc;
    if (decoder != null) {
      result = decoder.complete();
      desc = decoder.description();
      size = decoder.size();
      decoder.reset();
    } else {
      result = emptyResult(collector);
      size = 0;
      desc = null;
    }
    resultHandler.handleResult(updated, size, desc, result);
  }

  @Override
  public void handleErrorResponse(ErrorResponse errorResponse) {
    failure = new PgException(errorResponse);
  }

  private static  T emptyResult(Collector collector) {
    return collector.finisher().apply(collector.supplier().get());
  }
}